CN116066014A

CN116066014A - Self-adaptive annular packing tool

Info

Publication number: CN116066014A
Application number: CN202111290009.7A
Authority: CN
Inventors: 魏新芳; 杨海波; 张建国; 张磊; 陈阳; 王毅; 解蒙; 马明新; 曹成章; 宋翰林; 姜兆阳; 胡楠
Original assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Current assignee: China Petrochemical Corp; Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2023-05-05

Abstract

The invention relates to a self-adaptive annular packing tool, wherein a central tube is of a cylindrical structure, four liquid inlets are uniformly distributed near the left end along the circumferential direction, and triangular threads are arranged on the outer side of the middle. The sleeve is of a circular ring structure, and 6 pin holes are uniformly distributed at the right end along the axial direction. The left baffle ring is of a cylindrical structure, the outer side of the middle part is provided with a pin groove, the inner side of the middle part is provided with a triangular screw thread, and the inner part of the right end is provided with a conical surface with an angle of 45 degrees. The rubber cylinder is of a circular ring structure, the outer diameter of the middle part is larger than that of the two sides, and the left end and the right end of the rubber cylinder are provided with conical surfaces with 45-degree angles. The single right baffle ring is of a fan-shaped structure, 10 right baffle rings uniformly distributed along the axis form a circular ring, the right end of the right baffle ring is of a circular tube structure, and a spring is arranged in the circular tube structure. The spring is positioned in the circular tube at the right end of the right baffle ring, and is in a compressed state during installation. 10 holes are uniformly distributed at the left end of the end ring along the circumferential direction. The adaptive annulus packing tool may accomplish permanent packing of irregular annular shapes.

Description

Self-adaptive annular packing tool

Technical Field

The invention relates to the field of petroleum well completion, in particular to a self-adaptive annular packing tool.

Background

Annular packer operation is one of the common procedures in petroleum completions. The device has the main function of realizing the isolation between hydrocarbon reservoirs with different pressures (or temperatures) or hydrocarbon reservoirs and non-producing layers (such as water layers), so as to achieve the purpose of preventing the mutual interference of fluids with different properties or pressure systems between different layers, thereby realizing the purpose of respectively mining the producing layers.

To achieve the purpose of annulus packing, there are two main implementations: firstly, circulating cement slurry to an annulus by adopting a well cementation mode, and realizing the packing of an interval after the cement is solidified; secondly, the annular packing tool is lowered into an interval needing to be packed by adopting a conventional packing tool mode, and packing of the interval is achieved by adopting an extrusion or expansion rubber cylinder. In the face of increasingly difficult exploration and development situations, how to complete the packing of irregular well sections becomes a development difficulty. Both of these approaches are inadequate for isolation in irregular wellbore annulus. Because the cement slurry is in the lower portion of the wellbore during the flow process, the seal against the upper portion of the wellbore is incomplete. This is particularly the case in inclined and horizontal wells. Conventional packer tools are round in cross-section after setting, often resulting in seal failure for irregular wellbore contact stresses.

Thus, to improve the annulus packing technology, there is a need to develop tools or techniques that automatically adapt to the shape of the borehole.

Disclosure of Invention

In order to achieve continuous sealing of an annular packing tool in an irregular wellbore interval, the invention provides a self-adaptive annular packing tool.

The adaptive annulus packer tool comprises: the device comprises a left joint, a central tube, a pin, a sleeve, a left baffle ring, a rubber cylinder, a right baffle ring, a spring, an end ring and a right joint. The left joint is of a circular structure, threads are arranged on the inner side of the left end, and threads are arranged on the inner side and the outer side of the right end. The central tube is of a cylindrical structure, threads are arranged at the outer parts of the left end and the right end and are respectively connected with a left joint and a right joint, four liquid inlet holes are uniformly distributed on the left side close to the end part along the circumferential direction, and triangular threads are arranged at the outer side of the middle part. The sleeve is of a circular structure, threads are arranged on the inner side of the left end and are connected with the left joint, 6 pin holes are uniformly distributed on the right end along the axis direction, and the sleeve is connected with the left baffle ring through pins. The left baffle ring is of a cylindrical structure, two sealing grooves are formed in the inner side and the outer side of the left end, a pin groove is formed in the outer side of the middle, triangular threads are formed in the inner side of the middle and opposite to the threads on the outer side of the central tube, a conical surface with an angle of 45 degrees is formed in the right end, and the right end is of a thin cylindrical shape and used for protecting a rubber cylinder. The rubber cylinder is of a circular structure, the outer diameter of the middle part is larger than the outer diameters of the two sides, and the left end and the right end are provided with conical surfaces with 45 degrees and are matched with the left baffle ring and the right baffle ring. The single right baffle ring is of a fan-shaped structure, 10 right baffle rings uniformly distributed along the axis form a circular ring, the left end of the right baffle ring is cylindrical and used for protecting a rubber cylinder, the inner side of the left end is provided with a conical surface, the right end is of a circular tube structure, the right end is inserted into a hole at the left end of the end ring, and a spring is arranged in the circular tube structure. The spring is positioned in the right end circular tube of the right baffle ring, is in a compressed state during installation, and the left end is contacted with the right baffle ring and the right end is contacted with the end ring. 10 holes are uniformly distributed at the left end of the end ring along the circumferential direction, a right end circular tube and a spring of a right baffle ring are arranged in each hole, and a screw thread is arranged in the right end and is connected with a right joint. The inside and outside of the left end of the right joint are respectively provided with screw threads, the screw threads are respectively connected with the end ring and the central tube, the inside of the left end is provided with two sealing grooves, and the outside of the right end is provided with screw threads.

The adaptive annular packing tool is used for sealing irregular annular under the combined action of surface pressure and a spring. The adaptive annulus packing tool is installed at a specific location in the completion string according to the well design. After the hydraulic oil well is put into a designed position in the oil well, the internal pressure of the tool is increased, and the liquid in the well passes through a liquid inlet hole on the left side of the central tube to push the left baffle ring. When the pressure is increased to the starting pressure of the tool, the pin is sheared, the left baffle ring extrudes the rubber cylinder, the rubber cylinder gradually bulges until the outer surface is contacted with the well wall, and the primary setting process is completed. After the rubber cylinder is sealed, the direction of the triangular screw threads on the inner side of the left baffle ring is opposite to the direction of the triangular screw threads on the outer side of the central tube, so that reliable locking is formed. The spring is pressed by the right baffle ring and the end ring to be in a compressed state. When the shaft is irregularly shaped, the contact stress of the rubber cylinder and the well wall is different, 10 springs uniformly distributed along the circumferential direction are respectively stretched for a certain distance according to the contact stress of the rubber cylinder to release pressure, and each right end ring is pushed to move leftwards for a certain distance, so that secondary extrusion deformation of the rubber cylinder in different circumferential degrees is formed. The self-adaptive annular packing tool realizes automatic adjustment of contact stress between the rubber cylinder and the well wall through different thrust of each spring to the right end ring.

Compared with the prior art, the self-adaptive annular packing tool has the advantages that: (1) The tool setting process is divided into two stages, wherein the first stage is realized by pushing a rubber cylinder by a left baffle ring, the second stage is realized by pushing a right baffle ring by a spring, and the two stages ensure the durable setting of the annular packing tool; (2) 10 springs uniformly distributed along the circumferential direction can automatically release pressure to extrude the rubber cylinder again according to the contact stress condition of the corresponding part of the rubber cylinder and the well wall, so that the rubber cylinder is in self-adaptive contact with the well wall in the circumferential direction; (3) A pin is arranged between the sleeve and the left baffle ring, so that the tool can be prevented from being set forward in the process of being put down; (4) The inner side of the left baffle ring and the outer side of the central tube are provided with triangular screw threads, and when the tool is set, the two screw threads can be interlocked to prevent the sealing failure.

Drawings

The invention will be described hereinafter from the point of view of embodiments and with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of an adaptive annulus packer tool and method of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

The adaptive annulus packing tool comprises: the left joint 1, the central tube 2, the pin 3, the sleeve 4, the left baffle ring 5, the rubber cylinder 6, the right baffle ring 7, the spring 8, the end ring 9 and the right joint 10.

The adaptive annulus packing tool is installed at a specific location in the completion string according to the well design. After the hydraulic oil well is put into a designed position in the oil well, the internal pressure of the tool is increased, and the liquid in the well passes through a liquid inlet hole on the left side of the central tube 2 to push the left baffle ring 5. When the pressure is increased to the starting pressure of the tool, the pin 3 is shortened, the left baffle ring 5 extrudes the rubber cylinder 6, the rubber cylinder 6 gradually bulges until the outer surface is contacted with the well wall, and the primary setting process is completed. After the rubber cylinder 6 is sealed, the direction of the triangular screw threads on the inner side of the left baffle ring 5 is opposite to that of the triangular screw threads on the outer side of the central tube 2, so that reliable locking is formed. The spring 8 is pressed in compression by the right stop ring 7 and the end ring 9. When the shaft is irregularly shaped, the contact stress of the rubber cylinder 6 and the well wall is different in the circumferential direction, 10 springs 8 uniformly distributed along the circumferential direction are respectively extended for a certain distance according to the contact stress of the rubber cylinder 6 to release pressure, and each right end ring 7 is pushed to move leftwards for a certain distance, so that secondary extrusion deformation of the rubber cylinder 6 in different degrees in the circumferential direction is formed. The self-adaptive annular packing tool realizes automatic adjustment of contact stress between the rubber cylinder 6 and the well wall through different thrusts of each spring 8 to the right baffle ring 7.

The self-adaptive annular space packing tool can realize primary setting and secondary setting, the annular space packing effect is durable and reliable, and the circumferential distribution springs 8 can self-adaptively adjust the expansion and contraction amount according to the size of the local stress of the setting, so that the self-adaptive packing effect of the annular space is ensured.

Claims

1. The utility model provides a self-adaptation annular space seals instrument which characterized in that, including left joint, center tube, the right joint that connects gradually, the outside cover of center tube is equipped with the packing element.

2. The self-adaptive annular packing tool according to claim 1, wherein the outside of the central tube is sequentially sleeved with a sleeve, a left baffle ring, a rubber cylinder, a right baffle ring and an end ring from left to right.

3. The adaptive annular packing tool of claim 2, wherein the left side of the sleeve and the right side of the end ring are limited by steps provided at the left and right joints.

4. The adaptive annular packing tool of claim 3, wherein a spring is disposed between the right stop ring and the end ring;

the left end face of the end ring is provided with a plurality of round tubes, springs are arranged in the round tubes, and the right baffle ring compresses the springs in the round tubes.

5. The self-adaptive annular packing tool according to claim 4, wherein the central tube is of a cylindrical structure, four liquid inlet holes are uniformly distributed on the left side near the end part along the circumferential direction, and triangular threads are arranged on the outer side of the middle part.

6. The adaptive annular packing tool of claim 5, wherein the sleeve is of a circular configuration with 6 pin holes evenly distributed along the axis at the right end.

7. The adaptive annular packing tool of claim 6, wherein the left baffle ring has a cylindrical structure, two seal grooves are formed on the inner side and the outer side of the left end, a pin groove is formed on the outer side of the middle, a triangular screw thread is formed on the inner side of the middle and opposite to the screw thread on the outer side of the central tube, and a conical surface with an angle of 45 ° is formed inside the right end.

8. The self-adaptive annular packing tool according to claim 7, wherein the rubber cylinder is of a circular ring structure, the outer diameter of the middle part is larger than that of the two sides, and conical surfaces with an angle of 45 degrees are arranged at the left end and the right end and are matched with the left baffle ring and the right baffle ring.

9. The self-adaptive annular packing tool according to claim 8, wherein the single right baffle ring is of a fan-shaped structure, 10 right baffle rings uniformly distributed along the axis form a circular ring, the inner side of the left end is provided with a conical surface, the right end is of a circular tube-shaped structure, the circular tube-shaped structure is inserted into a hole at the left end of the end ring, and a spring is arranged in the circular tube-shaped structure.

10. The adaptive annular packing tool of claim 9, wherein the spring is disposed within the right end barrel of the right stop ring, when installed in a compressed state, the left end is in contact with the right stop ring, and the right end is in contact with the end ring.

11. The adaptive annular packing tool of claim 10, wherein 10 holes are uniformly distributed in the circumferential direction at the left end of the end ring, and a right end circular tube and a spring of the right baffle ring are installed in each hole.