RU64682U1 - DEVICE FOR INSTALLATION AND SEALING OF A HOLE OF A CASING HOLE IN A WELL - Google Patents

Abstract

The proposal relates to the field of fastening oil and gas wells, and in particular to devices for lowering and sealing the annular space of the casing strings and, in particular, the casing stems.

The device includes a hollow body, a disconnector, and an associated shipping column. A packer and an anchor are installed in the upper part of the hollow body. The disconnector is connected to the hollow body by a left-hand thread. The packer pressure sleeve is mounted axially movable in the upper part of the hollow body. The shank is made in the form of a filter column, in the upper part of which a perforated pipe is located. The drillable plug is sealed between the shank and the perforated nozzle.

The non-return valve is made in the form of an elastic sleeve mounted on the outside of the perforated nozzle, blocking its openings and having the possibility of radial expansion outward, while the elastic sleeve is rigidly fixed from below to the perforated nozzle. The cork plug is located in the shipping column.

The disconnector from the bottom is equipped with a hollow pipe and a hollow rod with radially openings from the bottom that is telescopically installed into it from below. The hollow pipe in the lower part is equipped with radial holes that have the ability to seal the hollow rod. The hollow rod has the ability to interact with the drilled plug in the working position.

The anchor is made in the form of dies spring-loaded inside, mounted on a hollow cylinder concentrically mounted on a hollow body with the possibility of axial and rotational movement by means of spring centralizers interacting with the inner walls of the casing installed outside the hollow cylinder and the guide pin rigidly connected to the hollow body and placed in a through figured groove made in the lower part of the hollow cylinder.

The through figured groove consists of a short and long groove, with the upper part of the short groove connected to the middle part of the long groove. From the bottom, the packer press sleeve is provided with a conical surface, tapering from top to bottom and having the ability to interact with the dies of the anchor in the working position, in which

the guide pin is located in a long groove through the curly groove. In the transport position, the guide pin is in the short groove of the through figured groove.

The device for installing and sealing the casing liner has a simple design, which increases the reliability of the device, and the reduction in the complexity of the work is associated with a reduction in the number of drilled parts and technological operations in the well when installing and sealing the casing liner, which saves significant material and financial costs.

1 ill. for 1 liter

Description

The proposal relates to the field of fastening oil and gas wells, and in particular to devices for lowering and sealing the annular space of the casing strings and, in particular, the casing stems.

A device for installing and sealing a liner of a casing string in a well is known (RF Patent No. 2171366, ЕВВ 43/10, 33/14 publ. 07/27/2001), including a housing, a transport string connected thereto, a disconnector, a packer and an anchor, placed in the upper part of the shank, a nozzle with radial openings connected to the housing, forming an annular cavity with a shank in its upper part, hydraulically connected to the nozzle cavity through its radial openings and with nodes when the armature, packer and disconnector are connected, connected to the shank and a throttle shutoff valve located under the radial holes to shut off the internal section of the nozzle at a given flow rate with predetermined rheological properties, including a cylindrical sleeve with a seating seat in the lower part and a rod spring-loaded relative to the sleeve and forming an annular calibrated channel with it, and the pipe is made with the possibility extracting it from the well with a body and a transport column, and the liner under the device is made in the form of a filter column with holes in the upper part Part for displacing cement slurry.

The disadvantage of this device are:

- firstly, low reliability associated with the fact that any fluids injected into the well (drilling and grouting fluids, buffer fluid, etc.) have various foreign inclusions in their volume, which can be throttled during injection a valve with an annular calibrated channel and stuck in it, and this will not allow the throttle-shut-off valve to close, which will lead to the impossibility of increasing the pressure in the cavity of the pipe and the failure of the mechanisms of the disconnector, packer and anchor;

- secondly, high requirements for the properties of the grouting mortar (viscosity, specific gravity), due to the fact that in order to operate the butterfly valve, it is necessary to pump the grouting grout with the specified rheological properties through the device. And it is rather laborious to ensure on the surface even by preliminary leveling the properties of the cement slurry in its entire volume, reaching

sometimes several tens of cubic meters, since for this it is necessary to have on the surface a certain number of tanks with hydraulic or mechanical mixers. Operating time for thorough mixing of the entire volume of liquid may take several hours. Since the process of preparing grouting mortar is limited by the time factor due to its setting, it is possible that the required rheological properties will not be obtained in the entire volume of grouting mortar, therefore, if some volume of mortar with slightly different properties is pumped through the throttle-shut-off valve, for example, with higher viscosity and specific gravity, this will lead to the closing of the butterfly valve and the premature operation of the disconnector, packer and i.

The closest in technical essence is a device for installing and sealing a casing liner (RF Patent No. 2266391, IPC 7 Е21В 33/14 publ. In Bull. No. 35, dated December 20, 2005), including a hollow sectional casing, a disconnector and associated a transport column, a packer, in the upper part connected to the disconnector, and in the lower part - with an anchor, and the shank is made in the form of a filter column, in the upper part of which there is a perforated nozzle for displacing the cement slurry, while between the shank and the perforation The drill pipe also has a drillable plug installed, as well as a drillable valve-stop assembly installed in the lower section of the housing between the armature and the perforated pipe and includes a check valve, a seat coupling that interacts with a two-piece push-pull plug, the lower section of which has a through channel and is connected with a shear pin with a disconnector, and a landing sleeve connected to the landing sleeve with a shear pin and interacting with a ball discharged into the transport column, the extender is mounted on the upper section of the housing with the possibility of rotation, interacting with it without longitudinal movement, and is connected by a left-hand thread to the presser sleeve of the packer, which is mounted on the upper section of the housing with the possibility of longitudinal movement and connected with it by a key connection.

The disadvantages of this device are:

- firstly, the complexity of the design, due to the large number of nodes and parts, such as a sectional casing, two-section corking plug, valve-locking unit and so on;

- secondly, the process of installing and sealing the liner in the casing is complicated, since there are many intermediate operations that require a significant investment of time and a strict sequence

in work, the violation of which may lead to the need to quickly remove the liner from the well to prevent an accident in the form of sticking, and then after drilling the cement nozzle remaining in the well, repeat the operation of installing and sealing the casing liner in the well;

- thirdly, the high complexity of work associated with a large number of parts to be drilled (drillable non-return valve, fit sleeve, fit sleeve, and so on) after cementing the liner in the casing of the well.

The objective of the utility model is to simplify the design of the device, as well as reducing the complexity and reduction of technological operations in the well when installing and sealing the liner of the casing string.

The problem is solved by a device for installing and sealing the liner of the casing string, including a hollow body, a disconnector and an associated transportation string, a packer and an anchor installed in the upper part of the hollow body, a disconnector with a left-hand thread, a push sleeve installed in the upper part of the hollow body with the possibility of axial movement, the shank, made in the form of a filter column, in the upper part of which is a perforated nozzle for displacing cement slurry, drilled obku disposed between the liner and the perforated pipe, squeezing stopper that is installed in the transport column, valve-locking assembly configured as a check valve.

What is new is that the non-return valve is made in the form of an elastic sleeve mounted on the outside of the perforated pipe and having the possibility of radial expansion to the outside, with the flexible sleeve from the bottom being rigidly fixed to the perforated pipe and the disconnector with the left thread connected to the upper end of the casing, and provided with a hollow bottom a pipe and a hollow rod telescopically mounted in the bottom from there with radial holes at the bottom, and the hollow pipe at the bottom is equipped with radial holes having hermetic overlap of the hollow rod, which has the ability to interact with the drilled plug in the working position, while the anchor is made in the form of spring-loaded dies mounted on the hollow cylinder concentrically mounted on the hollow body with the possibility of axial and rotational movement by means of spring centralizers mounted outside the hollow a cylinder and a guide pin rigidly connected to the hollow body and placed in a through figured groove made in the lower part of the hollow cylinder, than through-shaped recess consists of a short and long bores, wherein the upper part of the short bore is connected with the middle part

a long groove, and the packer pressure sleeve from the bottom is provided with a conical surface, tapering from top to bottom and able to interact with the anchor dies in the working position, in which the guide pin is in the long groove of the through figured groove, while in the transport position the guide pin is in the short groove of the through curly groove.

The figure 1 shows a General view of the device in its original position.

The figure 2 shows a view of a through curly groove.

The device includes a hollow body 1 (see Fig. 1), a disconnector 2 and an associated transport column 3. In the upper part of the hollow body 1, a packer 4 and an anchor 5 are installed. The disconnector 2 is connected to the hollow body 1 by a left-hand thread 6. Pressure sleeve 7 packer 4, installed with axial movement in the upper part of the hollow body 1. The shank 8 is made in the form of a filter column, in the upper part of which there is a perforated pipe 9 with holes 10 for displacing grouting mortar. Drill plug 11 is tightly installed between the shank 8 and the perforated nozzle 9.

The non-return valve is made in the form of an elastic sleeve 12, rigidly fixed on the perforated pipe 9 from below, blocking its openings 10 and having the possibility of radial expansion outward. The cork plug 13 is located in the transport column 3.

The disconnector 2 from the bottom is equipped with a hollow pipe 14 and a hollow rod 15 telescopically mounted into it from below with radial holes 16 from the bottom. The hollow pipe 14 in the lower part is equipped with radial holes 17, which have the ability to tightly overlap the hollow rod 15. The hollow rod 14 has the ability to interact with the drillable plug 11 in the working position.

The anchor 5 is made in the form of dies 18 spring-loaded inside, mounted on the hollow cylinder 19, concentrically mounted on the hollow body 1 with the possibility of axial and rotational movement by means of spring centralizers 20 mounted outside the hollow cylinder 19, and interacting with the inner walls of the casing (in FIG. not shown) and a guide pin 21, rigidly connected to the hollow body 1 and placed in a through curly groove 22, made in the lower part of the hollow cylinder 19.

The through figured groove 22 (see FIG. 2) consists of a short 23 and a long 24 grooves, the upper part of the short groove 23 is connected to the middle part 25 of the long groove 24. From the bottom, the pressure sleeve 7 of the packer 4 is provided with a conical surface 26, tapering from top to bottom and having the ability to interact with dies 18 anchors 5 in the working

the position in which the guide pin 21 is in the long groove 24 of the through figured groove 22.

In the transport position, the guide pin 21 is in the short groove 23 of the through figured groove 22.

The shank 8 and the hollow body 1 with the perforated pipe 9 are connected by means of couplings 27 and 28, respectively.

Auxiliary fasteners are not indicated in the figure.

A device for installing and sealing the liner casing in the well works as follows.

Before the device is lowered into the well, it is assembled, as shown in the figure. Before the device is lowered into the well, it is assembled (see Fig.), While the lower end of the hollow rod 15 interacts with the drillable plug 11, and the radial holes 17 of the hollow pipe 14 are sealed by the hollow rod 15.

Next, the device is in the transport position (the guide pin 21 is located in the lower part of the short groove 21 of the through-shaped groove 22, as shown in the figure) on the transport column 3 is lowered into the well, periodically producing topping up the liquid in the pipes of the transport column 3.

After the liner 8 is lowered into the required interval of the casing in the well, the transport casing 3 is lifted up to a length greater than the length of the short groove 23 of the through-shaped groove 22 (about 0.5 meters), and then turned half a turn and lowered down partially unloading the device by about 10-15 kN.

As a result of the manipulations, the guide pin 21 first moves from the lower part to the upper part of the short groove 23, and then to the middle part 25 of the long groove 24 and then to the lower part of the long groove 24 of the through figured groove 22, while the anchors 5 spring-loaded inside the plate 18 enter in interaction with the conical surface 26 of the pressure sleeve 7 and pressed against the inner walls of the casing, as a result of which the device is fixed in the casing in a predetermined interval of the well.

Then, by injecting the required volume of grouting mortar from the surface, the wellbore is cemented in the interval from the reservoir, that is, from the shank 8 to the upper end of the disconnector 2. After grouting grouting is pumped into the transport column 3, a squeeze plug 13 is moved and it is pumped with buffer fluid through the transport column 3 until the cork plug 13 is planted on the upper end of the hollow rod 15, while the grouting fluid is displaced by the cork plug 13 from the transport 3 through hollow Lonna

the rod 15 and the radial holes 16 of the latter and then through the holes 10 of the perforated pipe 9, expanding the check valve radially outward, made in the form of an elastic sleeve 12 into the space between the liner 8 and the casing of the well. At the same time, the drillable plug 11 prevents the cement slurry from entering the cavity of the liner 8, made in the form of a filter column, and, therefore, into the interval of the productive formation of the open wellbore, which allows to save the permeability of the reservoir.

For more reliable sealing of the annular space between the device and the casing, the packer 4 is activated, for which the device is completely unloaded to the anchor 5, fixed on the inner walls of the casing. As a result, the anchors 5 spring-loaded inside the die 18 are pressed even more strongly against the inner walls of the casing, while the pressure sleeve 7 moves upward relative to the hollow body 1 and compresses the packer 4, which expands radially and comes into contact with the inner walls of the casing, displacing the cement slurry from the annular space between the packer 5 and the casing wall, while the guide pin 21 is moved to the top of the long groove 24 of the through figured groove 22. After that, the shipping columns at 3 s, the mouth is rotated clockwise, while the disconnector 2 is turned away from the hollow body 1.

After the disconnector 2 is completely unscrewed from the hollow body 1, they will be disconnected, after which the transport column 3 with the disconnector 2, the hollow pipe 14 with the hollow rod 15 at the end is lifted by 3-5 meters, while the hollow rod 15 goes out of interaction with the drillable plug 11.

Then, buffer liquid is pumped from the surface into the transport column 3, while the squeeze plug 13 moves down together with the hollow stem 15 until the hollow stem 15 stops, with the upper end facing the lower end of the hollow nozzle 14, while the hollow stem 15 is telescopically mounted in the hollow nozzle 14 down and open the radial holes 17 of the hollow pipe 14.

The result is a circulation of fluid through the transport column 3 and the radial holes 17 of the hollow pipe 14 at the wellhead.

By circulating the liquid, the remains of the cement slurry are washed over the device, after which the transport column 3 with the disconnector 2 and the hollow pipe 14 with the hollow rod 15 connected to it is removed from the well.

Then, after hardening the cement slurry and the formation of cement stone in the annular space between the device and the wellbore, a drill string with a drill bit (not shown) is drilled into it and the cork plug is drilled

13 with a drillable plug 11, ensuring the connection of the internal cavities of the hollow body 1 and the shank 8. After that, the drill string with a bit is removed from the well.

The device for installing and sealing the casing liner has a simple design, which increases the reliability of the device, and the reduction in the complexity of the work is associated with a reduction in the number of drilled parts and technological operations in the well when installing and sealing the casing liner, which saves significant material and financial costs.

Claims (1)

A device for installing and sealing a casing liner, including a hollow body, a disconnector and an associated transportation column, a packer and an anchor installed in the upper part of the hollow body, a left-hand disconnector, a push sleeve installed in the upper part of the hollow body with axial movement , a shank made in the form of a filter column, in the upper part of which there is a perforated nozzle for displacing cement slurry, a drillable plug installed between the tailings with a perforated nozzle and a perforated nozzle, a squeeze plug installed in the transport column, a valve-shutter assembly made in the form of a check valve, characterized in that the check valve is made in the form of an elastic sleeve mounted outside the perforated pipe and having the ability to radially expand outward, moreover, an elastic sleeve the bottom is rigidly fixed with a perforated pipe, and the left-hand disconnector is connected to the upper end of the housing, and at the same time it is equipped with a hollow pipe and a telescopic bottom a hollow rod installed in it from below with radial holes at the bottom, and the hollow pipe in the lower part is equipped with radial holes that can be sealed with a hollow rod, which can interact with the drillable stopper in the working position, while the anchor is made in the form of spring-loaded dies, mounted on a hollow cylinder concentrically mounted on a hollow body with the possibility of axial and rotational movement by means of spring centralizers installed a hollow cylinder and a guide pin rigidly connected to the hollow body and placed in a through-shaped groove made in the lower part of the hollow cylinder, the through-shaped groove consisting of a short and long groove, while the upper part of the short groove is connected to the middle part of the long groove, and the packer pressure sleeve from the bottom is provided with a conical surface, tapering from top to bottom and having the ability to interact with the dies of the armature in the working position, in which the guide pin is in a long groove a transportable figured groove, while in the transport position, the guide pin is in a short groove through the figured groove.