Oil pipe supplementary connection method

Abstract

The invention discloses an oil pipe repairing and connecting method, and belongs to the technical field of oil exploitation. The method comprises the following steps that firstly, the position of a fractured oil pipe falling into the well bottom is determined, an oil pipe outer wall scraper is put into the well, then a fracture of the fractured oil pipe is trimmed through the oil pipe outer wall scraper, and dirt on the outer wall, close to the fracture, of the fractured oil pipe is scraped away; and secondly, the oil pipe outer wall scraping device is taken out of the well, a new oil pipe is connected to the lower end of the drill rod, the lower end of the new oil pipe is connected with an oil pipe supplementing and connecting device, then the oil pipe supplementing and connecting device is lowered into the well, then the broken oil pipe is communicated with the new oil pipe through the oil pipe supplementing and connecting device, and oil pipe supplementing and connecting work is completed. The oil pipe repair connection is time-saving and labor-saving, the efficiency is high, the fractured oil pipe falling into a well is effectively utilized, and the cost is low.

Description

Technical Field

[0001] The invention relates to an oil pipe patching method and belongs to the technical field of oil extraction. Background Art

[0002] Oil production, the process of extracting crude oil from underground reservoirs, is a core component of the oil industry. During this process, oil pipelines are the critical link between the underground reservoir and the surface production system. However, as oil production enters the middle and late stages, pipeline wear and tear or breakage often occur, severely impacting production efficiency and increasing costs.

[0003] A common treatment method is to first salvage all the oil pipes that have fallen into the bottom of the well and then lower new oil pipes into the well. However, this treatment method has the disadvantages of being time-consuming, inefficient and costly. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a method for patching an oil pipe.

[0005] The present invention is achieved through the following technical solutions: A method for patching an oil pipe comprises the following steps: Step 1: Identify the location of the broken oil pipe that has fallen to the bottom of the well, lower the oil pipe external scraper into the well, and then use the oil pipe external scraper to trim the fracture of the broken oil pipe and scrape off the dirt on the outer wall of the broken oil pipe near the fracture; Step 2: Remove the tubing scraper from the well, 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 lower the tubing connector into the well. Next, use the tubing connector to connect the broken tubing to the new tubing to complete the tubing patching work.

[0006] The oil pipe external scraper includes an outer cylinder B, an oil pipe fracture trimming mechanism and several oil pipe external scraping mechanisms. The oil pipe fracture trimming mechanism is arranged in the outer cylinder B. Several of the oil pipe external scraping mechanisms are arranged on the cylinder wall of the outer cylinder B and partially extend into the outer cylinder B. Several of the oil pipe external scraping mechanisms are located on the same side of the oil pipe fracture trimming mechanism.

[0007] The outer cylinder B includes an upper joint B, an extension tube and a guide shoe. One end of the extension tube is connected to one end of the upper joint B through the connecting tube B, and one end of the guide shoe is connected to the end of the extension tube away from the connecting tube B through the scraping tube. A retaining ring is provided inside the extension tube, which is limited radially by the extension tube and axially by an end face of the connecting tube B and a step surface on the inner wall of the extension tube.

[0008] The oil pipe fracture repair mechanism includes a grinding shoe body and a spring B. The grinding shoe body is located in the connecting tube B and is spline-connected to the connecting tube B. A hard alloy layer is provided on one end surface of the grinding shoe body. One end of the spring B is connected to the upper connector B, and the other end is connected to the end of the grinding shoe body away from the hard alloy layer. The grinding shoe body is provided with a plurality of liquid holes along the axial direction; The end of the grinding shoe body away from the spring B is coaxially connected to a centering guide rod, and the end of the centering guide rod away from the grinding shoe body is chamfered along the circumferential direction.

[0009] Two oil pipe outer scraping mechanisms are provided on the wall of the scraping cylinder, and the outer scraping components of the two oil pipe outer scraping mechanisms are staggered in the circumferential direction of the scraping cylinder; The oil pipe external scraping mechanism includes a plurality of external scraping components uniformly arranged on the wall of the scraping cylinder; A pressure plate mounting groove is provided on the outer wall of the scraping cylinder at a position corresponding to the outer scraping wall assembly, and a T-shaped sliding hole is provided at the bottom of the pressure plate mounting groove to communicate with the interior of the scraping cylinder; The outer scraping wall assembly includes a pressure plate and a T-shaped scraper. The pressure plate is located in the pressure plate mounting groove and is connected to the scraping cylinder through multiple screws. The T-shaped scraper is slidingly connected to the T-shaped sliding hole and is connected to the pressure plate through multiple compression springs. The T-shaped scraper partially extends into the scraping cylinder under the spring force of the compression spring.

[0010] The method of using the oil pipe external scraper to trim the fracture of the broken oil pipe in step 1 and scraping off the dirt on the outer wall of the broken oil pipe near the fracture includes the following steps: Step A: Connect the tubing external scraper to the lower end of the drill pipe, and then slowly lower the tubing external scraper to the broken tubing at the bottom of the well; Step B: The drill pipe drives the outer cylinder B, the tubing fracture trimming mechanism, and the tubing external wall scraper to rotate slowly relative to the fractured tubing. The tubing external wall scraper is then slowly pressed down to guide the upper end of the fractured tubing into the outer cylinder B. The tubing external wall scraper is then reciprocally lowered and raised, and the tubing external wall scraper gradually scrapes away dirt on the tubing outer wall near the fracture. Step C: Keep the fracture of the broken oil pipe in contact with the oil pipe fracture trimming mechanism, and keep the oil pipe fracture trimming mechanism rotating and moving downward relative to the broken oil pipe under the drive of the drill pipe following the outer cylinder B, so as to trim the oil pipe fracture.

[0011] The oil pipe connector includes an outer cylinder and slips. The outer cylinder is provided with a reversing mechanism, a slip sleeve, a high-pressure sealing mechanism, a stroke adjustment mechanism and a low-pressure sealing mechanism from top to bottom. The slip sleeve is connected to the outer cylinder by a plurality of shear nails. A backstop mechanism is provided in the outer cylinder, and the backstop mechanism is sleeved on the slip sleeve. The slip is located in the outer cylinder, the upper end of the slip is connected to the lower end of the reversing mechanism, and the slip is located on the upper side of the slip sleeve.

[0012] The outer cylinder body includes an upper joint, 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 joint 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, and the upper end of the positive rotation guide shoe is connected to the lower end of the low-pressure sealing section outer cylinder.

[0013] The reversing mechanism includes a buffer assembly, a reversing cylinder and a plurality of 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. The plurality of guide pins are arranged on the outer cylinder body, and one end of the guide pin extends into the reversing guide groove. The buffer assembly includes an outer centralizing cylinder, an inner centralizing cylinder and a spring. The upper end of the outer centralizing cylinder is fixedly connected to the outer cylinder body. The upper end of the inner centralizing cylinder is inserted into the outer centralizing cylinder and is slidably connected to the outer centralizing cylinder. The lower end of the inner centralizing cylinder is connected to the upper end of the reversing cylinder. The spring is sleeved on the outer centralizing cylinder and the inner centralizing cylinder, and one end of the spring is connected to the upper end of the outer centralizing cylinder and the other end is connected to the lower end of the inner centralizing cylinder. The reversing guide groove comprises an annular groove arranged along the circumference of the reversing cylinder, wherein a plurality of upper long grooves and a plurality of upper short grooves are alternately provided on the upper side of the annular groove, and an upper guide inclined surface is provided between the upper long grooves and the upper short grooves, and a plurality of lower short grooves are alternately provided on the lower side of the annular groove, and a lower guide inclined surface is provided between two adjacent lower short grooves; The upper long groove, the upper short groove and the lower short groove are all arranged along the axial direction of the reversing cylinder, and the lower short groove and the upper long groove and the upper short groove are staggered in the circumferential direction of the reversing cylinder.

[0014] The lower part of the outer wall of the slip is conical, the inner wall of the lower part of the slip is provided with latching teeth, and the lower part of the slip is provided with a plurality of notches evenly distributed in the circumferential direction; 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 an upper clamping tooth, and the lower end surface of the slip sleeve abuts against the upper end surface of the high-pressure sealing mechanism; The backstop mechanism includes a back-locking nut and a C-type backstop ring. The back-locking nut is provided with an external thread that is threadedly connected to the outer cylinder. The C-type backstop ring is movably sleeved on the slip sleeve. One end of the C-type backstop ring is axially limited by the back-locking nut, and the other end is axially limited by the step surface B in the outer cylinder. The inner wall of the C-type backstop ring is provided with a lower locking tooth. The stroke adjustment mechanism includes an adjusting sleeve and a limiting ring. The adjusting sleeve is provided with an external thread which is threadedly connected to the outer cylinder, and the upper end surface of the adjusting sleeve is against the lower end surface of the high-pressure sealing mechanism. An annular groove is opened on the outer wall of the adjusting sleeve along the circumferential direction, and the limiting ring is installed in the annular groove on the adjusting sleeve.

[0015] The high-pressure sealing mechanism includes a packing sleeve A, a support ring, a high-pressure sealing rubber tube, a support ring and a packing sleeve A arranged in sequence from top to bottom. An installation groove A is opened on the inner wall of the packing sleeve A along the circumferential direction, and a packing assembly is arranged in the installation groove A; The low-pressure sealing mechanism includes a packing sleeve B, a plurality of mounting grooves B are circumferentially formed in the packing sleeve B, and a packing assembly is arranged in the mounting groove B; The packing assembly includes two packing gaskets and a plurality of V-shaped sealing packings. All the V-shaped sealing packings are located between the two packing gaskets, and the V-shaped openings of the V-shaped sealing packings face upwards.

[0016] The method for connecting a broken oil pipe with a new oil pipe by using an oil pipe patching device to complete the oil pipe patching work includes the following steps: Step a: Slowly rotate and lower the oil pipe connector to introduce the upper end of the broken oil pipe into the outer cylinder. Then continue to lower the oil pipe connector so that the upper end of the broken oil pipe passes through the low-pressure sealing mechanism, stroke adjustment mechanism, high-pressure sealing mechanism, slip sleeve and slips from bottom to top, and is inserted into the reversing mechanism. Step b: The broken oil pipe is lifted up by the oil pipe patching device. At this time, the low-pressure sealing mechanism contacts the outer wall of the broken oil pipe and forms a low-pressure seal on the outer wall of the broken oil pipe. At the same time, the slips grasp the broken oil pipe, and the lower end of the slips begins to enter the slip sleeve; Step c, continue to lift the broken oil pipe through the oil pipe patching device, the slips and the slip sleeve are wedged tightly, and the slips hold the broken oil pipe tightly, the shear force borne by the shear nails gradually increases and is finally sheared off, the slips, the slip sleeve and the broken oil pipe move downward relative to the outer cylinder to squeeze the high-pressure sealing mechanism, thereby deforming the high-pressure sealing mechanism to form a high-pressure seal on the gap between the outer cylinder and the broken oil pipe, and at the same time, the back-stop mechanism clamps 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 compressed and deformed state, so as to continuously perform high-pressure sealing on the gap between the outer cylinder and the broken oil pipe, and realize connecting the new oil pipe with the broken oil pipe through the oil pipe patching device; Step d: When it is necessary to release the broken oil pipe, slowly press down the oil pipe patching connector. The slips are pushed up to the top of the slip sleeve by the broken oil pipe and are kept separated from the slip sleeve by the reversing mechanism. Then, rotate the oil pipe patching connector to make the anti-retraction mechanism push the slip sleeve upward. 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, lift the oil pipe patching connector to separate the oil pipe patching connector from the broken oil pipe.

[0017] The beneficial effects of the present invention are: 1. First, the broken end of the broken oil pipe is repaired by using an external scraper on the oil pipe, and the dirt on the outer wall of the broken oil pipe near the fracture is scraped off. Then, the broken oil pipe is connected to a new oil pipe using an oil pipe patching device, so that the oil pipe can quickly resume its function as an oil transportation channel. The oil pipe patching work is completed. The oil pipe patching saves time and effort, is highly efficient, and effectively utilizes the broken oil pipe that fell into the well at a low cost.

[0018] 2. When the high-pressure sealing mechanism deforms to form a high-pressure seal on the gap between the outer cylinder and the broken oil pipe, the anti-retraction mechanism clamps 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 compressed and deformed state, so as to continuously perform high-pressure sealing on the gap between the outer cylinder and the broken oil pipe, significantly improving the high-pressure sealing reliability of the oil pipe connector.

[0019] 3. When it is necessary to release 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 keep away from the slip sleeve under the action of the reversing mechanism. Then rotate the oil pipe connector to make the anti-retraction 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.

[0020] 4. First, use the oil pipe external scraper to scrape off the dirt on the outer wall of the broken oil pipe near the fracture, and then connect the broken oil pipe with the new oil pipe through the oil pipe patching, which basically eliminates the influence of the dirt and enables the high-pressure sealing mechanism and the low-pressure sealing mechanism to achieve reliable sealing on the outer wall of the broken oil pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the oil pipe external scraper of the present invention; Figure 2 Schematic diagram of the structure of the oil pipe connector of the present invention; Figure 3 for Figure 2 A local enlarged view at point A; Figure 4 for Figure 2 A partial enlarged view at point B; Figure 5 It is a structural schematic diagram of the reversing cylinder of the present invention; Figure 6 It is an expanded view of the reversing guide groove of the present invention; Figure 7 This is a schematic structural diagram of the slips of the present invention; Figure 8 A half-section view of a C-type stop ring of the present invention; Figure 9 It is a schematic diagram of the main structure of the C-type stop ring of the present invention.

[0022] In the figure: 1-upper joint, 2-spring, 3-outer stabilizing cylinder, 4-inner stabilizing 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 inclined surface, 614-lower short groove, 615-lower guide inclined surface, 7-guide nail, 8-connecting cylinder, 9-slip, 90-notch, 91-grip, 10-slip sleeve, 100-upper gripping tooth, 11-back nut, 12-C-type stop ring, 120-lower gripping tooth, 13-shear nail, 14-high pressure sealing section outer cylinder, 15-packing sleeve A, 16-V-type sealing packing, 17- Packing washer, 18-high-pressure sealing rubber tube, 19-support ring, 20-adjusting sleeve, 21-limiting ring, 22-low-pressure sealing section outer tube, 23-packing sleeve B, 24-positive rotation guide shoe, 25-upper joint B, 26-connecting tube B, 27-oil pipe fracture repair mechanism, 271-spring B, 272-grinding shoe body, 2720-liquid hole, 273-hard alloy layer, 274-centering guide rod, 2740-chamfer, 28-retaining ring, 29-extension tube, 30-scraping tube, 300-T-shaped sliding hole, 31-oil pipe outer scraper mechanism, 311-pressure plate, 312-T-shaped scraper, 313-compression spring, 314-screw, 32-guide shoe. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] like Figures 1 to 9 As shown, the oil pipe patching method of the present invention includes the following steps: Step 1: Identify the location of the broken oil pipe that has fallen to the bottom of the well, lower the oil pipe external scraper into the well, and then use the oil pipe external scraper to trim the fracture of the broken oil pipe and scrape off the dirt on the outer wall of the broken oil pipe near the fracture; Step 2: Remove the tubing scraper from the well, connect the new tubing to the lower end of the drill pipe, and connect the tubing patching device to the lower end of the new tubing. Then, lower the tubing patching device into the well. Next, use the tubing patching device to connect the broken tubing to the new tubing, completing the tubing patching work. First, use the tubing scraper to trim the broken tubing end and scrape off the dirt on the outer wall of the broken tubing near the end. Then, use the tubing patching device to connect the broken tubing to the new tubing, so that the tubing can quickly resume its function as an oil transportation channel, completing the tubing patching work. Tubing patching saves time and effort, is highly efficient, effectively utilizes the broken tubing that has fallen into the well, and is low-cost.

[0025] The oil pipe external scraper includes an outer cylinder B, an oil pipe fracture trimming mechanism 27 and several oil pipe external scraping mechanisms 31. The oil pipe fracture trimming mechanism 27 is arranged in the outer cylinder B. Several of the oil pipe external scraping mechanisms 31 are arranged on the cylinder wall of the outer cylinder B and partially extend into the outer cylinder B. Several of the oil pipe external scraping mechanisms 31 are located on the same side of the oil pipe fracture trimming mechanism 27.

[0026] The outer cylinder B includes an upper joint B25, an extension cylinder 29 and a guide shoe 32. One end of the extension cylinder 29 is connected to one end of the upper joint B25 via a connecting cylinder B26. One end of the guide shoe 32 is connected to the end of the extension cylinder 29 away from the connecting cylinder B26 via a scraping cylinder 30. The extension tube 29 is fitted with a retaining ring 28, which is radially limited by the extension tube 29 and axially limited by the end face of a connecting tube B26 and a stepped surface on the inner wall of the extension tube 29. The connecting tube B26 is threadedly connected to the upper connector B25 and the extension tube 29. The scraping tube 30 is threadedly connected to the extension tube 29 and the guide shoe 32. The retaining ring 28 and the upper connector B25 limit the grinding shoe body 272 in the axial direction of the outer cylinder, ensuring that the grinding shoe body 272 can only move between the retaining ring 28 and the upper connector B25.

[0027] The oil pipe fracture repair mechanism 27 comprises a grinding shoe 272 and a spring B271. The grinding shoe 272 is located within the connecting tube B26 and spline-connected to the connecting tube B26. A hard alloy layer 273 is provided on one end surface of the grinding shoe 272. One end of the spring B271 is connected to the upper connector B25, and the other end is connected to the end of the grinding shoe 272 away from the hard alloy layer 273. After the grinding shoe 272 is spline-connected to the connecting tube B26, it can move axially relative to the connecting tube B26. The hard alloy layer 273 is used to grind the oil pipe fracture to achieve the purpose of repairing the oil pipe fracture. The grinding shoe 272 forms a flexible connection with the upper connector B25 via the spring B271, ensuring that the grinding shoe 272 maintains contact with the oil pipe fracture during repair without significantly damaging the fracture.

[0028] The mill shoe body 272 is provided with a plurality of liquid holes 2720 along the axial direction. The plurality of liquid holes 2720 connect the inner spaces of the outer cylinders on both sides of the mill shoe body 32, so that liquid can be passed into the outer cylinder to flush the outer wall of the broken oil pipe during the process of scraping dirt on the outer wall of the broken oil pipe.

[0029] A straightening guide rod 274 is coaxially connected to the end of the mill shoe body 272 away from the spring B271. The straightening guide rod 274 is circumferentially chamfered 2740 at the end away from the mill shoe body 272. While the oil pipe fracture repair mechanism 27 is repairing the fractured oil pipe, the straightening guide rod 274 guides and straightens the upper end of the fractured oil pipe.

[0030] Two oil pipe external scraping mechanisms 31 are provided on the wall of the scraping cylinder 30, and the external scraping components of the two oil pipe external scraping mechanisms 31 are staggered in the circumferential direction of the scraping cylinder 30. Installing two oil pipe external scraping mechanisms 31 on the wall of the scraping cylinder 30 and staggering the external scraping components of the two oil pipe external scraping mechanisms 31 in the circumferential direction of the scraping cylinder 30 can improve the efficiency of the oil pipe external scraper in scraping dirt from the outer wall of a broken oil pipe.

[0031] The oil pipe external scraping mechanism 31 includes a plurality of external scraping components uniformly arranged on the wall of the scraping cylinder 30; The outer wall of the scraping cylinder 30 is provided with a pressure plate mounting groove at a position corresponding to the outer scraping wall assembly, and a T-shaped sliding hole 300 is opened at the bottom of the pressure plate mounting groove to communicate with the interior of the scraping cylinder 30; The outer scraper wall assembly includes a pressure plate 311 and a T-shaped scraper 312. The pressure plate 311 is located in the pressure plate mounting groove and is connected to the scraping cylinder 30 through multiple screws 314. The T-shaped scraper 312 is slidingly connected to the T-shaped sliding hole 300 and is connected to the pressure plate 311 through multiple compression springs 313. The T-shaped scraper 312 partially extends into the scraping cylinder 30 under the spring force of the compression spring 313.

[0032] The method of using the oil pipe external scraper to trim the fracture of the broken oil pipe in step 1 and scraping off the dirt on the outer wall of the broken oil pipe near the fracture includes the following steps: Step A: Connect the tubing external scraper to the lower end of the drill pipe, and then slowly lower the tubing external scraper to the broken tubing at the bottom of the well; Step B: The drill pipe drives the outer cylinder B, the tubing fracture trimming mechanism 27, and the tubing outer wall scraper 31 to rotate slowly relative to the fractured tubing. The tubing outer wall scraper is then slowly pressed down to guide the upper end of the fractured tubing into the outer cylinder B. The tubing outer wall scraper is then reciprocally lowered and raised, and the tubing outer wall scraper 31 gradually scrapes away dirt on the tubing outer wall near the fracture. Step C: Keep the fracture of the broken oil pipe in contact with the oil pipe fracture trimming mechanism 27, and keep the oil pipe fracture trimming mechanism 27 rotating and moving downward relative to the broken oil pipe under the drive of the drill pipe to trim the oil pipe fracture.

[0033] The working principle or usage process of the oil pipe external scraper is as follows: The outer scraper of the oil pipe is slowly lowered to the broken oil pipe at the bottom of the well, and then the outer cylinder B, the oil pipe fracture trimming mechanism 27 and the outer scraper mechanism 31 of the oil pipe are driven by the drill pipe to keep slowly rotating relative to the broken oil pipe. Next, the outer scraper of the oil pipe is slowly pressed down, and the upper end of the broken oil pipe is introduced into the outer cylinder B by using the guide shoe 32. Then, the T-shaped scraper 312 continues to keep in contact with the outer wall of the broken oil pipe under the spring force of the compression spring 313 to scrape off the dirt on the outer wall of the oil pipe near the fracture. When the outer scraper of the oil pipe is lowered to a certain depth, it is slowly lifted up to a certain height, so that in the process of reciprocating lowering and lifting of the outer scraper of the oil pipe, all dirt on the outer wall of the oil pipe near the fracture is gradually scraped off by the T-shaped scraper 72.

[0034] When the carbide layer 273 maintains contact with the fracture on the oil pipe under the spring force of spring B271, the oil pipe fracture trimming mechanism 27 follows the outer cylinder body and rotates relative to the broken oil pipe under the driving of external force, and uses the carbide layer 273 to grind the oil pipe fracture, thereby achieving the purpose of trimming the oil pipe fracture.

[0035] The oil pipe connector includes an outer cylinder and slips 9. The outer cylinder is provided with a reversing mechanism, a slip sleeve 10, a high-pressure sealing mechanism, a stroke adjustment mechanism and a low-pressure sealing mechanism from top to bottom. The slip sleeve 10 is connected to the outer cylinder by a plurality of shear nails 13. A backstop mechanism is provided in the outer cylinder, and the backstop mechanism is sleeved on the slip sleeve 10. The slips 9 are located in the outer cylinder, the upper end of the slips 9 is connected to the lower end of the reversing mechanism, and the slips 9 are located on the upper side of the slip sleeve 10.

[0036] The outer cylinder body includes an upper joint 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 joint 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, and 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 joint 1, the guide outer cylinder 5, the connecting cylinder 8, the high-pressure sealing section outer cylinder 14, the low-pressure sealing section outer cylinder 22, and the positive rotation guide shoe 24 are threadedly connected.

[0037] 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 arranged on the outer cylinder body, and one end of the guide pin 7 extends into the reversing guide groove 61.

[0038] The buffer assembly includes an outer stabilizing cylinder 3, an inner stabilizing cylinder 4, and a spring 2. The upper end of the outer stabilizing cylinder 3 is fixedly connected to the outer cylinder body. The upper end of the inner stabilizing cylinder 4 is inserted into the outer stabilizing cylinder 3 and slidably connected thereto. The lower end of the inner stabilizing cylinder 4 is connected to the upper end of the reversing cylinder 6. The spring 2 is sleeved onto the outer stabilizing cylinder 3 and the inner stabilizing cylinder 4, with one end of the spring 2 connected to the upper end of the outer stabilizing cylinder 3 and the other end connected to the lower end of the inner stabilizing cylinder 4. The buffer assembly has two functions: first, in the initial state, the spring 2 maintains the slip 9 in a fixed position via the inner stabilizing cylinder 4 and the reversing cylinder 6; second, after the oil pipe patching connector is lowered until the oil pipe limit step 60 contacts the upper end surface of the broken oil pipe, the spring 2 is gradually compressed as the oil pipe patching connector continues to be lowered, providing a buffering and protective effect on the upper end of the broken oil pipe.

[0039] The reversing guide groove 61 includes an annular groove 610 arranged along the circumference of the reversing cylinder 6. A plurality of upper long grooves 611 and a plurality of upper short grooves 612 are alternately formed on the upper side of the annular groove 610, and an upper guide slope 613 is provided between the upper long grooves 611 and the upper short grooves 612. A plurality of lower short grooves 614 are alternately formed on the lower side of the annular groove 610, and a lower guide slope 615 is provided between two adjacent lower short grooves 614. The upper long groove 611 , the upper short groove 612 and the lower short groove 614 are all arranged along the axial direction of the reversing cylinder 6 , and the lower short groove 614 is staggered with the upper long groove 611 and the upper short groove 612 in the circumferential direction of the reversing cylinder 6 .

[0040] The lower portion of the outer wall of the slip 9 is tapered, and a latching tooth 91 is provided on the inner wall of the lower portion of the slip 9. The lower portion of the slip 9 is also provided with a plurality of notches 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 surface of the slip sleeve 10 abuts against the upper end surface of the high-pressure sealing mechanism.

[0041] The anti-recoil mechanism includes a back-locking nut 11 and a C-type anti-recoil ring 12. The back-locking nut 11 is provided with an external thread that is threadedly connected to the outer cylinder. The C-type anti-recoil ring 12 is movably sleeved on the slip sleeve 10. One end of the C-type anti-recoil ring 12 is axially limited by the back-locking nut 11, and the other end is axially limited by the step surface B inside the outer cylinder. The inner wall of the C-type anti-recoil ring 12 is provided with a lower locking tooth 120. When in use, the locking tooth 120 is a unidirectional serration, and the upper locking tooth 100 is a spiral serration.

[0042] 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 threadedly connected to the outer cylinder, and 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 circumferentially formed on the outer wall of the adjustment sleeve 20, and the limiting ring 21 is installed in the annular groove on the adjustment sleeve 20. The adjustment 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 low-pressure sealing section outer cylinder 22. The limiting ring 21 is used to withstand the pressure transmitted by the adjustment sleeve 20 and has a protective effect on the external thread on the adjustment sleeve 20 and the internal thread on the low-pressure sealing section outer cylinder 22.

[0043] The high-pressure sealing mechanism includes a packing sleeve A15, a support ring 19, a high-pressure sealing rubber tube 18, a support ring 19 and a packing sleeve A15 arranged in sequence from top to bottom. A mounting groove A is opened on the inner wall of the packing sleeve A15 along the circumferential direction, and a packing assembly is arranged in the mounting groove A. The low-pressure sealing mechanism includes a packing sleeve B23 with multiple mounting grooves B defined along its circumference. Packing assemblies are located within the mounting grooves B. The high-pressure sealing rubber sleeve 18 is made of fluorine rubber or nitrile rubber with a hardness of A75±5. It operates at a sealing pressure of 50 MPa and can withstand an ambient temperature range of -20°C to 200°C.

[0044] The packing assembly includes two packing washers 17 and a plurality of V-shaped sealing packings 16. All V-shaped sealing packings 16 are located between the two packing washers 17, with the V-shaped openings of the V-shaped sealing packings 16 facing upward. When the tubing patching device is lowered, the upper end of the broken tubing enters the outer cylinder under the guidance of the positive-rotating guide shoe 24. The inner edge of the V-shaped sealing packing 16 contacts the outer wall of the broken tubing. When the tubing patching device is slowly lifted, the broken tubing moves downward a certain distance relative to the outer cylinder. During this process, the inner edge of the V-shaped sealing packing 16 opens inward under the friction force exerted by the broken tubing, thereby increasing the friction 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.

[0045] The method for connecting a broken oil pipe with a new oil pipe by using an oil pipe patching device to complete the oil pipe patching work includes the following steps: Step a: Slowly rotate and lower the oil pipe patching device to introduce the upper end of the broken oil pipe into the outer cylinder. Next, continue to lower the oil pipe patching device so that the upper end of the broken oil pipe 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. Step b: The broken oil pipe is lifted by the oil pipe patching device. At this time, the low-pressure sealing mechanism contacts the outer wall of the broken oil pipe and forms a low-pressure seal on the outer wall of the broken oil pipe. At the same time, the slips 9 grasp the broken oil pipe, and the lower end of the slips 9 begins to enter the slip sleeve 10. Step c, continue to lift the broken oil pipe through the oil pipe patching device, the slips 9 and the slip sleeve 10 are wedged tightly, and the slips 9 hold the broken oil pipe tightly, the shear force borne by the shear nails 13 gradually increases and is finally cut off, and the slips 9, the slip sleeve 10 and the broken oil pipe move downward relative to the outer cylinder to squeeze the high-pressure sealing mechanism, so that the high-pressure sealing mechanism is deformed to form a high-pressure seal on the gap between the outer cylinder and the broken oil pipe. At the same time, the back-stop mechanism clamps the slip sleeve 10 to prevent the slip sleeve 10 from moving upward relative to the outer cylinder, so that the high-pressure sealing mechanism remains in a compressed and deformed state, so as to continuously perform high-pressure sealing on the gap between the outer cylinder and the broken oil pipe, and realize the connection between the new oil pipe and the broken oil pipe through the oil pipe patching device; Step d: When it is necessary to untie the broken oil pipe, slowly press down the oil pipe patching device. The slips 9 are pushed up to the top of the slip sleeve 10 by the broken oil pipe and are kept separated from the slip sleeve 10 by the action of the reversing mechanism. Then, the oil pipe patching device is rotated to make the anti-retraction mechanism push the slip sleeve 10 upward. 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, the oil pipe patching device is lifted to separate the oil pipe patching device from the broken oil pipe.

[0046] The working principle or usage process of the oil pipe connector is as follows: In the initial state, under the action of the spring force of the spring 2, the guide pin 7 is stuck in the upper short groove (i.e. Figure 6 0# slot).

[0047] 2, and then the guide pin 7 is pressed against the guide pin 11 and pressed against the guide pin 12. Then the guide pin 7 is pressed against the guide pin 13 and pressed against the guide pin 14. Then the guide pin 7 is pressed against the guide pin 13 and pressed against the guide pin 14. Then the guide pin 7 is pressed against the guide pin 13 and pressed against the guide pin 14. Figure 6 2# slot as shown).

[0048] Next, the oil pipe patching device lifts the broken oil pipe, the slip 9 grabs the broken oil pipe, and the lower end of the slip 9 begins to enter the slip sleeve 10, and the guide nail 7 begins to enter the upper long groove 611 (i.e. Figure 6 In the 3# groove shown, the inner edge of the V-shaped sealing packing 16 in the low-pressure sealing mechanism expands inward due to the friction exerted by the broken oil pipe, thereby increasing the friction between the V-shaped sealing packing 16 and the broken oil pipe, and achieving a reliable low-pressure seal against 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 against the outer wall of the broken oil pipe. V-shaped sealing packing 16 is made of fluororubber, the standard grade of which is FKM, with a temperature resistance of -20°C to 200°C.

[0049] The broken oil pipe is then lifted upwards by the oil pipe patching device. The slips 9 and the slip sleeve 10 are wedged together, and the slips 9 hold the broken oil pipe tightly. The shear force on the shear pins 13 gradually increases and is eventually sheared off. The slips 9, slip sleeve 10, and the broken oil pipe move downwards relative to the outer cylinder body, squeezing the high-pressure sealing rubber sleeve 18 in the high-pressure sealing mechanism. This causes the high-pressure sealing rubber sleeve 18 to deform and form a high-pressure seal between the outer cylinder body and the broken oil pipe. At the same time, the upper retaining teeth 100 on the slip sleeve 10 engage with the lower retaining teeth 120 on the C-type stop ring 12, preventing the slip sleeve 10 from moving upwards relative to the outer cylinder body. This keeps the high-pressure sealing rubber sleeve 18 in a compressed and deformed state, and continuously provides a high-pressure seal between the outer cylinder body and the broken oil pipe, significantly improving the high-pressure sealing reliability of the oil pipe patching device. At this point, the new oil pipe has been connected to the broken oil pipe through the oil pipe patching device, allowing the oil pipe to quickly resume its function as an oil transportation channel, and the oil pipe patching work is completed.

[0050] When it is necessary to untie the broken oil pipe, the oil pipe connector is slowly lowered, and the slip 9 is pushed up to the top of the slip sleeve 10 by the broken oil pipe, and the guide pin 7 enters the lower short groove 614 (i.e. Figure 6 4# slot), the slips 9 are separated from the broken oil pipe, and then the oil pipe patching device is slowly lifted up, and the guide pin 7 enters the upper short slot 612 (i.e. Figure 6 0# groove as shown), so that the slips 9 and the slip sleeve 10 remain separated; then, the tubing patching device is rotated. Under the action of the one-way serrations on the C-type stop ring 12 and the spiral serrations on the slip sleeve 10, the slip sleeve 10 is pushed upward for a distance. The pressure on the high-pressure sealing rubber cylinder 18 gradually decreases, and it gradually returns to its original state and no longer squeezes the outer wall of the broken tubing. Then, only a small force is needed to lift the tubing patching device to separate it from the broken tubing.

Claims

1. A method for patching an oil pipe, characterized by: The following steps are involved: Step 1: Identify the location of the broken oil pipe that has fallen to the bottom of the well, lower the oil pipe external scraper into the well, and then use the oil pipe external scraper to trim the fracture of the broken oil pipe and scrape off the dirt on the outer wall of the broken oil pipe near the fracture; Step 2: Remove the tubing scraper from the well, 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 lower the tubing connector into the well. Next, use the tubing connector to connect the broken tubing to the new tubing to complete the tubing patching work.

2. The oil pipe patching method according to claim 1, wherein: The oil pipe outer scraper comprises an outer cylinder B, an oil pipe fracture trimming mechanism (27), and a plurality of oil pipe outer scraping mechanisms (31). The oil pipe fracture trimming mechanism (27) is arranged in the outer cylinder B. The plurality of oil pipe outer scraping mechanisms (31) are all arranged on the cylinder wall of the outer cylinder B and partially extend into the outer cylinder B. The plurality of oil pipe outer scraping mechanisms (31) are all located on the same side of the oil pipe fracture trimming mechanism (27).

3. The oil pipe patching method according to claim 2, wherein: The outer cylinder B comprises an upper joint B (25), an extension cylinder (29) and a guide shoe (32), one end of the extension cylinder (29) is connected to one end of the upper joint B (25) via a connecting cylinder B (26), and one end of the guide shoe (32) is connected to one end of the extension cylinder (29) away from the connecting cylinder B (26) via a scraping cylinder (30); A retaining ring (28) is provided in the extension tube (29). The retaining ring (28) is limited in radial direction by the extension tube (29) and in axial direction by an end surface of the connecting tube B (26) and a step surface on the inner wall of the extension tube (29).

4. The oil pipe patching method according to claim 3, wherein: The oil pipe fracture repair mechanism (27) includes a grinding shoe body (272) and a spring B (271). The grinding shoe body (272) is located in the connecting tube B (26) and is spline-connected to the connecting tube B (26). A hard alloy layer (273) is provided on one end surface of the grinding shoe body (272). One end of the spring B (271) is connected to the upper connector B (25), and the other end is connected to an end of the grinding shoe body (272) away from the hard alloy layer (273). The grinding shoe body (272) is provided with a plurality of liquid holes (2720) along the axial direction; One end of the grinding shoe body (272) away from the spring B (271) is coaxially connected to a centering guide rod (274), and one end of the centering guide rod (274) away from the grinding shoe body (272) is provided with a chamfer (2740) along the circumferential direction.

5. The oil pipe patching method according to claim 3, wherein: Two oil pipe outer scraping mechanisms (31) are provided on the wall of the scraping cylinder (30), and the outer scraping components in the two oil pipe outer scraping mechanisms (31) are staggered in the circumferential direction of the scraping cylinder (30); The oil pipe external scraping mechanism (31) comprises a plurality of external scraping components uniformly arranged on the wall of the scraping cylinder (30); A pressure plate mounting groove is provided on the outer wall of the scraping cylinder (30) at a position corresponding to the outer scraping wall assembly, and a T-shaped sliding hole (300) is provided at the bottom of the pressure plate mounting groove and is communicated with the interior of the scraping cylinder (30); The outer scraper assembly comprises a pressing plate (311) and a T-shaped scraper (312), wherein the pressing plate (311) is located in the pressing plate mounting groove and is connected to the scraper cylinder (30) via a plurality of screws (314), and the T-shaped scraper (312) is slidably connected to the T-shaped sliding hole (300) and is connected to the pressing plate (311) via a plurality of compression springs (313), and the T-shaped scraper (312) partially extends into the scraper cylinder (30) under the action of the spring force of the compression spring (313).

6. The oil pipe patching method according to claim 2, wherein: The method of using the oil pipe external scraper to trim the fracture of the broken oil pipe in step 1 and scraping off the dirt on the outer wall of the broken oil pipe near the fracture includes the following steps: Step A: Connect the tubing external scraper to the lower end of the drill pipe, and then slowly lower the tubing external scraper to the broken tubing at the bottom of the well; Step B: driving the outer cylinder B, the oil pipe fracture trimming mechanism (27), and the oil pipe outer wall scraping mechanism (31) to rotate slowly relative to the fractured oil pipe through the drill pipe, then slowly pressing down the oil pipe outer wall scraper to introduce the upper end of the fractured oil pipe into the outer cylinder B, then reciprocatingly lowering and lifting the oil pipe outer wall scraper to gradually scrape off dirt on the outer wall of the oil pipe near the fracture through the oil pipe outer wall scraping mechanism (31); Step C: The fractured end of the broken oil pipe is kept in contact with the oil pipe fracture trimming mechanism (27), and the oil pipe fracture trimming mechanism (27) is kept rotating and moving downward relative to the broken oil pipe under the drive of the drill pipe following the outer cylinder B, thereby trimming the oil pipe fracture.

7. The oil pipe patching method according to claim 1, wherein: The oil pipe connector comprises an outer cylinder and a slip (9), wherein a reversing mechanism, a slip sleeve (10), a high-pressure sealing mechanism, a stroke adjustment mechanism and a low-pressure sealing mechanism are sequentially arranged in the outer cylinder from top to bottom, the slip sleeve (10) is connected to the outer cylinder through a plurality of shear nails (13), a stop mechanism is arranged in the outer cylinder, and the stop mechanism is sleeved on the slip sleeve (10), the slip (9) is located in 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).

8. The oil pipe patching method according to claim 7, wherein: The outer cylinder body comprises an upper joint (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 joint (1) via 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) via the high-pressure sealing section outer cylinder (14); and 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).

9. The oil pipe patching method according to claim 7, wherein: The reversing mechanism comprises a buffer assembly, a reversing cylinder (6) and a plurality of 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) at a position close to the buffer assembly, the plurality of guide pins (7) are arranged on the outer cylinder body, and one end of the guide pin (7) extends into the reversing guide groove (61); The buffer assembly comprises 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 is 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 sleeved 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); The reversing guide groove (61) comprises an annular groove (610) arranged along the circumference of the reversing cylinder (6); a plurality of upper long grooves (611) and a plurality of upper short grooves (612) are alternately provided on the upper side of the annular groove (610); an upper guide inclined surface (613) is provided between the upper long grooves (611) and the upper short grooves (612); a plurality of lower short grooves (614) are alternately provided on the lower side of the annular groove (610); a lower guide inclined surface (615) is provided between two adjacent lower short grooves (614); The upper long groove (611), the upper short groove (612), and the lower short groove (614) are all arranged along the axial direction of the reversing cylinder (6), and the lower short groove (614) is staggered with the upper long groove (611) and the upper short groove (612) in the circumferential direction of the reversing cylinder (6).

10. The oil pipe patching method according to claim 7, wherein: The lower portion of the outer wall of the slip (9) is conical, a latching tooth (91) is provided on the inner wall of the lower portion of the slip (9), and a plurality of notches (90) are evenly distributed in the circumferential direction on the lower portion of the slip (9); The upper end of the slip sleeve (10) is coaxially provided with a tapered hole, an upper latching tooth (100) is provided on the outer wall of the middle portion of the slip sleeve (10), and the lower end surface of the slip sleeve (10) abuts against the upper end surface of the high-pressure sealing mechanism; The backstop mechanism comprises a back-tightening nut (11) and a C-type backstop ring (12), wherein the back-tightening nut (11) is provided with an external thread connected to the outer cylinder, and the C-type backstop ring (12) is movably sleeved on the slip sleeve (10), and one end of the C-type backstop ring (12) is axially limited by the back-tightening nut (11), and the other end is axially limited by the step surface B in the outer cylinder, and the inner wall of the C-type backstop ring (12) is provided with a lower latching tooth (120); The stroke adjustment mechanism comprises an adjustment sleeve (20) and a limiting ring (21); the adjustment sleeve (20) is provided with an external thread threadedly connected to the outer cylinder, and the upper end surface of the adjustment sleeve (20) abuts against the lower end surface of the high-pressure sealing mechanism; an annular groove is opened on the outer wall of the adjustment sleeve (20) along the circumferential direction, and the limiting ring (21) is installed in the annular groove on the adjustment sleeve (20).

11. The oil pipe patching method according to claim 7, wherein: The high-pressure sealing mechanism comprises a packing sleeve A (15), a support ring (19), a high-pressure sealing rubber tube (18), a support ring (19) and a packing sleeve A (15) arranged in sequence from top to bottom, and an installation groove A is opened on the inner wall of the packing sleeve A (15) along the circumferential direction, and a packing assembly is arranged in the installation groove A; The low-pressure sealing mechanism comprises a packing sleeve B (23), a plurality of mounting grooves B are circumferentially formed in the packing sleeve B (23), and a packing assembly is provided in the mounting groove B; The packing assembly comprises two packing gaskets (17) and a plurality of V-shaped sealing packings (16), wherein all the V-shaped sealing packings (16) are located between the two packing gaskets (17), and the V-shaped openings of the V-shaped sealing packings (16) face upward.

12. The oil pipe patching method according to claim 7, wherein: The method for connecting a broken oil pipe with a new oil pipe by using an oil pipe patching device to complete the oil pipe patching work includes the following steps: Step a, slowly rotating and lowering the oil pipe connector to introduce the upper end of the broken oil pipe into the outer cylinder, then continuing to lower the oil pipe connector so that the upper end of the broken oil pipe passes through the low-pressure sealing mechanism, the stroke adjustment mechanism, the high-pressure sealing mechanism, the slip sleeve (10) and the slip (9) from bottom to top, and is inserted into the reversing mechanism; Step b, lifting the broken oil pipe by the oil pipe patching device, at this time the low-pressure sealing mechanism contacts the outer wall of the broken oil pipe and forms a low-pressure seal on the outer wall of the broken oil pipe, and at the same time the slip (9) grabs the broken oil pipe, and the lower end of the slip (9) begins to enter the slip sleeve (10); Step c, continue to lift the broken oil pipe through the oil pipe connector, the slip (9) and the slip sleeve (10) are wedged tightly, and the slip (9) holds the broken oil pipe tightly, the shear force borne by the shear nail (13) gradually increases and is finally cut off, the slip (9), the slip sleeve (10) and the broken oil pipe move downward relative to the outer cylinder to squeeze the high-pressure sealing mechanism, so that the high-pressure sealing mechanism is deformed to form a high-pressure seal on the gap between the outer cylinder and the broken oil pipe, at the same time, the stop mechanism clamps the slip sleeve (10) to prevent the slip sleeve (10) from moving upward relative to the outer cylinder, so that the high-pressure sealing mechanism remains in a compressed and deformed state, so as to continuously perform high-pressure sealing on the gap between the outer cylinder and the broken oil pipe, and realize the connection between the new oil pipe and the broken oil pipe through the oil pipe connector; Step d: When it is necessary to untie the broken oil pipe, slowly press down the oil pipe connector. The slip (9) moves upward to the top of the slip sleeve (10) under the push of the broken oil pipe and keeps it separated from the slip sleeve (10) under the action of the reversing mechanism. Then, the oil pipe connector is rotated to make the anti-retraction mechanism push the slip sleeve (10) upward. 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, the oil pipe connector is lifted up to separate the oil pipe connector from the broken oil pipe.

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