A high-temperature and high-pressure oil pipe connector

Abstract

The utility model discloses a high temperature and high pressure oil pipe patching device belongs to the technical field of oil exploitation, including multiple high temperature and high pressure sealing mechanism and multiple high temperature and low pressure sealing mechanism, multiple high temperature and high pressure sealing mechanism between the adjacent two high temperature and high pressure sealing mechanism is equipped with the shaft sleeve, the slip sleeve is connected with the outer cylinder through several shearing nails, be equipped with the retreat prevention mechanism in the outer cylinder, and the retreat prevention mechanism is covered on the slip sleeve, the slip is located in the outer cylinder, and the upper end of slip is connected with the lower end of the reversing mechanism, and the slip is located the upside of slip sleeve. Set up multiple high temperature and high pressure sealing mechanism in the oil pipe patching device, and utilize the retreat prevention mechanism to prevent the slip sleeve from moving up relative to the outer cylinder, reduce the risk of all high temperature and high pressure sealing mechanism failure simultaneously, guarantee the oil production efficiency while guaranteeing that oil production work can develop normally, the sealing element adopts the high temperature resistant material to make, improved the high temperature resistant performance of oil pipe patching device.

Description

Technical Field

[0001] This utility model relates to a high-temperature and high-pressure oil pipe repair device, belonging to the field of petroleum extraction technology. Background Technology

[0002] Oil extraction refers to the process of extracting crude oil from underground reservoirs and is one of the core links in the petroleum industry. During oil extraction, pipelines are the crucial channels connecting the downhole reservoir to the surface production system. However, as oil extraction progresses into the later stages, accidents such as pipeline wear-through or breakage frequently occur, severely impacting extraction efficiency and increasing costs. Therefore, manual intervention is required to repair and reconnect the pipelines, quickly restoring their function as oil transport channels.

[0003] Chinese patent CN215860069U discloses an easily introduced removable lead-sealed oil casing repair device, including an upper connector and an outer cylinder. The upper part of the upper connector is provided with an internal thread that matches the oil casing to be repaired. The lower part of the upper connector is fixedly connected to the upper end of the outer cylinder. An inner cylinder is also provided inside the outer cylinder. The upper end of the inner cylinder is provided with a matching end spline corresponding to the lower end of the upper connector for transmitting torque. A slip is provided inside the inner cylinder, and the inner surface of the inner cylinder is provided with a locking threaded bevel that mates with the slip. A slip limiting groove for limiting the slip is provided at the lower end of the slip inside the inner cylinder. A slip control clip is provided on the lower side of the slip limiting groove to fix the position of the slip. A lead-sealed ring is also provided at the lower end of the inner cylinder, and lead-sealed retaining rings are provided on the upper and lower sides of the lead-sealed ring. It can ensure that the slips are fixed in the inner cylinder in real time. When used on site, it can be introduced into the downhole casing in one go, so as to complete the repair operation smoothly without having to lift and lower it many times, saving working time and improving work efficiency. The spline design at the end between the upper connector and the inner cylinder can ensure normal torque transmission while the inner cylinder axially moves to squeeze the lead seal ring and the lead seal ring deforms and high pressure seals, so that the tool can be taken out of the hand when needed.

[0004] However, the aforementioned connector only uses a lead seal ring to achieve high-pressure sealing of the gap between the connector and the retrieval casing. When the connector is working in a high-temperature and high-pressure environment, the lead seal ring is at high risk of failure. Failure of the lead seal ring will lead to a decrease in oil production efficiency and may even prevent the normal operation of oil production. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a high-temperature and high-pressure oil pipe repair device.

[0006] This utility model is achieved through the following technical solution:

[0007] A high-temperature and high-pressure oil pipe connector includes an outer cylinder and slips. The outer cylinder contains, from top to bottom, a reversing mechanism, a slip sleeve, multiple high-temperature and high-pressure sealing mechanisms, a stroke adjustment mechanism, and multiple high-temperature and low-pressure sealing mechanisms. A bushing is provided between adjacent high-temperature and high-pressure sealing mechanisms. The slip sleeve is connected to the outer cylinder via several shear pins. The outer cylinder contains a backstop mechanism, which is fitted onto the slip sleeve. The slips are located within the outer cylinder, with their upper ends connected to the lower ends of the reversing mechanism, and are positioned above the slip sleeve.

[0008] The outer cylinder includes an upper connector, a connecting cylinder, multiple high-pressure sealing section outer cylinders, multiple low-pressure sealing section outer cylinders, and a positive rotation guide shoe. The upper end of the connecting cylinder is connected to the lower end of the upper connector through the guide outer cylinder. The multiple high-pressure sealing section outer cylinders are connected end to end in sequence, and the upper end of the uppermost high-pressure sealing section outer cylinder is connected to the lower end of the connecting cylinder. The multiple low-pressure sealing section outer cylinders are connected end to end in sequence, and the upper end of the uppermost low-pressure sealing section outer cylinder is connected to the lower end of the lowermost high-pressure sealing section outer cylinder. The upper end of the positive rotation guide shoe is connected to the lower end of the lowermost low-pressure sealing section outer cylinder.

[0009] The reversing mechanism includes a buffer assembly, a reversing cylinder, and several guide pins. The upper end of the reversing cylinder is connected to the lower end of the buffer assembly. A reversing guide groove is provided on the outer wall of the reversing cylinder, and an oil pipe limiting step is provided on the inner wall of the reversing cylinder near the buffer assembly. Several guide pins are evenly distributed on the outer cylinder, and one end of the guide pin extends into the reversing guide groove.

[0010] The buffer assembly includes an outer straightening cylinder, an inner straightening cylinder, and a spring. The upper end of the outer straightening cylinder is fixedly connected to the outer cylinder body. The upper end of the inner straightening cylinder is inserted into the outer straightening cylinder and slidably connected to it. The lower end of the inner straightening cylinder is connected to the upper end of the reversing cylinder. The spring is fitted onto the outer and inner straightening cylinders, with one end connected to the upper end of the outer straightening cylinder and the other end connected to the lower end of the inner straightening cylinder.

[0011] The reversing guide groove includes an annular groove arranged circumferentially along the reversing cylinder. Multiple upper long grooves and multiple upper short grooves are alternately opened on the upper side of the annular groove, and an upper guide slope is provided between the upper long grooves and the upper short grooves. Multiple lower short grooves are alternately opened on the lower side of the annular groove, and a lower guide slope is provided between two adjacent lower short grooves.

[0012] The upper long slot, upper short slot, and lower short slot are all arranged along the axial direction of the reversing cylinder, and the lower short slot is staggered from the upper long slot and upper short slot in the circumferential direction of the reversing cylinder.

[0013] The lower part of the outer wall of the slip is conical, and the inner wall of the lower part of the slip is provided with teeth. The lower part of the slip is provided with multiple slots evenly distributed in the circumferential direction.

[0014] The upper end of the slip sleeve is coaxially provided with a tapered hole, the outer wall of the middle part of the slip sleeve is provided with upper locking teeth, and the lower end face of the slip sleeve abuts against the upper end face of the high temperature and high pressure sealing mechanism.

[0015] The anti-reverse mechanism includes a back tightening nut and a C-type anti-reverse ring. The back tightening nut has an external thread that is threaded to the outer cylinder. The C-type anti-reverse ring is movably fitted on the slip sleeve. One end of the C-type anti-reverse ring is axially limited by the back tightening nut, and the other end is axially limited by the stepped surface B inside the outer cylinder. The inner wall of the C-type anti-reverse ring has lower locking teeth.

[0016] The high-temperature and high-pressure sealing mechanism includes packing sleeve A, support ring, high-pressure sealing rubber cylinder, support ring and packing sleeve A arranged from top to bottom. The inner wall of packing sleeve A is provided with a mounting groove A along the circumferential direction, and a packing assembly is provided in the mounting groove A.

[0017] The high-temperature and low-pressure sealing mechanism includes a packing sleeve B, which has multiple mounting grooves B circumferentially arranged inside the packing sleeve B, and a packing assembly is provided in the mounting grooves B.

[0018] The packing assembly includes two packing rings and multiple V-shaped sealing packings, all of which are located between the two packing rings with the V-shaped openings of the V-shaped sealing packings facing upwards.

[0019] The stroke adjustment mechanism includes an adjustment sleeve and a limiting ring. The adjustment sleeve has an external thread that is threaded to the outer cylinder, and the upper end face of the adjustment sleeve abuts against the lower end face of the high temperature and high pressure sealing mechanism. An annular groove is formed on the outer wall of the adjustment sleeve along the circumferential direction, and the limiting ring is installed in the annular groove on the adjustment sleeve.

[0020] The beneficial effects of this utility model are as follows:

[0021] First, multiple high-temperature and high-pressure sealing mechanisms are installed within the tubing connector to create a high-pressure seal between the outer cylinder and the broken tubing. Even if some of these mechanisms fail under high temperature and pressure, the remaining intact mechanisms can continue to provide a high-pressure seal, improving the high-pressure sealing performance and reliability of the tubing connector. Second, after the tubing connection is completed, a retaining mechanism secures the slip sleeve, preventing it from moving upwards relative to the outer cylinder. This keeps all high-temperature and high-pressure sealing mechanisms under pressure and deformation, ensuring continuous high-pressure sealing between the outer cylinder and the broken tubing. This significantly improves the high-pressure sealing reliability of the tubing connector and greatly reduces the risk of simultaneous failure of all high-temperature and high-pressure sealing mechanisms, guaranteeing both normal oil production operations and production efficiency. Finally, the sealing elements in both the high-temperature and high-pressure sealing mechanisms and the high-temperature and low-pressure sealing mechanisms are made of high-temperature resistant materials, improving the high-temperature resistance of the tubing connector. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of a portion at point A;

[0024] Figure 3 for Figure 1 A magnified view of the area at point B;

[0025] Figure 4 This is a schematic diagram of the reversing cylinder of this utility model;

[0026] Figure 5 This is an unfolded view of the guide groove of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the chuck of this utility model;

[0028] Figure 7 This is a half-sectional view of the C-type anti-reverse ring of this utility model;

[0029] Figure 8 This is a schematic diagram of the main structure of the C-type anti-reverse ring of this utility model.

[0030] In the diagram: 1-Upper connector, 2-Spring, 3-Outer centralizing cylinder, 4-Inner centralizing cylinder, 5-Guide outer cylinder, 6-Reversing cylinder, 60-Oil pipe limiting step, 61-Reversing guide groove, 610-Annular groove, 611-Upper long groove, 612-Upper short groove, 613-Upper guide slope, 614-Lower short groove, 615-Lower guide slope, 7-Guide pin, 8-Connecting cylinder, 9-Slip, 90-Groove, 91-Clamping tooth, 10- Slip sleeve, 100-Upper clamping tooth, 11-Back tightening nut, 12-C-type anti-reverse ring, 120-Lower clamping tooth, 13-Shear pin, 14-High pressure sealing section outer cylinder, 15-Packing sleeve A, 16-V-type sealing packing, 17-Packing gasket ring, 18-High pressure sealing rubber sleeve, 19-Support ring, 20-Adjusting sleeve, 21-Limiting ring, 22-Low pressure sealing section outer cylinder, 23-Packing sleeve B, 24-Straight rotation guide shoe, 25-Shaft sleeve. Detailed Implementation

[0031] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0032] like Figures 1 to 8As shown, the high-temperature and high-pressure oil pipe connector of this utility model includes an outer cylinder and slips 9. The outer cylinder contains, from top to bottom, a reversing mechanism, slip sleeves 10, multiple high-temperature and high-pressure sealing mechanisms, a stroke adjustment mechanism, and multiple high-temperature and low-pressure sealing mechanisms. Among the multiple high-temperature and high-pressure sealing mechanisms, a bushing 25 is provided between two adjacent high-temperature and high-pressure sealing mechanisms. The slip sleeves 10 are connected to the outer cylinder through several shear pins 13. The outer cylinder contains a backstop mechanism, which is sleeved on the slip sleeves 10. The slips 9 are located inside the outer cylinder, with the upper end of the slips 9 connected to the lower end of the reversing mechanism, and the slips 9 are located on the upper side of the slip sleeves 10.

[0033] Connect the new tubing to the lower end of the drill pipe, and connect the tubing connector to the lower end of the new tubing. Then, slowly rotate and lower the tubing connector to guide the upper end of the broken tubing into the outer cylinder. Next, continue lowering the tubing connector so that the upper end of the broken tubing passes from bottom to top through the high-temperature low-pressure sealing mechanism, the stroke adjustment mechanism, the high-temperature high-pressure sealing mechanism, the slip sleeve 10, and the slips 9, and is inserted into the reversing mechanism. Lift the broken tubing using the tubing connector. At this point, the high-temperature low-pressure sealing mechanism contacts the outer wall of the broken tubing and forms a low-pressure seal on the outer wall of the broken tubing. Simultaneously, the slips 9 grip the broken tubing, and the lower end of the slips 9 begins to enter the slip sleeve 10. Continue lifting the broken tubing using the tubing connector, and the slips 9 and... The slip sleeve 10 is wedged tightly, and the slip 9 grips the broken tubing. The shearing force on the shear pin 13 gradually increases and eventually shears it off. The slip 9, slip sleeve 10, and broken tubing move downward relative to the outer cylinder, compressing all the high-temperature and high-pressure sealing mechanisms. Axial force is transmitted between adjacent high-temperature and high-pressure sealing mechanisms through the bushing 25, thereby deforming all the high-temperature and high-pressure sealing mechanisms to form a high-pressure seal between the outer cylinder and the broken tubing. At the same time, the anti-reverse mechanism locks the slip sleeve 10, preventing it from moving upward relative to the outer cylinder, thus keeping all the high-temperature and high-pressure sealing mechanisms in a compressed and deformed state to continuously provide a high-pressure seal between the outer cylinder and the broken tubing, significantly improving the high-pressure sealing reliability of the tubing repairer. At this point, the new tubing has been connected to the broken tubing through the tubing repairer, allowing the tubing to quickly regain its function as an oil transport channel, completing the tubing repair work.

[0034] When it is necessary to disconnect the broken oil pipe, slowly press down the oil pipe connector. The slip 9 moves up above the slip sleeve 10 under the push of the broken oil pipe, and remains detached from the slip sleeve 10 under the action of the reversing mechanism. Then rotate the oil pipe connector to make the anti-reverse mechanism push the slip sleeve 10 up a certain distance. The pressure on the high temperature and high pressure sealing mechanism gradually decreases, and it gradually returns to its original state and no longer squeezes the outer wall of the broken oil pipe. Then, only a small force is needed to lift the oil pipe connector to separate it from the broken oil pipe.

[0035] First, multiple high-temperature and high-pressure sealing mechanisms are installed within the tubing connector to create a high-pressure seal between the outer cylinder and the broken tubing. Even if some of these mechanisms fail under high temperature and pressure, the remaining intact mechanisms can continue to provide a high-pressure seal, improving the high-pressure sealing performance and reliability of the tubing connector. Second, after the tubing connection is completed, a retaining mechanism is used to hold the slip sleeve 10 in place, preventing it from moving upwards relative to the outer cylinder. This keeps all the high-temperature and high-pressure sealing mechanisms under pressure and deformation, ensuring continuous high-pressure sealing between the outer cylinder and the broken tubing. This significantly improves the high-pressure sealing reliability of the tubing connector and greatly reduces the risk of simultaneous failure of all high-temperature and high-pressure sealing mechanisms, guaranteeing both normal oil production operations and production efficiency. Finally, the sealing elements in both the high-temperature and high-pressure sealing mechanisms and the high-temperature and low-pressure sealing mechanisms are made of high-temperature resistant materials, improving the high-temperature resistance of the tubing connector.

[0036] The outer cylinder includes an upper connector 1, a connecting cylinder 8, multiple high-pressure sealing section outer cylinders 14, multiple low-pressure sealing section outer cylinders 22, and a positive rotation guide shoe 24. The upper end of the connecting cylinder 8 is connected to the lower end of the upper connector 1 via a guide outer cylinder 5. The multiple high-pressure sealing section outer cylinders 14 are connected end-to-end in sequence, with the upper end of the uppermost high-pressure sealing section outer cylinder 14 connected to the lower end of the connecting cylinder 8. The multiple low-pressure sealing section outer cylinders 22 are connected end-to-end in sequence, with the upper end of the uppermost low-pressure sealing section outer cylinder 22 connected to the lower end of the lowermost high-pressure sealing section outer cylinder 14. The upper end of the positive rotation guide shoe 24 is connected to the lower end of the lowermost low-pressure sealing section outer cylinder 22. The upper connector 1, guide outer cylinder 5, connecting cylinder 8, high-pressure sealing section outer cylinders 14, low-pressure sealing section outer cylinders 22, and positive rotation guide shoe 24 are threaded together; the multiple high-pressure sealing section outer cylinders 14 and multiple low-pressure sealing section outer cylinders 22 are all threaded together. The number of outer cylinders 14 in the high-pressure sealing section is the same as the number of high-temperature and high-pressure sealing mechanisms, and the number of outer cylinders 22 in the low-pressure sealing section is the same as the number of high-temperature and low-pressure sealing mechanisms.

[0037] The reversing mechanism includes a buffer assembly, a reversing cylinder 6, and multiple guide pins 7. The upper end of the reversing cylinder 6 is connected to the lower end of the buffer assembly. A reversing guide groove 61 is provided on the outer wall of the reversing cylinder 6, and an oil pipe limiting step 60 is provided on the inner wall of the reversing cylinder 6 near the buffer assembly. Multiple guide pins 7 are evenly distributed on the outer cylinder, and one end of each guide pin 7 extends into the reversing guide groove 61.

[0038] The buffer assembly includes an outer centralizing cylinder 3, an inner centralizing cylinder 4, and a spring 2. The upper end of the outer centralizing cylinder 3 is fixedly connected to the upper connector 1. The upper end of the inner centralizing cylinder 4 is inserted into the outer centralizing cylinder 3 and slidably connected to it. The lower end of the inner centralizing cylinder 4 is connected to the upper end of the reversing cylinder 6. The spring 2 is fitted onto the outer centralizing cylinder 3 and the inner centralizing cylinder 4, with one end connected to the upper end of the outer centralizing cylinder 3 and the other end connected to the lower end of the inner centralizing cylinder 4. The buffer assembly has two functions: First, in the initial state, the spring 2 keeps the slip 9 in a fixed position through the inner centralizing cylinder 4 and the reversing cylinder 6. Second, after the tubing connector is lowered until the tubing limit step 60 contacts the upper end face of the broken tubing, the spring 2 is gradually compressed during the continued lowering of the tubing connector, providing a buffering and protective function for the upper end of the broken tubing.

[0039] The reversing guide groove 61 includes an annular groove 610 arranged around the reversing cylinder 6. The upper side of the annular groove 610 is provided with a plurality of upper long grooves 611 and a plurality of upper short grooves 612 at intervals, and an upper guide slope 613 is provided between the upper long grooves 611 and the upper short grooves 612. The lower side of the annular groove 610 is provided with a plurality of lower short grooves 614 at intervals, and a lower guide slope 615 is provided between two adjacent lower short grooves 614.

[0040] The upper long slot 611, the upper short slot 612 and the lower short slot 614 are all arranged along the axial direction of the reversing cylinder 6, and the lower short slot 614 is staggered from the upper long slot 611 and the upper short slot 612 in the circumferential direction of the reversing cylinder 6.

[0041] The lower part of the outer wall of the slip 9 is conical, and the inner wall of the lower part of the slip 9 is provided with teeth 91, and the lower part of the slip 9 is provided with multiple slots 90 evenly distributed in the circumferential direction.

[0042] The upper end of the slip sleeve 10 is coaxially provided with a tapered hole, the outer wall of the middle part of the slip sleeve 10 is provided with an upper locking tooth 100, and the lower end face of the slip sleeve 10 abuts against the upper end face of the high temperature and high pressure sealing mechanism.

[0043] The anti-reverse mechanism includes a back-tightening nut 11 and a C-shaped anti-reverse ring 12. The back-tightening nut 11 has an external thread that connects to the outer cylinder thread. The C-shaped anti-reverse ring 12 is movably fitted onto the slip sleeve 10. One end of the C-shaped anti-reverse ring 12 is axially limited by the back-tightening nut 11, and the other end is axially limited by the stepped surface B inside the outer cylinder. The inner wall of the C-shaped anti-reverse ring 12 has a lower locking tooth 120. In use, the locking tooth 120 is a unidirectional sawtooth, and the upper locking tooth 100 is a helical sawtooth.

[0044] The high-temperature and high-pressure sealing mechanism includes packing sleeve A15, support ring 19, high-pressure sealing tube 18, support ring 19 and packing sleeve A15 arranged from top to bottom. The inner wall of packing sleeve A15 is provided with a mounting groove A along the circumferential direction, and a packing assembly is provided in the mounting groove A.

[0045] The high-temperature, low-pressure sealing mechanism includes a packing sleeve B23, which has multiple mounting grooves B circumferentially arranged inside the packing sleeve B23, and a packing assembly is installed in each mounting groove B. The high-pressure sealing sleeve 18 is made of fluororubber or nitrile rubber, with a hardness of A75±5, a sealing pressure of 50MPa under working conditions, and can withstand an ambient temperature of -20℃ to 200℃.

[0046] The packing assembly includes two packing rings 17 and multiple V-shaped sealing packings 16. All V-shaped sealing packings 16 are located between two packing rings 17, with the V-shaped opening of the V-shaped sealing packings 16 facing upwards. When the tubing connector is lowered, the upper end of the broken tubing enters the outer cylinder under the guidance of the positive rotation guide shoe 24. The inner edge of the V-shaped sealing packing 16 contacts the outer wall of the broken tubing. When the tubing connector is slowly raised, the broken tubing moves downwards relative to the outer cylinder by a certain distance. During this process, the inner edge of the V-shaped sealing packing 16 opens inwards under the frictional force applied by the broken tubing, thereby increasing the frictional force between the V-shaped sealing packing 16 and the broken tubing, and achieving a reliable low-pressure seal on the outer wall of the broken tubing. The V-shaped sealing packings 16 are made of fluororubber, with a standard grade of FKM, and a temperature resistance of -20℃ to 200℃.

[0047] The stroke adjustment mechanism includes an adjusting sleeve 20 and a limiting ring 21. The adjusting sleeve 20 has an external thread that connects to the outer cylinder thread, and the upper end face of the adjusting sleeve 20 abuts against the lower end face of the high-temperature and high-pressure sealing mechanism. An annular groove is formed circumferentially on the outer wall of the adjusting sleeve 20, and the limiting ring 21 is installed in the annular groove on the adjusting sleeve 20. The adjusting sleeve 20 is used to axially limit the lower end of the packing sleeve A15 on the lower side of the high-pressure sealing sleeve 18. The lower end face of the limiting ring 21 contacts the upper end face of the outer cylinder 22 of the low-pressure sealing section. The limiting ring 21 is used to withstand the pressure transmitted from the adjusting sleeve 20 and has a protective function for the external thread on the adjusting sleeve 20 and the internal thread on the outer cylinder 22 of the low-pressure sealing section.

[0048] The working principle or usage process of the high-temperature and high-pressure oil pipe repair device of this utility model is as follows:

[0049] In the initial state, under the spring force of spring 2, the guide pin 7 engages with the upper short slot on the reversing cylinder 6 (i.e., Figure 5 In the 0# slot shown.

[0050] Connect the upper end of the new tubing to the lower end of the drill string, and connect the lower end of the new tubing to the upper end of the upper connector 1 in the tubing connector. Then, slowly rotate and lower the tubing connector, and guide the upper end of the broken tubing into the outer cylinder through the positive rotation guide shoe 24. Next, continue to lower the tubing connector, so that the upper end of the broken tubing passes through the high temperature and low pressure sealing mechanism, the stroke adjustment mechanism, the high temperature and high pressure sealing mechanism, the slip sleeve 10 and the slip 9 from bottom to top, and is inserted into the reversing mechanism. Then, the upper end of the broken tubing contacts the tubing limiting step 60 in the reversing cylinder 6, and pushes the reversing cylinder 6 to move upward relative to the outer cylinder until the spring 2 is compressed to the lower end of the inner centralizing cylinder 4 against the lower end of the outer centralizing cylinder 3. During this process, the guide pin 7 enters the lower short groove 614 (i.e., along the lower guide slope 615) along the lower guide slope 615. Figure 5 In the 2# slot shown.

[0051] Next, the tubing repair tool lifts the broken tubing, the slip 9 grips the broken tubing, and the lower end of the slip 9 begins to enter the slip sleeve 10. The guide pin 7 begins to enter the upper long groove 611 (i.e., along the upper guide slope 613) along the upper guide ramp 613. Figure 5 In the 3# groove shown, the inner edge of the V-shaped sealing packing 16 in all high-temperature and low-pressure sealing mechanisms will open inward under the action of the friction force applied by the broken oil pipe, thereby increasing the friction force between the V-shaped sealing packing 16 and the broken oil pipe, and achieving a reliable low-pressure seal on the outer wall of the broken oil pipe. Similarly, the packing assembly in the high-temperature and high-pressure sealing mechanism also provides a reliable low-pressure seal on the outer wall of the broken oil pipe.

[0052] The broken tubing continues to be lifted using the tubing repairer. The slips 9 and slip sleeve 10 are wedged tightly, and the slips 9 grip the broken tubing. The shearing force on the shear pin 13 gradually increases and eventually shears it off. The slips 9, slip sleeve 10, and broken tubing move downwards relative to the outer cylinder, compressing the high-pressure sealing sleeves 18 in all the high-temperature, high-pressure sealing mechanisms. Axial force is transmitted between adjacent high-temperature, high-pressure sealing mechanisms through the bushing 25, causing the high-pressure sealing sleeve 18 to deform and form a high-pressure seal between the outer cylinder and the broken tubing. Simultaneously, the upper locking tooth 100 on the slip sleeve 10 engages with the lower locking tooth 120 on the C-shaped anti-reverse ring 12, preventing the slip sleeve 10 from moving upwards relative to the outer cylinder. This keeps the high-pressure sealing sleeve 18 in a compressed, deformed state, continuously providing a high-pressure seal between the outer cylinder and the broken tubing, significantly improving the high-pressure sealing reliability of the tubing repairer. At this point, the new tubing has been connected to the broken tubing via the tubing repairer, allowing the tubing to quickly regain its function as an oil transport channel, completing the tubing repair work.

[0053] When it is necessary to disconnect the broken oil pipe, slowly lower the oil pipe repair tool. The slip 9, pushed upwards by the broken oil pipe, moves above the slip sleeve 10. The guide pin 7 enters the lower short groove 614 (i.e., along the lower guide ramp 615) along the lower guide slope 615. Figure 5In groove #4 (as shown), slip 9 detaches from the broken oil pipe, and then the oil pipe repair device is slowly lifted. The guide pin 7 enters the upper short groove 612 (i.e., along the upper guide slope 613) along the upper guide slope 613. Figure 5 In the 0# groove shown, keep the slip 9 and slip sleeve 10 detached; next, rotate the oil pipe connector, and under the action of the one-way saw teeth on the C-type anti-reverse ring 12 and the spiral saw teeth on the slip sleeve 10, push the slip sleeve 10 up a certain distance, and the pressure on the high-pressure sealing rubber sleeve 18 gradually decreases, and it gradually returns to its original state and no longer squeezes the outer wall of the broken oil pipe. Then, only a small force is needed to lift the oil pipe connector to separate it from the broken oil pipe.

Claims

1. A high-temperature, high-pressure oil pipe repair device, characterized in that: The device includes an outer cylinder and a slip (9). The outer cylinder contains, from top to bottom, a reversing mechanism, a slip sleeve (10), multiple high-temperature and high-pressure sealing mechanisms, a stroke adjustment mechanism, and multiple high-temperature and low-pressure sealing mechanisms. Among the multiple high-temperature and high-pressure sealing mechanisms, a bushing (25) is provided between two adjacent high-temperature and high-pressure sealing mechanisms. The slip sleeve (10) is connected to the outer cylinder through several shear pins (13). The outer cylinder contains a backstop mechanism, which is fitted onto the slip sleeve (10). The slip (9) is located inside the outer cylinder. The upper end of the slip (9) is connected to the lower end of the reversing mechanism, and the slip (9) is located on the upper side of the slip sleeve (10).

2. The high-temperature and high-pressure oil pipe repair device as described in claim 1, characterized in that: The outer cylinder includes an upper connector (1), a connecting cylinder (8), multiple high-pressure sealing section outer cylinders (14), multiple low-pressure sealing section outer cylinders (22), and a positive rotation guide shoe (24). The upper end of the connecting cylinder (8) is connected to the lower end of the upper connector (1) through the guide outer cylinder (5). Multiple high-pressure sealing section outer cylinders (14) are connected end to end in sequence, and the upper end of the uppermost high-pressure sealing section outer cylinder (14) is connected to the lower end of the connecting cylinder (8). Multiple low-pressure sealing section outer cylinders (22) are connected end to end in sequence, and the upper end of the uppermost low-pressure sealing section outer cylinder (22) is connected to the lower end of the lowermost high-pressure sealing section outer cylinder (14). The upper end of the positive rotation guide shoe (24) is connected to the lower end of the lowermost low-pressure sealing section outer cylinder (22).

3. The high-temperature and high-pressure oil pipe connector as described in claim 1, characterized in that: The reversing mechanism includes a buffer assembly, a reversing cylinder (6) and several guide pins (7). The upper end of the reversing cylinder (6) is connected to the lower end of the buffer assembly. A reversing guide groove (61) is provided on the outer wall of the reversing cylinder (6), and an oil pipe limiting step (60) is provided on the inner wall of the reversing cylinder (6) near the buffer assembly. Several guide pins (7) are evenly distributed on the outer cylinder, and one end of the guide pin (7) extends into the reversing guide groove (61).

4. The high-temperature and high-pressure oil pipe repair device as described in claim 3, characterized in that: The buffer assembly includes an outer straightening cylinder (3), an inner straightening cylinder (4), and a spring (2). The upper end of the outer straightening cylinder (3) is fixedly connected to the outer cylinder body. The upper end of the inner straightening cylinder (4) is inserted into the outer straightening cylinder (3) and slidably connected to the outer straightening cylinder (3). The lower end of the inner straightening cylinder (4) is connected to the upper end of the reversing cylinder (6). The spring (2) is fitted on the outer straightening cylinder (3) and the inner straightening cylinder (4), and one end of the spring (2) is connected to the upper end of the outer straightening cylinder (3), and the other end is connected to the lower end of the inner straightening cylinder (4).

5. The high-temperature and high-pressure oil pipe repair device as described in claim 3, characterized in that: The reversing guide groove (61) includes an annular groove (610) arranged circumferentially along the reversing cylinder (6). The upper side of the annular groove (610) is provided with a plurality of upper long grooves (611) and a plurality of upper short grooves (612) at intervals. An upper guide slope (613) is provided between the upper long grooves (611) and the upper short grooves (612). The lower side of the annular groove (610) is provided with a plurality of lower short grooves (614) at intervals. A lower guide slope (615) is provided between two adjacent lower short grooves (614). The upper long slot (611), upper short slot (612) and lower short slot (614) are all arranged along the axial direction of the reversing cylinder (6), and the lower short slot (614) is staggered from the upper long slot (611) and upper short slot (612) in the circumferential direction of the reversing cylinder (6).

6. The high-temperature and high-pressure oil pipe repair device as described in claim 1, characterized in that: The lower part of the outer wall of the slip (9) is conical, and the inner wall of the lower part of the slip (9) is provided with teeth (91), and the lower part of the slip (9) is provided with multiple slots (90) evenly distributed in the circumferential direction. The upper end of the slip sleeve (10) is coaxially provided with a tapered hole, the outer wall of the middle part of the slip sleeve (10) is provided with an upper locking tooth (100), and the lower end face of the slip sleeve (10) abuts against the upper end face of the high temperature and high pressure sealing mechanism.

7. The high-temperature and high-pressure oil pipe connector as described in claim 1, characterized in that: The anti-reverse mechanism includes a back tightening nut (11) and a C-type anti-reverse ring (12). The back tightening nut (11) has an external thread that is threaded to the outer cylinder. The C-type anti-reverse ring (12) is movably fitted on the slip sleeve (10). One end of the C-type anti-reverse ring (12) is axially limited by the back tightening nut (11), and the other end is axially limited by the stepped surface B inside the outer cylinder. The inner wall of the C-type anti-reverse ring (12) is provided with a lower locking tooth (120).

8. The high-temperature and high-pressure oil pipe repair device as described in claim 1, characterized in that: The high temperature and high pressure sealing mechanism includes packing sleeve A (15), support ring (19), high pressure sealing rubber cylinder (18), support ring (19) and packing sleeve A (15) arranged from top to bottom. The inner wall of packing sleeve A (15) is provided with a mounting groove A along the circumferential direction, and a packing assembly is provided in the mounting groove A. The high temperature and low pressure sealing mechanism includes a packing sleeve B (23), which has multiple mounting grooves B along its circumferential direction, and a packing assembly is provided in the mounting grooves B.

9. The high-temperature and high-pressure oil pipe connector as described in claim 8, characterized in that: The packing assembly includes two packing rings (17) and multiple V-shaped sealing packings (16), all of which are located between the two packing rings (17) with the V-shaped openings of the V-shaped sealing packings (16) facing upwards.

10. The high-temperature and high-pressure oil pipe connector as described in claim 1, characterized in that: The stroke adjustment mechanism includes an adjustment sleeve (20) and a limiting ring (21). The adjustment sleeve (20) is provided with an external thread that is threaded to the outer cylinder. The upper end face of the adjustment sleeve (20) abuts against the lower end face of the high temperature and high pressure sealing mechanism. An annular groove is provided on the outer wall of the adjustment sleeve (20) along the circumferential direction. The limiting ring (21) is installed at the annular groove on the adjustment sleeve (20).

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