Anti-explosion PE fully-coated sucker rod

Abstract

The invention belongs to the technical field of sucker rods, and particularly relates to an anti-blasting PE fully-coated sucker rod which comprises a sucker rod body, a PE protective layer wraps the sucker rod body in a surrounding mode, a threaded hole is formed in a locking head, a blasting piece is arranged in the threaded hole, a first vent hole corresponding to the threaded hole is formed in the locking head, and a second vent hole corresponding to the threaded hole is formed in the locking head. A gap between the sucker rod body and the PE protective layer is communicated with the other end of the first vent hole, and a second vent hole is formed in the compression bolt in a penetrating mode. According to the anti-explosion PE fully-coated sucker rod, through the formed threaded hole, pressure gathering and pressure relief treatment can be conveniently conducted on a gap between the PE protective layer and the sucker rod body, the phenomenon that the PE protective layer is exploded due to too large pressure is avoided, a first vent hole, the threaded hole and a second vent hole are matched, when the pressure is too large, a rupture disk is burst, and the rupture disk is damaged. And the first vent hole, the threaded hole and the second vent hole are matched for pressure relief treatment, and the phenomenon that the PE protective layer is exploded and damaged is effectively avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sucker rods, in particular to a PE full-coated sucker rod capable of preventing explosion. BACKGROUND

[0002] The sucker rod (also known as oil rod or pump rod) plays a role in oil production operation, which is to transmit the reciprocating motion provided by the ground equipment to the downhole oil pump, push the oil well to extract and lift the oil, and adjust the yield and pressure. In simple terms, its function is to transmit the up-and-down reciprocating motion of the ground to the downhole pump, make the pump work and pump oil, start and lift the oil in the well, send the oil to the ground, control the pumping rate and yield by adjusting the driving parameters (speed, falling stroke, etc.), and work with the downhole components (pump, valve, cavity, etc.) to ensure the sealing and wear control.

[0003] A PE full-coated sucker rod is disclosed in a Chinese patent with publication number CN222823185U. The PE full-coated sucker rod includes a sucker rod body, a connecting end fixedly installed at both left and right ends of the sucker rod body, a protective sleeve sleeved on the outer side of the sucker rod body, and an end sleeve sleeved on both left and right ends of the sucker rod body. The PE full-coated sucker rod is coated with a protective sleeve made of improved ultrahigh molecular polyethylene material on the outer side of the sucker rod body, which can better adapt to 1800-2000 meters of well section and has better wear resistance. The two ends of the sucker rod body are coated with end sleeves made of engineering plastic alloy material, which can make the sucker rod body have better high-temperature resistance, friction resistance, and corrosion resistance. By setting a limiting ring, an internal thread sleeve, an external thread sleeve, and a circular truncated cone ring sleeve in cooperation, the end sleeve at the end of the sucker rod body is extruded, making the connection between the end sleeve and the end of the sucker rod body more secure.

[0004] The coating layer of the PE full-coated sucker rod is made of ultrahigh molecular weight polyethylene, which has the characteristic of being impermeable to water, but small gas molecules can penetrate. After the sucker rod is lowered into the well, it is immersed in the produced liquid from the oil well. The dissolved methane gas in the produced liquid can slowly penetrate and diffuse into the PE coating layer, accumulating in the small gap space between the coating layer and the metal rod body. When the pressure of methane in the coating layer is equal to the hydraulic pressure in the oil pipe, the PE coating layer is sealed on the outside, and the methane gas can only slowly penetrate out. The gas pressure at the wellhead cannot be released in time, and when it approaches the wellhead, the pressure difference between the inside and outside of the PE coating layer is greater than the yield strength of the PE coating layer, and the gas expansion easily causes the PE coating layer to burst, affecting the service life.

[0005] Therefore, the application provides a PE full-coated sucker rod capable of preventing explosion. SUMMARY

[0006] In order to make up for the deficiency of the prior art, in order to solve the problem that the PE protective layer is damaged due to excessive pressure, the application provides a PE full-coated sucker rod capable of preventing explosion.

[0007] The application solves the technical problem by adopting the technical scheme that the PE full-coated sucker rod capable of preventing explosion comprises a sucker rod body, a PE protective layer is wrapped around the sucker rod body, a locking head is fixedly connected to the top end of the sucker rod body, a threaded hole is arranged in the locking head, an explosion disc is arranged in the threaded hole, a compression bolt is threadedly connected in the threaded hole, a first air hole corresponding to the threaded hole is arranged in the locking head and is communicated with the threaded hole, a gap between the sucker rod body and the PE protective layer is communicated with the other end of the first air hole, and a second air hole is arranged in the compression bolt. A cylinder is inlaid in the locking head, exhaust grooves are symmetrically connected to the cylinder, the other ends of the exhaust grooves extend out of the locking head, a sealing assembly is arranged in the exhaust grooves, exhaust assemblies are arranged in an array on the sucker rod body, an air exhaust mechanism is arranged in the cylinder, and a driving mechanism is arranged at the top of the cylinder.

[0008] By adopting the above scheme, in the oil production operation, the explosion-proof PE full-coated sucker rod mainly transmits the mechanical power set on the ground to the oil well pump in the formation to realize the oil driving, extraction and lifting of the oil well. During use, the PE protective layer is wrapped around the sucker rod body, and the PE protective layer is used for protecting the surface of the sucker rod body. The main component of the gas in the oil well is methane, the PE protective layer is ultra-high molecular weight polyethylene, has the characteristic of water impermeability, but small gas molecules can penetrate, after the sucker rod body is lowered into the well, it is soaked in the produced fluid of the oil well, the small molecule gas of methane dissolved in the produced fluid can slowly penetrate and diffuse into the PE protective layer, and gather in the small gap space between the PE protective layer and the metal rod body of the sucker rod body, until the methane pressure in the PE protective layer is balanced with the hydraulic pressure in the oil pipe. When the rod is lifted, the PE protective layer expands with the decrease of the pressure in the oil pipe, the PE protective layer is sealed outside, the methane gas can only slowly penetrate out and be lifted to the wellhead, the gas pressure cannot be released in time, when it approaches the wellhead, the pressure difference between the inside and outside of the PE protective layer is greater than the yield strength of the PE protective layer, the PE protective layer is blown up by the expansion of the gas. In order to avoid the damage of the PE protective layer, a threaded hole is arranged in the locking head, the first vent hole, the threaded hole and the second vent hole cooperate to make the gathered gas flow to the first vent hole, the gathered gas can be discharged through the threaded hole. The material of the rupture disc can be PE, the rupture disc is used to seal and protect the threaded hole normally, to prevent the produced fluid of the oil well from entering the threaded hole. According to the required burst pressure, the thickness is set, when the gap between the PE protective layer and the sucker rod body gathers too much pressure during the lifting operation, the rupture disc will be broken, and the pressure relief can be carried out through the cooperation of the first vent hole, the threaded hole and the second vent hole, which can effectively avoid the damage of the PE protective layer. After the sucker rod body is taken out, only the compression bolt needs to be taken out and a new rupture disc needs to be replaced.

[0009] Preferably, the exhaust assembly comprises an air inlet head, a flow pipe and a pipeline, the air inlet head is arranged in an array on the sucker rod body, the flow pipe corresponding to the air inlet head is arranged inside the sucker rod body, one end of the flow pipe is in communication with the air inlet head, the pipeline is embedded in the sucker rod body, the other end of the flow pipe is in communication with the pipeline, and the bottom of the cylinder is connected with a connecting head in communication with the cylinder.

[0010] By adopting the above scheme, the gas pressure gathered in the gap between the PE protective layer and the sucker rod body flows into the pipeline through the cooperation of the air inlet head and the flow pipe, the air inlet head is arranged in an array, which can comprehensively discharge and relieve the gathered pressure. Through the cooperation of the pipeline and the connecting head, the gas flows into the cylinder, drives the sealing assembly to move, and no longer seals the exhaust groove. The exhaust groove can be used for pressure relief, which can effectively avoid the damage of the PE protective layer caused by the excessive pressure of the gathered gas.

[0011] Preferably, the sealing assembly comprises a sealing block, a baffle and a reset assembly, the sealing block is engagedly arranged inside the exhaust groove, the baffle is fixedly connected with the side surface of the sealing block, the reset assembly for resetting the sealing block is arranged on the exhaust groove, and a sealing ring is arranged around the sealing block.

[0012] By adopting the above scheme, the sealing block and the sealing ring cooperate to seal the inside of the exhaust groove. After the gas flows into the cylinder through the pipeline and the connecting head, the gas flows into the exhaust groove, thereby pushing the sealing block to move out of the inside of the exhaust groove, so that the exhaust groove is no longer sealed. When the pressure relief is completed, the reset assembly resets the sealing block, so that the exhaust groove is resealed and protected.

[0013] Preferably, the sealing block is rectangular, the outer surface of the sealing block is in close contact with the inner wall of the exhaust groove, and the sealing block is used for sealing the exhaust groove.

[0014] By adopting the above scheme, the sealing block and the sealing ring cooperate to seal and protect the inside of the exhaust groove.

[0015] Preferably, the reset assembly comprises a guide groove, a guide plate, a stop block, a square groove and a reset spring, the guide groove is symmetrically arranged on the exhaust groove, the guide plate is arranged inside the guide groove, one end of the guide plate is fixedly connected with the baffle, the stop block is fixedly arranged inside the guide groove, the square groove corresponding to the stop block is arranged inside the guide plate, the stop block is arranged inside the square groove, the reset spring is arranged inside the square groove, one end of the reset spring is fixedly connected with the inner wall of the square groove, and the other end of the reset spring is fixedly connected with the side surface of the stop block.

[0016] By adopting the above scheme, when the excessive gas pressure pushes the sealing block to move, the baffle drives the guide plate to move, the guide groove and the guide plate cooperate to make the baffle move stably, and the movement of the guide plate through the stop block cooperates to compress the reset spring. When the pressure relief is completed, the reset spring is reset, the square groove cooperates to push the guide plate to reset, and the guide plate moves to reset the sealing block through the baffle to seal the exhaust groove.

[0017] Preferably, the locking head is fixedly connected with a threaded head at the top, and the sucker rod body is fixedly connected with a threaded sleeve at the bottom.

[0018] By adopting the above scheme, the threaded head and the threaded sleeve cooperate to splice the sucker rod body.

[0019] Preferably, the air extraction mechanism includes a sliding block, a protective box, a drive motor, a limiting block, a drive rod, and a fan blade. The sliding block is disposed inside the cylinder, the protective box is disposed inside the sliding block, the drive motor is fixedly disposed inside the protective box, the limiting block is fixedly disposed at the bottom of the sliding block, the drive rod is rotatably disposed inside the limiting block, and one end of the drive rod is fixedly connected to the output end of the drive motor. The fan blade is fixedly disposed on the drive rod, and the limiting block is conical in shape.

[0020] By adopting the above scheme, gas enters the cylinder through the connection of pipes and connectors, which pushes the sliding block upward. When the side of the sliding block moves upward and is no longer sealed to the exhaust groove, the exhaust groove can be used for venting and depressurization. When the sliding block moves upward to release pressure, the protective box will seal and protect the drive motor. The drive motor will drive the drive rod to rotate, and the rotation of the drive rod will drive the fan blade to move. The movement of the fan blade will assist the upward flow of air pressure, which can further assist the depressurization process, improve the depressurization efficiency, and effectively prevent the PE protective layer from being damaged. The upward flow of air pressure will flow through the limiting block. The limiting block is conical and can guide the airflow, allowing the gas to flow into the exhaust groove, where it will be depressurized.

[0021] Preferably, a drive plate is fixedly connected to the top of the sliding block. The drive mechanism includes an annular groove, a limiting plate, a conductive cylinder, a first magnetic block, a conductive block, and a power supply component. The annular groove is fixedly disposed on the top of the cylinder, and one end of the drive plate extends into the interior of the annular groove. The limiting plate is disposed inside the annular groove, and the drive plate is fixedly connected to the limiting plate. The conductive cylinder is embedded in the top of the drive plate and is electrically connected to the drive motor. The first magnetic block is fixedly disposed on the top of the inner wall of the annular groove, and the conductive block is fixedly disposed at the bottom of the first magnetic block, with the conductive block located directly above the conductive cylinder. The power supply component is fixedly disposed on the top of the annular groove and is electrically connected to the conductive block. A second magnetic block is fixedly disposed on the drive plate.

[0022] By adopting the above scheme, when the sliding block moves upward, the drive plate will drive the limiting plate and the conductive cylinder to move synchronously. After the conductive block is inserted into the conductive cylinder, the second magnetic block will move to the bottom of the first magnetic block. The magnetic force generated by the two will limit the drive plate, so that the conductive cylinder and the conductive block are stably connected. The cooperation between the conductive block and the conductive cylinder will allow the current inside the power supply component to flow into the drive motor, which will then drive the drive motor to drive the fan blades and assist in the pressure relief process.

[0023] Preferably, a guide shaft is fixedly installed inside the annular groove, a drive spring is arranged around the guide shaft, one end of the drive spring is fixedly connected to the top of the limiting plate, the other end of the drive spring is fixedly connected to the top of the inner wall of the annular groove, and a drive block is fixedly installed on the sliding block.

[0024] By adopting the above scheme, when the drive plate pushes the limit plate to move, the guide shaft will guide and limit the drive plate to move smoothly. After the pressure is released, the drive spring will reset and push the limit plate to reset. When the limit plate resets, it will separate the first magnetic block and the second magnetic block, and at the same time, it will separate the conductive cylinder and the conductive block, which will stop the drive motor from working. At the same time, it will reset the sliding block to seal and protect the top of the connector.

[0025] Preferably, the locking head has a strip groove corresponding to the vent groove embedded inside, a push plate passes through the strip groove, the push plate is located directly above the top of the drive block, a threaded cylinder is fixedly installed inside the push plate, an adjusting screw is rotatably installed inside the threaded cylinder, the adjusting screw is rotatably connected to the strip groove, and a knob is fixedly connected to the top of the adjusting screw.

[0026] By adopting the above scheme, when the sliding block moves, it will drive the drive block to move synchronously. When the sucker rod body is moved to the outside for disassembly, the sliding block does not reset and causes the first and second magnetic blocks to separate. Then, the knob can be turned to drive the adjusting screw to rotate. The adjusting screw and the threaded cylinder will cause the push plate to move. After the push plate moves down and contacts the drive block, it will push the sliding block to reset, thereby allowing the first and second magnetic blocks to separate.

[0027] The beneficial effects of this invention are as follows: 1. The present invention discloses a rupture-proof PE fully-encased sucker rod. The threaded hole facilitates pressure relief of the gap between the PE protective layer and the sucker rod body, effectively preventing the PE protective layer from bursting due to excessive pressure. To prevent damage to the PE protective layer, a threaded hole is provided inside the locking head. The No. 1 vent, threaded hole, and No. 2 vent work together to allow accumulated gas to flow to the No. 1 vent, and the accumulated gas can be discharged through the threaded hole. The rupture disc can be made of PE and is normally used to seal and protect the threaded hole, preventing external oil well produced fluid from entering the threaded hole. The thickness is set according to the required burst pressure. During rod lifting, if the pressure accumulated in the gap between the PE protective layer and the sucker rod body becomes too high, the rupture disc will rupture. Pressure relief can then be achieved through the No. 1 vent, threaded hole, and No. 2 vent, effectively preventing damage to the PE protective layer from bursting. After the sucker rod body is removed, repair only requires removing the clamping bolt and replacing the rupture disc.

[0028] 2. The explosion-proof PE fully-enclosed sucker rod of the present invention can further assist in pressure relief through the set venting groove. When the pressure accumulated in the gap between the PE protective layer and the sucker rod body is too large, and the pressure relief efficiency through the threaded hole alone is not high, the gas will flow into the pipeline through the cooperation of the air inlet head and the flow pipe. The array of air inlets can comprehensively release the accumulated pressure. The gas will flow into the cylinder through the cooperation of the pipe and the connector. The venting groove can perform venting and pressure relief, which improves the pressure relief efficiency and can prevent the PE protective layer from bursting due to excessive pressure.

[0029] 3. The explosion-proof PE fully-enclosed sucker rod of the present invention, through the setting of fan blades and drive motor, can further perform pressure relief treatment, improve pressure relief efficiency, and when the sliding block moves upward, the drive plate will drive the limiting plate and the conductive cylinder to move synchronously. The movement of the conductive cylinder causes the conductive block to be inserted into the conductive cylinder, which will cause the drive motor to work and drive the fan blade to move. When the fan blade moves, it will assist the upward flow of air pressure. The upward flow of air pressure will flow through the limiting block. The limiting block is conical and can guide the airflow, so that the gas flow enters the exhaust groove. The exhaust groove will perform pressure relief treatment, which can quickly relieve pressure and further prevent the PE protective layer from bursting due to excessive pressure, thus improving the service life of the explosion-proof PE fully-enclosed sucker rod.

[0030] 4. The explosion-proof PE fully encapsulated sucker rod of the present invention can also use glue to seal the threaded hole during the use of the sucker rod body. Due to the low strength of the glue and the low burst pressure, the threaded hole needs to be cleaned for on-site repair after the burst. It can be reused. When depressurizing, a rubber plug can also be placed in the threaded hole to seal it. The rubber plug plays a sealing role. On-site, the hole can be re-stuffed with a new rubber plug. The repair is simple and improves the flexibility of the explosion-proof PE fully encapsulated sucker rod. Attached Figure Description

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] Figure 1 This is a perspective view of the explosion-proof PE-covered sucker rod of the present invention; Figure 2 This is a schematic diagram of the structure of the sucker rod body in this invention; Figure 3 This is a schematic diagram of the pipe structure in this invention; Figure 4 This is a schematic diagram of the PE protective layer in this invention; Figure 5 This is a schematic diagram of the locking head in this invention; Figure 6This is a partial structural schematic diagram of the sucker rod body and PE protective layer in this invention; Figure 7 This is the present invention. Figure 6 Enlarged structural diagram of A in the middle; Figure 8 This is a schematic diagram of the exhaust groove structure in this invention; Figure 9 This is a schematic diagram of the sealing block in this invention; Figure 10 This is a schematic diagram of the cylindrical structure in this invention; Figure 11 This is a schematic diagram of the strip groove structure in this invention.

[0033] In the diagram: 1. Sucker rod body; 2. Locking head; 3. Threaded head; 4. Threaded sleeve; 5. PE protective layer; 6. Threaded hole; 7. No. 1 vent; 8. Rupture disc; 9. Clamping bolt; 10. No. 2 vent; 11. Air inlet; 12. Flow pipe; 13. Pipe; 14. Cylinder; 15. Connector; 16. Exhaust groove; 17. Guide groove; 18. Guide plate; 19. Stop block; 20. Square groove; 21. Return spring; 22. Sealing block; 23. Sealing ring; 24. Baffle; 25. Sliding block; 26. Protective box; 27. Drive motor; 28. Limit block; 29. ​​Drive rod; 30. Fan blade; 31. Drive plate; 32. Annular groove; 33. Guide shaft; 34. Limit plate; 35. No. 2 magnetic block; 36. Conductive cylinder; 37. No. 1 magnetic block; 38. Conductive block; 39. Power supply assembly; 40. Strip groove; 41. Push plate; 42. Threaded cylinder; 43. Adjusting screw; 44. Knob; 45. Drive block; 46. Drive spring. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] like Figures 1 to 11 As shown in the embodiment of the present invention, a rupture-proof PE fully enclosed sucker rod includes a sucker rod body 1, a PE protective layer 5 wrapped around the sucker rod body 1, a locking head 2 fixedly connected to the top of the sucker rod body 1, a threaded hole 6 inside the locking head 2, a rupture disc 8 inside the threaded hole 6, a clamping bolt 9 threadedly connected inside the threaded hole 6, a first vent hole 7 corresponding to the threaded hole 6 inside the locking head 2, and the first vent hole 7 is connected to the threaded hole 6, the gap between the sucker rod body 1 and the PE protective layer 5 is connected to the other end of the first vent hole 7, and a second vent hole 10 is provided through the clamping bolt 9. The locking head 2 is embedded with a cylinder 14. The cylinder 14 is symmetrically connected with venting grooves 16, and the locking head 2 extends out from the other end of the venting grooves 16. A sealing component is provided inside the venting grooves 16. Venting components are arranged in an array on the sucker rod body 1. A suction mechanism is provided inside the cylinder 14. A driving mechanism is provided at the top of the cylinder 14. During oil extraction operations, the explosion-proof PE-coated sucker rod primarily transmits the mechanical power set on the surface to the oil well pump in the formation, enabling oil displacement, extraction, and hoisting. During use, the sucker rod body 1 is surrounded by a PE protective layer 5, which protects the surface of the sucker rod body 1. The main gas component in the oil well is methane. The PE protective layer 5, made of ultra-high molecular weight polyethylene, is water-impermeable, but small gas molecules can penetrate. After the sucker rod body 1 is inserted into the well, it is immersed in the produced oil fluid. Small methane molecules dissolved in the liquid can slowly permeate and diffuse into the PE protective layer 5, accumulating in the tiny gaps between the PE protective layer 5 and the metal rod body 1 of the sucker rod. This accumulation continues until the methane pressure inside the PE protective layer 5 equals the hydraulic pressure inside the tubing. In a 1500-meter well section, the pressure of methane permeating into the coating reaches 15 MPa, increasing with depth. During rod lifting operations, the sucker rod body 1 is lifted relatively quickly, causing the methane inside the PE protective layer 5 to expand as the pressure inside the tubing decreases. Since the PE protective layer 5 is sealed to the outside, the methane gas can only slowly permeate out. The gas is hoisted from a depth of 1500 meters to the wellhead in less than an hour. The gas pressure doesn't have time to release, and as it approaches the wellhead, the pressure difference between the inside and outside of the PE protective layer 5 exceeds its yield strength. The gas expansion causes the PE coating to burst. To prevent damage to the PE protective layer 5, a threaded hole 6 is provided inside the locking head 2. The first vent hole 7, threaded hole 6, and second vent hole 10 work together to direct the accumulated gas towards the first vent hole 7. The accumulated gas can be released through the threaded hole 6. The rupture disc 8 can be made of PE. The rupture disc 8 is flat... It is commonly used to seal and protect the threaded hole 6 to prevent external oil well produced fluid from entering the threaded hole 6. The thickness is set according to the required burst pressure. When the rod is lifted during operation, if the pressure accumulated in the gap between the PE protective layer 5 and the sucker rod body 1 is too large, it will rupture the bursting disc 8. Then, the pressure can be relieved through the No. 1 vent 7, the threaded hole 6 and the No. 2 vent 10, which effectively prevents the PE protective layer 5 from bursting and being damaged. After the sucker rod body 1 is removed, the repair only requires removing the clamping bolt 9 and replacing the new bursting disc 8. During the use of the sucker rod body 1, the threaded hole 6 can also be sealed with glue. Due to the low strength and low burst pressure of the glue, the threaded hole 6 needs to be cleaned after the burst. It can be reused. When depressurizing, a rubber plug can be placed in the threaded hole 6 to seal the hole. The rubber plug plays a sealing role. On site, you can simply replace the hole with a new rubber plug. The repair is simple. When the pressure accumulated in the gap between the PE protective layer 5 and the sucker rod body 1 is too high, and the pressure relief efficiency through the threaded hole 6 alone is not high, the excessive pressure can be quickly relieved by the cooperation of the venting assembly, the air extraction mechanism and the venting groove 16. This can further prevent the PE protective layer 5 from bursting due to excessive pressure and improve the service life of the explosion-proof PE fully enclosed sucker rod.

[0036] Furthermore, the exhaust assembly includes an air inlet head 11, a flow pipe 12, and a pipe 13. The air inlet head 11 is arrayed on the sucker rod body 1. The flow pipe 12 corresponding to the air inlet head 11 is disposed inside the sucker rod body 1, and one end of the flow pipe 12 is connected to the air inlet head 11. The pipe 13 is embedded inside the sucker rod body 1, and the other end of the flow pipe 12 is connected to the pipe 13. A connector 15 is connected to the bottom of the cylinder 14, and the connector 15 is connected to the cylinder 14. The gas pressure accumulated in the gap between the PE protective layer 5 and the sucker rod body 1 will flow into the inside of the pipe 13 through the cooperation of the air inlet head 11 and the flow pipe 12. The array of air inlets 11 can comprehensively release and relieve the accumulated pressure. Through the cooperation of the pipe 13 and the connector 15, the gas will flow into the inside of the cylinder 14, driving the sealing component to move and no longer sealing the exhaust groove 16. The exhaust groove 16 can be used for pressure relief, which can effectively prevent the PE protective layer 5 from being damaged due to excessive gas accumulation pressure.

[0037] Furthermore, the sealing assembly includes a sealing block 22, a baffle 24, and a reset assembly. The sealing block 22 is engaged inside the exhaust groove 16, the baffle 24 is fixedly connected to the side of the sealing block 22, and the reset assembly for resetting the sealing block 22 is disposed on the exhaust groove 16. A sealing ring 23 is arranged around the sealing block 22. The sealing block 22 and the sealing ring 23 work together to seal the inside of the exhaust groove 16. After the gas flows into the cylinder 14 through the pipe 13 and the connector 15, the gas will flow into the exhaust groove 16, which will push the sealing block 22 to move. After the sealing block 22 moves out of the exhaust groove 16, it will no longer seal the exhaust groove 16. After the pressure is released, the sealing block 22 will be reset by the reset component, and the exhaust groove 16 can be resealed and protected.

[0038] Furthermore, the sealing block 22 is rectangular, and the outer surface of the sealing block 22 is in contact with the inner wall of the exhaust groove 16. The sealing block 22 is used to seal the exhaust groove 16. The sealing block 22 and the sealing ring 23 cooperate to seal and protect the inside of the exhaust groove 16.

[0039] Furthermore, the reset assembly includes a guide groove 17, a guide plate 18, a stop block 19, a square groove 20, and a reset spring 21. The guide groove 17 is symmetrically arranged on the exhaust groove 16. The guide plate 18 passes through the guide groove 17, and one end of the guide plate 18 is fixedly connected to the stop plate 24. The stop block 19 is fixedly arranged inside the guide groove 17. The square groove 20 corresponding to the stop block 19 is arranged inside the guide plate 18, and the stop block 19 passes through the square groove 20. The reset spring 21 is arranged inside the square groove 20, and one end of the reset spring 21 is attached to the inner wall of the square groove 20. The other end of the return spring 21 is fixedly connected to the side of the stop block 19. When the air pressure is too high and pushes the sealing block 22 to move, the baffle 24 will drive the guide plate 18 to move. Through the cooperation of the guide groove 17 and the guide plate 18, the baffle 24 will move smoothly. At the same time, the movement of the guide plate 18 will compress the return spring 21 through the cooperation of the stop block 19. When the pressure is released, the return spring 21 will reset. Through the cooperation of the square groove 20, the guide plate 18 will be pushed to reset. When the guide plate 18 moves, the baffle 24 will reset the sealing block 22 to seal the exhaust groove 16.

[0040] Furthermore, a threaded head 3 is fixedly connected to the top of the locking head 2, and a threaded sleeve 4 is fixedly connected to the bottom of the sucker rod body 1; The sucker rod body 1 can be spliced ​​by the threaded head 3 and the threaded sleeve 4.

[0041] Furthermore, the air extraction mechanism includes a sliding block 25, a protective box 26, a drive motor 27, a limiting block 28, a drive rod 29, and a fan blade 30. The sliding block 25 is provided inside the cylinder 14, the protective box 26 is provided inside the sliding block 25, the drive motor 27 is fixedly provided inside the protective box 26, the limiting block 28 is fixedly provided at the bottom of the sliding block 25, the drive rod 29 is rotatably provided inside the limiting block 28, and one end of the drive rod 29 is fixedly connected to the output end of the drive motor 27. The fan blade 30 is fixedly provided on the drive rod 29, and the limiting block 28 is conical in shape. Gas enters the cylinder 14 through the connection of pipe 13 and connector 15, pushing the sliding block 25 upward. When the side of the sliding block 25 no longer seals the exhaust groove 16, the exhaust groove 16 can be used for venting and depressurization. When the sliding block 25 moves upward to depressurize, the protective box 26 seals and protects the drive motor 27. The drive motor 27 drives the drive rod 29 to rotate. When the drive rod 29 rotates, it drives the fan blade 30 to move. When the fan blade 30 moves, it assists the upward flow of air pressure, which can further assist the depressurization process, improve the depressurization efficiency, and effectively prevent the PE protective layer 5 from being damaged. The upward flow of air pressure will flow through the limiting block 28. The limiting block 28 is conical and can guide the airflow, allowing the gas to flow into the exhaust groove 16, where it will be depressurized.

[0042] Furthermore, a drive plate 31 is fixedly connected to the top of the sliding block 25. The drive mechanism includes an annular groove 32, a limiting plate 34, a conductive cylinder 36, a first magnetic block 37, a conductive block 38, and a power supply component 39. The annular groove 32 is fixedly installed on the top of the cylinder 14, and one end of the drive plate 31 extends into the interior of the annular groove 32. The limiting plate 34 is installed inside the annular groove 32, and the drive plate 31 is fixedly connected to the limiting plate 34. The conductive cylinder 36 is embedded in the top of the drive plate 31, and the conductive cylinder 36 is electrically connected to the drive motor 27. The first magnetic block 37 is fixedly installed on the top of the inner wall of the annular groove 32. The conductive block 38 is fixedly installed at the bottom of the first magnetic block 37, and the conductive block 38 is located directly above the conductive cylinder 36. The power supply component 39 is fixedly installed on the top of the annular groove 32, and the power supply component 39 is electrically connected to the conductive block 38. A second magnetic block 35 is fixedly installed on the drive plate 31. When the sliding block 25 moves upward, the drive plate 31 will drive the limiting plate 34 and the conductive cylinder 36 to move synchronously. The movement of the conductive cylinder 36 will cause the conductive block 38 to be inserted into the conductive cylinder 36, which will cause the second magnetic block 35 to move below the first magnetic block 37. The magnetic force generated by the two will limit the drive plate 31, so that the conductive cylinder 36 and the conductive block 38 are stably connected. The cooperation of the conductive block 38 and the conductive cylinder 36 will cause the current inside the power supply component 39 to flow into the drive motor 27, which will then cause the drive motor 27 to work and drive the fan blade 30 to move, assisting in the pressure relief process.

[0043] Furthermore, a guide shaft 33 is fixedly installed inside the annular groove 32, and a drive spring 46 is arranged around the guide shaft 33. One end of the drive spring 46 is fixedly connected to the top of the limiting plate 34, and the other end of the drive spring 46 is fixedly connected to the top of the inner wall of the annular groove 32. A drive block 45 is fixedly installed on the sliding block 25. When the drive plate 31 pushes the limit plate 34 to move, the guide shaft 33 will guide and limit the drive plate 31 to move smoothly. After the pressure is released, the drive spring 46 will reset and push the limit plate 34 to reset. When the limit plate 34 resets, it will separate the first magnetic block 37 and the second magnetic block 35, and at the same time, it will separate the conductive cylinder 36 and the conductive block 38, which will stop the drive motor 27 from working. At the same time, it will reset the sliding block 25 to seal and protect the top of the connector 15.

[0044] Furthermore, the locking head 2 is inlaid with a strip groove 40 corresponding to the exhaust groove 16. A push plate 41 is inserted inside the strip groove 40. The push plate 41 is located directly above the top of the drive block 45. A threaded cylinder 42 is fixedly installed inside the push plate 41. An adjusting screw 43 is rotatably installed inside the threaded cylinder 42. The adjusting screw 43 is rotatably connected to the strip groove 40. A knob 44 is fixedly connected to the top of the adjusting screw 43. When the sliding block 25 moves, it will drive the drive block 45 to move synchronously. When the sucker rod body 1 is moved to the outside and disassembled, the sliding block 25 does not reset, causing the first magnetic block 37 and the second magnetic block 35 to separate. Then, the knob 44 can be rotated to drive the adjusting screw 43 to rotate. The adjusting screw 43 and the threaded cylinder 42 will cooperate to move the push plate 41. After the push plate 41 moves down and contacts the drive block 45, it will push the sliding block 25 to reset, thereby allowing the first magnetic block 37 and the second magnetic block 35 to separate.

[0045] Working Principle: During oil production operations, the explosion-proof PE-coated sucker rod primarily transmits the mechanical power set on the surface to the oil well pump in the formation, enabling oil displacement, extraction, and hoisting. During use, the sucker rod body 1 is surrounded by a PE protective layer 5. This layer protects the surface of the sucker rod body 1. The main gas component in the oil well is methane. The PE protective layer 5, made of ultra-high molecular weight polyethylene, is water-impermeable, but small gas molecules can penetrate. After the sucker rod body 1 is inserted into the well, it is immersed in the produced fluid. The small methane molecules dissolved in the produced fluid can slowly permeate and diffuse into the PE protective layer 5, accumulating in the tiny gaps between the PE protective layer 5 and the metal rod body 1 until... The methane pressure inside the PE protective layer 5 is equal to the hydraulic pressure inside the tubing. In the 1500-meter well section, the pressure of methane penetrating into the coating reaches 15 MPa, increasing with depth. During the lifting operation, the sucker rod body 1 is lifted quickly, causing the methane inside the PE protective layer 5 to expand as the pressure inside the tubing decreases. Since the PE protective layer 5 is sealed to the outside, the methane gas can only slowly permeate out. Lifting from a depth of 1500 meters to the wellhead takes less than an hour. The gas pressure cannot be released in time, and near the wellhead, the pressure difference between the inside and outside of the PE protective layer 5 exceeds its yield strength. The gas expansion causes the PE coating to burst. To prevent damage to the PE protective layer 5, a threaded hole 6 is provided inside the locking head 2. The No. 1 vent hole 7, threaded hole 6, and No. 2 vent hole 10 work together to... The collected gas flows to vent 7 and can be discharged through threaded hole 6. The rupture disc 8 is made of PE and is normally used to seal and protect threaded hole 6, preventing external oil well produced fluid from entering the threaded hole 6. The thickness is set according to the required burst pressure. During rod lifting operations, if the pressure accumulated in the gap between the PE protective layer 5 and the sucker rod body 1 becomes too high, it will rupture the rupture disc 8. Pressure relief can then be achieved through the cooperation of vent 7, threaded hole 6, and vent 10, effectively preventing damage to the PE protective layer 5 from bursting. After removing the sucker rod body 1, repair only requires removing the clamping bolt 9 and replacing the rupture disc 8. During the use of the sucker rod body 1, the threaded hole 6 can also be sealed with adhesive. Because the adhesive has low strength and low burst pressure, on-site repair after a burst requires cleaning the threaded hole 6, which can be reused. During pressure relief, a rubber plug can be placed inside the threaded hole 6 to seal it. The rubber plug acts as a seal, and on-site repair simply requires replacing the hole with a new rubber plug. When the pressure accumulated in the gap between the PE protective layer 5 and the sucker rod body 1 is too high, and the pressure relief efficiency through the threaded hole 6 is insufficient, the air will flow into the pipe 13 through the cooperation of the air inlet head 11 and the flow pipe 12. The array of air inlets 11 can comprehensively release and relieve accumulated pressure. The gas will flow into the cylinder 14 through the cooperation of the pipe 13 and the connector 15.The sliding block 25 will be pushed upwards. When the side of the sliding block 25 is no longer sealed to the exhaust groove 16, exhaust pressure can be released through the exhaust groove 16. When the sliding block 25 moves upwards, the drive plate 31 will drive the limiting plate 34 and the conductive cylinder 36 to move synchronously. After the conductive cylinder 36 moves, the conductive block 38 is inserted into the conductive cylinder 36, which will cause the second magnetic block 35 to move below the first magnetic block 37. The magnetic force generated by the two will limit the drive plate 31, so that the conductive cylinder 36 and the conductive block 38 are stably connected. Through the cooperation of the conductive block 38 and the conductive cylinder 36, the current inside the power supply component 39 will flow into the drive motor 27, which will then drive the drive motor 27 to drive the fan blade 30 to move. When the fan blade 30 moves, it will assist the upward flow of air pressure, which can further assist in the pressure release. To improve pressure relief efficiency and effectively prevent damage to the PE protective layer 5, the upward flow of gas passes through the limiting block 28, which is conical and guides the airflow into the exhaust groove 16. The exhaust groove 16 provides rapid pressure relief, further preventing excessive pressure from causing the PE protective layer 5 to burst. This extends the service life of the explosion-proof PE-coated sucker rod. After pressure relief, the drive spring 46 resets, pushing the limiting plate 34 to reset. When the limiting plate 34 resets, it separates the first magnetic block 37 and the second magnetic block 35, and simultaneously separates the conductive cylinder 36 and the conductive block 38. This causes the drive motor 27 to stop working, and the sliding block 25 to reset, sealing the top of the connector 15.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A burst-proof PE fully enclosed sucker rod, characterized in that: The device includes a sucker rod body (1), which is surrounded by a PE protective layer (5). A locking head (2) is fixedly connected to the top of the sucker rod body (1). A threaded hole (6) is provided inside the locking head (2). A rupture disc (8) is provided inside the threaded hole (6). A clamping bolt (9) is threadedly connected inside the threaded hole (6). A first vent hole (7) corresponding to the threaded hole (6) is provided inside the locking head (2). The first vent hole (7) is connected to the threaded hole (6). The gap between the sucker rod body (1) and the PE protective layer (5) is connected to the other end of the first vent hole (7). A second vent hole (10) is provided through the clamping bolt (9). The locking head (2) is inlaid with a cylinder (14), and the cylinder (14) is symmetrically connected with an exhaust groove (16). The other end of the exhaust groove (16) extends out of the locking head (2). The exhaust groove (16) is provided with a sealing component. The sucker rod body (1) is provided with an array of exhaust components. The cylinder (14) is provided with an air extraction mechanism. The top of the cylinder (14) is provided with a driving mechanism.

2. The explosion-proof PE fully enclosed sucker rod according to claim 1, characterized in that: The exhaust assembly includes an air inlet head (11), a flow pipe (12), and a pipe (13). The air inlet heads (11) are arranged in an array on the sucker rod body (1). The flow pipe (12) corresponding to the air inlet head (11) is arranged inside the sucker rod body (1), and one end of the flow pipe (12) is connected to the air inlet head (11). The pipe (13) is embedded inside the sucker rod body (1), and the other end of the flow pipe (12) is connected to the pipe (13). A connector (15) is connected to the bottom of the cylinder (14), and the connector (15) is connected to the cylinder (14).

3. The explosion-proof PE fully enclosed sucker rod according to claim 2, characterized in that: The sealing assembly includes a sealing block (22), a baffle (24), and a reset assembly. The sealing block (22) is engaged inside the exhaust groove (16). The baffle (24) is fixedly connected to the side of the sealing block (22). The reset assembly for resetting the sealing block (22) is disposed on the exhaust groove (16). A sealing ring (23) is arranged around the sealing block (22).

4. The explosion-proof PE fully enclosed sucker rod according to claim 3, characterized in that: The sealing block (22) is rectangular, and the outer surface of the sealing block (22) is in contact with the inner wall of the exhaust groove (16). The sealing block (22) is used to seal the exhaust groove (16).

5. The explosion-proof PE fully enclosed sucker rod according to claim 4, characterized in that: The reset assembly includes a guide groove (17), a guide plate (18), a stop block (19), a square groove (20), and a reset spring (21). The guide groove (17) is symmetrically arranged on the exhaust groove (16). The guide plate (18) passes through the guide groove (17), and one end of the guide plate (18) is fixedly connected to the baffle (24). The stop block (19) is fixedly arranged inside the guide groove (17). The square groove (20) corresponding to the stop block (19) is arranged inside the guide plate (18), and the stop block (19) passes through the square groove (20). The reset spring (21) is arranged inside the square groove (20), and one end of the reset spring (21) is fixedly connected to the inner wall of the square groove (20), and the other end of the reset spring (21) is fixedly connected to the side of the stop block (19).

6. The explosion-proof PE fully enclosed sucker rod according to claim 1, characterized in that: The top of the locking head (2) is fixedly connected to a threaded head (3), and the bottom of the sucker rod body (1) is fixedly connected to a threaded sleeve (4).

7. The explosion-proof PE fully enclosed sucker rod according to claim 6, characterized in that: The air extraction mechanism includes a sliding block (25), a protective box (26), a drive motor (27), a limiting block (28), a drive rod (29), and a fan blade (30). The sliding block (25) is provided inside the cylinder (14), the protective box (26) is provided inside the sliding block (25), the drive motor (27) is fixedly provided inside the protective box (26), the limiting block (28) is fixedly provided at the bottom of the sliding block (25), the drive rod (29) is rotatably provided inside the limiting block (28), and one end of the drive rod (29) is fixedly connected to the output end of the drive motor (27). The fan blade (30) is fixedly provided on the drive rod (29), and the limiting block (28) is conical in shape.

8. The explosion-proof PE fully enclosed sucker rod according to claim 7, characterized in that: The top of the sliding block (25) is fixedly connected to a drive plate (31). The drive mechanism includes an annular groove (32), a limiting plate (34), a conductive cylinder (36), a first magnetic block (37), a conductive block (38), and a power supply component (39). The annular groove (32) is fixedly set on the top of the cylinder (14), and one end of the drive plate (31) extends into the annular groove (32). The limiting plate (34) is set inside the annular groove (32), and the drive plate (31) is fixedly connected to the limiting plate (34). The conductive cylinder (36) is fixedly connected to the first magnetic block (37). 6) Embedded on the top of the drive plate (31), and the conductive cylinder (36) is electrically connected to the drive motor (27). The first magnetic block (37) is fixedly set on the top of the inner wall of the annular groove (32). The conductive block (38) is fixedly set at the bottom of the first magnetic block (37), and the conductive block (38) is located directly above the conductive cylinder (36). The power supply component (39) is fixedly set on the top of the annular groove (32), and the power supply component (39) is electrically connected to the conductive block (38). The second magnetic block (35) is fixedly set on the drive plate (31).

9. The explosion-proof PE fully enclosed sucker rod according to claim 8, characterized in that: A guide shaft (33) is fixedly installed inside the annular groove (32). A drive spring (46) is arranged around the guide shaft (33). One end of the drive spring (46) is fixedly connected to the top of the limiting plate (34), and the other end of the drive spring (46) is fixedly connected to the top of the inner wall of the annular groove (32). A drive block (45) is fixedly installed on the sliding block (25).

10. A burst-proof PE fully enclosed sucker rod according to claim 9, characterized in that: The locking head (2) has a strip groove (40) inside that corresponds to the exhaust groove (16). A push plate (41) is inserted inside the strip groove (40). The push plate (41) is located directly above the top of the drive block (45). A threaded cylinder (42) is fixedly installed inside the push plate (41). An adjusting screw (43) is rotatably installed inside the threaded cylinder (42). The adjusting screw (43) is rotatably connected to the strip groove (40). A knob (44) is fixedly connected to the top of the adjusting screw (43).

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