RU70304U1 - DEVICE FOR INSTALLATION AND SEALING OF A COTTING HOLE IN A WELL - Google Patents

Abstract

The utility model relates to the oil industry, in particular to the field of fastening wells, in particular to devices for lowering and sealing the annular space of the casing strings below the latter using the casing shank. A device for installing and sealing a casing liner in a well comprises a sub mounted on the pipe string, on which the inner pipe is suspended and, by means of the coupling, a packer and an anchor connected by means of a coupling to a liner made in the form of a pipe, the inner pipe is made with radial holes in its wall and mounted on its lower end by a valve, the packer is located above the anchor on the upper barrel and is made with elastic cuffs compressible in the axial direction by means of a hydraulic actuator, and the anchor is located on the lower barrel, fixed in the initial position by means of a shear pin and is made with slips mounted with the possibility of moving in the radial direction by means of a hydraulic actuator, while the inner tube forms an annular cavity, hydraulically connected through its radial holes with hydraulic packer and anchor, while the inner pipe is equipped with a rigid centralizer of its position in the upper and lower trunks, the valve is made in the form of installed On the shear pin of the seat and the ball being dropped onto it, a seat and ball trap is installed under the seat, the anchor slips are made rectangular with a T-shank, the armature hydraulic actuator is equipped with a spring compressed in the initial position, compressing the slips to the casing string in the working position, and the armature hydraulic actuator made with a limiter of the axial stroke of the slips, the elastic packer cuffs are made of cylindrical rubber, while steel washers are installed between the cuffs, and the packer is made with an axial compression limiter of elastic mans a. The result is increased reliability and simplified operation of the device.

Description

The utility model relates to the oil industry, in particular to the field of fastening wells, in particular to devices for lowering and sealing the annular space of the casing strings below the latter using the casing shank.

A device for installing and sealing a liner of a casing string in a well is known, including a housing, a shipping string and a disconnector associated with it, a packer and an anchor placed in the upper part of the liner under the disconnector (see Device for lowering, suspending and sealing the liner. Promotional brochure, NGO " Drilling equipment "- VNIIBT", OJSC "Tyazhpressmash", 1986.).

The disadvantage of this device is that with its use there is a need to perform numerous technological operations associated with sealing the annular space of the shank and disconnecting this shank from the transport column.

To drive the device into action, it is necessary to use a composite (sectional) plug. Only this can already cause a leak in the device (when landing one section of the cork on another) and, as a result, even greater complications of the aforementioned technological operations (due to the difficulty of providing the necessary pressures for actuating the actuating units of the device).

The closest to the utility model in terms of technical nature and the achieved result is a device for installing and sealing a casing liner in a well, comprising a sub mounted on a pipe string, on which an inner pipe is suspended and, by means of a coupling, a packer and an anchor connected by means of a coupling to in the form of a pipe with a shank, the inner pipe is made with radial holes in its wall and a valve installed on its lower end, the packer is located above the anchor on the upper stem le and configured compressible in the axial direction by the hydraulic drive of elastic cuffs, and the anchor is located on the lower barrel is fixed in the initial position by a shear pin and adapted mounted movably in the radial direction by means of hydraulic drive slips, the inner

the pipe forms an annular cavity with interconnected upper and lower trunks, hydraulically connected through its radial openings to the packer and anchor hydraulic drives (see patent RU No. 2171366, class E21B 43/10, July 27, 2001).

However, this device has a relatively complex design of a butterfly valve and elastic packer cuffs. In addition, there are no means for centering the position of the pipe on which the throttle shutoff valve is installed. As a result, this device has a relatively low reliability.

The task to which the utility model is directed is to simplify the design of the device for installing and sealing the casing liner in the well.

The technical result consists in increasing the reliability and simplifying the operation of the device.

This problem is solved, and the technical result is achieved due to the fact that the device for installing and sealing the liner of the casing string in the well contains an adapter mounted on the pipe string, on which the inner pipe is suspended and, by means of the coupling, a packer and an anchor connected by means of a coupling to the form pipe shank, the inner pipe is made with radial holes in its wall and a valve installed on its lower end, the packer is located above the anchor on the upper barrel and is made with compression elastic cuffs axially removable by means of a hydraulic actuator, and the anchor is located on the lower barrel, fixed in the initial position by means of a shear pin and made with slips mounted with the possibility of moving in the radial direction by hydraulic actuator, while the inner pipe forms with the upper and lower trunks connected to each other an annular cavity hydraulically connected through its radial holes with hydraulic packer and anchor, while the inner tube is equipped with a rigid center A thrust of its position in the upper and lower trunks, the valve is made in the form of a seat mounted on a shear pin and a ball discharged onto it, a seat and ball trap are installed under the seat, anchor slips are made rectangular with a T-shaped shank, the armature hydraulic actuator is equipped with a spring compressed in the initial position pressing the slips to the casing in the working position, and the hydraulic armature is made with an axial stroke limiter for the slips, the elastic packer cuffs are made of cylindrical rubber, and between the cuffs steel washers, and the packer is made with a limiter of axial compression of elastic cuffs.

The studies and tests showed that it is possible to increase the reliability of the device for installing and sealing the casing liner in the well, by simplifying the design of a number of structural elements of the device. In particular, due to the execution of the anchor with rigid rectangular elongated along the device axis slips with a T-shaped shank, it is possible to more rigidly fix the anchor, the installation of the spring allows you to constantly tighten the slips in the axial direction in the working position of the device after depressurizing the packer, which prevents failure of the device after its installation in the casing string. The implementation of the device with the axial stroke limiter of the slips and the axial compression of the packer cuffs can be prevented from being damaged during installation of the device in the casing, the packer with cylindrical rubber elements and steel washers - disconnectors between them can simplify the design of the packer, and the inner pipe with a centralizer and a valve on the inner pipe in the form of a saddle mounted on a shear pin for a ball being dropped and with a trap installed under the saddle allowed even greater e simplify the design of the device and increase its reliability. As a result, the device does not require special routine maintenance in preparation for the descent.

Figure 1 shows a longitudinal section of a device for installing and sealing a liner casing in the well.

Figure 2 shows a fragment of the device at the installation site of the anchor slips on the lower barrel (inner pipe not shown).

A device for installing and sealing a casing liner in a well comprises a sub 2 mounted on a pipe string 1, on which an inner pipe 3 is suspended and, by means of a coupling 4, a packer 5 and an anchor 6 connected by a connecting sleeve 7 to a liner 8 made in the form of a pipe. The inner pipe 3 is made with radial holes 9 in its wall and a valve 10 installed on its lower end. Packer 5 is located above the armature 6 on the upper barrel 11 and is made with elastically compressible axially by means of hydraulic actuator 12 cuffs 13. Anchor 6 is located on the lower barrel 14, is fixed in its initial position by means of a shear pin 15 and is made with slots 17 mounted with the possibility of moving in the radial direction by hydraulic actuator 17. The inner tube 3 forms with the upper 11 and lower 14 trunks connected to each other an annular cavity 18 hydraulically connected through its radial holes 9 with hydraulic actuators 12 and 16 of the packer 5 and the armature 6. Internal

the pipe 3 is equipped with a rigid centralizer 19 of its position in the upper and lower trunks 11 and 14. The valve 10 is made in the form of a saddle 21 mounted on a shear pin 20 and a ball 22 discharged onto it, and a trap 23 of the saddle 21 and ball 22 is installed under the saddle 21. 17 anchors 6 are made rectangular with a T-shank 24. The hydraulic actuator 16 of the anchor 6 is equipped with a spring 25 compressed in its initial position, pressing the slips 17 to the casing (not shown in the drawing) in the operating position, and the hydraulic actuator 16 of the anchor 6 is made with an axial limiter 26 Slip Stroke 17. Elasti nye cuffs 13 are cylindrical packer 5 of rubber, and the cuffs 13 are mounted between the steel washer 27 and the packer 5 with the stopper 28 formed of axial compression elastic cuffs 13.

A device for installing and sealing a casing liner in a well descends to a predetermined interval of the well.

During the descent, the fluid located in the well flows freely into the internal cavity of the device through the through hole in the seat 21 of the valve 10.

Then, a ball 22 is thrown into the pipe string, which falls onto the seat 21 of the valve 10 and closes the passage of the seat 21. The pipe string is pressurized with fluid, which through the holes 9 in the inner pipe 3 enters the annular cavity 18. From the latter, the pressure fluid enters into the hydraulic actuator 16 of the anchor 6. Under the action of the hydraulic actuator 16, the pin 15 is cut off through the axial limiter 26, releasing the clip with slips 17, which, when moving upward, the clips move in the radial direction and are embedded in the casing wall. When the pin 15 is cut off, the spring 25 expands and creates a piston 29 located in the hydraulic actuator 16, an axial stroke limiter 26 and a clip with slips 17 additional force to insert the slips 17 into the casing and hold the slips 17 in their working position after depressurizing. At the same time, the fluid through the holes in the upper barrel 11 creates pressure on the hydraulic actuator 12, which moves toward the cuffs 13 compresses the cuffs 13. Mounted in the hydraulic actuator 12, the thrust ring 30 moving along the upper barrel 11 fixes the compression position of the cuffs 13.

When the specified pressure is reached, the pin 20 is cut off on the seat 21 of the valve 10 and it, together with the ball 22, falls into the trap 23.

Then, turning the pipe string 1 to the right, the adapter 2 is turned away which, together with the inner pipe 3, centralizer 19 and valve 10 with the trap 23, as well as the ball 22 and the valve seat 21 located in it, rises up.

This utility model can be used in the oil and gas industry and other industries where sealing of the casing annulus below the latter is required.

Claims (1)

A device for installing and sealing a casing liner in a well, comprising a sub mounted on the pipe string, on which the inner pipe is suspended and, by means of the coupling, a packer and an anchor connected by means of a coupling to a liner made in the form of a pipe, the inner pipe is made with radial holes in its wall and a valve installed on its lower end, the packer is located above the anchor on the upper barrel and is made with axially compressible elastic cuffs hydraulically driven and the anchor is located on the lower barrel, fixed in the initial position by means of a shear pin and made with slides mounted with the possibility of moving in the radial direction by means of a hydraulic actuator, while the inner pipe forms an annular cavity hydraulically connected through its radial holes with hydraulic packer and anchor, characterized in that the inner pipe is equipped with a rigid centralizer of its position in the upper and lower trunks, the valve is made in de installed on the shear pin of the seat and the ball being dropped onto it, a seat and ball trap is installed under the seat, the anchor slips are made rectangular with a T-shank, the armature hydraulic actuator is equipped with a spring compressed in the initial position, compressing the slips to the casing string in the working position, and the hydraulic actuator the anchors are made with a limiter of the axial stroke of the slips, the elastic packer cuffs are made of cylindrical rubber, while steel washers are installed between the cuffs, and the packer is made with an axial compression limiter elastic cuffs.