BR102013008358B1 - Method for installing and cementing a liner in a well, Method for installing a liner in a well, return flow disperser and liner assembly - Google Patents

Description

Field of the Invention [001] The present invention relates to methods and tools for cementation. n-ners in oil and gas wells and, more particularly, methods and tools for suspending, sealing, and cementing liners in a single downhole descent.

Background of the Invention Hydrocarbons, such as oil and gas, can be recovered from various types of subsurface geological formations. The formations are typically formed by a porous layer, such as limestone and sand, overlapped by a non-porous layer. Hydrocarbons cannot pass through the non-porous layer, so the porous layer forms a reservoir where hydrocarbons can be collected. A well is drilled into the ground until the hydrocarbon-containing formation is reached. The hydrocarbons are then capable of flowing from the porous formation to the well.

In what may be the most basic of rotary drilling methods, a drill bit is attached to a series of tube sections called a drill string. The drill string is suspended from a drill tower and rotated by a motor in the drill tower. Drilling Fluid or Mud ”is pumped down the drilling column through the drill bit and then into the wellbore. This fluid is used to lubricate the drill bit and bring back the chips from the drilling process. As the drilling progresses downward, the drill string is lengthened by the addition of more pipe sections.

[OOSJWhen the drill bit reaches the desired depth, the larger diameter tubes, or liners, are positioned in the well and fixed cemented to prevent collapsing of the well sides. Cement is introduced through a working column. As they exit below the working column, the fluids already contained in the well, called 'returns', are displaced above the annular space between the casing and the well and are collected on the surface. .

When the lining is fixedly cemented, it is drilled at the level of the oil-containing formation so that the oil can penetrate the lined well. If necessary, various completion processes are performed to improve the flow of the formation oil. Drilling column is removed and replaced with a production column. Valves and other production equipment are installed in the well so that hydrocarbons can flow in a controlled manner from the formation to the well borehole and through the production column. to the surface for storage or transportation.

This simplified drilling process, however, is rarely possible in the real world. For a number of reasons, a modern oil well will not only have a surface-extended casing, but also one or more pipes, ie casings, of smaller diameter running through all or part of the casing. When these “coatings” do not extend all the way to the surface but are mounted on another coating, they are called “linersT”. Regardless of terminology, however, in essence the modern oil well typically includes several tubes wholly or partially within other tubes.

[008] Thus many wells are currently drilled in stages. An initial section is perforated, coated, and cemented. The drilling then proceeds and a liner descends into the uncoated portion of the well and installed. More specifically, the liner is suspended from the original liner by an anchor or "hanger". A seal is also typically established between the liner and the liner and, like the original liner, the liner is cemented into the well. This process can then be repeated to further extend the well and install additional liners.

Conventional liner anchors or "hangers" include various types of conventional sliding mechanisms that are attached to the liner. The wedges themselves typically are in the form of cones or shims with rough teeth or surfaces. An installation tool is used to securely position the anchor and handle the wedges from their initial non-seated position to a seated position where they are able to grip and engage the existing liner. The seating mechanisms are typically hydraulic, which are actuated by increasing the hydraulic pressure within the tool, or mechanical, which are actuated by turning, raising, or lowering the tool, or a combination of these mechanisms. These types of mechanical hangers typically require a separate annular gap or "shutter" space seal in order for the liner to be sealed to the liner.

[010] One approach that avoids the need for separate shutters and other problems inherent in mechanical suspensions has been the complete elimination of the anchor. That is, instead of using a separate anchor assembly, a portion of the liner itself is expanded in contact with an existing liner, making the liner essentially self-supporting and self-sealing. This type of expandable //, also commonly called expandable hangers and expandable liner hangers, are produced with metal sufficiently ductile to allow radial expansion of the liner, or more commonly, a portion of the liner in contact with the existing liner. Various mechanisms, hydraulic and mechanical, are used to expand the liner. All of these approaches, however, are based on the direct engagement of and sealing between the expanded liner and the existing liner.

For example, United States Patent 7,225,880 issued to B. Braddick discloses an expandable liner. The liner is seated on the liner acting as an expander that radially expands the upper portion of the liner to engage a liner. Once expanded, the expanded portion of the liner provides a seal that prevents fluid from flowing between the liner and the liner. The tubular expander is not removed from the liner after the expandable parts have expanded. It is designed to stay in the liner and provide radial support to the expanded liner.

United States Patent 7,387,169 issued to S. Harrell et al. also discloses various methods of suspending liners and lashing in production tubes by expanding a portion of the tubular, for example by means of a rotary expanding tool. The basis of all these methods is the creation of direct contact and seals between the expanded tubular portion and the existing liner.

[013] These approaches have an advantage over traditional mechanical suspensions. The outer surface of the liner shows no protruding parts and can generally be lowered into the existing duct more reliably than mechanical liner hangers. In addition, the expanded liner portion not only provides an anchor for the rest of the liner, but also creates a seal between the liner and the existing liner, thereby reducing the need for a separate plug. However, they have significant disadvantages.

First, as part of it must be expandable, the liner is necessarily made of relatively ductile metals. Such metals typically lower conventional limits of elasticity, which limits the weight volume and thereby the length of the liner that can be supported by the existing coating. Shorter liners in deeper wells may require the installation of more liner sections, thus significantly higher installation costs. This problem is only exacerbated by the fact that the expansion creates a fragile area between the expanded portion and the non-expanded portion of the liner. This fragile area is a potential fault area that may damage the integrity of the liner.

Secondly, it is generally necessary to expand the liner by a relatively long portion to generate the necessary hold on the existing liner. Because it is necessarily made of relatively ductile metal, once expanded, the liner portion tends to relax to a greater degree than if the liner were made of stiffer metal. This may be acceptable when the load to be supported is relatively small, such as a short section. However, it can be a significant limiting factor when the expanded liner portion is designed to support long and heavy liners.

[016] Thus, some approaches, such as the approach exemplified by Braddick 880, use expanders that are left on the liner to provide radial support to the expanded portion of the liner. These designs do provide some benefits, but the length of the liner that is to be expanded can still be substantial, especially as the weight of the liner column is increased. As the length of the area to be expanded increases, so do the forces required to complete the expansion. Thus, there is a progressive increase in friction between the expander tool and the liner being expanded, and more seating forces are required to overcome the increasing friction. The need for higher seating forces over longer runs can also increase the chances of failure in complete liner seating.

[017] In addition, the liner must necessarily have an outside diameter smaller than the inside diameter of the liner in which it will be inserted. This clearance, especially for deep wells where a series of progressively smaller liners will be suspended, is preferably as small as possible to allow the largest inner diameter of the liner. However, if the tool has to be safely passed through the existing coating, that clearance is still relatively large and therefore the liner portion is expanded to a significant degree.

[018] Thus, it may not be possible to fabricate using more corrosion resistant alloys. Such alloys typically are stiffer and less ductile. In general, they cannot be expanded, or expanded only if a much higher force is used to a sufficient degree to close the gap and secure the existing covering.

[019] In addition to, and partly due to these drawbacks, expandable liners also create compensations in liner cementation. Because they establish a seal between the liner and the existing liner, once the expandable liner is fully seated, the fluids shifted above the annular space as the cement is injected, the so-called “returns” can no longer flow around the liner. liner on its path to the surface. Thus, some expandable liners, such as the liners revealed in Braddick 880, do not settle only after the cementation has been completed.

[020] Other expandable liners partially expand the liner allowing vertical return flow paths between the liner and the liner. For example, United States Patent 7,441,606 issued to P. Maguire, United States Patent 7,048,065 issued to R. Badrak et al., And United States Patent 6,598,677 issued to J. Baugh disclose expandable liners. which are expanded in two stages. In the first stage, the liner is partially expanded by engaging the liner wall, but does not completely seal the annular space space around the liner. Vertical flow paths remain to allow the return of a cementing operation to flow around the liner to the above liner. After the cementation is completed, the liner is fully expanded around its entire circumference and the seal of the separate annular space is seated.

[021] Other expandable liners, such as liners disclosed in Baugh 677, are partially expanded to create an initial seal prior to cementation. A return path is created by providing an expandable liner port and passageways through the mold that is used to expand the liner. The mold remains engaged in the liner, and the returns that access the liner through the gate flow through the passages in the mold. When the cementing operation is completed, the mold is actuated to complete the expansion of the liner, including the area around the door, sealing the door.

[022] Baugh ‘677 also reveals a similar hanger where instead of sealing the door by expanding the liner around it, a sliding cover is fitted on the outside of the liner. The cover is actuated to close the door after the cementation has been completed, but there is no description of any mechanism or method of this procedure. Under all circumstances, the mold remains engaged in the liner and is only removed after the cementation is completed and the door closed.

[023] All of these approaches have a common disability. That is, the mold or other mechanisms that expand the liner and seat and seal the hanger are not disengaged before cementation is completed. Under most circumstances, laying and sealing of the liner is also not completed before the liner is cemented. Cementing the liner prior to its full settlement, however, includes several problems. More significantly, it means that the liner will be fixedly cemented before an operator becomes aware that the seating mechanism has operated correctly, that an effective seal has been established with the existing liner, and that he is able to recover the tools used for install the liner. Any difficulties in these operations will usually be more easily overcome if the liner has not been cemented.

Moreover, even when a seal can be established, the manner in which flow paths for returns on conventional expandable liners are established is still highly unsatisfactory. Fabrication and assembly of the installation tool is unnecessarily complicated by the need to provide passages in the mold or other tool components. In addition, as they are made from relatively ductile metals, expandable liners already exhibit various points of weakness and several potential failure areas as discussed above. Providing ports through the expandable liner exacerbates this problem.

[025] Another reality that the oil and gas industry faces is that most well-known shallow depth reservoirs have been drilled and are rapidly being depleted. Thus, there is a growing need to drill deeper and deeper wells for access to new reserves. Many operations, such as installing a liner, can be practiced with some degree of error at relatively shallow depths. Similarly, the cost of equipment failure is relatively low when the equipment is only a few thousand feet from the surface.

[026] When the well is designed to depths of 40,000 feet or even deeper, these failures can be costly in terms of time and cost. Aside from monetary equipment expenses, operating costs for modern offshore rigs can be $ 500,000 or more per day. There is still some irony in the fact that failures are not only more costly under deep conditions, but avoiding those failures is also more difficult. Temperature and pressure conditions at great depths can be extreme, thus combining the issue of design and construction of tools that can be installed and will function safely and predictably.

[027] The progressive depth of oil wells also means that the carrying capacity of a connection between an existing liner and a liner, achieved either by mechanical liner hangers or expanded liners, is increasingly important. Higher load capacities may mean that the same depth can be reached with fewer liners. Since the operating costs of descending a drill rig can be very high, significant cost savings can be obtained if the time spent in descending an additional liner can be avoided.

[028] The increasing operating costs of drilling rigs also make it increasingly important to combine operations as a way to reduce the number of inlet and outlet wells. For example, especially in deep wells, significant savings can be achieved by drilling and simultaneously coating a new section of the well. Thus, liner nesting tools have been designed that will transmit torque from a working column to a liner. A drill bit is fixed to the end of the liner, and the liner is rotated.

These and other disadvantages inherent in the prior art are addressed by the present invention, which will be discussed below in the detail description and the accompanying drawings.

Summary of the Invention The present invention provides novel hydraulic actuators and hydraulic seating assemblies that can be used in subsurface oil and gas well tools. Unpublished hydraulic actuators include a cylindrical mandrel and a stationary sealing member annular space connected to the mandrel. A hydraulic cylinder is slidably supported by the mandrel and the stationary sealing member and is removably fixed in position over the mandrel. The stationary sealing member divides the interior of the cylinder into a lower hydraulic chamber and an upper hydraulic chamber. An inlet port provides fluid communication with the lower hydraulic chamber, and an outlet port provides fluid communication with the upper hydraulic chamber.

[031] Unpublished actuators also include a balancing piston. The balancing piston is slidably supported within the upper hydraulic chamber of the actuator, preferably over the mandrel. The balancing piston includes an axially extended passage through the balancing piston. Fluid communication through the piston and between its upper and lower faces is controlled by a normally closed valve in the passage. Thus, in the absence of relative movement between the mandrel and cylinder, the balancing piston may slide in response to a hydrostatic pressure difference between the outlet port, which is on one side of the balancing piston, and the portion of the balancing piston. upper hydraulic chamber that is on the lower face of the balancing piston. Unpublished actuators, therefore, are less susceptible to damage caused by hydrostatic pressure differences inside and outside the actuator. In addition, the unbalanced actuator balancing piston can prevent debris from entering the actuator.

[032] The normally closed valve on unpublished actuators is preferably a violable diaphragm. Other preferred embodiments include a pressure release device that allows controlled release of pressure from the upper hydraulic cylinder.

In other aspects, the present invention provides anchor assemblies designed for installation within an existing duct. Unpublished anchor assemblies comprise a non-deformable mandrel, an expandable metal sleeve, and a mold. The expandable metal sleeve is carried on the outer surface of the mandrel. The mold is supported for axial movement on the outer surface of the mandrel from a first position axially proximal to the sleeve to a second position under the sleeve. Movement of the mold from the first position to the second position expands the sleeve radially outward in contact with the existing duct.

Preferably, the mold of the unpublished anchor assemblies has an inside diameter substantially equal to the outside diameter of the mandrel and an outside diameter larger than the inside diameter of the expandable metal sleeve. The mandrel of the unpublished anchor assemblies is preferably manufactured using high performance alloys and most preferably corrosion resistant high yield alloys.

Unpublished anchor assemblies preferably have a minimum load capacity of 45,359 kg (100,000 lbs), more preferably a minimum load capacity of 113,398 kg (250,000 lbs), and most preferably a minimum load capacity of 226,796 kg. (500,000 lbs). Said anchors are then capable of supporting the weight of liners and other heavy relative subsurface tools and well components.

[036] Unpublished anchor assemblies are designed for use in combination with a tool to install the anchor in a tubular duct. The anchor assembly and the tool comprises the anchor assembly, a descent assembly, and a seating assembly. The lowering assembly removably engages the anchor assembly. The seating assembly is attached to the lowering assembly and engages the mold and moves the mold from its first position to its second position.

As will be apparent from the following detailed description, once the sleeve has been expanded, the mandrel and mold provide radial support for the sleeve, thereby increasing the carrying capacity of the unusual anchors. Conversely, by increasing the radial support for the sleeve, unusual anchors can achieve equivalent load capacities with a shorter sleeve compared to expandable liners, which reduces the amount of force required to seat unusual anchors. In addition, unlike expandable liners, the mandrel of unpublished anchor assemblies is substantially non-deformable and can be produced using more corrosion-resistant, stiffer and more robust metals.

In still further aspects, the invention in question provides novel gear mechanisms which can be, and preferably are, used in the chuck of unpublished anchor and tool assemblies and in other sectioned ducts and shafts used for torque transmission. They comprise shaft sections with end threads for joining and prismatic outer surfaces adjacent to their threaded terminals. A threaded connector connects the threaded terminals of the shaft sections. The connector has axial grooves. A pair of gear rings are slidably supported on the prismatic outer surfaces of the shaft sections. Gear rings have prismatic inner surfaces that engage the prismatic outer surfaces of the shaft sections and axial grooves that engage the axial grooves over the threaded connector. Preferably, unpublished gear mechanisms also comprise recesses adjacent to compatible prismatic surfaces that allow limited rotation of the gear rings in prismatic shaft sections to facilitate engagement and disengagement of compatible prismatic surfaces. Thus, as will be apparent from the following detailed description, unpublished gear mechanisms provide reliable transmission of large volumes of torque through sectioned ducts and other drive shafts without damaging threaded connections.

[039] Other aspects of the present invention provide novel methods of installing and cementing a liner in a well, unpublished flow dispersers, and unpublished liner assemblies. This mode provides a method for installing and cementing a liner in a well. The method comprises lowering the liner into the well in a working column, anchoring the liner in an existing casing in the well, and sealing the liner to the existing casing. The seal substantially prevents direct flow of fluid around the liner to the existing liner from the annular space between the liner and the well. The liner is then released from the working column and the working column lifted to provide a flow path within the liner. The cement is injected into the liner and flows freely into the annular space space. Fluid displaced from the annular space by the cement is returned through a door in the liner, the door being disposed at the subsurface of the seal, and through the flow path established by the release of the liner and the lifting of the work column. The working column is then pulled out of the well.

[040] Other modalities provide methods for installing and cementing a liner in a well, with a liner assembly going down to the well. The liner assembly comprises a tubular liner and an anchor connected to the liner. The anchor is in an unsettled position in which fluid can flow around the liner assembly in the annular space between the liner assembly and the well. The liner assembly further comprises an installation tool that removably engages the anchor, a return flow spreader connected to the liner below the anchor and which has a port allowing fluid communication of annular space to the flow spreader, and a tubular duct extended through the anchor, the installation tool, and the flow spreader and up to the liner.

[041] The installation tool is actuated to seat the anchor to secure and seal the liner in an existing well casing and thereby substantially prevent direct flow of fluid around the liner assembly from the annular space space to the existing casing . The installation tool is then disengaged and lifted from the anchor to provide a pathway for fluid flow through the anchor and around the duct and cement is injected through the duct into the liner and annular space space. The fluid displaced by the cement flows freely from the annular space to the existing liner through the spreader door and the pathway provided by disengaging and lifting the installation tool.

Additional aspects of the invention provide methods for installing a liner in a well comprising lowering a liner assembly into the well. The liner assembly comprises a tubular liner and an anchor connected to the liner, the anchor being in an unsettled position in which fluid can flow around the liner assembly in the annular space space between the liner assembly and the well. The liner assembly further comprises an installation tool that removably engages the anchor, a return flow spreader connected to the liner below the anchor and which has a port allowing fluid communication from the annular space to the flow spreader, a tubular duct extended through the anchor, installation tool, and flow spreader to the liner, and a one-way seal mounted between the tubular duct and the liner or flow spreader above the flow spreader port. One-way sealing allows fluid to flow up through the one-way seal and prevents fluid from flowing down after sealing in a single direction.

[043] The installation tool is actuated to seat the anchor, the anchor securing and sealing the liner in an existing well casing and thereby substantially preventing direct flow of fluid around the liner assembly from the annular space to the existing coating. The seal established by the anchor seat is then pressure tested.

Other embodiments provide a return flow disperser adapted to allow return flow during cementation of a well liner. The return flow spreader comprises a cylindrical body adapted for installation in a well as part of the liner. The cylindrical body contains a fluid port adapted to allow fluids displaced by a cementing operation to flow from an annular space between the liner and the well to the cylindrical body. The return flow spreader further comprises a cover supported on the cylindrical body for movement from an open position, where the door is open, to a closed position, where the door is closed by the cover, a transmission disposed within the cylindrical body and defining a cylindrical passageway adapted to accommodate a tubular duct. The tubular duct is adapted to extend through the cylindrical body and inject cement into the liner below the body and the transmission is removably connected to the cover and operable to move the cover from the open to the closed position. Other aspects of the invention provide novel liner assemblies comprising such return flow dispersers and additionally comprising an anchor adapted to secure the liner assembly to the well and having an unsettled position in which fluid may flow around the liner assembly when the liner assembly is lowered into the well, and an installation tool that removes the anchor removably and is adapted to seat the anchor in an existing well casing.

Additional embodiments of the invention provide a liner assembly that allows back flow during cementation of the liner assembly in a well. The liner assembly comprises an anchor adapted to secure and seal the liner assembly in the well. The anchor comprises a non-deformable cylindrical mandrel, an expandable metal sleeve carried on the outer surface of the mandrel, and a cylindrical mold supported for axial movement on the outer surface of the mandrel from a first position axially proximal to the sleeve to a second position under the sleeve; wherein the movement of the mold expands the sleeve radially outwardly and anchors and seals the liner assembly to a casing in the well. The liner assembly further comprises an installation tool that removably engages the anchor and which is adapted to actuate the mold and a flow dispersing tool. The flow dispersion tool has a cylindrical body defining a port adapted to allow fluids displaced by a cementing operation to flow from an annular space between the liner and the well to the tool, a body-mounted cover, the cover being movable from an open position, where the door is open, to a closed position, where the door is closed, and a transmission operable to move the cover from the open position to the closed position.

These and other aspects of the invention, as well as the resulting advantages, are described more fully below.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1A is a perspective view of a preferred embodiment 1 of the liner assemblies of the present invention, including preferred embodiment 2 of unpublished liners attached to preferred embodiment 3 of unusual anchor installation tools. liner assembly 1 being in depth into an existing liner 6 (shown in cross section);

[048] Figure 1B is a perspective view similar to Figure 1A showing preferred liner 2 of the present invention after being seated on liner 6 by anchor installation tool 3 and installation tool 3 has been recovered from liner 6;

[049] Figure 2A is a sectional view of a generally enlarged fourth portion corresponding to section A of the liner assembly 1 shown in Figure 1A showing details of a preferred embodiment 13 of the seating assemblies of the present invention showing the power tool. settlement 13 in its downward position;

[050] Figure 2B is a fourth part view similar to Figure 2A showing the laying tool 13 in its seated position;

[051] Figure 3A is a sectional view of a generally enlarged fourth part corresponding to section B of liner assembly 1 shown in Figure 1A showing additional details of seating tool 13 and parts of liner hanger 11 in position of descent;

Figure 3B is a view similar to Figure 3A showing laying tool 13 and liner hanger 11 in their seated position;

[053] Figure 4A is a sectional view of a generally enlarged fourth portion corresponding to section C of liner assembly 1 shown in Figure 1A showing further details of seating tool 13 and parts of liner hanger 11 in position. of descent;

Figure 4B is a view similar to Figure 4A showing laying tool 13 and liner hanger 11 in their seated position;

[055] Figure 5A is a sectional view of a generally enlarged fourth portion corresponding to section D of liner assembly 1 shown in Figure 1A showing additional details of seating tool 13 and parts of liner hanger 11 in position. of descent;

[056] Figure 5Β is a view similar to Figure 5A showing laying tool 13 and liner hanger 11 in their seated position;

[057] Figure 6A is a sectional view of a generally enlarged fourth portion corresponding to section E of the liner assembly 1 shown in Figure 1A showing details of a preferred embodiment of the descent assemblies of the present invention showing the lowering 12 and the liner hanger 11 in its lowering position;

[058] Figure 6B is a view similar to Figure 6A showing the lowering tool 12 and liner hanger 11 in their seated position;

[059] Figure 6C is a view similar to Figures 6A and 6B showing the lowering tool 12 and liner hanger 11 in their released position;

[060] Figure 7A is a sectional view of a generally enlarged fourth portion corresponding to section F of liner assembly 1 shown in Figure 1A showing additional details of liner hanger 11 and lowering tool 12 in their position. descent;

[061] Figure 7B is a view similar to Figure 7A showing liner hanger 11 and lowering tool 12 in their seated position;

[062] Figure 7C is a view similar to Figures 7A and 7B showing the // ner hanger 11 and the lowering tool 12 in their released position;

[063] Figure 7D is a view similar to Figures 7A to 7C showing liner hanger 11 and lowering tool 12 in a partially withdrawn position;

[064] Figure 8A is a partial cross-sectional view of a fourth part of a tool chuck 30 of installation tool 3 shown in Figure 1A (the portion generally located in section A of Figure 1A) showing the details of a preferred embodiment. 32 of the novel gear mechanisms of the present invention;

[065] Figure 8B is a view similar to Figure 7A showing connector assembly 32 in a decoupled position;

[066] Figure 9A is a sectional view taken along line 9A-9A of Figure 8A of connector assembly 32;

[067] Figure 9B is a view similar to Figure 8A taken along line 9B-9B of Figure 8B showing connector assembly 32 in a decoupled position.

[068] Figure 10A is a sectional view of a fourth enlarged portion of a preferred embodiment 10 of the return flow dispersers of the present invention incorporated into the preferred liner assembly 1 shown in Figure 1A showing ports 83 and others. details of the flow disperser 10 in its downward position;

[069] Figure 10B is a view similar to Figure 10A showing the flow spreader 10 in which the doors 83 were closed;

[070] Figure 11A is a cross-sectional view of a fourth part of a second preferred embodiment 110 of the return flow dispersers of the present invention showing ports 183 and other details of flow disperser 110 in their downward position;

[071] Figure 11B is a view similar to Figure 11A showing the flow spreader 110 in which the doors 183 were closed;

Figure 12A is a cross-sectional view of a fourth part of a preferred third embodiment 210 of the return flow dispersers of the present invention showing ports 283 and other details of flow disperser 210 in their downward position;

Figure 12B is a view similar to Figure 12A showing the flow spreader 210 in which the doors 283 were closed;

Figure 13A is a cross-sectional view of a fourth part of a fourth preferred embodiment 310 of the return flow dispersers of the present invention showing ports 383 and other details of flow disperser 310 in their downward position;

[075] Figure 13B is a view similar to Figure 13A showing the flow spreader 310 in which doors 383 were closed;

[076] Figure 14A is a cross-sectional view of a fourth part of a fifth preferred embodiment 410 of the return flow dispersers of the present invention showing ports 483 and other details of flow disperser 410 in their downward position; and [077] Figure 14B is a view similar to Figure 14A showing the flow spreader 410 in which doors 483 were closed.

It will be interesting to those skilled in the art to realize that line breaks along the vertical length of the tool can eliminate perfectly known structural components or interconnecting members, and consequently, the effective length of the structural components is not represented.

[079] Description of Illustrative Modalities [080] The liner assemblies of the present invention may be used to install unpublished liners within an existing duct. They generally comprise tubular liners, an anchor connected to tubular liners, an installation tool that removably engages the anchor, and a return flow spreader. Other embodiments comprise a tubular duct extended through the anchor, installation tool, and flow disperser, unusual anchors, and unprecedented return flow dispersers.

[081] The unprecedented methods of installing and cementing liners in a well generally comprise descending a liner into the well in a working column. The liner is anchored and sealed to an existing casing in the well. The liner is then released, and the work column is lifted to provide a flow path within the liner. The cement is injected into the liner and flows freely into the annular space between the liner and the well. Because the liner has been sealed to the existing liner, fluid displaced from the annular space by the cement space is substantially prevented from flowing around the liner into the existing liner. Thus, the return fluids flow freely through a port on the liner and the fluid pathway that was formed by the release of the liner and the lifting of the work column. After injecting the desired amount of cement into the annular space, the working column is removed from the well.

[082] Other unpublished methods of liner installation and cementation generally include the descent of a liner assembly into the well. The liner assembly comprises tubular liners and an anchor. The anchor is in a non-seated position where fluid can flow around the liner assembly. The liner assembly further comprises an installation tool that removably engages the anchor and a return flow disperser connected to the liner below the anchor. The return flow spreader has a port allowing fluid communication from the annular space space between the liner and the well into the spreader. The liner assembly further comprises a tubular duct extending through the anchor, installation tool, and flow spreader to the liner.

[083] When the liner assembly descends into the well, the installation tool is actuated to seat the anchor, which in turn secures and seals the liner to an existing well casing. Once the anchor is seated and the seal is established, fluid is substantially prevented from flowing directly around the liner assembly from the annular space space under the anchor to the liner above the anchor. The installation tool is then disengaged and lifted from the anchor to provide a path for fluid flow through the anchor and around the duct. When the installation tool is disengaged, the cement is injected through the duct into the liner and the annular space space. The well fluid displaced by the cement is then able to flow from the annular space to the existing liner through the spreader door and the path formed by disengaging and lifting the installation tool.

The anchors of the present invention are designed for installation within an existing duct. They comprise a non-deformable mandrel, an expandable metal sleeve, and a mold. The expandable metal sleeve is carried on the outer surface of the mandrel. The mold is supported for axial movement on the outer surface of the mandrel from a first position axially proximal to the sleeve to a second position under the sleeve. Movement of the mold from the first position to the second position expands the sleeve radially outwards making contact with the existing duct.

[085] Unusual anchors are designed for use in combination with a tool to install the anchor in a tubular duct. The installation tool comprises a lowering assembly and a seating assembly. The descent assembly engages the anchor removably. The seating assembly attaches to the lowering assembly and engages the mold, moving it from its first position to its second position.

[086] The installation and anchor tool set, collectively called the liner hanger tool, is used, for example, to drill oil and gas wells and to install liners and other well components. The assembly is connected to a working column, preferably as part of a liner assembly, which can be lifted, lowered, and rotated as desired from the well surface. A liner or other well component can be attached to the liner hanger tool. If a liner is attached, the liner preferably includes a port allowing the return fluids from the cementing operations to access the liner. Most preferably, the liner assembly comprises an unprecedented return flow disperser.

[087] The liner assembly is then lowered into the well through an existing duct to position the anchor to the desired depth. When the anchor is positioned, the mold is moved axially on the outer surface of the mandrel by a seating assembly. More particularly, the mold is moved from a position proximal to the expandable metal glove to a position under the glove thereby expanding the glove radially outwardly in contact with the existing duct. Once the metal sleeve has been expanded, the tool is manipulated to release the lower set from the anchor set. Preferably, as described below, the anchor is set and released prior to cementing the liner in the well. In any event, the descent and settlement assemblies are finally recovered from the duct to complete the installation of the liner or other well component.

For example, Figure 1A shows a preferred liner assembly 1 of the present invention. The liner assembly 1 includes a preferred embodiment 11 of the unpublished liner hangers that is attached to an installation tool 3. The tool 3 is attached at its upper end to a work column 5 mounted using multiple lengths of threaded tubular sections together. through connectors. Work column 5 can be lifted, lowered, and rotated as necessary to transport the liner assembly 1 through an existing casing 6 cemented into a well along the ground 7. Work column 5 is also used to pump the fluid into liner assembly 1 and manipulate assembly as needed to seat suspender 11.

Preferred liner assembly 1 also includes a liner 2 which is attached to the lower end of the hanger 11.0 liner 2 is mounted primarily using multiple lengths of tubular sections, such as tubular liner 8, threaded together by means of connectors. The liner assembly 1, while being lowered into the well, will typically still have several additional tools and components, such as the need to perform various operations in the well before and after setting the hanger 11.

For example, liner 2 will be fixedly cemented and therefore the liner assembly 1 incorporates various tools and components used to perform cementation operations, such as a preferred embodiment 10 of the return flow dispersers of the present invention. , cement padding 14, a smooth gasket 15, and a liner rubber plug (not shown). The operation of the installation tool 3, as discussed in detail below, is performed in part by increasing the hydraulic pressure within the tool 3. Thus, the liner assembly 1 preferably further incorporates a mechanism to allow the pressure to be formed in the column. work 5, as a sphere seat (not shown) upon which a sphere may fall. Importantly, the liner assembly 1 may further include a drill bit (not shown) so that the well may be drilled and extended while the liner assembly 1 is lowered through the existing liner 6.

It is understood that references to a liner assembly include the entire set of tools and tubulars that are introduced into the well in a working column and manipulated to install the liner. In this context, references to liner 2 or a liner generally refer to tubular liners, such as tubular 8, which make up the important portion of their length and may include, in context, other unnamed components. On the other hand, it is interesting that when a liner is installed many, but not all tools and components used to install the liner are extracted from the well or drilled through the well. For example, installation tool 3 will be completely pulled from the well at some point after anchor 11 has been set. Other tools or tool parts, however, such as liner hanger 11, remain in the well and form part of the duct that constitutes and is mentioned in this sense as the liner. Thus, references to liner 2 or an installed liner generally include not only tubular liners, but also those tools or components of a liner assembly that remain in the well after completion of the operations described herein and form part of the liner duct as a all. While a degree of inaccuracy is inevitable, it is believed that those skilled in the basic technique will immediately understand these references in the context in which they are used.

[092] Suspension Assembly [093] Suspension 11 includes a suspender mandrel 20, a mold 21, and a metal sleeve 22. Liner 2 is attached to the lower end of suspender 11, more specifically to the suspender mandrel 20.

However, it would be interesting that while its design and operation are described with reference to the liner assembly 1, the anchors and installation tools of the present invention are not limited in their application to any toner assemblies or a specific triner. Unusual anchors can be used to install a variety of toners, and generally can be used to install any other tools or downhole components that require anchoring within the duct, such as dispersion wedges, shutters, mechanical plugs, Cement plugs, perforation plugs, grooved barrel, and polished access receptacles (PBRs). Similarly, although the Preferred Toner Assembly 1 is exemplified by showing a suspended toner tensioned from the suspender 11, unusual anchors can also be used to hold toners or other well components extended above the anchor, or secure these components in resistance to torsional forces.

[095] In addition, as used in the industry, a "sheath" is generally considered to be a tubular pipe that lines a wellbore and extends from the well surface. Likewise, a "toner in general" is considered to be a tubular duct lining a well bore not extending from the well surface, but is instead held within an existing coating or other toner. In the context of the present invention, however, 'lining' is understood to refer to any duct in the well in which the anchor assembly will be installed, whether or not extending to the surface, and “toner” refers to a duct that has an outside diameter smaller than the inside diameter of the casing in which the anchor is installed, [096] Even more broadly, it would be interesting for unusual tools to be exemplified in the context of casings and toners used for drilling oil and gas wells. however, it is not limited to this aspect in its application. Unusual anchors and tools can be advantageously used in other ducts where it is necessary to install an anchor by operating a tool through an existing duct to install other smaller ducts or tools.

[097] Also, it is interesting that the figures and description refer to the toner assembly 1 as being in vertical orientation. Modern wells, however, are often not drilled vertically and, in fact, can extend horizontally across the ground. New tool sets, anchors, and toner can also be used in horizontal wells. Thus, references to the terms up, down, up, down, up, down, top, bottom, and the like will be understood as relative terms in this context.

[098] In Figure 1A, toner assembly 1 is shown in its "down" position. That is, it has been lowered into the existing casing 6 to the depth at which the hanger 11 will be installed. The hanger 11 has not yet been "seated" on casing 6, ie it has not been installed. Figure 1B shows the toner 2 after installation, ie after the hanger 11 was seated on casing 6 and a lowering tool 12 (not shown) and the laying tool 13 was recovered from the well. It is noted by comparing the two figures that the hanger mandrel 20 remained substantially in the same position with respect to the liner 6, that the mold 21 followed a downward path approximately the length of the glove 22, and that the glove 22 was radially outwardly expanded. contact with coating 6.

Complementary details concerning the liner hanger 11 can be seen in Figures 7, which show the liner hanger 11 and various components of the lowering tool 12. Figure 7A shows the hanger 11 in its "down" position; Figure 7B shows the hanger 11 after its “seating”, Figure 7C shows the hanger 11 after “released” from the descent tool 12, and Figure 7D shows the hanger 11 after the descent tool 12 has been partially removed from the hanger 11

From this it can be seen that the hanger mandrel 20 is a generally cylindrical body providing a duct. It provides a connection at its lower end, for example, to a liner column (such as liner 2 shown in Figure 1) through threaded connectors or other conventional connectors. Other liners, such as a patch liner, and other types of well components or tools, such as a spreading wedge, however, can be connected to mandrel 20 directly or indirectly. Thus, although described herein as part of the liner hanger 11, it can also be viewed as the uppermost component of the liner or other component of the well being installed. As will be described in more detail below, the mandrel 20 is also removably engaged with the lowering tool 12.

As can be seen from Figure 7A, in the downward position the upper portion of the mandrel 20 provides an outer surface on which the mold 21 and the expandable metal sleeve 22 are carried. The mold 21 and the expandable metal sleeve 22, like the mandrel 20, they are also generally cylindrical bodies.

The mold 21 is supported for axial movement on the outer surface of the mandrel 20. In the downward position, it is proximal to the expandable metal sleeve 22, i.e. it is generally axially removed from the sleeve 22 and has not been moved to a position for expand sleeve 22 in contact with an existing liner. In theory the mold may be slightly spaced, but preferably, as shown in Figure 7A, the mold 21 is adjacent to the metal glove 22. The glove 22 is also carried on the outer surface of the mandrel 20. Preferably, the glove 22 is prevented from moving upward about mandrel 20 by mold 21 as shown and prevented from moving downwardly by its shoulder engagement with annular space 23 over mandrel 20. However, such containment may occur by means of other stops, pins, keys, set screws and other elements known in the art.

Comparing Figure 7A and Figure 7B, it can be seen that the hanger 11 is seated by actuation of the mold 21 as will be described in more detail below. When actuated, the mold 21 moves on the outer surface of the mandrel 20 from its downward position, where it is proximal to the sleeve 22, to its seated position, where it is under the sleeve 22. This downward movement of the mold 21 causes metal sleeve 22 expands radially in contact with an existing liner, such as liner 6 shown in Figure 1 and Figure 7D.

Movement of the mold 21 under the sleeve 22 is preferably facilitated by tapering the lower end of the mold 21 and the upper end of the sleeve 22, as shown in Figure 7A. Preferably, the opposite surfaces of the mandrel 20, mold 21, and sleeve 22 are also polished and smoothed and / or are provided with various structures that facilitate movement of the mold 21 and provide seals therebetween. For example, the outer surface of the mandrel 20 and the inner surface of the sleeve 22 are provided with annular space space protrusions in the areas denoted by the numeral reference 24. These protrusions not only reduce friction between opposing surfaces while mold 21 is being moved, but when the mold 21 has positioned under the sleeve 22, although substantially compressed and / or deformed, they also provide metal-to-metal seals between the mandrel 20, the mold 21, and the sleeve 22. It is noted, however, that annular space protrusions may be provided on the inner and outer surface of the mold 21, or on a mold surface 21 rather than protrusions in the mandrel 20 or sleeve 22. Covers may also be applied to opposite surfaces to reduce the degree of friction of movement resistance of mold 21 or to accelerate sealing between opposing surfaces.

The outer surface of the mold 21, or more precisely, the portion of the outer surface of the mold 21 that will move under the sleeve 22, is preferably polished and smoothed to reduce friction therebetween. Likewise, the inner surface of the mold 21 is preferably smoothed and polished to reduce friction with the mandrel 20. In addition, when the hanger 11 is installed in an existing casing, the upper portion of the mold 21 may provide a polished access receptacle in the housing. which other well components can be installed.

Preferably, the unpublished anchor assemblies further include a ratchet mechanism that engages the mandrel and mold and resists reverse mold movement, i.e. movement of the mold back to its first position, in which it is axially proximal. to the glove, and away from its second position, where it is under the glove. The liner hanger 11, for example, is provided with a ratchet ring 26 mounted between the mandrel 20 and the mold 21. The ratchet ring 26 has claws that normally engage corresponding retentions in the annular space recesses, respectively, on the surface. outside of the mandrel 20 and on the inner surface of the mold 21. The ratchet ring 26 is a split ring allowing to compress circumferentially by pressing the jaws and allowing it to pass under the retentions in the mold 21 as the mold 21 travels downwardly expanding the sleeve 22. However, the jaws in the ring 26 are forced to engage the retainers if the mold 21 follows any upward path. Thus, once seated, the relative movement between the mandrel 20, the mold 21, and the sleeve 22 is resisted by the ratchet ring 26 on the one hand and the shoulder of the mandrel 23 on the other hand.

[0107] From the above exposure, it is interesting to note that in unpublished anchor assemblies, or at least in the mold path area, the effective outside diameter of the mandrel and the effective inside diameter of the mold are substantially equal, while the effective diameter outside of the mold is larger than the effective inner diameter of the sleeve. Thus, for example, and as can be seen in Figure 7B, the mold 21 acts to radially expand the sleeve 22 and when the sleeve 22 is expanded, the mandrel 20 and the mold 21 are concentric and provide radial support for sleeve 22, thereby increasing the load capacity of the suspension 11. Conversely, by increasing the radial lift for the sleeve 22, the suspension 11 can achieve equivalent loading capacities with a shorter sleeve 22, which reduces the amount of force required for the sleeve. seat the suspension 11.

By effective diameter is meant a reference to the profile of the part as viewed axially along the pathway of the mold path 21. In other words, the effective diameter takes into account any protruding structures, such as annular space-space protrusions. project from the nominal surface of a part. Similarly, when projections, such as annular space protrusions, are provided on mandrel 20 or mold 21, the outer diameter of mandrel 20 will be slightly larger than the inner diameter of mold 21 so that a seal can be created therebetween. . "Substantially equal" is intended to understand such variations, and other normal tolerances in tools of this type.

Furthermore, since the hanger mandrel 20, in one aspect, is the uppermost component of liner 2 to be installed, it is interesting that its inner diameter preferably be at most the inner diameter of liner 2 to be installed. Thus, any additional constriction of the pipeline being installed in the well will be avoided. More preferably, however, it is substantially equal to the inner diameter of liner 2 so that the mandrel 20 can be as thick as possible.

[0110] Furthermore, it is interesting that the mandrel of unpublished anchor assemblies is substantially non-deformable, that is, it resists significant deformation when the mold is moved on its outer surface to expand the metal sleeve. Thus, sleeve expansion is facilitated and the mandrel is capable of providing significant radial support to the expanded sleeve. It is expected that a certain degree of compression can be tolerated to approximately one percent, but generally the compression is kept to a minimum to maximize the degree of radial lift provided. Thus, the unusual anchor mandrel is preferably made from relatively rigid ferrous and non-ferrous metal alloys and most preferably from corrosion resistant metal alloys. Suitable ferrous alloys include nickel chromium molybdenum steel and other high performance steel. Non-ferrous alloys include nickel, iron or cobalt superalloys, such as Inconel, Hastelloy, Waspaloy, Rene, and Monel alloys. Superalloys are corrosion resistant, meaning they are more resistant to the chemical, thermal, pressure and other corrosive conditions commonly encountered in oil and gas wells. Thus superalloys or other corrosion resistant alloys may be preferable when anchor corrosion is a possible problem.

The mold of the unusual anchors is also preferably made of such materials. Utilizing such high performance alloys, not only facilitated sleeve expansion, such as the mandrel and die can also provide significant radial support for the expanded sleeve and the die also become more corrosion resistant.

On the other hand, the sleeve of the unpublished anchor assemblies is preferably made from ductile metal, such as ferrous and nonferrous ductile metal alloys. The alloys must be ductile enough to allow expansion of the glove without creating cracks. Examples of such alloys include aluminum, brass, bronze, stainless steel, and ductile carbon steel. Preferably, the metal has an elongation factor of approximately 3 to 4 times the anticipated expansion for the glove. For example, if the glove is to expand by 3%, it will be fabricated using a metal with an elongation factor of about 9 to about 12%. In general, therefore, the material used for glove manufacturing should have an elongation factor of at least 10%, preferably from about 10 to about 20%. At the same time, however, the glove should not be manufactured using such a ductile material as to prevent retention in the existing coating.

Also, it is interesting that the choice of materials for the mandrel, mold, and sleeve must be coordinated to provide minimal mandrel deformation while allowing the sleeve to expand through the mold without producing cracks. As higher yielding materials are used in the mandrel and mold, it is possible to use progressively less ductile materials in the sleeve. Less ductile materials may give the glove greater grip, but of course will require more expressive expansion forces.

In the relevant aspect, however, by using an expandable and ductile metal seal and a non-deformable mandrel, it is possible to provide a firm and reliable seal with an existing coating while avoiding the complexities of other mechanical suspensions and significant disadvantages of expandable liners. More specifically, unpublished suspensions do not have a fragile area such as that existing at the junction of the expanded and unexpanded portion of the expandable liners. Thus, with the other factors in equivalence, unprecedented suspenders can achieve higher load capacities.

In addition, expandable liners should be produced with relative thickness, in part to compensate for the fragile area created between the expanded part and the unexpanded part. The expandable gloves of the unprecedented hangers, however, are much thinner. Thus, with the other factors in equivalence, expandable sleeves can be more easily expanded, which in turn reduces the amount of force that needs to be generated by the seating assembly.

Ductile alloys, from which conventional expandable liners can be produced, and the unprecedented expander sleeves expandable once expanded, can relax and cause a reduction in radial force applied to an existing coating. Conventional tools provide support for parts of the expanded liner leaving the mold or other expansion member in the well. The non-deformable mandrel of the unpublished liner hangers, however, has an outside diameter substantially equal to the inside diameter of the mold. Thus, the mandrel and mold can provide radial support for the expanded sleeve. With the other factors in equivalence, this increased radial lift reduces the “relaxation” of the relatively ductile expanded glove and, in turn, tends to increase the anchor carrying capacity. At the same time, the mandrel is easily provided with a maximum internal diameter equal to the liner to be installed, thus avoiding any constriction of the duct supplied through the well.

Expandable liner hangers, as they are necessarily manufactured using ductile alloys, which are generally less corrosion resistant, are more susceptible to corrosion and cannot be used, or should be used with a life expectancy. shortest time in corrosive environments. The unrestrained suspension chuck, however, can be produced with high performance alloys, which are far more corrosion resistant. The expandable sleeve of the unprecedented suspensions are manufactured using ductile, less corrosion resistant alloys, but it is interesting that compared to a liner, only a relatively small surface area of the sleeve will be exposed to corrosive fluids. The length of the seal formed by the glove is also much larger than the thickness of a liner, expanded or not. Thus, unprecedented suspensions are expected to have longer service lives in corrosive environments.

The expandable sleeve of the unpublished anchor assemblies is also preferably fitted with various fastening and sealing elements to intensify the seal between the expanded sleeve and an existing liner and to increase the carrying capacity of the unpublished hangers. For example, as can be seen from Figure 7, the glove 22 is provided with annular space gap seals 27 and radially and axially spaced wedges 28 fitted to its outer surface. Annular space space seals can be manufactured from a variety of conventional materials, such as thermally cured elastomers, spiral or not, and graphite impregnated fabrics. Wedges may be provided by conventional processes, for example by machining wedges to form a glove, or by welding crushed steel and tungsten carbide or other metal particles to the surface of the glove with a thin nickel or other thin welding cap. Conventional welders. When these seals and wedges are used, the glove is preferably fitted with a gauge shield to minimize contact between these elements and the casing wall as the anchor assembly descends into the well.

[0119] As will be appreciated by those skilled in the art, the precise dimensions of the expandable glove can be variable so that, with the other factors in equivalence, providing greater or lesser carrying capacity and allowing for greater or lesser expansion forces. The outside diameter of the sleeve will necessarily be determined primarily by the inside diameter of the liner in which the anchor will be installed and the degree of expansion desired. The thickness of the glove will be coordinated with the tensile and ductility properties of the material used in the glove to provide the desired balance of load capacity and expandability. In general, the longer the glove, the greater the carrying capacity. Thus, the length of the glove will typically be at least its diameter, and preferably will be at least 150% of the diameter, so as to provide sufficient surface area to allow loading capacities capable of supporting relatively heavy liners and other bottom tools. well components and well components. Unpublished anchor assemblies, therefore, may be provided with load capacities of at least 45,359 kg (100,000 lbs), more preferably at least 113,398 kg (250,000 lbs), and most preferably at least 226,796 kg (500,000 lbs). .

Thus, the unusual anchors of the present invention provide significant advantages and are preferably used in the practice of novel methods for installing and cementing a liner in a well and unpublished liner assemblies. However, as will be appreciated from the discussion below, other hangers that provide a seal with an existing liner when seated, or hangers with separate sealing members may be used in the novel methods and novel liner assemblies. For example, expandable liners, as disclosed in Braddick ‘880, Harrell‘ 169, and Baugh ‘667, establishing a seal with an existing liner while being seated, may be adapted for use in the present invention. The expandable liner and the total weight of the liner will be coordinated so that the liner can be substantially supported and immobilized during the cementation process.

[0121] Gear Mechanism [0122] As noted above, unpublished anchor assemblies are designed for use in combination with a tool for installing the anchor in a tubular duct. For example, the installation tool 3 may be used to install the liner hanger 11. More specifically, the lowering tool 12 is used to removably engage the hanger 11 and the seating tool 13 is used to actuate the mold 21. and seating the glove 22. There are a variety of mechanisms that can be incorporated into the tools to provide this actuation and the releasable hitch. In this regard, however, the present invention does not include any specific tool or mechanism for removably engaging, actuating, or otherwise installing unpublished anchor assemblies. Preferably, however, unusual anchors are used with the tools disclosed herein. These tools are able to install unusual anchors simply and reliably. In addition, as will be discussed further at this time, they incorporate various novel attributes and represent other embodiments of the present invention.

The descent tool 12 and the laying tool 13, as will be appreciated from the comparison of Figures 2-7, share a common tool mandrel 30. The tool mandrel 30 provides a base structure to which Directly or indirectly, the various components of the liner hanger 11, the lowering tool 12, and the laying tool 13 are connected.

[0124] Tool chuck 30 is attached at its upper end to a work column 5 (see Figure 1A). Thus, it provides a duct for the passage of working column 5 fluids which are used, among other purposes, to balance the hydrostatic pressure in the well, to hydraulically actuate the laying tool 13 and finally the mold 21, and to inject cement into liner 2. Mandrel 30 also provides axial and rotary force transmission of work column 5 as needed to lower the hanger 11 and liner 2, drill a well during descent, seat the hanger 11, and release and retrieve the lowering tool 12 and the laying tool 13, all as detailed below.

[0125] Tool chuck 30 is a generally cylindrical body. Preferably, as illustrated, it comprises a plurality of tubular sections 31 to facilitate assembly of the installation tool 3 and liner hanger 11 as a whole. Tubular sections 31 may be joined by conventional threaded connectors. Preferably, however, the tool chuck sections 31 are connected by novel gear mechanisms of the present invention.

[0126] Unpublished gear mechanisms include shaft sections with threaded ends for joining. Shaft sections have prismatic outer surfaces adjacent to their threaded terminals. A threaded connector connects the threaded terminals of the shaft sections. The connector has axial grooves. A pair of gear rings are slidably supported on the prismatic outer surfaces of the shaft sections. The gear rings have prismatic inner surfaces that engage the prismatic outer surfaces of the shaft sections and axial grooves that engage the axial grooves in the threaded connector. Preferably, the unpublished gear mechanisms also comprise recesses adjacent to compatible prismatic surfaces that allow limited rotation of the gear rings in prismatic shaft sections to facilitate engagement and disengagement of compatible prismatic surfaces.

Accordingly, the mandrel 30 of the installation tool 3 includes a preferred embodiment 32 of the unpublished gear mechanisms. More particularly, the mandrel 30 is comprised of several tubular sections 31 joined by unpublished connector assemblies 32. Connector assemblies 32 include threaded connectors 33 and gear rings 34. Figures 8-9 show the mandrel portion 30 and the assembly connector 32a which is seen in Figures 2 and which is representative of the connections used to constitute the mandrel 30. As shown in these figures, the lower end of the tubular section 31a and the upper end of the tubular section 31b are threaded on and joined by the threaded connector 33a. The threads, as is common in the industry, are right-hand threads, meaning that the connection is tightened by turning the tubular section to the right, that is, turning clockwise. Unpublished gear mechanisms, however, can also be used for left-hand connections. Gear rings 34a and 34b are slidably supported on tubular sections 31a and 31b, and when in the coupled or "formed" position as shown in Figure 8A, touch connector 33a. Connector 33a and rings 34a and 34b have compatible slots that provide mutual swivel engagement.

[0128] The tubular sections 31 have prismatic outer surfaces 35 adjacent their threaded terminals. That is, the normally cylindrical outer surfaces of the tubular sections 31 have been cut to provide a plurality of axially extended flat surfaces along the tubular section so that, when viewed in cross section, the flat surfaces define or can be extended to define a polygon. . For example, as best seen in Figure 9A, tubular section 31a has octagonal prismatic outer surfaces 35. The inner surface of gear ring 34a has compatible octagonal prismatic inner surfaces 36. Gear ring 34b has a similar construction. Thus, when in their coupled positions, as shown in Figure 9A, prismatic surfaces 35 and 36 provide rotary engagement between sections 31a and 31b and rings 34a and 34b. It is therefore interesting that torque can be transmitted from one tubular section 31 to another tubular section 31 via rings 34 and connectors 33 without applying torque to the threaded connections between tubular sections 31.

Figures 8B and 9B show connector assembly 32a in depleted states. It is noted that prismatic surfaces 35 extend axially in tubular sections 31a and 31b and allow the grooves in rings 34a and 34b to slide to engage and disengage from the grooves in connector 33a, as can be appreciated by comparing Figures 8A and 8B. The recesses are preferably provided adjacent to compatible prismatic surfaces to facilitate sliding. For example, as can be seen from Figure 9, recesses 37 are provided adjacent to prismatic surfaces 36 in ring 34a. These recesses allow ring 34a to rotate to a limited degree in tubular sections 31a. When turned to the left, as shown in Figure 9B, surfaces 35 and 36 are disengaged, and ring 34a may slide more freely on tubular section 31a. Thus, rings 34 can be more easily engaged and disengaged from connectors 33. When rings 34 are moved to engage connectors 33, rings 34 and connectors 33 can be rotated together clockwise to complete the formation of the connection. Preferably, set screws, pins, keys, or the like (not shown) are then installed to secure the rings 34 and prevent them from moving axially along the tubular sections 31.

[0130] It is therefore interesting that unpublished gear mechanisms provide effective and reliable torque transmission in both directions through a sectioned duct, such as tool chuck 30. Compared to conventional setscrews and other elements Similarly, compatible prismatic surfaces and grooves in the connector and rings provide a much larger surface area through which torque is transmitted to the right. Thus, much higher rotational forces, and forces far beyond the torque limit of the threaded connection, can be transmitted clockwise through a sectioned duct and its connector assemblies without risk of damage to the threaded connections. Unprecedented gear mechanisms, therefore, are particularly suited to the tools used in drilling a liner and other applications that subject the tool to high torque. In addition, as the rings cannot rotate counterclockwise, or when recesses are provided, they can rotate counterclockwise to a limited degree only, the left torque can be applied to a tool chuck without risk of loosening. or unscrew the connection. Thus, the tool may be designed to utilize reverse rotation as well as may be required for seating or releasing a liner or other well component without risk of disassembly of the tool into a well hole.

At the same time, however, it is interesting that the mandrel 30 may consist of conventional connections. Furthermore, unpublished liner hangers can be used with tools having a conventional mandrel, and thus unpublished gear mechanisms are not part of this aspect of the present invention. Furthermore, it is interesting that unprecedented gear mechanisms can be advantageously used in the constitution of tubular columns, chucks for other tools, or other sectioned ducts or shafts, or any other threaded connection where the threads must be protected from excessive torque.

[0132] Descent Assembly [0133] Descent tool 12 includes a hoop mechanism that removably engages the suspender mandrel 20 and which basically supports the weight of liner 2 or other well components directly or indirectly connected to the mandrel of the hanger 20. The lowering tool 12 also includes a releasable torque transfer mechanism for transferring torque to the suspender mandrel 20 and a releasable clamp mechanism that provides a connection between the lowering tool 12 and the tool mandrel 30.

[0134] The tubular section 31 g of the mandrel 30 provides a base frame on which the various other components of the lowering tool 12 are mounted. As will be appreciated from the discussion below, most of these other components are slidingly supported, directly or indirectly, in the 31 g tubular section. While mounting the installation tool 3 and liner hanger 11 and to some extent in their lowered position, however, they are fixed axially to the tubular section 31 g by the clamp mechanism, which can be released to allow release of the rim mechanism that engages the hanger chuck 20.

More particularly, as best seen in Figure 7, the descent tool 12 includes a rim 40 having a slidingly supported annular space base on the mandrel 30. A plurality of projections extend axially downwardly from the rim base 40. The projections of the rim have swollen ends 41 extending radially outwardly and when the descending tool 12 is in its descent position as shown in Figure 7A, they engage the corresponding annular space recesses 29 in the hanger mandrel 20 A lower ring 42 is threaded at the end of the tool mandrel 30, and its upper beveled end provides radial and axial support for the ends 41 of the rim 40. Thus, the rim 40 can support the weight of the mandrel 20, liner 2, and any other well components that may be directly or indirectly connected to it. Bottom ring 42 also provides a connection, for example by means of a threaded bottom end, to a smooth gasket 15 or other well components that may be included below the hanger 11 in liner assembly 1 as desired.

As can best be seen from Figures 6-7, the rim 40, or more precisely, its annular space base is slidably supported on the mandrel 30 within an assembly including a sleeve 43, an annular space space cap 46, an annular space gap glove cap 44, and annular space gap pressure cap 45. Glove 43 is generally disposed within the suspender mandrel 20 and slidingly engages its inner surface. The sleeve cap 44 is threaded to the lower end of sleeve 43 and is slidably carried between the hanger mandrel 20 and the rim 40. The pressure cap 45 is threaded to the upper end of sleeve 43 and is slidably carried between the mold 21 and the tubular section 31 g. The rim cap 46 is threaded to the upper end of the rim 40 and is slidably carried between the sleeve 43 and the tubular section 31 g. Rim subset 40 and cap 46 are spring-loaded inside sleeve 43 between sleeve cap 44 and pressure cap 45.

As can be seen from Figure 6, the pressure cap 45 at its upper end is supported by an annular space clamp housing 47 and at its lower end is supported by the suspension mandrel 20. The suspension mandrel 20 and pressure cap 45 rotatably engage each other via compatible grooves, similar to those already described with reference to connector assemblies 32 joining tubular sections 31. In addition, although not shown in any detail, tubular section 31 g is provided with radially spaced tabs on its outer surface which rotatably engage corresponding slots in the pressure cap 45. The slots extend laterally and circumferentially from the tabs to allow, for the reasons discussed below, that the tubular section 31 g move axially down and rotate counterclockwise a quarter turn. On the other hand, however, when the lowering tool 12 is in its lowering position the engagement between these tabs and slots provides a clockwise rotary engagement between the tubular section 31 and the pressure cap 45, thereby finally allowing the torque clockwise from the tool chuck 30 to the hanger chuck 20. The descent tool 12 can therefore be used for drilling in the liner. That is, a drill bit can be fixed to the end liner 2 and the well bore extended by turning the work column 5.

Although not shown in full or in greater detail, it is interesting that the clamp housing 47 and the tubular section 31 g of the mandrel 30 have cooperating recesses that trap a plurality of clamps 48 in the commonly used manner. in technique. These recesses allow the clamps 48 to move radially, that is, to enter and exit to some extent. Interestingly, the inner (in this sense the lower) ends of the clamps 48 are provided with claws that engage the recess in the tubular section 31 g. The annular space-space surfaces of these jaws and recesses are coordinated such that the downward movement of the mandrel 30 relative to the clamp housing 47, for reasons which will be discussed below, drives the clamps 48 externally. In the down position, as shown in Figure 6A, however, a locking piston 50, which is slidably supported on tubular section 31 g, rests on the clamp housing 47 and the tops of the cavities in which the clamps 48 are attached. transported. Thus, the radial outward movement of the clamps 48 is further limited and the clamps 48 are held in the inward facing position where they engage the clamp housing 47 and the tubular section 31 g.

In this way, the clamps 48 are capable of providing a translational engagement between the mandrel 30 and the lowering tool 12 when in the lowering position. Such a coupling is not typically loaded with high force when the tool is in the down position as the weight of the installation tool 3 and liner 2 is transmitted to the tool chuck 30 basically through the ends of the rim 41 and the ring. 41 and torque is transmitted from the chuck 30 through the pressure cap 45 and the hanger chuck 20. The engagement provided by clamps 48, however, facilitates mounting of the installation tool 3 and the hanger 11 and will withstand any compressive load. inadvertently applied between the hanger 11 and the tool spindle 30. Thus, the clamps 48 will prevent the liner hanger 11 and the descent tool 12 from moving upward on the spindle 30 which would otherwise occur if the tool assembly liner 1 is suspended while it is lowered into the existing liner. The release of the clamps 48 from this engagement will be described in more detail below in the context of setting the hanger 11 and releasing the lowering tool 12.

Interestingly, the descent tool 12 described above provides an effective and reliable mechanism for removably engaging the liner hanger 11, to ensure that the liner hanger does not move axially on the mandrel 30, and to transmit torque. This is a tool which is preferably used in conjunction with the liner hangers of the present invention. At the same time, however, other conventional lowering mechanisms, such as those using a left-hand threaded nut or clamps only, may be used, particularly as it is not necessary or desirable to provide torque transmission through the lowering mechanism. The present invention is under no circumstances limited to a specific descent tool.

[0141] Settlement Set [0142] Settlement Tool 13 includes a hydraulic mechanism for generating translation force relative to the tool mandrel and the work column to which it is attached, and a mechanism for transmitting this force to the mold. 21 which, when actuated, expands the metal sleeve 22 and seats the hanger 11. It is connected to the descent tool 12 through its common tool mandrel 30, with tubular sections 31 af of mandrel 30 providing a base structure over the which various other components of the laying tool 13 are assembled.

[0143] As shown in Figure 2-5, the hydraulic mechanism comprises several cooperating hydraulic actuators 60 supported on tool chuck 30. These hydraulic actuators are linear hydraulic motors designed to provide linear force to mold 21. Individuals Those skilled in the art will appreciate the fact that actuators 60 are interconnected so as to "stack" the force of each actuator 60 and that it is possible to vary in number and size to produce the desired linear force to expand the sleeve 22.

[0144] As is common with such actuators, they comprise a mandrel. Although actuators for other applications may employ different configurations, the mandrel in unpublished actuators, as is typical of oil well tools and components, the mandrel is preferably a generally cylindrical mandrel. A hydraulic cylinder is slidably coupled to the mandrel. The hydraulic cylinder has a lower hydraulic chamber with an inlet port and an upper hydraulic chamber with an outlet port. Typically, but not necessarily, conventional hydraulic cylinders will include a stationary sealing member, such as a piston, sealing, or mandrel extension itself, which extends continuously around the outside of the mandrel. A hydraulic cylinder or drum is slidably supported on the outer surfaces of the mandrel and stationary sealing member. The cylinder includes a sleeve or other body member with a pair of dynamic sealing members, such as pistons, seals, or body member extensions, spaced apart on each side of the stationary sealing member and slidingly holding the cylinder. The stationary sealing member divides the cylinder interior into two hydraulic chambers, an upper chamber and a lower chamber. An inlet port provides fluid communication with the lower hydraulic chamber. An outlet port provides fluid communication with the upper hydraulic chamber. Thus, when fluid is introduced into the lower chamber, relative linear motion between the mandrel and the cylinder is produced. In seating tool 13, this is the downward movement of the cylinder relative to the mandrel 30.

[0145] For example, the element that can be viewed as lower hydraulic actuator 60e is shown in Figure 4. This lower hydraulic actuator 60e comprises floating pistons ring space 61 and 61 f. Floating pistons 61 and 61f are slidably supported on the tool mandrel 30, or more precisely, in tubular sections 31 and 31f, respectively. A cylindrical sleeve 62e is connected, for example, by means of threaded connections to floating pistons 61 and 61 f and extends therebetween. A ring-space stationary piston 63e is connected to the tubular section 31f of the tool arbor 30, for example by means of a threaded connection. Preferably, retaining screws, pins, keys, or the like are provided to secure these threaded connections and reduce the likelihood of loosening.

In the downward position shown in Figure 4A, floating piston 61f is in close proximity to stationary piston 63e. A lower hydraulic chamber is defined between them, pushing the pistons apart or providing recesses in one or both, and a port is provided through the mandrel to allow fluid communication with the lower hydraulic chamber. For example, the floating piston 61 f and the stationary piston 63e are provided with recesses defining a lower hydraulic chamber 64e therebetween, even if the pistons 61 f and 63e are contiguous. One or more inlet ports 65e are provided in tubular section 31f to provide fluid communication between the interior of the tool mandrel 30 and the lower hydraulic chamber 64e.

Floating piston 61 and, on the other hand, are distant from stationary piston 63e, and an upper hydraulic chamber 66e is defined therebetween. One or more outlet ports 67e are provided on floating piston 61 and for providing fluid communication between upper hydraulic chamber 66e and the outside of cylinder sleeve 62e. Alternatively, the outlet ports could be provided in the cylinder sleeve 62e, and it is interesting that the outside of the cylinder sleeve 62e is in fluid communication with the outside of the tool, ie the well bore, through clearance between cylinder sleeve 62e and mold 21. Thus, fluid flowing through inlet ports 65e into lower hydraulic chamber 64e will propel floating piston 61 f downwards and in turn cause fluid to overflow. of upper hydraulic chamber 66e through outlet ports 67e, allowing actuator 60e to descend along mandrel 30, as can be seen in Figure 4B.

[0148] The seating tool 13 includes another similarly constructed actuator 60d located above the newly described actuator 60e. Parts of actuator 60d are shown in Figure 3 and 4.

[0149] The seating tool 13 engages the liner hanger mold 21 via another hydraulic actuator 60c which is located above the hydraulic actuator 60d. More particularly, as can be seen from Figure 3, the coupling actuator 60c comprises a pair of floating pistons 61c and 61d connected by a sleeve 62c. Floating pistons 61c and 61d are slidably supported, respectively, in tubular sections 31c and 31d around stationary piston 63c. One or more inlet ports 65c are provided in tubular section 31c to provide fluid communication between the interior of the tool mandrel 30 and the lower hydraulic chamber 64c. One or more outlet ports 67c are provided in cylinder sleeve 62c to provide fluid communication between upper hydraulic chamber 66c and the exterior of actuator 60c.

It is noted that the upper portion of the sleeve 62c extends above the mold 21 while its lower portion extends through the mold 21, and that upper end of the sleeve 62c is dilated with respect to its lower portion. An annular gap space adjustment ring 68 is connected to the small diameter portion of sleeve 62c by, for example, threaded connections. An annular space stop ring 69 is slidably carried on the small diameter portion of sleeve 62c in position just below adjusting ring 68 and just above and adjacent to mold 21. Adjusting ring 68 and stop ring 69 are joined jointly by shear pins (not shown) or other shear members. Interestingly, when mounting the installation tool 3, the rotation of the adjusting ring 68 and the stop ring 69 allows relative movement between the seating tool 13 and the lowering tool 12 on one hand and the liner hanger 11 on the other hand, finally allowing to align the ends of the rim 41 of the lowering tool 12 in the annular space recesses 29 of the hanger mandrel 20.

[0151] Seating tool 13 includes elements that can be viewed as additional drive actuators 60a and 60b located above the coupling actuator 60c shown in Figure 3. As with the other hydraulic actuators 60, and as shown in Figure 2, the uppermost hydraulic actuator 60a comprises a pair of floating pistons 61a and 61b connected by a sleeve 62a and slidably supported respectively in tubular sections 31a and 31b around stationary piston 63a. One or more inlet ports 65a are provided in tubular section 31a to provide fluid communication between the interior of the tool mandrel 30 and the lower hydraulic chamber 64a. One or more outlet ports 67a are provided on floating piston 61a to provide fluid communication between upper hydraulic chamber 66a and the exterior of actuator 60a. (It is to be understood that actuator 60b, as shown partially in Figures 2 and 3, is constructed similarly to actuator 60a.) [0152] Interestingly, hydraulic actuators 60 are preferably immobilized in their downward position. Moreover, they can be actuated to a greater or lesser extent by differences in hydrostatic pressure between the inside of the mandrel 30 and the outside of the installation tool 3. Thus, the laying tool 13 preferably incorporates shear members such as pins, screws, and similar elements or other means for detachably securing actuators 60 to mandrel 30.

The laying tool 13 preferably incorporates the hydraulic actuators of the present invention. Unpublished hydraulic actuators include a balancing piston. The balancing piston is slidably supported within the upper hydraulic chamber of the actuator, preferably over the mandrel. The balancing piston includes an axially extended passage through the balancing piston. Fluid communication through the piston and between its upper and lower faces is controlled by a normally closed valve in the passage. Thus, in the absence of relative movement between the mandrel and cylinder, the balance piston may slide in response to a difference in hydrostatic pressure between the outlet port, which is on one face of the balance piston, and the hydraulic chamber portion. top that is on the underside of the balancing piston.

For example, as can be seen from Figure 2, actuator 60a includes balancing piston 70a. Balancing piston 70a is slidably supported on tubular section 31a of mandrel 30 in upper hydraulic chamber 66a between floating piston 61a and stationary piston 63a. When the seating tool 13 is in its downward position, as shown in Figure 2A, the balancing piston 70a is located in close proximity to the floating piston 61a. A hydraulic chamber is defined between them, either by pushing the pistons apart or providing recesses in one or both, and a port is provided through the mandrel to allow fluid communication with the hydraulic chamber. For example, floating piston 61a is provided with a recess defining a hydraulic chamber 71a between them, even if pistons 61a and 70a are contiguous.

Balancing piston 70a has an axially extended passage 72a through the portion of its body, that is, from its upper face to its lower face. The passage 72a is therefore capable of providing fluid communication through the balancing piston 70a, i.e. between the hydraulic chamber 71a and the remainder of the upper hydraulic chamber 66a. Fluid communication through the passage 72a, however, is controlled by a normally closed valve, such as the breach diaphragm 73a. When the diaphragm 73a is in its non-violable closed state, fluid cannot flow between the hydraulic chamber 71a and the remainder of the upper hydraulic chamber 66a.

Actuator 60b further includes a balancing piston 70b identical to the balancing piston 70a described above. Thus, when the seating tool 13 is in its downward position shown in Figure 2A, the balancing pistons 70a and 70b are able to equalize the pressure between the upper hydraulic chambers 66a and 66b and the outside of actuators 60a and 60b thus. as may occur, for example, when the liner 1 assembly is being lowered into the well. Fluid can access outlet ports 67a and 67b and, to the extent that external hydrostatic pressure exceeds hydrostatic pressure in upper hydraulic chambers 66a and 66b, balancing pistons 70a and 70b will be pushed down until pressures are balanced. This balance of internal and external pressures is important as it prevents deformation of the cylinder sleeves 62a and 62b, which could interfere with the travel of the sleeves 62a and 62b over stationary pistons 63a and 63b.

In addition, by not allowing significant amounts of fluid to enter a wellbore while liner assembly 1 is lowered into the well, balancing pistons 70a and 70b further increase the reliability of actuators 60a and 60b. That is, balancing pistons 70a and 70b greatly reduce the volume of debris that can access the upper hydraulic chambers 66a and 66b, and as they are located in close proximity to outlet ports 67a and 67b, the substantial portion of the track. of the course remains free and clear of debris. The hydraulic chambers 66a and 66b are preferably filled with clean hydraulic fluid during mounting of the laying tool 13, thereby ensuring that when actuated the floating lugs 61a and 61b and sleeves 62a and 62b will slide smoothly and respectively. , over tubular sections 31a and 31b and stationary pistons 63a and 63b.

Interestingly, for the purpose of balancing hydrostatic pressure between the upper hydraulic chamber and a borehole, the exact location of the balancing piston in the upper hydraulic chamber of the unpublished actuators is not essential. The piston may be positioned relatively close to a stationary piston and still provide such balance. In practice, the balancing piston will not have to travel a significant distance to balance the pressures and thus can initially be located almost anywhere in the upper hydraulic chamber between the outer opening of the outlet port and the stationary piston.

However, for the most practical aspect possible, the balancing piston on unpublished actuators is preferably mounted close to the outer opening of the outlet port to minimize exposure of the actuator interior to debris from the well bore. It may be mounted within a passageway, which may be referred to as a "door" such as doors 67a shown in illustrated embodiment 60a, or within a member called "chamber" such as the upper hydraulic chamber 66a shown in illustrated embodiment 60a. As will be appreciated in the present invention, therefore, by quoting the location of a balancing piston, the upper hydraulic chamber may be understood to include all cavities, chambers, fluid passages, and the like between the door outlet and the stationary piston. If mounted in a relatively narrow passage, such as outlet ports 67a, however, the balancing piston will have to travel longer distances to balance hydrostatic pressures. Thus, in the illustrated embodiment 60a the balancing piston 70a is mounted on the tubular sections 31a in the relatively larger upper hydraulic chamber 66a.

Interestingly, in order to provide more effective protection against debris, valves normally closed in the equilibrium position should be selected so that they are preferably not opened to any significant degree by pressure differentials. they are supposed to experience before actuator actuation. At the same time, as will be appreciated from the following discussion, they must open, ie allow the release of increasing hydrostatic pressure in the upper hydraulic chamber when the actuator is actuated. Most preferably, normally closed valves remain open when initially opened. Thus, tamper-resistant diaphragms are preferably employed because they provide reliable and predictable pressure release, and their construction is simple, allowing for easy installation. Other normally closed valve devices, such as check valves, pressure relief valves, and threaded plugs, however, may be used in the balancing piston on unpublished actuators.

As will be of interest to those skilled in the art, the actuator includes stationary and dynamic seals commonly used in the art to seal the gaps between actuator components and to allow efficient actuator operation as described herein. In particular, the clearances separating the balancing piston from the mandrel and sleeve, i.e. from the upper hydraulic chamber, are preferably fitted with dynamic seals to prevent involuntary leakage of fluid around the balancing piston. The seals can be mounted on the balancing piston or on the chamber as desired. For example, balancing pistons 70a and 70b may be fitted with dynamic annular space-space seals (not shown), such as the groove-mounted elastomeric O-ring on their inner surface tangent to tubular sections 31a and 31b and on their outer surfaces. tangent to gloves 62a and 62b, respectively. Alternatively, one or both seals may be mounted in the upper hydraulic chambers 66a and 66b, for example, in grooves in tubular sections 31a and 31b or sleeves 62a and 62b.

[0162] As noted above, before actuation, the balancing pistons essentially seal the upper hydraulic chambers and prevent debris from entering. Under certain circumstances, however, such as rising downhole temperatures, the pressure within the upper hydraulic chambers may increase beyond the hydrostatic pressure in the wellbore. Balancing pistons will be propelled upward until the pressure in the upper hydraulic chambers equals the hydraulic pressure in the wellbore. If a balancing piston eventually “hits the bottom” and hits the outlet port, however, the pressure inside the upper hydraulic chamber could continue to rise, possibly to the point where the diaphragm would rupture, thus allowing the diaphragm to rupture. fluid containing debris from the wellbore will access the chamber. Thus, unpublished actuators preferably incorporate a pressure release device which allows for potentially problematic pressure release from the upper hydraulic chamber as might otherwise occur if the balancing pistons hit the bottom.

For example, instead of using breakable diaphragms 73a and 73b, check valves or pressure relief valves may be mounted in passages 72a and 72b. Such valves, if used, would also allow a desired level of fluid flow through passages 72a and 72b during actuation. Alternatively, an elastomeric hydrostatic relief (burp) seal (not shown) may be mounted in one or both clearances separating balancing pistons 70a and 70b, respectively, from tubular sections 31a and 31b and sleeves 62a and 62b. These hydrostatic relief seals would then allow controlled release of fluid from the upper hydraulic chambers 66a and 66b respectively to the hydraulic chambers 71a and 71b if the balancing pistons 70a and 70b hit the bottom respectively respectively the floating pistons 61a and 61b. Such hydrostatic relief valves would, of course, be designed with a relief pressure sufficiently below the pressure required to open the tamperable diaphragm or other normally closed valve.

Preferably, however, the pressure relief device is provided on the cylindrical mandrel. For example, a check or pressure relief valve (not shown) may be mounted on tubular sections 31a and 31b to allow controlled release of fluid from the upper hydraulic chambers 66a and 66b to the interior of mandrel 30. This arrangement has An advantage over the hydrostatic relief seal as described above is that flow would have to be mastered through a hydrostatic relief seal in order to form sufficient pressure to rupture the diaphragm or otherwise open a normally closed valve device. If a pressure relief device is provided in the cylindrical mandrel, the pressure in the upper hydraulic chamber will be equal to the pressure inside the mandrel, and there will be no flow through the pressure release device to be mastered.

In addition, the seating assemblies of the present invention preferably include some means for indicating whether the mold has been fully struck and positioned under the expandable metal sleeve. Thus, as shown in Figure 5, seating tool 13 includes a sliding indicator ring 75 supported on tubular section 31f just below actuator 60e described above. When the seating tool 13 is in its down position, the indicator ring 75 is secured to the tubular section 31 f by means of a shear member, such as a bolt or pin (not shown). However, it is positioned in section 31f relative to the floating piston 61f so that when the floating piston 61f has reached the full length of its travel, it will reach the indicator ring 75 and shear the member securing it to the section. 31 f. Thus, the indicator ring 75 will be able to slide freely over the mandrel 30 and, when the tool is recovered from the well, it can be readily confirmed that the seating tool 13 has fully struck and seated the metal sleeve 22.

Interestingly, the seating tool 13 described above provides an effective and reliable mechanism for actuating the mold 21, and incorporates unprecedented hydraulic actuators that confer significant advantages over the prior art. Thus, it is a preferred tool for use with the anchor assemblies of the present invention. At the same time, however, there are a variety of hydraulic mechanisms and other types of mechanisms commonly used in downhole tools that generate linear motion and force, such as hydraulic jack mechanisms and mechanisms actuated by explosive loads or releasing weight on, pushing, pulling, or rotating the work column. In general, such a mechanism can be adapted for use with unpublished anchor sets, and no specific seating mechanism or tool is required to seat unpublished anchor sets.

Interestingly, unpublished seating assemblies, which include hydraulic actuators with a balancing piston, are able to balance hydraulic pressures that would otherwise damage the actuator and can keep the actuator free of debris that could interfere with its operation. Such improvements are desirable not only in laying the anchor assemblies of the present invention, but also in operating other tools and downhole components where hydraulic actuators or other means for producing linear force are required. Accordingly, the present invention in this regard is not limited to the use of unpublished seating assemblies to actuate a particular anchor assembly or any other downhole tool or component. They can be advantageously used in the seating assemblies of many other wellbore tools such as expandable elements, expandable liner hangers, liner hangers, dispersion wedges, shutters, mechanical plugs, cement plugs, drill plugs, pipe slotted, and polished access receptacles (PBRs).

[0168] Flow Disperser Assembly [0169] As noted above, liners will typically be cemented into a well and therefore unpublished liner assemblies preferably incorporate tools for performing cementation operations such as flow dispersers. return of the present invention. Unpublished return flow dispersers comprise a cylindrical body adapted for installation in a well as part of a liner. The cylindrical body has a fluid port, typically a plurality of such ports, adapted to allow flow of fluid displaced by a cementing operation from an annular gap between the liner and the well to the tool.

[0170] The cover is supported on the cylindrical body for movement from an open position where the door is open to a closed position where the door is closed by the cover. A transmission is arranged within the cylindrical body. The transmission defines a cylindrical passageway adapted to accommodate a tubular duct extending through the cylindrical body, which duct may be used to inject cement into the liner below the flow disperser. The transmission is removably engaged with the cover and operable to move the cover from open to closed position.

For example, the preferred liner assembly 1 incorporates the preferred return flow disperser 10, cement plug 14, flat gasket 15, and a rubber liner cap (not shown). Flow spreader 10 and cement plug 14, as shown in Figure 1, are incorporated into liner assembly 1 below the suspender 11. As can be seen from Figure 7, the smooth joint 15 is a tubular section connected to the specifically the lower ring 42 at the end of the tool mandrel 30. It has a significantly smaller outside diameter than the inside diameter of the hanger mandrel 20 and necessarily of the mold 21. It extends upwardly from the tooling mandrel. downstream 12 through the flow spreader 10 as shown in Figure 10 and the cement plug 14 (not shown).

Preferred flow disperser 10 comprises a generally cylindrical housing 80 which, as discussed below in more detail, will eventually form part of liner 2 which is installed in the well. Its inner surface generally defines a cylindrical duct which preferably has a diameter at least the width of the tubular liners 8 with which it will be mounted. An upper portion 81 of housing 80 is provided with an enlarged outer diameter and a gauge ring 82 is secured to the lower end of housing 80 to provide gauge protection to flow spreader 10. Both ends of housing 80 are threaded so that it can be threaded. be incorporated into liner assembly 1. Specifically, housing 80 is mounted on liner assembly 1 below the liner hanger 11, as shown in Figure 1, and is directly or indirectly connected via tubular liners or connectors, to the suspender mandrel 20. Cement plug 14 is incorporated and connected to liner assembly 1 in a similar manner below flow spreader 10.

As shown in more detail in Figure 10, the spreader housing 80 comprises several doors 83 defined in its walls. The ports 83 are configured and sized to allow fluid to flow between the interior of the housing 80 and the annular space between the liner assembly 1 and the well into which it is lowered. In particular, as described below, they are configured and sized to allow displaced fluid to flow from annular space during cementation operations from annular space to housing 80.

Cylindrical sleeve 84 is supported on the outer surface of housing 80. As will be appreciated from the comparison of Figures 10A and 10B, sleeve 84 is supported for axial movement from an open, downward position where Ports 83 are discovered by sleeve 84 as shown in Figure 10A, to a closed, installed position where sleeve 84 covers ports 83 as shown in Figure 10B. The doors 83, when the sleeve 84 is in its open downward position, allow fluid displaced from a cementing operation to flow from the annular space into the liner assembly 1, as described in more detail below. By covering the ports 83, the sleeve 84 substantially prevents fluid from flowing from the annular space to the flow disperser 10, so that the integrity of liner 2, in which housing 80 is incorporated, will be maintained.

Unpublished flow dispersers, as they are mounted and lowered with a liner assembly, comprise a transmission that is disposed within the cylindrical body and removably engaged with the cover and operable to move the cover from the open position to the position. closed. For example, preferred flow spreader 10 comprises a transmission 90 that is operable to move sleeve 84 from its open position to its closed position. As can be seen from Figure 10, the transmission 90 comprises a conveyor 91 and a rim 92. The conveyor 91 is a generally cylindrical sleeve-like body disposed within the spreader housing 80. The rim 92, similar to the rim 40 , has an annular space base 93 and a plurality of flexible projections 94. Annular space base 93 of rim 92 is slidably supported on the outer surface of conveyor 91, so that rim 92 is disposed between conveyor 91 and housing 80. The enlarged ends 95 of the rim 94 projections extend through the slots 85 in the housing 80 to engage corresponding recesses in the sleeve 84. They are prevented from distending by disengaging from the sleeve 84 by an enlarged lower portion 98 of the conveyor 91. Thus, the rim 92 engages the sleeve 84 as the flow spreader 10 descends into the well.

The annular space base 93 of the rim 92, in turn, is removably engaged with the conveyor 91, for example by the shearing cable96. Alternatively, the rim 92 may be removably engaged with the conveyor 91 by means of pins, screws and similar shear elements. The rim 92 may also be removably engaged with the carrier 91 by the clips, such as the radially displaceable clips shown in Figure 14A and 14B and discussed below. In any event, the sleeve 84, the rim 92, and the conveyor 91 are engaged together as the flow spreader 10 descends into the well. Moreover, and specifically when the shear rope 96 has been sheared during operation of the flow spreader 10 as described below, the conveyor 91 may slide axially into the annular space base 93 of the rim 92 as described in more detail below. The conveyor 91 is also provided with a screw cap 97, and a torsion spring is disposed between the conveyor cap 97 and the base of the rim 93 to facilitate mounting of the transmission 90 in the spreader housing 80.

The conveyor 91 defines a cylindrical passageway through which the smooth joint 15 extends. The smooth gasket 15, as noted above, is connected at its upper end to the mandrel 30 which, in turn, is connected to the working column 5. Preferably it is connected at its lower end to other components of the liner assembly, such as a ball seat assembly, a cap retainer assembly, and a rubber liner cap, which are used in cementing or other tool operations. In any event, the smooth joint 15 along with these other components provide a conduit through which cement may be introduced into liner 2 below the flow spreader 10 and cement buffer 14. As cement is introduced into Iiner2, the cement buffer 14 prevents the cement from ascending to liner 2 and the flow disperser 10 and the returns are freely flowed from the annular space through gates 83 and then into housing 80.

In addition, unpublished dispersors preferably incorporate a one-way seal such as one or more nozzle seals or, as shown in Figure 10A, a suction cup 86. Suction cup 86 is mounted to the smooth gasket 15. above a port 83 and provides a one-way seal between the flat gasket 15 and the housing 80. It comprises a cup-shaped elastomeric member, as conventionally used in the art, that allows fluid to flow through the housing 80 in an upward direction beyond suction cup 86. If fluid pressure is applied above suction cup 86, however, the elastomeric member will expand against housing 80, forming a seal therewith, and will prevent fluid from flowing out. in the downward direction. As discussed below, providing a suction cup or other one-way seal facilitates pressure testing of a seal established between the liner and an existing liner prior to performing a cementing operation, while still allowing fluid to flow. The displaced flow up the unpublished flow dispersers as the liner is cemented. In addition, it is interesting that suction cup 86 also helps minimize debris ingress into flow disperser 10 as it descends into the well.

The smooth joint 15 further comprises an expansion or ring 16, so that the transmission 90 may be actuated to move the sleeve 84 to its closed position after a cementing operation is completed. This can be better appreciated by comparing Figure 10A, which shows the flow spreader 10 in its downward position where the doors 83 are open, and Figure 10B, which shows the spreader 10 after the doors 83 have been closed.

More specifically, the doors 83 may be closed by pulling the working column 5 to which the smooth joint 15 is finally connected. While the smooth joint 15 performs an upward stroke, the ring 16 will engage the swollen lower end 98 of the conveyor 91 and promote upward movement of the conveyor 91 along the smooth joint 15. At that point, as the annular space base 93 of the rim 92 is removably engaged with the carrier 91 and the swollen ends 95 of the rim projections 94 are removably engaged with the sleeve 84, the upward movement of the carrier 91 will cause the sleeve 84 to move up to its closed position shown in Figure 10B. The upper end of the sleeve 84 is slotted, thereby providing grooves 87 that can flex to a limited degree and, by means of the protrusions (not shown), fit into the annular space groove 88 of the housing 80. The sleeve 84 is then secured in position closed.

When transmission 90 has moved up to the point shown in Figure 10B, where sleeve 84 is in its closed position, the enlarged ends 95 of the rim projections 94 engage the upper end of the slots 85 in the housing 80. Applying additional upward force to the work column 5 and the flat joint 15 will therefore shear the handle 96 and disengage the carrier 92 rim 91. Further upward movement of the flat joint 15 will move the swollen end 98 of the projection conveyor 91 rim 94 and promote engagement with the lower shoulder of the base space annular space 93 of rim 92. At this point, the additional upward movement of the smooth joint 15 and conveyor 91, since the projections of rim 94 at that time may flex, will cause the enlarged rim ends 95 to exit the recesses in sleeve 84 and slots 85 to the inner surface of housing 80, thereby disengaging transmission 90 of sleeve 84. All The transmission 90 may then be removed from the flow spreader 10, leaving the housing 80 with the sleeve 84 retained in its closed position blocking the flow through the ports 83 as part of the installed liner 2.

[0182] Further details of the operation of unpublished flow dispersers and cementing operations are discussed below in the context of the operation of the liner assembly as a whole. However, it is immediately apparent that unpublished flow dispersers provide significant advantages over the prior art. The unpublished flow disperser housing is designed to remain in the well as part of the installed liner. Thus, it is important that the flow disperser not only provides an effective and sealing flow path for returns, preferably it also does not limit the effective inner diameter or outer diameter of the coating as a whole. By arranging the transmission inside the housing, and allowing it to be released from the cover and retrieved from the well, unusual tools provide a tapered profile. The flow spreader, therefore, lies within the profile of the liner assembly as it descends into the well and, having the liner fully installed, its internal diameter is at least the width of the liner as a whole. At the same time, other elements being in equivalence, unpublished flow dispersers are able to provide a relatively large flow path for returns during cementing operations and, when the transmission is removed, will not constrict the installed liner. Operation of a cover by an externally mounted transmission will inevitably require that the inside diameter of the housing be reduced to a given liner size, thereby limiting the internal effective diameter of the liner installed or creating a constriction therein.

In addition, unlike flow control devices for other well operations, unpublished flow dispersers comprise an opening designed to accommodate a smooth joint or other duct extended through the disperser. Thus, cement or other working fluids can be transferred to the liner parts below the flow disperser without diverting the injected fluids around the flow disperser. This also allows unusual tools to divert returns from a cementing operation without any prior actuation of the tool. A single operation for closing the doors after actuation is all that is required.

Interestingly, unpublished flow dispersers are not limited to the preferred flow disperser 10 discussed above. For example, the enlarged portion 81 of the flat gasket 15 or other radially protruding pins and similar elements provide simple and effective means for mechanically engaging and manipulating the transmission 90. However, other mechanisms for actuating the transmission of the unpublished flow dispersers may be provided. For example, spring-loaded clamps or pins may be mounted in the recesses of the conveyor so that they may engage cracks, grooves and similar elements in a smooth joint while pulled up. A ratchet assembly, similar to the ratchet ring 26 mounted between the hanger mandrel 20 and the mold 21, may also be provided between the conveyor and the flat joint to allow the flat joint to retract the conveyor as it is lifted. Other components, such as cement buffering, may also be used to engage a conveyor as discussed below. In addition, hydraulic cylinders could be connected to a conveyor or, in addition, it is possible to aggregate other mechanisms to actuate the conveyor rather than mechanically engaging and manipulating a smooth joint.

In addition, although glove 84 is adapted for axial upward movement, it is interesting that the covers of unpublished flow dispersers can be adapted for upward movement and cover the doors below the glove. Spring-loaded clamps or pins could be provided, as discussed above, to mechanically engage a conveyor and smooth joint for downward movement. Pivoting clamps could also be fitted to the smooth joint. These pivoting clamps could be located below the flow spreader, oscillating in and below a conveyor member while the smooth joint is lifted and then swinging out and engaging the conveyor when they have released their top edge and the smooth joint is moved. down.

Similarly, other mechanisms may be fitted to the unpublished flow dispersers to removably engage the transmission in the cover. For example, a conveyor could be removably and directly engaged with the cover by pins, screws, rings, or similar elements that would shear as soon as the cover reached its closed position. Radially displaceable clamps could also be mounted in J-slots on the conveyor, similar to clamps 48 mounted on tubular section 31 g as described below. Instead of a rim, a glove with radially displaceable or pivoting staples could be slidably held in, and releasably engaged with the carrier, the staples free to disengage from the cover to the recesses in the carrier when the carrier has moved up a distance defined relative to the glove.

Similarly, glove 84 or other covers may be supported on the inner surface of the housing. Slots would have to be provided in the housing, but otherwise an inner sleeve could be removably engaged with and driven by a transmission as described above. For example, as shown in Figure 11, a second preferred embodiment 110 of unpublished flow dispersers comprises a sleeve 184 which is slidably supported on the inner surface of a housing 180. The housing of the disperser 180 is quite similar to the housing 80 of the disperser. 10. It comprises a number of ports 183 which are configured and sized to allow displaced fluid to flow during a cementing operation into housing 180. As sleeve 183 is supported on the inner surface of housing 184, however, housing 180 it has a portion 181 with enlarged inner and outer diameters to accommodate sleeve 183. It is not yet necessary to provide slots, such as slots 85 which are provided in housing 80.

As will be appreciated from the comparison of Figures 11A and 11B, sleeve 184 is supported for axial movement from an open, downward position where doors 183 are discovered by sleeve 184 as shown in Figure 11A. to a closed, installed position where sleeve 184 covers doors 183 as shown in Figure 11B. The sleeve 184 is removably connected to and operated by a transmission 190 which is substantially identical to the transmission 90 in the spreader 10. Thus, these components, and other similar components of the flow spreader 110 are identified by serial reference numerals 100 comparable to the numbers. reference values used in the description of flow disperser 10 above.

Transmission 190, as can be seen from Figure 11, comprises a conveyor 191 and a rim 192. The swollen ends 195 of the rim projections 194 engage corresponding recesses in the sleeve 184. They are prevented from flexing to disengage from the sleeve 184 by means of an enlarged lower portion 198 of the conveyor 191. Thus, the rim 192 engages the sleeve 184 as the flow spreader 110 descends into the well.

As in the spreader 10 discussed above, the doors 183 in the spreader 110 are closed by lifting the smooth gasket 115, which causes its ring 116 to engage the dilated lower end 198 of the conveyor 191. Additional traction on the smooth gasket 115 causes conveyor 191 and rim 192 to move upwardly, bringing glove 184 to its closed position and blocking housing doors 183.

When the transmission 190 has shifted upward to the point shown in Figure 11B where the sleeve 184 is in its closed position, the upper end of the sleeve 184 engages a shoulder 185 formed by the enlarged portion 181 of the housing 180. A More upward force is applied to the working column 5 and the flat joint 115, so the cable 196 will be pulled out and the carrier 192 will be disengaged from the conveyor 191. Further upward movement of the flat joint 15 will move the swollen end 198 of the conveyor 191. position under the flexible projections of the rim 194 until it engages the lower shoulder of the base space annular space 193 of the rim 192. At this point, the additional upward movement of the smooth joint 115 and the conveyor 191, as the rim 194 projections are now able to flex, cause the enlarged ends of the rim 195 to leave the recesses in glove 184 going to the inner surface of glove 184, thereby disengaging transmission 190 of glove 184. The transmission 190 can then be removed from the flow spreader 10, leaving the housing 180 with the sleeve 184 retained in its closed position, blocking the flow through the ports 183 as part of the installed liner 2.

Covers may also be supported on the disperser housing for relative axial movement by threads, for example, as well as in another preferred embodiment 210 shown in Figure 12. Preferred flow disperser 210 comprises a sleeve 284 which is supported. inside a housing 280. Its construction is similar to sleeve 184 and housing 180 on flow spreader 110. Sleeve 284 and housing 280 on spreader 210, however, are engaged by compatible threads 289. Moreover, the nozzle housing 280 is substantially the same as the nozzle housing 180 of 110. It comprises a plurality of ports 283 that are configured and sized to allow flow of displaced fluid during a cementing operation into the housing 280.

As will be appreciated from the comparison of Figures 12A and 12B, glove 284 is supported for axial movement by rotating compatible threads 289 from an open lowering position where doors 283 are provided. discovered by glove 284 as shown in Figure 12A, to a closed, installed position where glove 284 covers ports 283 as shown in Figure 12B. Sleeve 284 is removably connected to a transmission 290 which is operable to move sleeve 284 from its open position to its closed position.

Transmission 290, as can be seen in Figure 12, comprises a conveyor 291 and a rim 292. The swollen ends 295 of the rim 294 projections engage the corresponding recesses in the sleeve 284. They are prevented from flexing and disengaging. of sleeve 284 by means of an enlarged lower portion 298 of conveyor 291. Thus, rim 292 engages sleeve 284 as flow spreader 210 descends into the well.

The swollen end 298 of the conveyor 291, however, is provided with a series of circumferentially spaced grooves 299, which as can be seen in Figure 12B, correspond to the circumferentially spaced grooves 217 in the smooth gasket ring 216 when the smooth gasket 215 is hoisted. When the slots 299 and 217 are engaged, the flat gasket 215 may be rotated by the work column 5, which in turn will rotate the transmission 290 and move the sleeve 284 upward to close the doors 283.

When the transmission 290 has shifted upward to the point shown in Figure 12B where the sleeve 284 is in its closed position, the upper end of the sleeve 284 engages the shoulder 285 formed by the swollen portion 281 of the housing 280. Application more upward force to working column 5 and flat gasket 215, therefore, will shear cable 296 and disengage carrier 292 from hoop 29. Further upward movement of flat gasket 215 will move dilated end 298 of carrier 291 from position under flexible projections of the rim 294 and even engaging the lower shoulder of the base space annular space 293 of the rim 292. At this point, the additional upward movement of the smooth joint 215 and the conveyor 291, as the rim 294 projections are now able to flex, will causing the enlarged rim ends 295 to leave the recesses in sleeve 284 going to the inner surface of sleeve 284, thereby disengaging the transmission 290 of sleeve 284. Transmission 290 may then be removed from flow spreader 210, leaving housing 280, with sleeve 284 retained in its closed position, blocking flow through ports 283 as part of installed liner 2.

Other covers may be adapted for rotational movement by providing flat joint pins that engage helical grooves in the inner surface of the carrier. Such rotary covers would be provided with doors aligned with doors in the tool housing when the cover is in its open position and rotatably come out of alignment in the closed position. Additionally, as exemplified by a fourth preferred embodiment shown in Figures 13A and 13B, the rim ends 395 may engage normal threads or helical grooves 399 on the inner surface of the sleeve 384. More particularly, the preferred embodiment 310 of the unpublished flow dispersers comprises a sleeve 384 which is slidably supported on the inner surface of a housing 380. The spreader housing 380 is quite similar to the spreader housing 180. It comprises a number of ports 383 that are configured and sized to allow flow of the displaced fluid during an operation. cementation to the interior of the housing 380.

Conversely to gloves 80, 180, and 280, respectively, on spreaders 10, 110, and 210, glove 384 in spreader 310 is provided with a series of doors 389 aligned with doors 383 in housing 380 when glove 384 is in place. in a downward, open position as shown in Figure 13A. As will be appreciated from the comparison between Figures 13A and 13B, glove 384 is supported for rotational movement from its open, downward position, where glove doors 389 are aligned with housing doors 383 as shown. Figure 13A, to a closed, installed position, where glove doors 389 rotate and exit alignment with housing doors 383, so that they are closed as shown in Figure 13B.

Sleeve 384 is removably connected to and operated by a transmission 390 which is similar to transmissions 90 and 190, respectively, on dispersers 10 and 110. Transmission 390 comprises a conveyor 391 and a rim 392 which are removably engaged by however, by the shear cable 396. The swollen ends 395 of the rim projections 394, however, extend to and engage the helical grooves 399 on the inner surface of the sleeve 384. They are prevented from flexing by disengaging from the sleeve 384 by means of a dilated lower portion 398 of conveyor 391. Thus, rim 392 engages sleeve 384 as flow disperser 310 descends into the well.

As in the spreaders 10, 110, and 210 discussed above, the doors 383 in the spreader 310 are closed by lifting the smooth gasket 315, causing its ring 316 to engage the dilated lower end 398 of the conveyor 391. The additional thrust on the smooth joint 315, however, causes the ends 396 of the rim projections 394 to travel through the grooves 399, which in turn causes the sleeve 384 to rotate to its closed position, blocking the doors. of accommodation 383.

When the transmission 390 has shifted upward to the point shown in Figure 13B where the sleeve 384 is in its closed position, the swollen ends 395 of the rim projections 394 engage the upper end of the helical grooves 399. more upward force to working column 5 and flat joint 315, therefore, will pull cable 396 and disengage carrier 392 from rim 39. Further upward movement of flat joint 315 will move dilated end 398 of carrier 391 from position under the flexible projections of the rim 394 until they engage the lower shoulder of the base space annular space 393 of the rim 392. At this point, the additional upward movement of the smooth joint 315 and the conveyor 391, as the rim 394 projections can now flex, will cause the enlarged rim ends 395 leave the helical grooves 399 in the sleeve 384 going to the inner surface of the sleeve 384, thereby disengaging the transmission 390 of the sleeve. 384. All transmission 390 may then be removed from flow spreader 310, leaving housing 380, with sleeve 384 retained in its closed position blocking flow through ports 383 as part of installed liner 2.

As noted above, the rim in the various preferred embodiments may be removably engaged with the carrier by a variety of mechanisms. In preferred embodiments 10,110, 210, and 310 it is provided respectively by shear cables 96, 196, 296, and 396. As a further example, and as shown in Figure 14A and 14B, such releasable coupling may be provided by radially displaceable clamps. More particularly, the spreader 410 comprises a sleeve 484 which is slidably supported on the inner surface of a housing 480. The spreader housing 480 is quite similar to the spreader housing 80. It comprises several ports 483 which are configured and sized to allow flow of displaced fluid during a cementing operation into the housing 480.

As will be appreciated from the comparison of Figures 14A and 14B, sleeve 484 is sustained for axial movement from an open, downward position where doors 483 are discovered by sleeve 484 as shown in Figure 14A, to a closed, installed position where sleeve 484 covers ports 483 as shown in Figure 14B. Sleeve 484 is removably connected to and operated by a transmission 490 which is similar to transmission 90 in the spreader 10. Transmission 490 comprises a conveyor 491 and a rim 492 which are removably engaged. In transmission 490, however, conveyor 491 and rim 492 are removably engaged by means of clamps 496.

Clamps 496 are carried in properly configured slots in annular space base 93 of rim 492. When the spreader 410 is in its downward position, as shown in Figure 14A, clamps 496 engage in annular space recess 499a in the 491, thereby engaging conveyor 491 and rim 492. After cementation, when the smooth joint 415 is lifted so that its ring 416 engages the dilated lower end 498 of conveyor 491, additional traction on the smooth joint 415 will cause the glove 484 moves upward to its closed position shown in Figure 14B.

When the transmission 490 has shifted upward to the point shown in Figure 14B where the sleeve 484 is in its closed position, the clips 496 will be aligned with the underside of an annular space recess 499b fitted to the inner surface of the housing. 480. Applying more upward force to work column 5 and flat joint 415 will therefore propel clamps 496 into recess 499b by disengaging conveyor 491.

The further upward movement of the flat joint 415 will move the swollen end 498 of the carrier 491 from position under the flexible projections of the rim 494 until it engages the bottom shoulder of the annular space 493 of the rim 492. At that point, the clamps 496 are aligned to an annular space recess 499c provided towards the lower end of the conveyor 491. Further upward movement of the flat joint 415 and the conveyor 491 will allow the clamps 496 to move to the recess 449c of the recess 499b in the housing 480 At the same time, as rim 494 projections can now be flexed internally, this upward movement will cause the enlarged rim ends 495 to leave the recesses in glove 484 and slits 485 to the inner surface of glove 484, thereby. disengaging sleeve 484 transmission 490. All transmission 490 can then be removed from flow disperser 410, leaving housing 480 with sleeve 484 retained in its closed position blocking flow through ports 483 as part of installed liner 2.

Furthermore, it is interesting that, although most preferred in view of the advantages discussed above, various aspects of the present invention may be practiced without the use of unpublished flow dispersers. For example, unpublished methods of installing a liner generally do not require the use of unpublished flow spreaders, they merely require a port to be provided on the liner below the fence established between the liner and annular space and preferably to be provided. some devices for closing the door after the cementing operation is completed.

[0208] 0Liner Assembly Operation [0209] The liner assembly 1 is mounted with the liner hanger 11, the anchor installation tool 3 and the flow spreader 10 in their downward positions. The assembly can then be lowered on the work column 5 to the existing casing 6, with or without rotation. If a liner is being installed, however, a drill bit is preferably attached to the end of the liner, as noted above, so that the liner can be drilled.

[0210] Work column 5 provides a fluid circulation duct according to the need for drilling or other well operations. It also provides axial and rotational force transmission as required to operate the installation tool 3, flow disperser 10, and other components of liner assembly 1. In this context, working column 5 will be understood to include not only the tubular members of which the liner assembly 1, but also the tool chuck 30, the flat gasket 15, and any other tubular or connectors that cooperate to provide a duct or transmit operating forces are suspended.

[0211] When the liner 1 assembly is positioned at the desired depth, the liner hanger 11 will be seated on the existing liner 6 and released, liner 2 will be cemented into the well, and the anchor 3 installation tool will be recovered from the well, according to the detailed description below.

The liner hanger 11 is seated by increasing fluid pressure within the mandrel 30. Thus, the liner assembly 1 preferably includes a ball seat (not shown) which is connected directly or via tubular connections to the smooth joint. 15 below the flow spreader 10 and the cement plug 14. A ball can be released through the work column 5 and rest freely on the ball seat. Once in the seat, the ball effectively closes the work column 5 and allows pressure to form above the ball. Once the liner hanger 11 is seated, the pressure is further increased to blow the ball past the seat.

[0213] The present invention, however, is not limited to such mechanisms. Other mechanisms, such as blow-down flap valves, may be provided for closing the work column and permitting pressure formation in an installation tool. The liner can also be cemented into the wellbore, and cement in the annular space will close the flow from the liner and allow pressure to increase in the working column to seat the anchor. As noted, however, there are important benefits to anchoring and releasing an anchor before it is cemented, which can be accomplished through preferred aspects of the present invention.

In any event, as the fluid pressure in the tool chuck 30 increases, the nesting tool 13 is actuated, pushing the mold 21 down and under the expandable sleeve 22. At the same time, the increase in the Fluid pressure in the mandrel 30 promotes the partial release of the descent tool 12 from the mandrel 30. Once the descent tool 12 is seated, the descent tool 12 can be released from the liner hanger 11 releasing the weight over the mandrel 30 through Alternatively, if no release occurs, the lowering tool 12 may be released from the liner hanger 11 by turning the mandrel 30 a quarter turn counterclockwise prior to weight release.

More particularly, as the fluid pressure in the mandrel 30 to actuate the seating tool 13 and seat the liner hanger 11 increases, the fluid accesses the lower hydraulic chambers 64 of the actuators 60 through the inlet ports 65 Increased fluid pressure in the lower hydraulic chambers 64 pushes the floating pistons 61 b down 61 f. Since not all floating pistons 61 and sleeves 62 are interconnected, this force is transmitted by all actuators 60, and whatever shear members employed in immobilizing actuators 60 are sheared, allowing actuators 60 to begin to travel. down. This downward movement in turn causes an increase in pressure in the upper hydraulic chambers 66, which ultimately violates the diaphragms 73, allowing fluid to flow through the balancing pistons 70. Continuous fluid flow to the lower hydraulic chambers 64 causes for actuators 60 to descend further. Provided that fluid communication has been established in the passages 72, the balancing pistons 70 are driven downward along the mandrel 30 with the floating pistons 61, as shown by comparing Figures 2A and 2B.

As the actuators 60 continue to move downward along the mandrel 30, as we can better observe by comparing Figures 3A and 3B, the shear pins connecting the adjusting ring 68 and the stop ring 69 are sheared. The lower end of the adjusting ring 68 then moves to engage the upper end of the stop ring 69, which in turn adjoins the mold 21. Thus, the downward force generated by the actuators 60 is sustained by the mold 21, causing its upward movement finally expanding the metal sleeve 22 radially outwardly in contact with an existing liner. Interestingly, ideally there is no movement, or reduced movement, of the liner hanger 11 relative to the existing liner as it is seated. Thus, a certain fraction of the weight may be released over the mandrel 30 to ensure that it is not driven upwards by the resistance faced when expanding the sleeve 22.

Finally, as noted above, increasing fluid pressure within the mandrel 30 not only causes the liner hanger 11 to settle, but also promotes partial release of the mandrel 30 lowering tool 12. More specifically , as best seen in the comparison of Figures 6A and 6B, increasing fluid pressure in mandrel 30 causes fluid to pass through one or more ports 51 in tubular section 31 g reaching a small hydraulic chamber 52 defined between the piston of locking 50 and annular space seals 53 fitted between piston 50 and section 31 g. As fluid flows into the hydraulic chamber 52, the locking piston 50 is driven upwardly along the tubular section 31g away from the clamp housing 47.

This movement of the locking piston 50 uncovers the recesses in the clamp housing 47. As discussed above, the clamps 48 may move radially (to some extent) within these recesses. Once discovered, however, the clamps 48 will be pushed out and disengaged from the tubular section 31 g if the mandrel 30 is moved downward. Thus, the lowering tool 12 is partially released from the mandrel 30 in the sense that the mandrel 30, although prevented from relative upward movement, can now move down relative to the lowering tool 12. However, one has knowledge of other clamping and releasing mechanisms, such as those which include one or a combination of mechanical or hydraulic mechanisms, and may be used in the lowering tool 12.

[0219] Once the liner 11 hanger is seated and any other desired operations are completed, the lowering and nesting tools 12 and 13 can be completely released from the liner 11 hanger by first moving them to their "release" positions. Figures 6C and 7C show the lowering tool 12 in its released position. As we will consider hereinafter, generally, the lowering tool 12 is released from the hanger 11 releasing the weight on the mandrel 30 by means of the working column 5 while the fluid pressure within the mandrel 30 is reduced. Thus, as the weight is released onto the mandrel 30 it begins to move downward and the seating tool 13, which is held steady by engaging it through the stop ring 69 with the upper end of the mold 21, can drive the mandrel 30 upwards.

As best seen in the comparison between Figure 6B and Figure 6C, clamps 48 can both radially displace and disengage from tubular section 31 g as discussed above, and as weight is released onto the liner assembly 1 the mandrel 30 is capable of moving downwardly relative to the lowering tool 12. An expanded C-ring 54 is carried on the outer surface of the tubular section 31 g in a groove in the clamp housing 47. As the mandrel 30 moves downward, the expanded C-ring 54 meets, and in part may extend and engage, another annular space groove in the tubular section 31 g, and thereby again engages the lowering tool 12 in the mandrel. The downward path of the mandrel 30 is preferably limited to facilitate this new engagement. Thus, an expanded C-ring and cover ring 55 assembly is mounted on the tubular section 31 g to engage the upper end of the clamp housing 47, interrupting the mandrel 30 and allowing the expanded C-ring 54 to engage the groove. compatible on tubular section 31 g.

Finally, as we will see better by comparing Figures 7B and 7C, the downward path of the mandrel 30 will also cause the lower ring 42 to shift downwards, thus removing the radial support of the rim ends 41. The descent tools and seating 12 and 13 can then be recovered by lifting the spindle 30 by means of the working column 5. As noted, the lowering tool 12 has been engaged with the spindle of the tool 30 again. It is also hoisted. The ends of the rim 41 are tapered so that it will be driven radially inwardly as it contacts the upper edges of the annular space recesses 29 in the hanger mandrel 20, thereby releasing the hanger lowering tool 12. The tool The seating plate 13 is carried on the mandrel 30.

[0222] If descent tool 12 is not released from mandrel 30 while liner hanger 11 is seated, it is interesting that it can be released by turning mandrel 30 a quarter turn counterclockwise and releasing in then the weight on the mandrel 30. That is, left “J” slots (not shown) are provided in the 31 g tubular section. These "J" slots are also known in the art and provide an alternative method of releasing the hanger mandrel descent tool 12. More specifically, clamps 48 can access the sides of the "J" slots when mandrel 30 is turned one quarter turn counterclockwise. After reaching the axial parts of the slots, the weight can be released over the mandrel 30 to move it down relative to the lowering tool 12. This downward movement will engage the lowering tool 12 again and remove the radial support from the ends. of rim 41 as described above. Preferably, shear ropes or other shear members are provided to impart certain resistance to this counterclockwise rotation to minimize the risk of inadvertent release.

[0223] Installation tool 3 can be retrieved from the well once it has been completely released from liner hanger 11 if desired. Preferably, however, as provided by other aspects of the present invention, the seal established between the existing liner and the liner hanger by the anchor is tested for pressure.

That is, as noted above, furthermore, the unpublished dispersors preferably incorporate a one-way seal, such as the suction cup 86 on the disperser 110 shown in Figure 10A. Suction cup 86 is mounted on flat gasket 15 at a point above doors 83 and provides a one-way seal between flat gasket 15 and housing 80. Suction cup 86 can be mounted on housing 80, and if this occurs, it is generally considered necessary to perform a drilling operation or provide a release mechanism so that the suction cup 86 can finally be removed from the spreader 110. In any event, the suction cup 86 allows fluid to flow out. through the housing 80 in an upward direction beyond the suction cup 86, but will substantially prevent fluid from flowing in the downward direction. Once the liner hanger 11 is seated, back pressure can be applied to the well to test the seal. That is, the pressure may be increased in the annular space between the working column 5 and the existing casing 6. The suction cup 86 will prevent fluid from flowing down between the flat gasket 15 and the housing 80. Thus, any loss pressure in the annular space (assuming the integrity of the existing liner) would indicate that no effective seal was established during the liner hanger seating 11.

[0225] Interestingly, the pressure test can be conducted before or after the installation tool is released from the liner hanger. Especially if a pressure test is conducted prior to the release of the liner hanger installation tool, repair or improvement of the seal by further manipulation of the installation tool may be feasible. Moreover, it is interesting that a one-way seal, such as a suction cup, can be provided at other points above the doors in the unpublished spreader. Not necessarily does this seal need to be arranged (in its downward position) between the smooth gasket and the housing of the unpublished dispersers. It may be located above the spreader in other parts of the liner.

As provided by other preferred aspects of the present invention, the liner can also be completely installed and cemented in a single downhole operation. In this way, the anchor is seated and sealed to an existing liner, and the installation tool is released and translated at a sufficient distance to provide a fluid flow path through the anchor.

That is, the tool chuck 30 and the flat joint 15 pass through the liner suspension 11 and the flow spreader 10 and allow the cement to be introduced into the liner 2 below the flow spreader 10. The plugging Cement 14 is incorporated into the liner assembly 1 below the flow spreader 10. It includes conventional packing elements that are disposed between its outer housing, which will be left in the well as part of liner 2, and the flat gasket 15, extended at your length. Cement plug 14 then establishes a seal around the smooth joint 15 that will prevent cement introduced through working column 5 from flowing above liner 2 to flow disperser 10. Cement plug 14 preferably has perforable packing. or, more preferably, recoverable packing by the smooth gasket 15. The packing may be seated or pre-seated. Being settable, the packing will be set before the cement is introduced into the well. Recoverable packing, if desired, could provide convenient expansion in the smooth joint 15 which could be used to actuate transmission 90 of the flow spreader 10 while the smooth joint 15 is lifted. A variety of conventional cement pads are commercially available and may be used in unpublished liner assemblies. The present invention is not limited to any particular buffering.

After the desired amount of cement has been introduced, additional fluids are pumped behind the cement "plug", usually separated by a rubber dart (not shown). The rubber dart will descend to working column 5 until it rests and rests on a rubber liner cap (not shown) that is attached to the end of working column 5. Continuous pumping will cause the rubber liner cap to descend beyond liner 2 and the cement plug below it to leak from the lower end of liner 2.

[0229] As the cement flows into liner 2 and the annular space space well it will displace the fluid already present in annular space space. These return fluids, however, are not able to flow directly above the annular space space to the surface as the liner hanger seating 11 will have established a coated annular space space seal 6. Instead, the returns will flow through the ports 83 on flow spreader 10 and back into liner 2.

[0230] Anchor 3 installation tool, when in its lowered position and even after release, substantially occupies the space between tool chuck 30 and liner hanger 11. Although not necessarily airtight, this will prevent flowing substantial volumes of fluid in either direction through liner assembly 3. Under any circumstances, installation tool 3 will not allow sufficient flow to accommodate the displaced fluid volume and flow during a typical cementing operation. Thus, prior to introducing the cement into the work column 5, the installation tool 3 will be completely released by any of the methods described above and lifted at a relatively short distance to provide a flow path through the liner hanger 11.

For example, the installation tool 3 may be pulled up to a point where the lowering tool 12 has released the mold 21, or at least the clamp housing 47 and the pressure cap 45 have welded the mold 21 At this point, an annular gap clearance will be established between the lowering tool 12 and the liner 6 and the mold 21. The smooth joint 15 will also have been lifted until it extends through the hanger mandrel 20 and the mold 21. As the smooth gasket 15 has an outside diameter smaller than the inside diameter of the hanger mandrel 20 and the mold 21, an annular space gap flow path will be created by the liner hanger 11 to the existing liner 6. Thus, the return fluids they may flow above the lower annular space through the flow 10 spreader, through the liner 2 and the liner hanger 11, to the liner 6, and finally to the surface. Interestingly, the smooth joint 15 is long enough and will still extend through the flow spreader 10 and cement plug 14 when the installation tool is lifted.

Once the cementation is complete, the doors 83 in the flow spreader 10 can be closed by pulling up the work column 5. As the work column 5 is pulled up, the ring 16 in the smooth joint 15 it will engage the lower end of conveyor 91 on flow spreader 10. Continued pull of work column 5 will first cause transmission 90 to lift spreader sleeve 84 and close ports 83 on flow spreader 10 and then release transmission. 90 of sleeve 84 and housing 80, all as detailed above. Once doors 83 and transmission 90 have been closed, transmission 90, installation tool 3, and the other components of the liner assembly in work column 5 can be recovered from the well. The housing 10 of the flow 10 spreader, its doors 83 which have been closed, remains in the well as part of liner 2. Thus, at this point it is possible not only to fully install a liner in the well in a single down operation, but also to ensure that the hanger was seated correctly, that an effective seal was established, and that the hanger was released before the liner was cemented.

[0233] Interestingly, the other preferred embodiments of unpublished dispersors can be used in substantially the same way, naturally considering that the spreader can be closed by different manipulations of the working column. For example, as discussed above with respect to preferred spreader 210, closing is accomplished by rotating the work column.

Although it has been disclosed and discussed primarily in terms of its specific embodiments, this invention is not limited thereto. Other modifications and modalities will be evidenced by the person skilled in the art.

Claims (28)

1. Method for installing and cementing a liner (2) in a well, the dilo method is characterized by the fact that it comprises: (a) lowering said liner (2) inside said well in a working column, (b) anchoring said liner (2) to a casing (6) in said well; (c) sealing said liner (2) to said existing liner (6), said sealing substantially preventing direct flow of fluid around said liner (2) to said liner (6) existing from the annular space between said liner (2) and said well; (d) releasing said liner (2) from said working column; (e) lifting said working column to provide a flow path within said liner (2); (f) after completing the preceding steps, injecting the cement into said liner (2) and allowing said cement to flow into said annular space; (g) returning fluid displaced from said annular space by said cement through a door in said liner (2), said door being disposed on the subsurface of said seal, and from said latter to said flow path established by said release of the said liner (2) and said lifting of said working column; and (h) withdrawing said working column out of said well. Method according to claim 1, characterized in that it is applied to a liner assembly (t) comprising: i) a liner (2), ii) an anchor (11) connected to said liner (2) said anchor (11) being in a non-seated position in which fluid can flow around said liner assembly (2) in the annular space between said liner assembly (1) and said well, iii) a tool (12) which removably engages said anchor (11), iv) a return flow disperser (10) connected to said liner (2) below said anchor (11) and having a port (83) allowing fluid communication of said annular space with said flow spreader (10), and v) a tubular duct (15) extended through said anchor (11), installation tool (12,13), and said flow spreader (10) and for said liner (2); further wherein: (a) said liner assembly (λ) is lowered into said well in said working column; (b) said installation tool (12, 13) is actuated to seat said anchor (11), said anchor (11) securing said liner (2) in said existing casing (6) of said well; (c) said actuation of said anchor (11) by said installation tool (12, 13) also seals said liner (2) in the liner (6) thereby substantially preventing direct flow of fluid around said assembly from the liner (1) of said annular space to said existing liner (6); (d) disengaging said installation tool (12,13) from said anchor (11); (e) lifting said installation tool (12, 13) away from said anchor (11) to provide a fluid flow path through said anchor (11) and around said duct (15); (f) injecting cement through said duct (15) into said liner (2) and annular space after said disengagement and lifting of said installation tool (12, 13) and allowing well fluid displaced by said cement to flow from the said annular space for said existing liner (6) via said spreader door (83) and said pathway provided by said disengaging and lifting of said installation tool (12,13). A method according to claim 2, characterized in that said return flow spreader (10) comprises a one-way seal (86) mounted above said spreader port (83). A method according to any one of claims 1 to 3, characterized in that said method further comprises testing the pressure of said liner seal by increasing the fluid pressure in said existing coating (6). A method of installing a liner (2) into a well, said method being applied to a liner assembly (1) comprising: i) a tubular (2) liner, ii) an anchor (11) connected to said liner (2), said anchor (11) being in a non-seated position in which fluid can flow around said liner assembly (1) in the annular space between said liner assembly (1) and said well, iii ) an installation tool (12, 13) detachably engaging said anchor (11), iv) a return flow spreader (10) connected to said liner (2) below said anchor (11) and having a port (83) allowing fluid communication from said annular space to said flow spreader (10), v) a tubular duct (15) extended through said anchor (11), installation tool (12,13), and from said flow spreader (10) and to said liner (2); and vi) a one-way seal (86) mounted between said tubular duct (15) and said liner (2) or said flow spreader (10) above said flow spreader port (83) and allowing that fluid flows upwardly through said seal in one direction (86) and preventing fluid from flowing downwardly after said seal in one direction (86); Said method is characterized by the fact that it comprises the steps of: (a) lowering said liner assembly (1) in said well; (b) actuating said installation tool (12, 13) to seat said anchor (11), said anchor (11) securing and sealing said liner (2) in an existing casing (6) of said well and this substantially impedes the direct flow of fluid around said liner assembly (1) from said annular space to said existing liner (6); and (c) pressure testing said seal established by seating of said anchor (11). Method according to any one of claims 2, 3 or 5, characterized in that said anchor (11) comprises an expandable tubular. Method according to any one of claims 2, 3 or 5, characterized in that said anchor (11) comprises an expandable sleeve (22). A method according to any one of claims 2, 3, or 5 to 7, characterized in that said liner assembly (1) includes a seal (14) for sealing the duct (15) in said liner at subsurface of said return flow disperser (10) and substantially impedes the direct flow of fluid around said duct (15). Method according to claim 8, characterized in that said duct seal (14) is pre-seated. A method according to claim 8, characterized in that said method comprises seating said duct seal (14). A method according to any one of claims 2, 3 or 5 to 10, characterized in that said return flow spreader (10) comprises i) a cylindrical body (80) defining said port (83) ii) a cover (84) mounted on said body (80), said cover (84) being movable from an open position, wherein said spreader door (83) is open, to a closed position, where the said spreader door (83) is closed, and iii) a transmission (90) operable to move said cover (84) from said open position to said closed position. 12. Return flow disperser adapted to permit return flow during cementation of a liner to a well, said return flow disperser is characterized by the fact that it comprises: (a) a cylindrical body (80) adapted for installation in said well as part of said liner (2), said cylindrical body (80) having a fluid port (83) adapted therein to allow cement-displaced fluids injected into said well to flow from an annular space between said liner (2) and said well to said cylindrical body (80); (b) a cover (84) supported on said cylindrical body (80) for movement after said cement injection from an open position, wherein said door (83) is open, to a closed position, where said door (83) is closed by said cover (84); (c) a transmission (90) disposed within said cylindrical body (80) and defining a cylindrical passageway, said transmission (90) being removably connected to said cover (84) and operable to move said cover (84) of the said open position to said closed position; wherein said transmission (90) is slidably supported around a tubular duct (15), (d) said tubular duct (15) disposed in said cylindrical passageway and extending through said cylindrical body (80), said tubular duct (15) being adapted to inject cement into said liner (2) below said body (80). Return flow disperser according to claim 12, characterized in that said transmission (90) is slidably supported on said tubular duct (15). Return flow disperser according to claim 12 or 13, characterized in that said cover is a cylindrical sleeve (84) sustained for axial movement through the outer surface of said cylindrical body (80) of said position. open to said closed position. Return flow disperser according to claim 12 or 13, characterized in that said cover is a cylindrical sleeve (84) sustained for axial movement through the inner surface of said cylindrical body (80) of said open position to said closed position. Return flow disperser according to claim 12 or 13, characterized in that said cover (84) is a cylindrical sleeve (284) sustained for rotational movement from said open position to said closed position. . Return flow disperser according to any one of claims 12 to 16, characterized in that said transmission (90) comprises a cylindrical conveyor (91), said conveyor (91) being adapted to receive and be supported on said tubular duct (15) such that said tubular duct (15) is capable of translational movement therein, and a rim assembly (92), said rim assembly (92) being removably engaged with said conveyor. (91) and removably engaging said cover (84). Return flow disperser according to claim 17, characterized in that said cylindrical body (80) defines one or more slots (85), said cover is a cylindrical sleeve (84) sustained for movement. axially through the outer surface of said cylindrical body (80) from said open position to said closed position, and said transmission (90) comprises a cylindrical conveyor (91) adapted to support said rim assembly (92); said rim assembly (92) being removably engaged with said conveyor (91) and removably engaging said cover (84) through said slots (85). Return flow disperser according to any one of claims 12 to 18, characterized in that said flow disperser comprises a one-way seal (86) mounted above said fluid port (83). 20. Liner assembly adapted to permit return flow during cementation of said liner assembly in a well, said liner assembly is characterized by the fact that it comprises: (a) an anchor (11) adapted to secure said liner liner assembly (1) in said well and having a non-seated position in which fluid may flow around said liner assembly (1) when said liner assembly (1) is lowered into a well, (b) an installation tool (12,13) that removably engages said anchor (11) and adapted to seat said anchor (11) on an existing casing (6) of said well, and (c) the flow disperser as defined in any one of claims 12 to 19. 21. Liner assembly to permit return flow during cementation of said liner assembly in a well, said liner assembly is characterized by the fact that it comprises: (a) a liner (2); (b) an anchor (11) adapted to secure and seal said liner (2) to said well, (c) an installation tool (12, 13) that removably engages said anchor (11) and adapted to seat said liner (2). anchor (11) and seal said liner (2); and (d) a flow dispersing tool (10) for installation in said well as a component of said liner, said flow dispersing tool having i) a cylindrical body (80) defining a port (83) adapted to allow that the cement-displaced fluids injected into said well flow from an annular space between said liner (2) and said well to said tool (10); ii) a cover (84) mounted on said body (80); said cover (84) being movable after said cement injection from an open position where said door (83) is open to a closed position where said door (83) is closed, and iii) a transmission (90) operable to move said cover (84) from said open position to said closed position; said transmission (90) being slidably supported around a tubular duct (15); (d) said tubular duct (15) extending through said transmission (90) and said cylindrical body (80), said tubular duct (15) being adapted to inject cement into said liner (2) below said body (80). Liner assembly according to claim 21, characterized in that said transmission (90) is slidably supported on said tubular duct (15). A liner assembly according to claim 21 or 22, characterized in that said cover is a cylindrical sleeve (84) sustained for axial movement through the outer surface of said cylindrical body (80) from said open position. said closed position. Liner assembly according to claim 21 or 22, characterized in that said cover is a cylindrical sleeve (184) sustained for axial movement through the inner surface of said cylindrical body (80) of said open position. to said closed position. Liner assembly according to claim 21 or 22, characterized in that said cover is a cylindrical sleeve (284) sustained for rotational movement from said open position to said closed position. Liner assembly according to any one of claims 20 to 25, characterized in that said transmission (90) comprises a cylindrical conveyor (91), said conveyor (91) being adapted to receive and be held on the said tubular duct (15) such that said tubular duct (15) is capable of translational movement therein, and a rim assembly (92), said rim assembly (92) being releasably engaged with said carrier (91) and removably engaging said cover (84). Liner assembly according to Claim 26, characterized in that said cylindrical body (80) defines one or more slots (85), said cover is a cylindrical sleeve (84) sustained for axial movement through said outer surface of said cylindrical body (80) from said open position to said closed position, and said transmission (90) comprises a cylindrical conveyor (91) adapted for holding said rim assembly (92), said assembly of the ring (92) being removably engaged with said conveyor (91) and that removably engaging said cover (84) through said slots (85). Liner assembly according to any one of claims 20 to 27, characterized in that said flow dispersing tool (10) comprises a one-way seal (86) mounted above said door (83) .