A tubing patcher

Abstract

The utility model discloses an oil pipe patching device belongs to oil exploitation technical field. The oil pipe patching device includes outer cylinder and slip, is equipped with reversing mechanism, slip cover, high pressure sealing mechanism, stroke adjusting mechanism and low pressure sealing mechanism from top to bottom in succession in the outer cylinder, the slip cover is connected with the outer cylinder through several shear nails, is equipped with the retreat stop mechanism in the outer cylinder, and the retreat stop mechanism is covered on the slip cover, the slip is located in the outer cylinder, and the upper end of slip is connected with the lower end of reversing mechanism, and the slip is located the upside of slip cover. When high pressure sealing mechanism deformation forms high pressure sealing between the gap between outer cylinder and fractured oil pipe, the retreat stop mechanism clamps the slip cover, and the high pressure sealing reliability of oil pipe patching device is improved significantly. When need to unfasten the fractured oil pipe, slowly press down the oil pipe patching device, and the slip and slip cover keep the state of separation under the action of reversing mechanism, and only need the small force to lift the oil pipe patching device, can make it and the fractured oil pipe separate.

Description

Technical Field

[0001] This utility model relates to an oil pipe connector, belonging to the field of oil 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] During the lifting of the aforementioned connector, the inner cylinder, under tension, descends and squeezes the lead seal retaining ring and the lead seal ring, causing the lead seal ring to deform and fill the gap between the connector and the retrieval casing, achieving a high-pressure seal. However, when the connector is no longer lifted, the lead seal ring will automatically return to its original shape, causing the high-pressure sealing performance of the connector to drop sharply or even be lost. Therefore, the high-pressure sealing reliability of this connector needs further improvement. Furthermore, when it is necessary to disconnect the casing, the connector is first pressed down to move the slips above the locking spiral inclined surface on the inner cylinder, and then the connector is lifted to separate it from the casing. However, when lifting the connector, the slips and casing move downwards relative to the connector under gravity. The slips will re-contact the locking spiral inclined surface on the inner cylinder, and then, under the pressure of the locking spiral inclined surface, they will re-grip the casing, making it difficult to achieve normal separation of the connector from the casing. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an oil pipe repair device.

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

[0007] An oil pipe connector includes an outer cylinder and slips. The outer cylinder contains, from top to bottom, a reversing mechanism, a slip sleeve, a high-pressure sealing mechanism, a stroke adjustment mechanism, and a low-pressure sealing mechanism. The slip sleeve is connected to the outer cylinder by several shear pins. The outer cylinder contains a backstop mechanism that is fitted onto the slip sleeve. The slips are located inside the outer cylinder, with their upper ends connected to the lower ends of the reversing mechanism and positioned above the slip sleeve.

[0008] The outer cylinder includes an upper connector, a connecting cylinder, a low-pressure sealing section outer cylinder, 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 upper end of the low-pressure sealing section outer cylinder is connected to the lower end of the connecting cylinder through the high-pressure sealing section outer cylinder. The upper end of the positive rotation guide shoe is connected to the lower end of the 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 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-pressure sealing mechanism includes packing sleeve A, support ring, high-pressure sealing rubber cylinder, support ring and packing sleeve A arranged sequentially 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 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-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] 1. When the high-pressure sealing mechanism deforms to form a high-pressure seal between the outer cylinder and the broken oil pipe, the anti-reverse mechanism locks the slip sleeve to prevent the slip sleeve from moving upward relative to the outer cylinder, thereby keeping the high-pressure sealing mechanism in a state of pressure deformation, so as to continuously perform high-pressure sealing on the gap between the outer cylinder and the broken oil pipe, which significantly improves the high-pressure sealing reliability of the oil pipe repairer.

[0022] 2. When it is necessary to disconnect the broken oil pipe, slowly press down the oil pipe connector. The slips will move up to the top of the slip sleeve under the push of the broken oil pipe, and will remain disengaged from the slip sleeve under the action of the reversing mechanism. Then rotate the oil pipe connector to make the anti-reverse mechanism push the slip sleeve up a certain distance. The pressure on the high-pressure sealing mechanism will gradually decrease, and it will gradually return to its original state and no longer squeeze 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. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 for Figure 1 A magnified view of a portion at point A;

[0025] Figure 3 for Figure 1 A magnified view of the area at point B;

[0026] Figure 4 This is a schematic diagram of the reversing cylinder of this utility model;

[0027] Figure 5 This is an unfolded view of the guide groove of this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the chuck of this utility model;

[0029] Figure 7 This is a half-sectional view of the C-type anti-reverse ring of this utility model;

[0030] Figure 8 This is a schematic diagram of the main structure of the C-type anti-reverse ring of this utility model.

[0031] 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-Slipper sleeve, 100-Upper clamping tooth, 11-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-Positive rotation guide shoe. Detailed Implementation

[0032] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0033] like Figures 1 to 8As shown, the 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, a slip sleeve 10, a high-pressure sealing mechanism, a stroke adjustment mechanism, and a low-pressure sealing mechanism. 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 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 sleeve 10. 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 low-pressure sealing mechanism, stroke adjustment mechanism, high-pressure sealing mechanism, slip sleeve 10, and slip 9, and is inserted into the reversing mechanism. Lift the broken tubing using the tubing connector. At this point, the low-pressure sealing mechanism contacts the outer wall of the broken tubing and forms a low-pressure seal. Simultaneously, slip 9 grips the broken tubing, and the lower end of slip 9 begins to enter the slip sleeve 10. Continue passing through... The tubing repairer lifts the broken tubing, wedges slip 9 and slip sleeve 10 tightly, and grips the broken tubing firmly. The shearing force on the shear pin 13 gradually increases and eventually shears it off. Slip 9, slip sleeve 10, and the broken tubing move downward relative to the outer cylinder, compressing the high-pressure sealing mechanism. This deforms the high-pressure sealing mechanism, creating a high-pressure seal between the outer cylinder and the broken tubing. Simultaneously, the anti-reverse mechanism locks slip sleeve 10, preventing it from moving upward relative to the outer cylinder. This keeps the high-pressure sealing mechanism in a compressed and 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 is 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.

[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-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] The outer cylinder includes an upper connector 1, a connecting cylinder 8, a low-pressure sealing section outer cylinder 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 upper end of the low-pressure sealing section outer cylinder 22 is connected to the lower end of the connecting cylinder 8 via a 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 low-pressure sealing section outer cylinder 22. The upper connector 1, guide outer cylinder 5, connecting cylinder 8, high-pressure sealing section outer cylinder 14, low-pressure sealing section outer cylinder 22, and positive rotation guide shoe 24 are threaded together.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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 pressure sealing mechanism.

[0042] 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.

[0043] The high-pressure sealing mechanism includes packing sleeve A15, support ring 19, high-pressure sealing rubber cylinder 18, support ring 19 and packing sleeve A15 arranged sequentially 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.

[0044] The low-pressure sealing mechanism includes a packing sleeve B23, which has multiple mounting grooves B circumferentially arranged inside the packing sleeve B, 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 working sealing pressure of 50MPa, and an ambient temperature tolerance of -20℃ to 200℃.

[0045] 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 repair device 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 repair device is slowly lifted, 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.

[0046] 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-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 rubber cylinder 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.

[0047] The working principle or usage process of the oil pipe repair device described in this utility model is as follows:

[0048] 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.

[0049] 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 low-pressure sealing mechanism, stroke adjustment mechanism, high-pressure sealing mechanism, slip sleeve 10 and 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.

[0050] 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 the low-pressure sealing mechanism will open inward under the frictional force applied by the broken oil pipe, thereby increasing the frictional 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-pressure sealing mechanism also provides a reliable low-pressure seal on the outer wall of the broken oil pipe. The V-shaped sealing packing 16 is made of fluororubber, with a standard grade of FKM, and a temperature resistance of -20℃ to 200℃.

[0051] The broken tubing continues to be lifted using the tubing repair device. 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 sleeve 18 in the high-pressure sealing mechanism. This deforms the high-pressure sealing sleeve 18, creating 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 and 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 repair device. At this point, the new tubing has been connected to the broken tubing via the tubing repair device, allowing the tubing to quickly regain its function as an oil transport channel, completing the tubing repair work.

[0052] 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 5 In 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 tubing patching adapter, characterized by: 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), a high-pressure sealing mechanism, a stroke adjustment mechanism, and a low-pressure sealing mechanism. The slip sleeve (10) is connected to the outer cylinder by 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 tubing connector as described in claim 1, characterized in that: The outer cylinder includes an upper connector (1), a connecting cylinder (8), a low-pressure sealing section outer cylinder (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). The upper end of the low-pressure sealing section outer cylinder (22) is connected to the lower end of the connecting cylinder (8) through the 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 low-pressure sealing section outer cylinder (22).

3. The tubing 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 tubing connector 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 tubing connector 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 tubing connector 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 pressure sealing mechanism.

7. The tubing 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 tubing connector as described in claim 1, characterized in that: The 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 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 tubing 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 tubing 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 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 in the annular groove on the adjustment sleeve (20).

Images