RU47956U1 - OPERATION COLUMN INSULATION SYSTEM - Google Patents

Abstract

The utility model relates to the oil and gas industry and can be used to seal emergency casing pipes during development, operation and repair of wells. The basis of this utility model is the solution of the problem, which allows to increase the reliability of locking in the well down, due to the stop of the lower sealing device in a metal plaster, and up, due to small-sized breaking crackers drilled if necessary, and also to improve performance by increasing the through hole in the pipe to ensure the descent of the elevator column. The system for isolating leaks in the production string of pipes consists of lower and upper sealing devices containing cuffs, respectively, lower and upper, which limit the area of leakage during fixation, and an anchor installed in the upper sealing device and placed above the upper cuff. The lower sealing device contains a cone and an abutment with the lower cuff being placed between them, and a metal patch is installed below the leakage area, on the upper edge of which there is a cone, the upper sealing device contains a fixing sleeve

with a thread with the upper cuff placed on it, a movable sleeve with the ability to move along the locking sleeve and mate with the push sleeve, in which a spring split nut is installed, having a thread for connecting to the push sleeve and a thread mated with thread on the fixing sleeve, and the anchor is made with breaking crackers, while the spring split nut is interfaced with the breaking crackers of the anchor, in addition, the cone and emphasis, as well as the locking sleeve and the movable sleeve, are connected to each other by a shear pin s.

Description

The utility model relates to the oil and gas industry and can be used to seal emergency casing pipes during development, operation and repair of wells.

A device is known for sealing a broken column in a well, comprising a liner consisting of an upper and lower part with flat retainers located between them, which are adapted to support the upper end of the lower part of the broken column, RU No. 2222582 C2, E 21 V 29/10, 2004.12 .20.

A device for isolating and separating layers in a well is known, including a housing, a sealing collar, lower and upper cones with slips placed on them, a retainer and an installation mechanism in the form of a cylinder with a piston-pusher, RU No. 2235851 C1, E 21 B 33/13, E 21 B 33/12, 2004.09.10.

A device for oil and gas wells when sealing them, containing a housing, a first and second locking nodes, an elastic element installed between the locking nodes and a cam node located between the elastic ring element and the first locking node, RU No. 2100568 C1, E 21 B 33 / 134, E 21 B 33/129, 1997.12.27.

A known method of sealing the production casing and shutting down the formations, including installing two packers and connecting them together with a pipe, RU No. 2215122 C2, E 21 B 33/122, 2003.10.27.

Known devices provide separation of the layers and, if necessary, contribute to the sealing of damaged areas, but in case of a change in the principle of sealing, for example, installing a patch, removing devices is problematic.

Known packing system for an unpressurized casing string of pipes, consisting of lower and upper sealing devices containing cuffs, respectively, lower and upper, restricting the tightness section during fixation, and an anchor installed in the upper sealing device and placed above the upper cuff, RU No. 33154 U1 , E 21 B 33/12, E 21 B 33/00, 2003.10.10. The lower sealing device contains an anchor.

This technical solution is taken as a prototype of this utility model.

However, it has disadvantages.

The prototype system contains a lower sealing device in the form of a lower packer, the organization of the anchor which significantly reduces the cross-sectional area for lowering the tubing string, this affects the performance of the system, in addition, the system suspended in the well on two mechanical anchors with the possibility of axial extraction is not enough reliable.

The present utility model is based on the solution of a problem that allows to increase the reliability of downhole locking in the well due to

the emphasis of the lower sealing device in the metal patch, and up, due to the small breaking crackers drilled if necessary, as well as to improve performance by increasing the bore in the pipe to ensure the descent of the elevator column.

According to a utility model, this problem is solved due to the fact that the insulation system of a leak in the production string of pipes consists of lower and upper sealing devices containing cuffs, respectively, lower and upper, which limit the area of leakage during fixation, and an anchor installed in the upper sealing device and placed above the upper cuff.

The lower sealing device contains a cone and an abutment with the lower cuff being placed between them, and a metal patch is installed below the leakage area, on the upper edge of which there is a cone, the upper sealing device contains a locking sleeve with thread with the upper cuff placed on it, a movable sleeve with the ability to move along the fixing sleeve and the interface with the pressure sleeve, in which a spring split nut is installed, having a thread for connection to the pressure sleeve and a thread mated to the thread oh on the locking sleeve, and the anchor is configured to crush breadcrumbs, wherein the split nut spring is associated with the armature breaks breadcrumbs, moreover, the cone and the abutment, and the locking sleeve and the sliding sleeve are each connected with each other via shear pins.

The applicant has not identified sources containing information about the technical solution that is identical to the characteristics given in the formula of this utility model, this determines, according to the applicant, the utility model meets the criterion of “novelty”.

The essence of the utility model is illustrated by drawings, which depict:

figure 1 - System insulation leaks production casing, section;

figure 2 - Node And figure 1.

The casing leakage isolation system contains:

Metal patch 1.

Tubing string (tubing) 2.

Lower sealing device 3.

Top sealing device 4.

The lower sealing device 3 includes:

Stop 5.

Cone 6.

Shear pins (connect stop 5 and cone 6) 7.

Lower cuff (between stop 5 and cone 6) 8.

The upper sealing device 4 includes:

Locking sleeve with thread 9,

- upper cuff (on sleeve 9) 10.

Moving sleeve 11.

Shear pins (connect bushings 9 and 11) 12.

An anchor with breaking crackers 13,

- wedge (anchors 13) 14. The pressure sleeve 15,

- spring split nut (in the sleeve 15) 16,

- thread (nuts 16 for sleeve 15) 17,

- thread (nuts 16 for sleeve 9) 18.

The insulation system for leaks in the production string of pipes consists of lower 3 and upper 4 sealing devices that limit the area of leakage during fixation.

The lower sealing device 3 includes a stop 5 and a cone 6. Between the stop 5 and the cone 6, a lower cuff is placed 8. The stop 5 and the cone 6 are connected by shear pins 7.

The metal patch 1 is installed below the leakage area, on the upper edge of which the cone 6 of the lower sealing device 3 abuts.

The upper sealing device 4 includes a locking sleeve with a thread 9, a movable sleeve 11, an anchor with breaking crackers 13 and a wedge 14, a pressing sleeve 15. On the fixing sleeve with a thread 9, an upper cuff 10 is placed. An anchor with breaking crackers 13 is placed above the upper cuff 10. The locking sleeve 9 and the movable sleeve 11 are connected by shear pins 12. The movable sleeve 11 has the ability to move along the locking sleeve 9 and mate with the pressure sleeve 15. In the pressure sleeve 15 is installed spring split nut 16. Spring time A nut 16 is associated with breaking crackers of the armature 13. The spring split nut 16 has two threads 17 and 18. Thread 17 connects the spring split nut 16 to the pressure sleeve 15, and thread 18 allows the spring split nut 16 to interact with the counter thread in the fixing sleeve 9 .

The casing leakage isolation system is installed in the well on the tubing string 2.

The system is installed as follows.

A metal patch 1 is installed below the leak of the production string. On the tubing 2, the system is lowered into the well until the cone 6 abuts against the upper edge of the delivered metal patch 1. When the weight of the tubing pipes is 3-5 ts, the pins 7 are cut and the stop 5 continues to move down along the axis of the cone 6, and compresses the lower cuff 8, making the sealing below the leakage zone.

In the process of continuing the descent of the tubing 2, when the weight load increases to 8-10 tf, the pins 12 are cut off and the movable sleeve 11, moving along the sleeve 9, moves the push sleeve 15 with the spring split nut 16 to the anchor crackers 13. The anchor crackers 13 transfer the load on the wedge 14 and through it to the cuff 10, which seals the space above the leakage of the production string. When the load on the crackers of the anchor 13 is higher than the strength characteristic, the latter break and fix the compressed cuff 10 relative to the production string. When the cuff 10 is compressed, the pressure sleeve 15 with the spring loaded nut 16 will move along the sleeve 9 to the area in which the sleeve 9 has a mating thread 18, a threaded thread (not shown), the anchor 13 will be fixed from the axial displacement of the crackers. The system is installed. The tubing string 2, on which the system descended, together with the movable sleeve 11 is lifted from the well, and the leaky section is isolated from the rest of the well space.

The removal of the system is carried out by milling the upper part of the system to the wedge 14, with subsequent capture of the remaining part by a tap and lifting.

The proposed system was manufactured industrially at the Izmeron plant, and tests performed at the Rybkinsky field of Orenburgneft OJSC confirm its “industrial applicability”.

Claims (1)

The system of isolation of leaks in the production string of pipes, consisting of lower and upper sealing devices containing cuffs, respectively, lower and upper, which limit the area of leakage during fixation, and an anchor installed in the upper sealing device and placed above the upper cuff, characterized in that the lower sealing the device contains a cone and an emphasis with the placement of the lower cuff between them, and a metal patch is installed below the leakage area, on the upper edge of which is located mustache, the upper sealing device includes a locking sleeve with a thread with the upper cuff placed on it, a movable sleeve with the ability to move along the locking sleeve and mating with the push sleeve, in which a spring split nut is installed, having a thread for connecting to the push sleeve and a thread mated with thread on the fixing sleeve, and the anchor is made with breaking crackers, while the spring split nut is paired with the breaking crackers of the anchor, in addition, the cone and emphasis, as well as the fixing sleeve and the movable sleeve are connected to each other by shear pins.