RU2753915C1 - Self-contained downhole packer - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to equipment for the oil and gas industry and can be used for long-term hermetic separation of the intervals of the production column of both the injection well and the production oil or gas cased well, and protecting it from the dynamic impact of the working environment during various technological operations. The packer contains a trunk, sealing elements installed on the trunk, a mechanical anchoring device that includes interacting slips and cones with shear elements. Under the mechanical anchoring device there is a power drive consisting of a housing attached to the trunk by means of a thread, the lower part of which is made with splined grooves on the inner surface, a sleeve connected to the housing by means of dowels, and a bearing installed between the lower cone and the sleeve. A ring is installed on the trunk, the upper annular protrusion of which is located in the inner annular groove of the lower cone, and the lower annular protrusion is installed with the possibility of interaction with the inner protrusion of the sleeve. The upper and lower cones are equipped with guide screws, the upper parts of which are installed respectively in the upper and lower longitudinal grooves of the casing of the mechanical anchoring device, the sealing elements are installed above the mechanical anchoring device, and a connecting housing is installed in the upper part of the packer, the inner surface of which is made with the possibility of connection with the installation tool.

EFFECT: increased operational reliability of the packer.

3 cl, 2 dwg

Description

The invention relates to equipment for the oil and gas industry and can be used for long-term hermetic isolation of the intervals of the production string of both an injection well and a production oil or gas cased well, and protecting it from the dynamic effects of the working environment during various technological operations, for example, when repetitive technological operations associated with the creation of pressure and pumping of fluid with alternating pressure drop during one set of the packer; for separation of reservoirs with simultaneous-separate operation and simultaneous-separate injection; for long-term autonomous isolation of the damaged section of the production casing and other technological operations for a long time, in which there is a cyclic pressure drop across the packer.

Known mechanical packer containing a barrel, a coupling, a ram mechanism in the form of a lantern with spring-loaded dies and anchor dies, upper and lower expanding cones, a seal. It is equipped with an adapter and an extension, connected by shear elements with each other and with the barrel, spring-loaded rusks installed in a groove made in the barrel below the sub, a sleeve enclosing the adapter and spring-loaded rusks, a sleeve covering the sleeve, enclosing the stem with a landing cone having a bearing and connected to the lower end of the sleeve, by a telescopic rod surrounded by a seal, and telescopically connected to the upper expanding cone and the landing cone, forming a tight threaded connection with the barrel with a lock sleeve covering the connecting sleeve. The adapter is connected to the upper end of the glass with a telescopic connection, and grooves are made in the end of the barrel, which include the counter protrusions of the extension (RF patent No. 2294427, IPC E21B 33/12, published on February 27, 2007).

The disadvantage of this technical solution is the unreliability of sealing with one sealant in case of contact with the casing, which has defects on the inner surface. The disadvantages also include the complexity of the manipulations necessary to retrieve the packer, in addition, when they are carried out, there is a risk of both the production tubing being unbolted from the packer and the disconnection of individual tubing pipes.

Known packer plug containing a borehole with an annular ledge and a collar, a plug, an annular seal with upper and lower stops, slips and cones, a compressed annular seal retainer, a buffer sleeve and a springy ring placed in its bore interacting with annular notches on the barrel. The cones are fixed to the barrel with shear pins and dowels. The upper key is connected to the cone by a locking screw with the ability to move by the compression length of the O-ring. The upper slips are adjacent to a sleeve connected to a buffer sleeve. An inner cone is made at the end of the coupling, interacting with the outer cone on the spring ring of the retainer. The lower slips are adjoined to the shoulder of the spacer sleeve, mated with the inner diameter of the annular ledge. Openings are made under the skirt of the plug in the annular ledge, in which shear pins are installed to connect the barrel with the fixation unit on the mounting tool rod (RF patent No. 2537713, IPC E21B 33/128, E21B 23/06, published on 01/10/2015).

The disadvantage of this technical solution is the risk of complications caused by dusting the packer with mechanical impurities, which prevents the process of deactivation of the packer if it is necessary to remove the packer-plug, namely, prevents the return of the slips from the working position to the transport position.

The technical result of the proposed invention is to increase the operational reliability of the downhole autonomous packer by providing a simple and trouble-free transfer of the packer both to the working position and to the transport position without resting on the bottomhole, by rotation with the setting tool, with simultaneous high-quality fixation of the packer in the well in the autonomous position , as well as with the possibility of running the packer both on coiled or simple tubing (tubing), and on geophysical cable.

The specified technical result is achieved in an autonomous borehole packer containing a borehole, sealing elements installed on the borehole, a mechanical anchoring device including interacting slips and cones with shear elements, while, according to the invention, a power drive is located under the mechanical anchoring device, consisting of an attached to the barrel using the body thread, the lower part of which is made with spline grooves on the inner surface, the bushing connected to the body by means of keys, and a bearing installed between the lower cone and the bushing, while a ring is installed on the barrel, the upper annular protrusion of which is located in the inner annular groove of the lower cone, and the lower annular protrusion is installed with the possibility of interaction with the inner protrusion of the sleeve, in addition, the upper and lower cones are equipped with guide screws, the upper parts of which are installed, respectively, in the upper and lower longitudinal grooves the casing of the mechanical anchoring device, the sealing elements are installed above the mechanical anchoring device, and a connecting casing is installed in the upper part of the packer, the inner surface of which is designed to be connected with the setting tool.

In addition, a poppet check valve is installed at the bottom of the packer.

In addition, the slips of the mechanical anchoring device are double-sided with centrally located springs or elastic plates.

Figure 1 shows a diagram of an autonomous downhole packer in a transport position. Figure 2 shows a section a-a in figure 1.

An autonomous downhole packer contains a borehole 1 (Fig. 1) with installed on it in the direction from top to bottom: a seal unit, a mechanical anchoring device and a power drive of the packer.

The seal unit consists of sealing elements 2 with spacer rings 3. In this case, the sealing elements 2 can be made of special rubber to ensure better sealing of the annular space. The location of the seal assembly above the mechanical anchoring device allows, when deactivating the packer, to avoid complications caused by dusting the packer with mechanical impurities.

The mechanical anchoring device consists of slips 4, upper cone 5 and lower cone 6, casing 7, springs 8, guide screws 9 (figure 2), upper shear elements 10 and lower shear elements 11. Mechanical anchoring device is designed to install the packer in the well and keeping it from moving both down and up. Slips 4 are inserted into special grooves of the casing 7 and can be made double-sided with springs 8 located in the center of slips 4, which ensure that the slips 4 are pressed against the borehole 1 and that the slips 4 are in the transport position when the packer is lowering or lifting. The springs 8 can be made in the form of a conical or cylindrical spring, or instead of the springs 8, elastic plates or pushing elements can be installed (not shown in the figure). In the holes of the upper cone 5 and the lower cone 6 screws 9 are installed (Fig. 2), the upper parts of which are installed, respectively, in the upper and lower longitudinal grooves (not shown in Fig.) Of the casing 7. The screws 9 serve as guides for the upper and lower longitudinal grooves in the casing 7, as well as for orientation of the casing 7, slips 4, upper 5 and lower 6 cones between each other. The upper cone 5 is connected to the barrel 1 by means of the upper shear elements 10. The lower cone 6 is connected to the casing 7 by means of the lower shear elements 11. The upper 10 and lower 11 shear elements are designed to hold the mechanical anchoring device in the transport position up to a certain load and to exclude it premature transfer to the working position.

The power drive, located under the mechanical anchoring device, consists of a housing 12, keys 13, a bushing 14 and a bearing 15. The power drive is designed to transmit torque from the setting tool (not shown in the figure) and then convert the torque, depending on the direction rotation of the setting tool, either in an axial compressive force, which translates the packer into the working position, or in the force, translates the packer into the transport position. The bearing 15 is installed between the lower cone 6 and the sleeve 14 and is designed to eliminate torque on the lower cone 6 during the installation or removal of the packer. The bearing 15 can be in the form of a rolling bearing or other replacement unit with similar functions. The pins 13 are installed in the keyways of the body 12 and the holes of the sleeve 14, designed to transmit torque from the body 12 to the sleeve 14. The keys 13 are protected from falling out by a cover 16 attached to the sleeve 14.

The body 12 of the power drive is attached by means of a thread to the barrel 1 with the possibility of transmitting torque from the setting tool (not shown in the figure) when the packer is transferred to the working or transport position, for which the lower part 17 of the body 12 is made with slotted grooves 18 on the inner surface ...

To ensure the transfer of the packer to the transport position, a ring 19 is installed on the borehole 1, the upper annular protrusion 20 of which is located in the inner annular groove of the lower cone 6, and the lower annular protrusion 21 is installed to interact with the inner protrusion of the sleeve 14.

The barrel 1 in the upper part is made with a tubing thread or any other thread for a tight connection with the connecting body 22. The connecting body 22 has special grooves and spline grooves 23 on the inner surface for connection with the setting tool and the possibility of running the packer as on coiled or simple tubing. and on a geophysical cable, and for connection with a docking tool (not shown in the figure).

A poppet check valve 24 can be installed in the lower part of the packer to seal the inner cavity of the packer from the pressure drop from the bottom to the top. A bleed valve 25 may be installed in the check valve disc 24 to equalize the pressure when the check valve 24 is opened.

An autonomous downhole packer operates as follows.

The packer is lowered into the well on a geophysical cable, tubing or coiled tubing together with a setting tool (not shown) attached to the connecting body 22 of the packer by means of special grooves and spline slots 23. An electric drive is installed above (not shown). Using an electric drive, the rod of the setting tool is rotated, the lower part of which, interacting with the spline grooves 18 of the lower part 17 of the body 12 of the power drive, transmits the torque and rotates the body 12. Then, by means of the power drive of the packer, the torque is converted into an axial compressive force, and as a result compressive load directed to the lower cone 6 from the body 12 through the sleeve 14, the destruction of the lower shear elements 11 occurs. The lower cone 6, moving upward relative to the casing 7, goes under the lower part of the slips 4, while the guide screws 9 of the cone 6 move to the upper part the lower longitudinal groove of the casing 7. Further, the upper cone 5, moving downward relative to the casing 7, goes under the upper part of the slips 4, while the guide screws 9 of the cone 5 move into the lower part of the upper longitudinal groove of the casing 7. The slips 4 are extended radially until secure engagement with the inner wall of the production string s (in Fig. not shown). With further rotation of the housing 12 and the increase in the axial compressive load, the upper shear elements 10 are destroyed, the sealing elements 2 are compressed and the annular space is sealed. Thus, the packer is transferred to the working position without resting on the bottom hole and its reliable fixation in the well.

After the packer is installed, the setting tool is removed from the well and the packer remains autonomously installed in the well. If necessary, during operation, the packer is docked with a docking tool for carrying out various technological operations through the inner passage of the packer, for example, such as treatment of the bottomhole formation zone, long-term operation of the well both in the flowing production method and in the artificial lift method using the installation electric centrifugal pump or installation of a sucker rod pump or while maintaining reservoir pressure. When the docking tool is installed, the poppet check valve 24, if present, is opened.

If necessary, the packer is removed from the well by docking with the setting tool and transferring the packer to the transport position in the reverse order, by rotating the body 12 in the opposite direction than during installation. In this case, the housing 12 and the sleeve 14 move downward relative to the barrel 1. The inner protrusion of the sleeve 14 interacts with the lower annular ledge 21 of the ring 19 and pulls it down, and the ring 19, in turn, removes the lower cone 6 from under the slips 4. Further rotation of the body 12 leads to the exit from the interaction of the upper cone 5 with the slips 4. The guide screws 9 of the upper 5 and lower 6 cones move to their initial position in the longitudinal grooves of the casing 7. Further, when the upper cone 5 moves down relative to the barrel 1, the sealing elements 2 pass into transport position.

Thus, the proposed technical solution makes it possible to increase the operational reliability of the packer by providing a simple and trouble-free transfer of the packer both to the working position and to the transport position without resting on the bottomhole, by rotation with the setting tool, with simultaneous high-quality fixation of the packer in the well in an autonomous position. , as well as with the possibility of running the packer both on coiled or simple tubing, and on geophysical cable.

Claims (3)

1. A self-contained borehole packer containing a borehole, sealing elements installed on the borehole, a mechanical anchoring device, including interacting slips and cones with shear elements, characterized in that a power drive is located under the mechanical anchoring device, consisting of a power drive attached to the borehole by means of a thread a housing, the lower part of which is made with spline grooves on the inner surface, a bushing connected to the housing by means of keys, and a bearing installed between the lower cone and the bushing, while a ring is installed on the barrel, the upper annular protrusion of which is located in the inner annular groove of the lower cone , and the lower annular protrusion is installed with the ability to interact with the inner protrusion of the sleeve, in addition, the upper and lower cones are equipped with guide screws, the upper parts of which are installed respectively in the upper and lower longitudinal grooves of the casing of the mechanical anchoring device, seals the elements are installed above the mechanical anchoring device, and a connecting body is installed in the upper part of the packer, the inner surface of which is designed to be connected to the setting tool. 2. Packer according to claim 1, characterized in that a poppet check valve is installed in the lower part of the packer. 3. Packer according to claim 1, characterized in that the slips of the mechanical anchoring device are double-sided with springs or elastic plates located in the center.

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