Permanent packer for gas recovery of gas well

Abstract

The invention relates to the technical field of gas well gas production, and discloses a permanent packer for gas well gas production, which comprises an upper joint, a pressure-bearing joint and a first rubber sleeve, the first rubber sleeve is arranged at the bottom end of the upper joint, a first spacer ring is arranged at the bottom end of the first rubber sleeve, a second rubber sleeve is arranged at the bottom end of the first spacer ring, and a second spacer ring is arranged at the bottom end of the second rubber sleeve. A first rubber sleeve is arranged at the bottom end of the first spacer ring, a second rubber sleeve is arranged at the bottom end of the second spacer ring, a pressure-bearing connector is arranged at the bottom end of the third rubber sleeve, a pressing rod is arranged in the pressure-bearing plate, and a pressing head is arranged at the top end of the pressing rod. Through the interference fit connection of the pressing rod and the bearing plate, the pressing rod can be prevented from rising back, the first rubber barrel, the second rubber barrel and the third rubber barrel can be always kept to expand under pressure, and the permanent sealing effect of the packer is ensured through simultaneous expansion sealing of the three rubber barrels.

Description

Technical Field

[0001] The invention relates to the technical field of gas well production, in particular to a permanent packer for gas well production. Background Art

[0002] The permanent packer used for gas well production is a device used in oil and gas field completion operations, mainly used to form a long-term sealing barrier underground. When the gas well is drilled and ready to start production, the permanent packer will be installed at a specified location in the wellbore and activated in a specific way, usually hydraulically or mechanically, to expand and come into close contact with the well wall, thereby achieving a sealing effect. The permanent packer is designed to isolate different geological layers and prevent fluids from interfering with each other between different layers. It can also help control the direction of fluid flow underground to ensure that the gas well can be produced safely and effectively.

[0003] For example, the existing Chinese patent (CN212716532U) discloses a permanent packer for gas well production, including a central tube, a first slip ring is sleeved on the outside of the central tube, the first slip ring is slidably connected to the central tube, a sealing mechanism is provided at the bottom of the first slip ring, a fixing mechanism is provided at the top of the first slip ring, the sealing mechanism includes a rubber tube, the rubber tube is sleeved on the outside of the central tube, the rubber tube is slidably connected to the central tube, a second slip ring is provided at the bottom of the rubber tube, the second slip ring is sleeved on the outside of the central tube, and the second slip ring is slidably connected to the central tube. The utility model fixes the second slider and further fixes the second slip ring by the fixed teeth at one end of the second slider contacting with the well wall, while the first slip ring continues to compress the rubber tube downward, the bottom of the rubber tube is limited by the second slip ring, so that the rubber tube expands, and then closes the gap between the central tube and the well wall, thereby achieving sealing, and the stability of the sealing is improved by combining the fixed teeth with the rubber tube.

[0004] In the above technical solution, the rubber cylinder is further compressed downward by the first sliding ring, and the bottom of the rubber cylinder is limited by the second sliding ring, so that the rubber cylinder expands, and then the gap between the center tube and the well wall is closed, thereby achieving sealing. However, there is only one rubber cylinder expansion seal, and in actual application, it is easy to have a poor sealing effect. Summary of the invention

[0005] The object of the present invention is to provide a permanent packer for gas well production to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a permanent seal for gas well production, comprising an upper joint, a pressure-bearing joint and a first rubber tube, the bottom end of the upper joint is provided with a first rubber tube, the bottom end of the first rubber tube is provided with a first spacer ring, the bottom end of the first spacer ring is provided with a second rubber tube, the bottom end of the second rubber tube is provided with a second spacer ring, the bottom end of the second spacer ring is provided with a third rubber tube, the bottom end of the third rubber tube is provided with a pressure-bearing joint, a pressure plate is fixed to the inner wall of the middle part of the pressure-bearing joint, a pressure rod is provided inside the pressure plate, a pressure head is provided at the top of the pressure rod, a connecting rod is provided on the outer wall of the pressure rod, there are multiple connecting rods, one end of several of the connecting rods is respectively fixedly connected to the upper joint, the first spacer ring and the second spacer ring, a through hole is opened in the center of the pressure plate, and the pressure plate and the pressure rod are interference fit.

[0007] As a further explanation of the present invention, a conical pressure block with a large top diameter and a small bottom diameter is fixed to the outer wall of the pressure rod, and there are three conical pressure blocks, which are respectively located in the central areas of the first rubber cylinder, the second rubber cylinder and the third rubber cylinder, and elastic binding rings are arranged on the inner walls of the first rubber cylinder, the second rubber cylinder and the third rubber cylinder, and an expansion block is arranged on the inner side of the elastic binding ring. There are multiple expansion blocks, and the multiple expansion blocks can form a cylinder, and a conical hole matching the conical pressure block is opened in the center of the cylinder formed by the expansion blocks.

[0008] As a further explanation of the present invention, a conical step head is provided at the bottom end of the pressure rod, a swing rod is rotatably provided on the inner wall of the pressure joint, a pressure rod is provided at one end of the swing rod, and one side of the pressure rod is in contact with the step surface of the conical step head.

[0009] As a further explanation of the present invention, a torsion spring shaft is provided at one end of the swing arm, and fixing seats are provided at both ends of the torsion spring shaft, and one side of the fixing seat is fixedly connected to the inner wall of the pressure-bearing joint.

[0010] As a further explanation of the present invention, connection points are provided on both sides of the inner and outer sides of the elastic binding ring. There are several connection points. The several connection points located on the inner side are connected and fixed to the expansion block by glue, and the several connection points located on the outer side are respectively connected to the first rubber tube, the second rubber tube and the third rubber tube by glue.

[0011] As a further illustration of the present invention, the first rubber tube, the second rubber tube and the third rubber tube have the same structure, and the outer diameters of the first rubber tube, the second rubber tube and the third rubber tube are the same as the outer diameter of the bottom of the upper joint.

[0012] As a further description of the present invention, there are four torsion spring rotating shafts, and the four torsion spring rotating shafts are evenly arranged circumferentially on the inner wall of the pressure-bearing joint.

[0013] As a further illustration of the present invention, the expansion block is in the shape of a quarter cylinder, and a notch is provided on the inner wall of the expansion block for enclosing the tapered hole.

[0014] As a further illustration of the present invention, the outer wall of the expansion block at the top fits with the inner wall of the first rubber tube, the outer wall of the expansion block at the middle fits with the inner wall of the second rubber tube, and the outer wall of the expansion block at the bottom fits with the inner wall of the third rubber tube.

[0015] As a further explanation of the present invention, the height of the expansion block is smaller than the height of the rubber tube, the first spacer ring has the same structure as the second spacer ring, the outer diameter of the first spacer ring is the same as the outer diameter of the first rubber tube, and the inner diameter of the first spacer ring is the same as the first rubber tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes that when a permanent sealer for gas well production is used, after the sealer is transported to a designated sealing position, the pressure head is pressurized by hydraulic equipment to make the pressure rod descend, and the pressure rod is fixedly connected to the upper joint, the first spacer ring and the second spacer ring through a connecting rod, thereby driving the upper joint, the first spacer ring and the second spacer ring to descend. During the descending process, the first rubber cylinder, the second rubber cylinder and the third rubber cylinder are pressurized respectively by the upper joint, the first spacer ring and the second spacer ring, so that the first rubber cylinder, the second rubber cylinder and the third rubber cylinder are deformed and expanded under pressure, so that the outer walls of the first rubber cylinder, the second rubber cylinder and the third rubber cylinder are sealed with the well wall of the gas well. The pressure rod is prevented from rising back by the interference fit connection with the pressure plate, and the first rubber cylinder, the second rubber cylinder and the third rubber cylinder can be kept under pressure and expanded all the time. The three rubber cylinders are expanded and sealed at the same time to ensure the permanent sealing effect of the sealer.

[0017] During the downward pressing process of the pressure rod, the conical step head will also drop accordingly. Through the step effect of the conical step head and the elastic rotation connection of the torsion spring shaft of the pressure rod, when the pressure rod drops to the designed height, the pressure rod can abut against the steps of the conical step head, further preventing the pressure rod from rising back and ensuring the permanent sealing effect of the packer.

[0018] In addition, when the pressure rod descends, the conical pressure block fixed on the pressure rod also descends. The conical design of the conical pressure block with a large top diameter and a small bottom diameter can allow the expansion block to expand outward to support the expanded rubber cylinder, prevent the rubber cylinder from shrinking, and further improve the permanent sealing effect of the packer.

[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1An exploded view of a permanent packer for gas well production according to the present invention; Figure 2 A three-dimensional diagram of a permanent packer for gas well production according to the present invention; Figure 3 This is a front view of a permanent packer for gas well production according to the present invention; Figure 4 A bottom view of a permanent packer for gas well production according to the present invention; Figure 5 This is a schematic diagram of a rod connection structure of a permanent packer for gas well production according to the present invention; Figure 6 It is a main cross-sectional schematic diagram of a permanent packer for gas well production according to the present invention; Figure 7 for Figure 6 The enlarged structural diagram at A in the middle; Figure 8 It is a left sectional view of a permanent packer for gas well production according to the present invention; Fig. 9 for Figure 8 The enlarged structural diagram at B in the middle; Fig.10 The present invention is a schematic diagram of the expansion block connection structure of a permanent packer for gas well production.

[0021] In the figure: 1. upper joint; 2. pressure-bearing joint; 3. first rubber cylinder; 4. second rubber cylinder; 5. third rubber cylinder; 6. first spacer ring; 7. second spacer ring; 8. pressure rod; 9. pressure head; 10. conical pressure block; 11. connecting rod; 12. pressure plate; 13. conical step head; 14. expansion block; 15. elastic binding ring; 16. fixing seat; 17. torsion spring shaft; 18. rocker arm; 19. pressure rod; 20. connection point; 21. conical hole. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Example 1: Please refer to Figure 1-Figure 3 The present invention provides a technical solution: a permanent packer for gas well production, comprising an upper joint 1, a pressure-bearing joint 2 and a first rubber tube 3. The upper joint 1 is the top component of the entire packer, which is responsible for connecting the packer with a downhole operation tool string or a conveying pipe string, and is an important part for transmitting pressure and mechanical force. The pressure-bearing joint 2 is located at the bottom of the packer, and is used to withstand the pressure from below and provide a stable foundation for installing other components.

[0024] A first rubber cylinder 3 is provided at the bottom end of the upper joint 1, a first spacer ring 6 is provided at the bottom end of the first rubber cylinder 3, a second rubber cylinder 4 is provided at the bottom end of the first spacer ring 6, a second spacer ring 7 is provided at the bottom end of the second rubber cylinder 4, and a third rubber cylinder 5 is provided at the bottom end of the second spacer ring 7. The first rubber cylinder 3, the second rubber cylinder 4 and the third rubber cylinder 5 are all rubber sealing elements contacting the well wall, which will expand when squeezed to form a seal with the well wall.

[0025] A pressure joint 2 is provided at the bottom end of the third rubber cylinder 5, a pressure plate 12 is fixed to the inner wall in the middle of the pressure joint 2, a pressure rod 8 is provided inside the pressure plate 12, a pressure head 9 is provided at the top of the pressure rod 8, a connecting rod 11 is provided on the outer wall of the pressure rod 8, there are multiple connecting rods 11, one end of several connecting rods 11 are respectively fixedly connected to the upper joint 1, the first spacer ring 6, and the second spacer ring 7. When the permanent packer is used for gas well production, after the packer is transported to the designated isolation position, the pressure head 9 is pressurized by hydraulic equipment to make the pressure rod 8 descend, and the pressure rod 8 is fixedly connected to the upper joint 1, the first spacer ring 6 and the second spacer ring 7 through the connecting rod 11, thereby driving the upper joint 1, the first spacer ring 6 and the second spacer ring 7 to descend.

[0026] A through hole is provided in the center of the pressure plate 12, and there is an interference fit between the pressure plate 12 and the pressure rod 8. During the descent process, the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are respectively pressurized by the upper joint 1, the first spacer ring 6 and the second spacer ring 7, so that the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are deformed and expanded under pressure, so that the outer walls of the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are sealed with the well wall of the gas well. The pressure rod 8 is connected with the pressure plate 12 through an interference fit, so that the pressure rod 8 can be prevented from rising back, and the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 can be kept under pressure and expanded. The three rubber tubes are expanded and sealed at the same time to ensure the permanent sealing effect of the packer.

[0027] Example 2: Please refer to Figure 1-Figure 7 The present invention provides a technical solution: a permanent packer for gas well production, comprising an upper joint 1, a pressure-bearing joint 2 and a first rubber tube 3. The upper joint 1 is the top component of the entire packer, which is responsible for connecting the packer with a downhole operation tool string or a conveying pipe string, and is an important part for transmitting pressure and mechanical force. The pressure-bearing joint 2 is located at the bottom of the packer, and is used to withstand the pressure from below and provide a stable foundation for installing other components.

[0028] A first rubber cylinder 3 is provided at the bottom end of the upper joint 1, a first spacer ring 6 is provided at the bottom end of the first rubber cylinder 3, a second rubber cylinder 4 is provided at the bottom end of the first spacer ring 6, a second spacer ring 7 is provided at the bottom end of the second rubber cylinder 4, and a third rubber cylinder 5 is provided at the bottom end of the second spacer ring 7. The first rubber cylinder 3, the second rubber cylinder 4 and the third rubber cylinder 5 are all rubber sealing elements contacting the well wall, which will expand when squeezed to form a seal with the well wall.

[0029] A pressure joint 2 is provided at the bottom end of the third rubber cylinder 5, a pressure plate 12 is fixed to the inner wall in the middle of the pressure joint 2, a pressure rod 8 is provided inside the pressure plate 12, a pressure head 9 is provided at the top of the pressure rod 8, a connecting rod 11 is provided on the outer wall of the pressure rod 8, there are multiple connecting rods 11, one end of several connecting rods 11 are respectively fixedly connected to the upper joint 1, the first spacer ring 6, and the second spacer ring 7. When the permanent packer is used for gas well production, after the packer is transported to the designated isolation position, the pressure head 9 is pressurized by hydraulic equipment to make the pressure rod 8 descend, and the pressure rod 8 is fixedly connected to the upper joint 1, the first spacer ring 6 and the second spacer ring 7 through the connecting rod 11, thereby driving the upper joint 1, the first spacer ring 6 and the second spacer ring 7 to descend.

[0030] A through hole is provided in the center of the pressure plate 12, and there is an interference fit between the pressure plate 12 and the pressure rod 8. During the descent process, the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are respectively pressurized by the upper joint 1, the first spacer ring 6 and the second spacer ring 7, so that the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are deformed and expanded under pressure, so that the outer walls of the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are sealed with the well wall of the gas well. The pressure rod 8 is connected with the pressure plate 12 through an interference fit, which can prevent the pressure rod 8 from rising back, and can keep the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 under pressure and expansion. The three rubber tubes are expanded and sealed at the same time to ensure the permanent sealing effect of the packer; In this embodiment, a conical step head 13 is provided at the bottom end of the pressure rod 8, a swing rod 18 is rotatably provided on the inner wall of the pressure joint 2, a pressure rod 19 is provided at one end of the swing rod 18, and one side of the pressure rod 19 abuts against the step surface of the conical step head 13. A torsion spring shaft 17 is provided at one end of the swing rod 18, and fixed seats 16 are provided at both ends of the torsion spring shaft 17, and one side of the fixed seat 16 is fixedly connected to the inner wall of the pressure joint 2. During the downward pressing process of the pressure rod 8, the conical step head 13 will also drop accordingly. Through the step effect of the conical step head 13 and the elastic rotation connection of the torsion spring shaft 17 of the pressure rod 19, when the pressure rod 8 drops to the designed height, the pressure rod 19 can abut against the step of the conical step head 13, further preventing the pressure rod 8 from rising back, thereby ensuring the permanent sealing effect of the packer; in this way, even if the external hydraulic pressure is removed, the pressure rod 8 will not rise due to its own weight or other factors, thereby ensuring the permanent sealing effect of the packer.

[0031] There are four torsion spring shafts 17, and the four torsion spring shafts 17 are evenly arranged circumferentially on the inner wall of the pressure-bearing joint 2. The four torsion spring shafts 17 mean that there are multiple points to provide reverse support force to prevent the pressure rod 8 from rebounding upward when the external pressure is lost. This design improves the redundancy of the system. Even if a torsion spring fails, the other torsion springs can continue to play a role. The evenly distributed design helps to balance the mechanical properties of the entire device, making the movement of the pressure rod 8 more consistent during the downward process, reducing the problems that may be caused by uneven force on one side.

[0032] Example 3: Please refer to Figure 1-Figure 10 The present invention provides a technical solution: a permanent packer for gas well production, comprising an upper joint 1, a pressure-bearing joint 2 and a first rubber tube 3. The upper joint 1 is the top component of the entire packer, which is responsible for connecting the packer with a downhole operation tool string or a conveying pipe string, and is an important part for transmitting pressure and mechanical force. The pressure-bearing joint 2 is located at the bottom of the packer, and is used to withstand the pressure from below and provide a stable foundation for installing other components.

[0033] A first rubber cylinder 3 is provided at the bottom end of the upper joint 1, a first spacer ring 6 is provided at the bottom end of the first rubber cylinder 3, a second rubber cylinder 4 is provided at the bottom end of the first spacer ring 6, a second spacer ring 7 is provided at the bottom end of the second rubber cylinder 4, and a third rubber cylinder 5 is provided at the bottom end of the second spacer ring 7. The first rubber cylinder 3, the second rubber cylinder 4 and the third rubber cylinder 5 are all rubber sealing elements contacting the well wall, which will expand when squeezed to form a seal with the well wall.

[0034] A pressure joint 2 is provided at the bottom end of the third rubber cylinder 5, a pressure plate 12 is fixed to the inner wall in the middle of the pressure joint 2, a pressure rod 8 is provided inside the pressure plate 12, a pressure head 9 is provided at the top of the pressure rod 8, a connecting rod 11 is provided on the outer wall of the pressure rod 8, there are multiple connecting rods 11, one end of several connecting rods 11 are respectively fixedly connected to the upper joint 1, the first spacer ring 6, and the second spacer ring 7. When the permanent packer is used for gas well production, after the packer is transported to the designated isolation position, the pressure head 9 is pressurized by hydraulic equipment to make the pressure rod 8 descend, and the pressure rod 8 is fixedly connected to the upper joint 1, the first spacer ring 6 and the second spacer ring 7 through the connecting rod 11, thereby driving the upper joint 1, the first spacer ring 6 and the second spacer ring 7 to descend.

[0035] A through hole is provided in the center of the pressure plate 12, and there is an interference fit between the pressure plate 12 and the pressure rod 8. During the descent process, the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are pressurized respectively through the upper joint 1, the first spacer ring 6 and the second spacer ring 7, so that the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are deformed and expanded under pressure, so that the outer walls of the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 are sealed with the well wall of the gas well. The pressure rod 8 is connected with the pressure plate 12 through an interference fit, which can prevent the pressure rod 8 from rising back, and can keep the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 under pressure and expansion. The three rubber tubes are expanded and sealed at the same time to ensure the permanent sealing effect of the packer; A conical step head 13 is provided at the bottom end of the pressure rod 8, and a swing rod 18 is rotatably provided on the inner wall of the pressure joint 2. A pressure rod 19 is provided at one end of the swing rod 18, and one side of the pressure rod 19 abuts against the step surface of the conical step head 13. A torsion spring shaft 17 is provided at one end of the swing rod 18, and fixed seats 16 are provided at both ends of the torsion spring shaft 17, and one side of the fixed seat 16 is fixedly connected to the inner wall of the pressure joint 2. During the downward pressing process of the pressure rod 8, the conical step head 13 will also drop accordingly. Through the step effect of the conical step head 13 and the elastic rotation connection of the torsion spring shaft 17 of the pressure rod 19, when the pressure rod 8 drops to the designed height, the pressure rod 19 can abut against the step of the conical step head 13, further preventing the pressure rod 8 from rising back and ensuring the permanent sealing effect of the packer; in this way, even if the external hydraulic pressure is removed, the pressure rod 8 will not rise due to its own weight or other factors, thereby ensuring the permanent sealing effect of the packer.

[0036] There are four torsion spring shafts 17, and the four torsion spring shafts 17 are evenly arranged circumferentially on the inner wall of the pressure-bearing joint 2. Four torsion spring shafts 17 mean that there are multiple points to provide reverse support force to prevent the pressure rod 8 from rebounding upward when the external pressure is lost. This design improves the redundancy of the system. Even if a torsion spring fails, the other torsion springs can continue to play a role. The evenly distributed design helps to balance the mechanical properties of the entire device, making the movement of the pressure rod 8 more consistent during the downward process, reducing the problems that may be caused by uneven force on one side.

[0037] In this embodiment, a conical pressing block 10 with a large top diameter and a small bottom diameter is fixed to the outer wall of the pressing rod 8. There are three conical pressing blocks 10, which are respectively located in the central area of ​​the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5. Elastic binding rings 15 are arranged on the inner walls of the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5. An expansion block 14 is arranged inside the elastic binding ring 15. There are multiple expansion blocks 14, and the multiple expansion blocks 14 can form a cylinder. The center of the cylinder formed by the expansion blocks 14 is provided with a conical hole 21 that matches the conical pressing block 10. When the pressing rod 8 descends, the conical pressing block 10 fixedly connected to the pressing rod 8 also descends. The conical design of the conical pressing block 10 with a large top diameter and a small bottom diameter can make the expansion block 14 expand outward to support the expanded rubber tube, prevent the rubber tube from shrinking, and further improve the permanent sealing effect of the packer.

[0038] The expansion block 14 is in the shape of a quarter cylinder, and the inner wall of the expansion block 14 is provided with a notch for enclosing the tapered hole 21. The outer wall of the expansion block 14 at the top fits with the inner wall of the first rubber cylinder 3, the outer wall of the expansion block 14 at the middle fits with the inner wall of the second rubber cylinder 4, and the outer wall of the expansion block 14 at the bottom fits with the inner wall of the third rubber cylinder 5. The expansion block 14 is designed to be in the shape of a quarter cylinder, which means that four expansion blocks 14 can be combined to form a complete cylinder. Each expansion block 14 has a notch on its inner wall, and these notches can form a tapered hole 21 that matches the tapered pressing block 10 in the combined state.

[0039] When the pressure rod (8) descends, the conical pressure block (10) fixed thereon gradually enters the conical hole (21) formed by the expansion block (14). Since the diameter of the conical pressure block (10) gradually decreases from top to bottom, when it enters the conical hole of the expansion block (14), it forces the expansion block (14) to move outward. The outer side of the expansion block (14) pushes the rubber tube to expand outward, thereby forming a seal between the rubber tube and the well wall.

[0040] The height of the expansion block 14 is less than the height of the rubber tube 3. The first spacer ring 6 has the same structure as the second spacer ring 7. The outer diameter of the first spacer ring 6 is the same as the outer diameter of the first rubber tube 3, and the inner diameter of the first spacer ring 6 is the same as the first rubber tube 3. The height of the expansion block 14 is less than the height of the rubber tube. This means that the expansion block 14 only occupies a part of the space inside the rubber tube, rather than running through the entire length of the rubber tube. This design may be to ensure that when the pressure rod 8 descends, the expansion block 14 can effectively push the rubber tube to expand.

[0041] The elastic binding ring 15 is provided with connection points 20 on both sides inside and outside, and there are several connection points 20. Several connection points 20 located on the inner side are connected and fixed with the expansion block 14 by glue, and several connection points 20 located on the outer side are respectively connected with the first rubber tube 3, the second rubber tube 4 and the third rubber tube 5 by glue. The elastic binding ring 15 is an elastic annular component, and its main function is to maintain the position of the expansion block 14. The connection points on the inner side of the elastic binding ring 15 are connected and fixed with the expansion block 14 by glue. In this way, it can be ensured that when the pressure rod 8 is pressed down, the expansion block 14 can expand outward smoothly.

[0042] The first rubber tube 3 , the second rubber tube 4 and the third rubber tube 5 have the same structure, and the outer diameters of the first rubber tube 3 , the second rubber tube 4 and the third rubber tube 5 are the same as the outer diameter of the bottom of the upper joint 1 .

[0043] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A permanent packer for gas well production, comprising an upper joint (1), a pressure-bearing joint (2) and a first rubber sleeve (3), characterized in that: The upper joint (1) is provided with a first rubber cylinder (3) at the bottom end, a first spacer ring (6) at the bottom end, a second rubber cylinder (4) at the bottom end, a second spacer ring (7) at the bottom end, a third rubber cylinder (5) at the bottom end, and a pressure-bearing joint (2) at the bottom end. A pressure-bearing plate (12) is fixed to the inner wall of the middle part of the pressure-bearing joint (2). A pressure rod (8) is provided inside the pressure-bearing plate (12). A pressure head (9) is provided at the top end of the pressure rod (8). A connecting rod (11) is provided on the outer wall of the pressure rod (8). There are a plurality of connecting rods (11). One end of a plurality of the connecting rods (11) is fixedly connected to the upper joint (1), the first spacer ring (6), and the second spacer ring (7) respectively. A through hole is provided in the center of the pressure plate (12). An interference fit is formed between the pressure plate (12) and the pressure rod (8).

2. A permanent packer for gas well production according to claim 1, characterized in that: A conical pressing block (10) having a large top diameter and a small bottom diameter is fixed to the outer wall of the pressing rod (8). There are three conical pressing blocks (10), which are respectively located in the central area of ​​the first rubber cylinder (3), the second rubber cylinder (4) and the third rubber cylinder (5). An elastic binding ring (15) is provided on the inner wall of the first rubber cylinder (3), the second rubber cylinder (4) and the third rubber cylinder (5). An expansion block (14) is provided on the inner side of the elastic binding ring (15). There are multiple expansion blocks (14), and the multiple expansion blocks (14) can form a cylinder. A conical hole (21) matching the conical pressing block (10) is opened in the center of the cylinder formed by the expansion blocks (14).

3. A permanent packer for gas well production according to claim 1, characterized in that: A conical stepped head (13) is provided at the bottom end of the pressure rod (8), a swing rod (18) is rotatably provided on the inner wall of the pressure-bearing joint (2), a pressure rod (19) is provided at one end of the swing rod (18), and one side of the pressure rod (19) abuts against the stepped surface of the conical stepped head (13).

4. A permanent packer for gas well production according to claim 3, characterized in that: A torsion spring shaft (17) is provided at one end of the swing rod (18), and fixing seats (16) are provided at both ends of the torsion spring shaft (17), and one side of the fixing seat (16) is fixedly connected to the inner wall of the pressure-bearing joint (2).

5. A permanent packer for gas well production according to claim 1, characterized in that: The elastic binding ring (15) is provided with connection points (20) on both inner and outer sides. There are a plurality of connection points (20). The plurality of connection points (20) located on the inner side are connected and fixed to the expansion block (14) by glue, and the plurality of connection points (20) located on the outer side are respectively connected to the first rubber tube (3), the second rubber tube (4) and the third rubber tube (5) by glue.

6. A permanent packer for gas well production according to claim 1, characterized in that: The first rubber cylinder (3), the second rubber cylinder (4) and the third rubber cylinder (5) have the same structure, and the outer diameters of the first rubber cylinder (3), the second rubber cylinder (4) and the third rubber cylinder (5) are the same as the outer diameter of the bottom of the upper joint (1).

7. A permanent packer for gas well production according to claim 4, characterized in that: There are four torsion spring rotating shafts (17), and the four torsion spring rotating shafts (17) are evenly arranged in the circumferential direction on the inner wall of the pressure-bearing joint (2).

8. A permanent packer for gas well production according to claim 1, characterized in that: The expansion block (14) is in the shape of a quarter cylinder, and a notch is provided on the inner wall of the expansion block (14) for enclosing the tapered hole (21).

9. A permanent packer for gas well production according to claim 1, characterized in that: The outer wall of the expansion block (14) at the top is in contact with the inner wall of the first rubber tube (3), the outer wall of the expansion block (14) at the middle is in contact with the inner wall of the second rubber tube (4), and the outer wall of the expansion block (14) at the bottom is in contact with the inner wall of the third rubber tube (5).

10. A permanent packer for gas well production according to claim 9, characterized in that: The height of the expansion block (14) is smaller than the height of the rubber tube (3); the first spacer ring (6) and the second spacer ring (7) have the same structure; the outer diameter of the first spacer ring (6) is the same as the outer diameter of the first rubber tube (3); and the inner diameter of the first spacer ring (6) is the same as the first rubber tube (3).

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