Dual-motor sleeve dewaxing device

Abstract

This invention relates to the field of tubing dewaxing technology, specifically a dual-motor casing dewaxing device. It comprises, from top to bottom, an upper connecting assembly, a downhole electrical control assembly, a balance sub, a push assembly, an anchoring assembly, a rotating assembly, and a dewaxing assembly, all connected sequentially. The invention features a rational and compact structure. First, the device is hoisted to the wellhead via a logging cable. Communication is established between the surface control system and the dewaxing device via the logging cable. Then, the device is lowered to a designated location downhole via the logging cable. The surface control system controls the push assembly to drive the anchoring arm to simultaneously open and adhere to the well wall, while simultaneously driving the wax scraper to open and contact the wax-covered well wall. Next, the rotating assembly drives the wax scraper on the dewaxing assembly to rotate, thereby cutting the wax buildup on the well wall. Finally, the logging cable is pulled up at a certain speed, thus achieving continuous removal of wax buildup on the target well wall location. This invention is safe, labor-saving, simple, and highly efficient.

Description

Technical Field

[0001] This invention relates to the field of tubing dewaxing technology, specifically a dual-motor tubing dewaxing device. Background Technology

[0002] When stimulating old oil and gas wells, it is necessary to remove the wax buildup on the wellbore. Currently, the main methods of wax removal include using a dewaxing device driven by coiled tubing to move up and down in a reciprocating motion. This dewaxing device has a structure in which spiral blocks are arranged circumferentially around the main body, and springs are installed between the blocks and the main body to provide the adhesion force between the blocks and the wax buildup. Another method is hot washing to remove wax buildup.

[0003] Because coiled tubing is expensive to use, hot washing requires establishing pressure circulation inside the tubing, which is a complex process. Therefore, a low-cost, easy-to-use casing dewaxing instrument is needed. Summary of the Invention

[0004] This invention provides a dual-motor casing dewaxing device that overcomes the shortcomings of the prior art and can effectively solve the problems of high operating costs and complex construction processes in existing oil pipe dewaxing devices and processes.

[0005] The technical solution of this invention is achieved through the following measures: A dual-motor casing dewaxing device includes, from top to bottom, an upper connecting assembly, a downhole electrical control assembly, a balance sub, a push assembly, an anchoring assembly, a rotating assembly, and a dewaxing assembly connected together. The dewaxing assembly has several scraper groups spaced apart along its circumference. Each scraper group includes at least one scraper blade spaced apart along a spiral direction for scraping wax deposits on the well wall. The rotating assembly drives the scraper blades on the dewaxing assembly to rotate. The anchoring assembly has several scraper groups spaced apart along its circumference. Several anchoring arms are distributed circumferentially to abut against the wellbore. The push assembly drives the lower ends of the anchoring arms to open or retract synchronously, and simultaneously drives the lower ends of the scraper to open or retract synchronously. The balance short section is equipped with a piston ring for balancing the hydraulic pressure in the well. The downhole electrical control assembly transmits control signals to the push assembly and the rotary assembly and collects the operating data information of the push assembly and the rotary assembly. The upper connecting component is used to connect with the logging cable and enable the downhole electrical control assembly to communicate with the surface control system.

[0006] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0007] The aforementioned dewaxing assembly may include a base cone, a dewaxing shaft, a lower connecting arm, a connecting plate, a suspension connecting pipe, and a rotating base. The lower end of the base cone is a downwardly convex spherical surface. The base cone contains a stepped mounting groove that runs vertically through it. The upper outer side of the base cone has evenly spaced strip-shaped downward swing holes corresponding to the wax scraper and communicating with the mounting groove. Each downward swing hole contains an L-shaped lower connecting arm hinged to it. The first end of the lower connecting arm is detachably and fixedly mounted to the upper part of the wax scraper. The mounting groove contains a dewaxing shaft with its upper end positioned above the base cone. A connecting plate corresponding to the scraper assembly is fixedly mounted on the lower outer side of the dewaxing shaft. The outer side of the connecting plate is connected to the second end of the corresponding lower connecting arm, and the connecting plate can move vertically. The lower end of the wax scraper can retract or open synchronously. A tubular rotating seat with a sealing sleeve is provided above the bottom cone and is fitted on the outer side of the lower part of the dewaxing shaft. A rotating annular groove is provided on the outer side of the lower part of the rotating seat. A tubular suspension connecting pipe can be detachably installed in the rotating annular groove. The lower end of the suspension connecting pipe is fixedly installed together with the corresponding position of the upper end of the bottom cone. The upper part of the rotating seat has a first lubrication channel and a second lubrication channel with the lower end extending to the outer side of the lower part of the rotating seat. A one-way valve is installed at the upper end of the first lubrication channel. An oil filling plug is sealed and fixedly installed at the lower end of the first lubrication channel and the lower end of the second lubrication channel. The outer side of the upper part of the rotating seat and the upper part of the dewaxing shaft are respectively connected to the corresponding position of the lower part of the rotating assembly.

[0008] The second end of the lower connecting arm is provided with a U-shaped upper guide groove, and the upper end of the connecting plate is provided with a lower guide groove corresponding to the second end of the lower connecting arm. Each lower guide groove is equipped with a lower guide pin located in the corresponding upper guide groove. The lower part of the wax scraper is provided with an outward-opening wax discharge groove on the side away from the wax removal shaft, and a wax removal blade is fixed at the lower end of the wax scraper.

[0009] The aforementioned wax scraper can also be T-shaped, narrower at the top and wider at the bottom, with several wax scraper blades that are arc-shaped on the outer side distributed at intervals on the side of the lower part of the wax scraper away from the wax removal axis.

[0010] The aforementioned rotating assembly may include a rotating power cylinder, a lower motor cylinder, a wax scraper motor, a lower coupling, a lower protective sleeve, and a force transmission cylinder. The lower end of the rotating power cylinder is sealed and fixedly connected to the upper outer side of the rotating seat. The lower motor cylinder is fitted inside the upper inner side of the rotating power cylinder. The wax scraper motor is fixedly installed inside the lower motor cylinder. The lower end of the wax scraper motor has an output shaft. The lower end of the output shaft is connected to the upper end of the wax removal shaft through the lower coupling. The lower protective sleeve is fitted outside the lower coupling, and its upper end is fixedly installed together with the lower end of the wax scraper motor. The lower part of the lower protective sleeve is rotatably installed on the outer side of the wax removal shaft above the rotating seat. The force transmission cylinder is detachably and fixedly installed on the upper inner side of the lower motor cylinder corresponding to the upper position of the wax scraper motor. The upper inner side of the rotating power cylinder and the upper end of the force transmission cylinder are respectively connected to the corresponding positions of the lower part of the anchoring assembly.

[0011] The aforementioned anchoring assembly may include a lower transition joint, a main connecting rod, an upper connecting arm, and a push-back cylinder. The lower outer side of the lower transition joint is sealed and fixedly connected to the inner side of the upper end of the rotating power cylinder above the force transmission cylinder. The lower transition joint is sealed with a main connecting rod whose lower end is fitted onto the inner side of the upper end of the force transmission cylinder. The main connecting rod has a hollow structure. A number of radially penetrating strip-shaped sliding holes are evenly distributed along the circumference on the lower outer side of the lower transition joint corresponding to the lower position of the force transmission cylinder. The upper outer side of the force transmission cylinder is provided with a first positioning hole that corresponds to the sliding holes and is radially penetrating. A first positioning screw hole is provided on the outer side of the main connecting rod corresponding to each first positioning hole. Each sliding hole is provided with a first positioning screw hole whose end passes through the first positioning hole and is screwed to the corresponding position. The upper guide pin in the positioning screw hole is fixedly connected to the upper outer side of the lower transition joint and the lower inner side of the push cylinder. The lower outer side of the push cylinder has strip-shaped upper swing holes that correspond to the anchoring arm and are open inside and out. The upper part of the anchoring arm is hinged to the upper part of the upper swing hole. The upper outer side of the main connecting rod corresponding to the position of the upper swing hole is provided with a connecting ring groove. Each anchoring arm is connected to the upper end of the connecting ring groove with a Z-shaped upper connecting arm. The upper outer side of the main connecting rod has several strip-shaped lower sliding holes that are open inside and out. The inner side of the main connecting rod below the lower sliding hole has a lower limiting cone surface that is larger at the top and smaller at the bottom. The upper part of the main connecting rod and the upper end of the push cylinder are respectively connected to the corresponding positions of the lower part of the push assembly.

[0012] The lower part of the aforementioned anchoring arm is detachably equipped with a wear-resistant head located inside the lower part of the upper swing hole. The lower end of the wear-resistant head has an outwardly protruding arc surface on the side away from the main connecting rod. A lower anchoring pin is provided on the upper inner side of the upper swing hole. The first end of the upper connecting arm is rotatably installed together with the lower anchoring pin. The lower side of the first end of the upper connecting arm is fixedly installed together with the upper side of the corresponding anchoring arm. A vertical connecting plate is fixed on the bottom wall of the connecting ring groove corresponding to the position between two adjacent anchoring arms. The second end of the upper connecting arm is provided with a U-shaped hinge groove. An upper anchoring pin is fixedly installed in the hinge groove at the corresponding position of the connecting plate. A limiting plate matching the inclined section of the upper connecting arm is fixed between each pair of adjacent connecting plates.

[0013] The aforementioned push assembly may include an upper transition joint, a spring seat, a screw nut, a screw rod, a push motor, an upper motor cylinder, an upper coupling, a first connecting plug, and a potentiometer. The upper end of the push cylinder is fixedly connected to the lower end of the upper transition joint, which is sealed and fitted onto the outer side of the upper part of the main connecting rod. The outer side of the upper end of the upper transition joint is sealed and fixedly connected to the inner side of the lower end of the upper motor cylinder. A tubular spring seat with its upper end located above the main connecting rod is fitted onto the inner side of the upper end of the main connecting rod. An outer ring platform is fixed to the outer side of the upper end of the spring seat. The outer side of the lower end of the spring seat has an upper limit cone surface that matches the lower limit cone surface. A tubular screw nut is fitted between the outer side of the spring seat and the inner side of the upper transition joint. The inner side of the upper part of the screw nut has an upper limit step that matches the outer ring platform. The inner side of the screw nut corresponding to the upper end of the main connecting rod is fitted between the spring seat and the upper motor cylinder. The device is equipped with a pressure ring. A lower compression spring, fitted onto the outside of a spring seat, is located between the upper end of the pressure ring and the lower end of the outer ring platform. A lower connecting pin, corresponding to the sliding hole and capable of moving up and down within the sliding hole, is fixedly installed on the lower part of the nut. At least one internally and externally communicating lower wire-passing hole is provided at intervals along the circumference of the nut above the upper limit step. A placement groove is provided on the inner side of the upper transition joint corresponding to the upper side of the main connecting rod. A placement hole, internally and externally communicating, is provided on the outer side of the nut corresponding to the placement groove. A potentiometer is installed in the placement groove. The lower part of the moving end of the potentiometer is fixedly installed together with the pressure ring. A lead screw with a gap between its lower end and the upper end of the outer ring platform is screwed to the inner side of the upper end of the nut. Several diameters are distributed at intervals along the circumference of the upper transition joint corresponding to the position above the lower wire-passing hole. The upper sliding hole is a through-hole, and each upper sliding hole is provided with an upper connecting pin that is fixedly installed with the upper part of the screw nut. The outer side of the upper transition joint corresponding to the lower threading hole position is provided with an external threading hole that communicates internally and externally. The upper outer side of the upper transition joint above the upper sliding hole is provided with a threading ring groove. The lower side wall of the threading ring groove is provided with right and left threading holes that communicate with the external threading hole and the placement groove, respectively. At least one upper threading hole with its lower end communicating with the threading ring groove is distributed at intervals at the upper end of the upper transition joint. An upper shaft seat with its lower end fixedly installed with the upper part of the upper transition joint is rotatably mounted on the outer side of the middle part of the screw. The lower end of the upper shaft seat corresponding to each upper threading hole position is provided with a through-hole transition threading hole. The upper part of the upper motor barrel above the upper shaft seat... An upper mounting cylinder is fixedly installed on the side, and a push motor is fixedly installed inside the upper mounting cylinder. The lower end of the push motor has a drive shaft, and the lower end of the drive shaft is connected to the upper end of the lead screw through an upper coupling. An upper protective sleeve is fitted on the outside of the upper coupling, with its upper and lower ends fixedly installed together with the lower end of the push motor and the upper end of the upper shaft seat, respectively. A first connecting plug is fixedly installed on the inner side of the upper end of the upper mounting cylinder. An inner wire hole with internal and external communication is provided on the outer side of the upper mounting cylinder corresponding to the position between the first connecting plug and the push motor. A strip-shaped wire groove with its upper end communicating with the inner wire hole is provided on the lower end of the upper mounting cylinder. The upper end of the upper motor cylinder is sealed and fixedly connected to the lower end of the balance short section. The balance short section has a wire channel for passing through the cables connecting the lower drive motor, the push motor, the potentiometer, and the downhole electrical control assembly.

[0014] The aforementioned balance section may include a piston cylinder, a piston rod, an adapter, a second connector, and a third connector. The lower outer side of the piston cylinder is sealed and fixedly installed on the inner side of the upper motor cylinder above the upper mounting cylinder. A second connector, whose lower end is tightly inserted into the first connector, is fixedly installed on the inner side of the lower end of the piston cylinder. An inner ring platform is fixed on the inner side of the lower part of the piston cylinder corresponding to the position above the second connector. A hollow piston rod is sealed and passed through the inner side of the inner ring platform. An anti-reverse nut with a stepped surface on the upper inner side is fixedly installed on the inner side of the piston cylinder corresponding to the lower end of the inner ring platform. The lower end of the piston rod contacts the stepped surface. The upper outer side of the piston rod is fixedly installed together with the lower inner side of the adapter. The lower outer side of the adapter is sealed and fixedly installed together with the upper inner side of the piston cylinder. The upper end of the adapter... A third connector is fixedly installed on the inner side. The outer side of the adapter corresponding to the position between the third connector and the piston cylinder has pressure relief holes and oil injection holes that are evenly distributed around the circumference. Pressure relief valves and sealing plugs are installed in the pressure relief holes and oil injection holes, respectively. Several drain holes that are evenly distributed around the circumference are located on the outer side of the piston cylinder corresponding to the position above the inner ring platform. A piston ring is sealed between the inner side of the piston cylinder and the outer side of the piston rod above the drain hole. An upper compression spring is provided between the upper end of the piston ring and the lower end of the adapter and is fitted on the outer side of the piston rod. Several connecting holes that are evenly distributed around the upper outer side of the piston rod corresponding to the position of the upper compression spring are discretely distributed. The inner side of the adapter, the inner side of the piston rod, the inner side of the anti-reverse nut, and the lower inner side of the piston cylinder form a wire passage.

[0015] The aforementioned downhole electrical control assembly may include a circuit cylinder, a circuit frame, a processing module, and a control module. The lower inner side of the circuit cylinder is sealed and fixedly connected to the upper outer side of the adapter. A connecting plug is sealed and fixedly installed on the lower inner side of the circuit cylinder, with its upper end fixedly installed together with the middle of the third connecting plug. A circuit frame is provided inside the circuit cylinder at the position corresponding to the upper side of the connecting plug, with its lower end fixedly installed together with the upper end of the third connecting plug. Several support rings are arranged vertically at intervals on the outer side of the circuit frame. The processing module and the control module are arranged at intervals on the circuit frame. An insulating hole is provided at the upper end of the circuit frame, and an insulating plug is sealed and fixedly installed inside the insulating hole. The output end of the potentiometer is electrically connected to the input end of the processing module. The output end of the control module is electrically connected to the input end of the push motor and the input end of the dewaxing motor, respectively.

[0016] The aforementioned upper connection assembly may include an upper connector, a pin pressure plate, a fourth connecting plug, an insulating sleeve, a connecting sleeve, and a connecting pin. The inner side of the circuit tube at the upper end of the circuit frame is sealed and fixedly installed together with the outer side of the lower part of the upper connector. A pin pressure plate is fixedly installed at the upper end of the upper connector. A fourth connecting plug, whose upper end passes through the pin pressure plate and is located above the pin pressure plate, is sealed and installed on the inner side of the upper part of the upper connector. A fifth connecting plug is tightly fitted on the outer side of the lower part of the fourth connecting plug. An insulating sleeve is fitted between the inner side of the upper connector and the outer side of the fifth connecting plug. A connecting sleeve, whose upper part is tightly fitted on the outer side of the lower part of the fifth connecting plug, is installed on the inner side of the upper part of the insulating sleeve. A retaining ring is installed in the upper connector at the lower end of the insulating sleeve. A connecting pin, whose lower end is tightly fitted in the insulating plug, is installed in the retaining ring. An elastic reset element is installed in the insulating sleeve at the position between the upper end of the connecting pin and the lower end of the connecting sleeve.

[0017] This invention features a reasonable and compact structure. First, the invention is hoisted to the wellhead via a logging cable. The surface control system and the dewaxing instrument establish communication via the logging cable. Then, the invention is lowered to the designated location in the well via the logging cable. The surface control system controls the push assembly to drive the anchoring arm to open synchronously and adhere to the well wall. Simultaneously, it drives the wax scraper to open synchronously and contact the wax-covered well wall. Then, it controls the rotation assembly to drive the wax scraper on the dewaxing assembly to rotate, thereby cutting the wax on the well wall. Finally, the logging cable is lifted at a certain speed, thus realizing the continuous removal of wax from the well wall at the target location. It has the characteristics of safety, labor saving, simplicity, and high efficiency. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of a partial sectional view of the anchoring arm when the lower part is open in Example 1.

[0019] Appendix Figure 2 This is a schematic diagram of the front cross-sectional structure of the upper connecting component in Embodiment 1.

[0020] Appendix Figure 3 This is a schematic diagram of the front cross-sectional structure of section I of the downhole electrical control assembly in Example 1.

[0021] Appendix Figure 4 This is a schematic diagram of the main cross-sectional structure of section II of the downhole electrical control assembly in Example 1.

[0022] Appendix Figure 5 This is a schematic diagram of the main cross-sectional structure of section III of the downhole electrical control assembly in Example 1.

[0023] Appendix Figure 6 This is a schematic diagram of the main cross-sectional structure of section IV of the downhole electrical control assembly in Example 1.

[0024] Appendix Figure 7 This is a schematic diagram of the front sectional view of the balanced short section I in Example 1.

[0025] Appendix Figure 8 This is a schematic diagram of the front view sectional structure of the balanced short section II in Example 1.

[0026] Appendix Figure 9 This is a schematic diagram of the front cross-sectional structure of the push-fit assembly I section in Example 1.

[0027] Appendix Figure 10 This is a schematic diagram of the front sectional view of the push-fit assembly II section in Example 1.

[0028] Appendix Figure 11 This is a schematic diagram of the front cross-sectional structure of the push-fit assembly III section in Example 1.

[0029] Appendix Figure 12 This is a schematic diagram of the front sectional view of the lower part of the anchoring arm in the anchoring assembly in Example 1 when it is open.

[0030] Appendix Figure 13 This is a schematic diagram of the front sectional view of section I of the rotating assembly in Example 1.

[0031] Appendix Figure 14 This is a schematic diagram of the front sectional view of the rotating assembly section II in Example 1.

[0032] Appendix Figure 15 This is a schematic diagram of the front sectional view of the lower connecting arm of the wax scraper assembly in Example 1 when it is open.

[0033] Appendix Figure 16 For the appendix Figure 12 A top-view enlarged cross-sectional structural diagram of the upper and middle connecting arms.

[0034] Appendix Figure 17 For the appendix Figure 15 A top-view enlarged cross-sectional structural diagram of the lower connecting arm.

[0035] Appendix Figure 18 This is a three-dimensional structural diagram of the wax scraper in Example 2.

[0036] The codes in the attached diagram are as follows: 1 for wax scraper, 2 for anchoring arm, 3 for wax discharge groove, 4 for wax removal blade, 5 for wax scraper blade, 6 for bottom cone, 7 for lower swing hole, 8 for lower connecting arm, 9 for wax removal shaft, 10 for connecting plate, 11 for rotating seat, 12 for suspension connecting pipe, 13 for first lubrication channel, 14 for second lubrication channel, 15 for one-way valve, 16 for oil injection plug, 17 for upper guide groove, 18 for lower guide pin, 19 for rotating power cylinder, 20 for lower motor cylinder, 21 for wax scraper motor, and 22 for lower link. Shaft assembly, 23 is the lower protective sleeve, 24 is the force transmission cylinder, 25 is the lower transition joint, 26 is the main connecting rod, 27 is the upper connecting arm, 28 is the push cylinder, 29 is the sliding hole, 30 is the upper guide pin, 31 is the upper swing hole, 32 is the connecting ring groove, 33 is the lower sliding hole, 34 is the wear-resistant head, 35 is the lower anchor pin, 36 is the connecting plate, 37 is the upper anchor pin, 38 is the limiting plate, 39 is the upper transition joint, 40 is the spring seat, 41 is the outer ring platform, 42 is the threaded nut, 43 is the threaded rod, 44 is the push motor, 45 is... Upper motor cylinder, 46 is the first connecting plug, 47 is the potentiometer, 48 is the lower wire hole, 49 is the pressure ring, 50 is the lower compression spring, 51 is the lower connecting pin, 52 is the upper sliding hole, 53 is the upper connecting pin, 54 is the wire ring groove, 55 is the outer wire hole, 56 is the upper shaft seat, 57 is the upper mounting cylinder, 58 is the upper protective sleeve, 59 is the wire groove, 60 is the piston cylinder, 61 is the piston rod, 62 is the piston ring, 63 is the adapter, 64 is the second connecting plug, 65 is the third connecting plug, 66 is the inner ring platform, 6 7 is the anti-reverse nut, 68 is the pressure relief valve, 69 is the sealing plug, 70 is the drain hole, 71 is the upper compression spring, 72 is the connecting hole, 73 is the circuit tube, 74 is the circuit frame, 75 is the processing module, 76 is the control module, 77 is the connecting plug, 78 is the support ring, 79 is the insulating plug, 80 is the upper connector, 81 is the pin pressure plate, 82 is the fourth connecting plug, 83 is the fifth connecting plug, 84 is the insulating sleeve, 85 is the connecting sleeve, 86 is the connecting pin, 87 is the retaining ring, and 88 is the elastic reset component. Detailed Implementation

[0037] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0038] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0039] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0040] Example 1: As shown in the attached document Figures 1 to 17As shown, the dual-motor casing dewaxing device includes, from top to bottom, an upper connecting assembly, a downhole electrical control assembly, a balance sub, a push assembly, an anchoring assembly, a rotating assembly, and a dewaxing assembly. The dewaxing assembly has several scraper groups spaced circumferentially on its surface. Each scraper group includes at least one scraper blade 1 spaced circumferentially for scraping wax deposits on the wellbore. The rotating assembly drives the scraper blades 1 on the dewaxing assembly to rotate. The anchoring assembly has several... The anchoring arm 2, which abuts against the well wall, is driven by the push assembly to simultaneously open or retract the lower end of the anchoring arm 2, and simultaneously to open or retract the lower end of the scraper blade 1. The balance short section is provided with a piston ring 62 for balancing the hydraulic pressure in the well. The downhole electrical control assembly is used to transmit control signals to the push assembly and the rotary assembly and to collect the operating data information of the push assembly and the rotary assembly. The upper connecting component is used to connect with the logging cable and enable the downhole electrical control assembly to communicate with the surface control system.

[0041] In use, the invention is first hoisted to the wellhead via a logging cable on the ground. Communication is established between the ground control system and the dewaxing instrument via the logging cable. Then, the invention is lowered to the designated location in the well via the logging cable. The ground control system controls the push assembly to drive the anchoring arm 2 on the anchoring assembly to simultaneously open and press against the well wall. Simultaneously, the dewaxing assembly's scraper 1 opens to contact the wax-covered well wall. Then, the rotation assembly drives the scraper 1 to rotate, thereby cutting the wax buildup on the well wall. Finally, the logging cable and the invention are raised at a certain speed, thus continuously removing the wax buildup on the well wall at the target location. The spiral staggered distribution ensures complete removal of wax from the well wall and circumference by the wax scraper 1. During operation, the wax scraper 1 opens to a certain wax removal thickness, and a single lift of the wax remover can completely remove wax from a well diameter. This is suitable for operations where complete removal of wax is not required, but a certain well wall diameter must be maintained. The balance short section stores hydraulic oil, and the pressure difference between the hydraulic oil and the well fluid drives the piston ring to move axially until a balance is reached. This ensures that the pressure is consistent with the well fluid pressure at different temperatures, preventing damage to components due to excessive pressure. The invention has a reasonable and compact structure, is easy to use, and has an ingenious design. It is safe, labor-saving, simple, and efficient.

[0042] The above-mentioned dual-motor bushing dewaxing device can be further optimized and / or improved according to actual needs:

[0043] As attached Figure 1 , 15As shown in Figure 17, the dewaxing assembly includes a bottom cone 6, a dewaxing shaft 9, a lower connecting arm 8, a connecting plate 10, a suspension connecting pipe 12, and a rotating seat 11. The lower end of the bottom cone 6 is a downwardly convex spherical surface. The bottom cone 6 has a stepped mounting groove that runs vertically through it. The upper outer side of the bottom cone 6 has strip-shaped lower swing holes 7 that correspond to the wax scraper 1 and communicate with the mounting groove, evenly distributed along the circumference. Each lower swing hole 7 has an L-shaped lower connecting arm 8 hinged in it. The first end of the lower connecting arm 8 is detachably and fixedly installed to the upper part of the wax scraper 1. The mounting groove has a dewaxing shaft 9 with its upper end located above the bottom cone 6. The lower outer side of the dewaxing shaft 9 is fixedly installed with a connecting plate 10 corresponding to the scraper assembly. The outer side of the connecting plate 10 is connected to the second end of the corresponding lower connecting arm 8. When the connecting plate 10 moves up and down... The lower end of the wax scraper 1 can retract or open synchronously. Above the bottom cone 6, there is a tubular rotating seat 11 that is sealed and fitted to the lower outer side of the dewaxing shaft 9. The lower outer side of the rotating seat 11 is provided with a rotating annular groove. A tubular suspension connecting pipe 12 is detachably installed in the rotating annular groove. The lower end of the suspension connecting pipe 12 is fixedly installed together with the corresponding position of the upper end of the bottom cone 6. The upper end of the rotating seat 11 has a first lubrication channel 13 and a second lubrication channel 14 that both extend to the lower outer side of the rotating seat 11. A one-way valve 15 is installed at the upper end of the first lubrication channel 13. Oil plugs 16 are sealed and fixedly installed at the lower ends of the first lubrication channel 13 and the lower ends of the second lubrication channel 14. The upper outer side of the rotating seat 11 and the upper part of the dewaxing shaft 9 are respectively connected to the corresponding positions of the lower part of the rotating assembly.

[0044] According to the requirements, the suspension connecting pipe 12 consists of two symmetrical half-pipes that can be detachably installed in the rotating annular groove through a connector, which facilitates the rotation of the bottom cone 6 with the dewaxing shaft 9 and can be connected to the rotating seat 11. The rotating annular groove can support the suspension connecting pipe 12 and also allow the suspension connecting pipe 12 to rotate with the bottom cone 6 in the rotating annular groove. The oil filling plug 16 and the one-way valve 15 are both existing known technologies. The lower swing hole 7 has a stepped surface at the bottom for supporting the wax scraper 1 after it is retracted. During use, the lower end of the bottom cone 6 has a downwardly convex spherical surface, which serves as a guide to prevent jamming during insertion into the oil well. The strip-shaped lower swing hole 7 is used to store the wax scraper 1 and the lower connecting arm 8. The corner of the lower connecting arm 8 is hinged to the upper inner side of the lower swing hole 7. The lower swing hole 7 guides the lower connecting arm 8. When the lower connecting arm 8 rotates, it supports the lower connecting arm 8, reducing the torque on the dewaxing shaft 9 when the lower connecting arm 8 rotates with the dewaxing shaft 9 to scrape the wax on the well wall, thus reducing the failure rate of the dewaxing shaft 9. When the dewaxing shaft 9 rotates, it can carry... The moving scraper 1 scrapes away the wax buildup on the well wall. The rotating annular groove facilitates the rotatable connection of the bottom cone 6 to the rotating seat 11 via the suspension connecting pipe 12. When the dewaxing shaft 9 rotates, the bottom cone 6 and the suspension connecting pipe 12 can rotate relative to the rotating seat 11, making maintenance convenient. The first lubrication channel 13 allows hydraulic oil to be injected to lubricate the outside of the dewaxing shaft 9, reducing wear on the shaft. The one-way valve 15 facilitates the injection of high-pressure hydraulic oil into the first lubrication channel 13, and old hydraulic oil can be discharged from the second lubrication channel 14, making hydraulic oil replacement more efficient.

[0045] As attached Figure 1 , 15 As shown in Figure 17, the second end of the lower connecting arm 8 is provided with a U-shaped upper guide groove 17, and the upper end of the connecting plate 10 is provided with a lower guide groove corresponding to the second end of the lower connecting arm 8. Each lower guide groove is equipped with a lower guide pin 18 located in the corresponding upper guide groove 17. The lower part of the wax scraper 1 is provided with an outward-opening wax discharge groove 3 on the side away from the wax removal shaft 9. The lower end of the wax scraper 1 is fixed with a wax removal blade 4.

[0046] Depending on the requirements, the lower guide groove can also be formed by a pair of connecting ears. The first end of the rightmost lower connecting arm 8 is provided with a downward-opening wax scraper 1 mounting groove. The upper part of the wax scraper 1 is located in the wax scraper 1 mounting groove and can be detachably installed together by two screws spaced apart vertically. The lower end of the rightmost wax scraper 1 is fixed with a wax removal blade 4. The blade of the wax removal blade 4 is inclined from top to bottom and from left to right. Several fracture notches are spaced apart on the blade of the wax removal blade 4 to reduce the fracture length of the wax removal blade 4. The lower right end of the wax removal blade 4 is provided with an arc-shaped chamfer. In use, this setting facilitates the replacement and maintenance of the wax scraper 1. By replacing the wax scraper 1 with different specifications, wax of different specifications and different states on the well wall can be scraped off. By setting the lower guide groove, the upper guide groove 17 and the lower guide pin 18, the lower connecting arm 8 is always connected to the wax removal shaft 9 during the swinging process. This setting can reduce the difficulty of disassembling and assembling the lower connecting arm 8 and the connecting plate 10.

[0047] Example 2: As shown in the attached document Figure 18 As shown, the wax scraper 1 is T-shaped, narrow at the top and wide at the bottom. Several wax scraper blades 5 with arc-shaped outer sides are distributed at intervals on the side of the lower part of the wax scraper 1 away from the wax removal shaft 9.

[0048] The only difference between this embodiment and Embodiment 1 is the arrangement of the wax scraper 1. As required, the first end of the lower connecting arm 8 has a downward-facing groove, and the upper part of the wax scraper 1 is positioned within this groove. It is detachably mounted together using two screws spaced apart vertically. This arrangement facilitates the replacement and maintenance of the wax scraper 1 during use. By replacing the wax scraper 1 with different specifications, wax deposits of different sizes and in different states on the well wall can be scraped off.

[0049] As attached Figure 1 , 14 As shown in Figures 15 and 17, the rotating assembly includes a rotating power cylinder 19, a lower motor cylinder 20, a wax scraper motor 21, a lower coupling 22, a lower protective sleeve 23, and a force transmission cylinder 24. The lower end of the rotating power cylinder 19 is sealed and fixedly connected to the upper outer side of the rotating seat 11. The lower motor cylinder 20 is fitted inside the upper part of the rotating power cylinder 19. The wax scraper motor 21 is fixedly installed inside the lower motor cylinder 20. The lower end of the wax scraper motor 21 has an output shaft. The lower end of the output shaft is connected to the upper end of the wax removal shaft 9 through the lower coupling 22. The lower protective sleeve 23 is fitted outside the lower coupling 22, and its upper end is fixedly installed together with the lower end of the wax scraper motor 21. The lower part of the lower protective sleeve 23 is rotatably installed on the outside of the wax removal shaft 9 above the rotating seat 11. The force transmission cylinder 24 is detachably and fixedly installed on the upper inner side of the lower motor cylinder 20 corresponding to the upper position of the wax scraper motor 21. The upper inner side of the rotating power cylinder 19 and the upper end of the force transmission cylinder 24 are respectively connected to the corresponding positions of the lower part of the anchoring assembly.

[0050] According to the requirements, the wax scraper motor 21 is a known prior art technology, such as a geared motor. The lower coupling 22 is also a known prior art technology. Known thrust bearings are installed between the inner upper part and the inner lower part of the lower protective sleeve 23 and the outer side of the dewaxing shaft 9. The inner upper part of the lower motor cylinder 20 and the outer upper part of the force transmission cylinder 24 are detachably fixed together by a number of screws spaced along the circumference. During use, the lower motor cylinder 20 provides insulation and sealing for the wax scraper motor 21 and also serves as a guide. The lower protective sleeve 23 reduces the axial force on the lower coupling 22 during the up-and-down movement of the wax scraper motor 21 and the dewaxing shaft 9, extending the service life of the lower coupling 22. Simultaneously, the lower end of the lower protective sleeve 23, after moving down and contacting the upper end of the rotating seat 11, provides a limiting support, thereby protecting the dewaxing shaft 9.

[0051] As attached Figure 1 , 12 As shown in Figures 13 and 16, the anchoring assembly includes a lower transition joint 25, a main connecting rod 26, an upper connecting arm 27, and a push cylinder 28. The lower outer side of the lower transition joint 25 is sealed and fixedly connected to the inner side of the upper end of the rotating power cylinder 19 above the force transmission cylinder 24. The lower transition joint 25 has a main connecting rod 26, the lower end of which is fitted onto the inner side of the upper end of the force transmission cylinder 24. The main connecting rod 26 has a hollow structure. A number of radially penetrating strip-shaped sliding holes 29 are evenly distributed along the circumference on the lower outer side of the lower transition joint 25 corresponding to the lower position of the force transmission cylinder 24. The upper outer side of the force transmission cylinder 24 has a first positioning hole that corresponds to the sliding hole 29 and is radially penetrating. The outer side of the main connecting rod 26 corresponding to each first positioning hole has a first positioning screw hole. Each sliding hole 29 has a screw thread that passes through the first positioning hole and is screwed to the corresponding position. The upper guide pin 30 in the first positioning screw hole is fixedly connected to the upper outer side of the lower transition joint 25 and the lower inner side of the push cylinder 28. The lower outer side of the push cylinder 28 has strip-shaped upper swing holes 31 that correspond to the anchor arm 2 and are open to the inside and outside along the circumference. The upper part of the anchor arm 2 is hinged to the upper part of the upper swing hole 31. The upper outer side of the main connecting rod 26 corresponding to the position of the upper swing hole 31 is provided with a connecting ring groove 32. Each anchor arm 2 is connected to the upper end of the connecting ring groove 32 with a Z-shaped upper connecting arm 27. The upper outer side of the main connecting rod 26 has several strip-shaped lower sliding holes 33 that are open to the inside and outside along the circumference. The inner side of the main connecting rod 26 corresponding to the position below the lower sliding hole 33 has a lower limiting cone surface that is larger at the top and smaller at the bottom. The upper part of the main connecting rod 26 and the upper end of the push cylinder 28 are respectively connected to the corresponding positions of the lower part of the push assembly.

[0052] According to requirements, a lower sealing ring is provided between the upper inner side of the lower transition joint 25 and the outer side of the main connecting rod 26. A lower oil scraper ring is provided between the upper inner side of the lower transition joint 25 above the lower sealing ring and the main connecting rod 26. A lower oil drain hole with internal and external communication is provided on the upper inner side of the lower transition joint 25 corresponding to the position between the lower sealing ring and the lower oil scraper ring. The lower part of the upper swing hole 31 has a support step for supporting the wear-resistant head 34 when it is retracted. During use, the strip-shaped sliding hole 29 allows the main connecting rod 26 to move up and down, driving the upper guide pin 30 and the force transmission cylinder 24 to move up and down. At the same time, the upper guide pin 30 moves up and down in the sliding hole 29, which limits and guides the main connecting rod 26 when it moves up and down. The upper swing hole 31 allows the anchoring arm 2 to be retracted into the upper swing hole 31 when the invention is lowered into the well. The Z-shaped upper connecting arm 27 can open the lower part of the anchoring arm 2 at a large angle through the slight axial movement of the main connecting rod 26. It also facilitates the connection between the upper connecting arm 27 and the main connecting rod 26. The main connecting rod 26 has a hollow structure, which makes it easy to pass the lower end of the control cable through the main connecting rod 26 and the force transmission cylinder 24 and connect it to the input end of the scraper motor 21. It also facilitates the separation of the cable passage and the well fluid environment, and avoids the processing cost of separately opening a cable passage on the cylinder wall. The setting of the lower limit cone surface can avoid the impact on the main connecting rod 26 when the lower end of the push assembly moves downward on the upper inner side of the main connecting rod 26, and reduce the vibration of the invention during operation.

[0053] As attached Figure 1 , 12 As shown in Figure 16, a wear-resistant head 34 is detachably installed on the lower part of the anchoring arm 2, located on the inner side of the lower part of the upper swing hole 31. The lower end of the wear-resistant head 34 has an outwardly protruding arc surface on the side away from the main connecting rod 26. A lower anchoring pin 35 is provided on the inner side of the upper part of the upper swing hole 31. The first end of the upper connecting arm 27 is rotatably installed together with the lower anchoring pin 35. The lower side of the first end of the upper connecting arm 27 is fixedly installed together with the upper side of the corresponding anchoring arm 2. A vertical connecting plate 36 is fixed on the bottom wall of the connecting ring groove 32 corresponding to the position between two adjacent anchoring arms 2. The second end of the upper connecting arm 27 is provided with a U-shaped hinge groove. An upper anchoring pin 37 is fixedly installed in the hinge groove at the corresponding position of the connecting plate 36. A limiting plate 38 matching the inclined section of the upper connecting arm 27 is fixed between each two adjacent connecting plates 36.

[0054] According to the requirements, there are 3 upper connecting arms 27. The connecting plate 36, the limiting plate 38 and the main connecting rod 26 are integrally formed. The bottom wall cross section of the connecting ring groove 32 formed by the connecting plate 36, the limiting plate 38 and the main connecting rod 26 is hexagonal. The push cylinder 28 corresponding to each upper anchor pin 37 position is provided with a stepped pressing groove with internal and external communication. The connecting pressure plate can be detached and fixedly installed in each pressing groove to facilitate the installation and removal of the upper anchor pin 37. The second end of the upper connecting arm 27 is provided with a U-shaped hinge groove. The hinge groove is set along the length direction of the upper connecting arm 27. The hinge groove is U-shaped. When the upper anchor pin 37 moves up and down with the main connecting rod 26, it can make the upper anchor pin 37 move relative to the inner wall of the hinge groove, smoothly driving the first end of the upper connecting arm 27 to swing up and down, and finally driving the lower part of the anchor arm 2 and the wear-resistant head 34 to open or retract. The second end of the upper connecting arm 27 can also be provided with a fan-shaped annular hinge groove coaxially set with the lower anchor pin 35. During use, the connecting plate 36 is positioned between the two upper connecting arms 27, facilitating the installation of the upper connecting arms 27 within the connecting ring groove 32. By setting the upper anchoring pin 37 and the hinge groove, the up-and-down movement of the main connecting rod 26 can be converted into the up-and-down swinging of the first end of the upper connecting arm 27, ultimately resulting in the swinging of the lower part of the anchoring arm 2. The U-shaped hinge groove is easier to manufacture and reduces the requirements for machining accuracy. The wear-resistant head 34 extends the service life of the anchoring arm 2 and facilitates replacement and maintenance after wear. The lower end of the wear-resistant head 34 has an outwardly convex arc surface on the side away from the main connecting rod 26. This arc surface increases the contact area between the lower end of the anchoring arm 2 and the well wall after it is opened, allowing the wear-resistant head 34 to abut against the well wall, thus providing support for the invention.

[0055] As attached Figure 9 , 10As shown in Figure 11, the push assembly includes an upper transition joint 39, a spring seat 40, a screw nut 42, a lead screw 43, a push motor 44, an upper motor cylinder 45, an upper coupling, a first connecting plug 46, and a potentiometer 47. The upper end of the push cylinder 28 is fixedly connected to the lower end of the upper transition joint 39, which is sealed and fitted on the outer side of the upper part of the main connecting rod 26. The outer side of the upper end of the upper transition joint 39 is sealed and fixedly connected to the inner side of the lower end of the upper motor cylinder 45. A tubular spring seat 40 with its upper end located above the main connecting rod 26 is fitted on the inner side of the upper end of the main connecting rod 26. An outer ring platform 41 is fixed on the outer side of the upper end of the spring seat 40. The outer side of the lower end of the spring seat 40 has an upper limit cone surface that matches the lower limit cone surface. A tubular screw nut 42 is fitted between the outer side of the spring seat 40 and the inner side of the upper transition joint 39. The inner side of the upper part of the nut 42 has an upper limit step that matches the outer ring platform 41. A pressure ring 49 is installed between the inner side of the nut 42 and the spring seat 40 at the upper end of the main connecting rod 26. A lower compression spring 50 fitted on the outside of the spring seat 40 is provided between the upper end of the pressure ring 49 and the lower end of the outer ring platform 41. A lower connecting pin 51 is fixedly installed at the lower part of the nut 42, which corresponds to the sliding hole 33 and can move up and down in the sliding hole 33. At least one lower wire hole 48 with internal and external communication is provided at intervals along the circumference on the outer side of the nut 42 above the upper limit step. A placement groove is provided on the inner side of the upper transition joint 39 at the upper side of the main connecting rod 26. A placement hole with internal and external communication is provided on the outer side of the nut 52 at the position of the placement groove. A potentiometer is provided in the placement groove. 47. The lower part of the moving end of the potentiometer 47 is fixedly installed together with the pressure ring 49. The inner side of the upper end of the nut 42 is screwed with a lead screw 43 with a gap between its lower end and the upper end of the outer ring platform 41. The upper transition joint 39 above the lower wire hole 48 has several radially penetrating strip-shaped upper sliding holes 52 distributed circumferentially. Each upper sliding hole 52 is provided with an upper connecting pin 53 fixedly installed together with the upper part of the nut 42. The outer side of the upper transition joint 39 corresponding to the lower wire hole 48 is provided with an outer wire hole 55 that communicates with both inside and outside. The outer side of the upper transition joint 39 above the upper sliding hole 52 is provided with a wire ring groove 54. The lower side wall of the wire ring groove 54 is provided with right wire holes and left wire holes that communicate with the outer wire holes 55 and the placement groove, respectively. The upper transition joint 39 has at least one upper wire-passing hole at intervals on its upper end, with its lower end communicating with the wire-passing ring groove 54. An upper shaft seat 56 is rotatably mounted on the outer side of the middle part of the lead screw 43, with its lower end fixedly mounted to the upper part of the upper transition joint 39. A through-hole is provided at the lower end of the upper shaft seat 56 corresponding to each upper wire-passing hole. An upper mounting cylinder 57 is fixedly mounted on the inner side of the upper motor cylinder 45 above the upper shaft seat 56. A push-pull motor 44 is fixedly mounted inside the upper mounting cylinder 57. The lower end of the push-pull motor 44 has a drive shaft, and the lower end of the drive shaft is connected to the upper end of the lead screw 43 via an upper coupling. An upper protective sleeve 58 is fitted on the outer side of the upper coupling, with its upper and lower ends fixedly mounted to the lower end of the push-pull motor 44 and the upper end of the upper shaft seat 56, respectively.A first connecting plug 46 is fixedly installed on the inner side of the upper end of the upper mounting cylinder 57. An inner wiring hole, communicating with the outside, is provided on the outer side of the upper mounting cylinder 57 corresponding to the position between the first connecting plug 46 and the push motor 44. A strip-shaped wiring groove 59, with its upper end communicating with the inner wiring hole, is provided at the lower end of the upper mounting cylinder 57. The upper end of the upper motor cylinder 45 is sealed and fixedly connected to the lower end of the balance short section. The balance short section contains a wiring channel for passing cables connecting the lower drive motor, the push motor 44, the potentiometer 47, and the downhole electrical control assembly.

[0056] According to the requirements, an upper sealing ring and an upper oil scraper ring are provided at intervals between the inner side of the upper transition joint 39 and the outer side of the main connecting rod 26. The upper oil scraper ring is located above the upper swing hole 31. An upper oil drain hole with internal and external communication is provided on the inner side of the upper transition joint 39 between the upper sealing ring and the upper oil scraper ring. The potentiometer 47 is a known technology, such as the KTR series miniature potentiometer. A potentiometer mounting base is installed on the lower part of the moving end of the potentiometer 47. The potentiometer mounting base and the pressure ring 49 are fixed together by a pin passing through the placement hole. The upper end of the potentiometer mounting base and the lower part of the potentiometer 47 have a return spring fitted on the outer side of the moving end of the potentiometer 47. The opening force of the wear-resistant head 34 is provided by the lower compression spring 50. This elastic design ensures that the wear-resistant head 34 and the well wall are elastically pushed together during the dewaxing operation, resulting in better dewaxing effect. At the same time, the state of wax on the well wall changes with temperature. The push motor 44 drives the screw nut 42 to provide pre-pressure to the lower compression spring 50, ensuring that the cutting depth of the wear-resistant head 34 and the wax scraper 1 on the wax on the well wall is controllable, and the cutting force of the wax scraper 1 on the wax on the well wall is controllable, avoiding damage to the well wall when the wax on the well wall is thin. In this application, the push motor 44 can be stopped when lifting. The push motor 44 is not energized, which has an energy-saving effect. When the lifting resistance is too high, there is no need to retract the dewaxing device. The component of the lifting resistance can cause the wear-resistant head 34 to act on the main connecting rod 26 and the lower compression spring 50, retract, and then continue to be lifted. The potentiometer 47 can monitor the opening amplitude of the wear-resistant head 34 and the anchor arm 2 to detect the dewaxing effect. The ground control system includes a monitoring module for the speed, current, and voltage data of the push motor 44 and the wax scraper motor 21, a wellbore monitoring module, and a wellbore curve display module.

[0057] In use, the dewaxing device is first activated via the ground control system: the push motor 44 is started, and its drive shaft drives the upper coupling and lead screw to rotate. Under the action of the upper connecting pin 53, the lead screw nut 42 moves downward, causing the spring seat 40 to move downward and compress the lower compression spring 50. At the same time, the moving end of the potentiometer 47 generates a first displacement signal under the action of the pressure ring 49 moving downward. Under the action of the lower compression spring 50 and the pressure ring 49, the upper part of the lower connecting pin 51 abuts against the upper inner wall of the sliding hole 33, causing the main... When the connecting rod 26 moves downward, it causes the upper anchoring pin 37 to move downward. The upper anchoring pin 37 moves relative to the inner wall of the hinge groove. The upper anchoring pin 37 causes the second end of the upper connecting arm 27 to swing downward, and the first end of the upper connecting arm 27 to swing upward. This causes the lower part of the anchoring arm 2 and the wear-resistant head 34 to open and approach the well wall. When the main connecting rod 26 moves downward, the lower end of the main connecting rod 26 causes the upper guide pin 30 to move downward in the sliding hole 29. The upper guide pin 30 drives the force transmission cylinder 24, the lower motor cylinder 20, the wax scraper motor 21, and the lower connecting rod 26 to move downward. The shaft assembly 22, lower protective sleeve 23, and dewaxing shaft 9 move downwards. As the dewaxing shaft 9 moves downwards, it drives the connecting disc 10 to move downwards. As the connecting disc 10 moves downwards, the lower guide pin 18 moves relative to the upper guide groove 17. The lower guide pin 18 drives the second end of the lower connecting arm 8 to swing downwards. Finally, the first end of the lower connecting arm 8 drives the scraper 1 to open outwards and approach the well wall. Once the wear-resistant head 34 is in contact with the well wall, the main connecting rod 26 no longer moves downwards. Therefore, the displacement signal of the potentiometer 47 will no longer change. At this time, the screw nut 42 drives the spring seat 40 to continue to move downward to compress the lower compression spring 50. The upper part of the lower connecting pin 51 can continue to move downward in the sliding hole 33 to continue to compress the lower compression spring 50. The pressure of the screw nut 42 increases, which in turn causes the load of the push motor 44 to increase through the screw 43. That is, the current of the push motor 44 increases and the speed decreases. The electrical control assembly located downhole processes this change and sends it to the surface control system. The surface operator stops the push action and shuts down the push motor 44 according to this change.

[0058] Then, the operator starts the dewaxing work through the ground control system: start the wax scraping motor 21, which drives the lower coupling 22, the dewaxing shaft 9, the connecting plate 10, the lower connecting arm 8, the wax scraping blade 1, the suspension connecting pipe 12 and the bottom cone 6 to rotate through the output shaft. The wax scraping blade 1 will effectively cut the wax on the well wall. At this time, the ground operator notifies the winch operator to raise the logging cable at a certain speed so that the wax scraping blade 1 can carry out the wax removal operation on the well wall within the target position section.

[0059] After the wax removal operation at the effective well depth is completed, the ground operator first stops the wax removal work through the ground control system: the wax scraper motor 21 is stopped, and the lower coupling 22, wax removal shaft 9, connecting plate 10, lower connecting arm 8, wax scraper 1, suspension connecting pipe 12 and bottom cone 6 stop rotating.

[0060] Then, the ground operator performs the arm retraction action through the ground control system: the drive shaft of the push motor 44 rotates in the reverse direction, which drives the upper coupling and lead screw 43 to rotate in the reverse direction. Under the action of the upper connecting pin 53, the lead screw nut 42 moves upward, and the spring seat 40 moves upward under the action of the lower compression spring 50. At the same time, the potentiometer 47 generates a second displacement signal under the action of the pressure ring 49 moving upward. The lead screw nut 42 continues to move upward, and the spring seat 40 continues to move upward under the action of the lower compression spring 50. Finally, the upper part of the lower connecting pin 51 abuts against the inner side of the upper part of the sliding hole 33. After the lead screw nut 42 continues to move upward, it drives the main connecting rod 26 to move upward, and then drives the upper anchoring pin 37 to move upward. The upper anchoring pin 37 moves relative to the inner wall of the hinge groove. The upper anchoring pin 37 drives the first end of the upper connecting arm 27 to swing downward, and then drives the lower part of the anchoring arm 2 and the wear-resistant head 34 to retract to the upper swing hole. When the main connecting rod 26 moves upward, the lower end of the main connecting rod 26 drives the upper guide pin 30 to move upward in the sliding hole 29. The upper guide pin 30 drives the force transmission cylinder 24, the lower motor cylinder 20, the wax scraper motor 21, the lower coupling 22, the lower protective sleeve 23, and the dewaxing shaft 9 to move upward. When the dewaxing shaft 9 moves upward, it drives the connecting plate 10 to move upward. When the connecting plate 10 moves upward, the lower guide pin 18 moves relative to the upper guide groove 17. The lower guide pin 18 drives the second end of the lower connecting arm 8 to swing upward. Finally, the first end of the lower connecting arm 8 drives the wax scraper 1 to retract into the lower swing hole 7. When the wear-resistant head 34 retracts into the upper swing hole 31, the value corresponding to the second displacement signal of the potentiometer 47 is the outer diameter of the push cylinder 28, indicating that the instrument push arm, dewaxing arm, and other instruments are retracted into place. The winch operator is notified to raise the cable at normal speed so that the instrument can be raised to the wellhead. When the upper part of the upper connecting pin 53 comes into contact with the inner side of the upper part of the upper sliding hole 52 as the nut 42 continues to move upward, it returns to the initial state. After that, the second displacement signal of the potentiometer 47 no longer changes, and the ground operator stops the push motor 44 through the ground control system.

[0061] Wellbore measurement: The push motor 44 starts, and the anchor arm 2 and wear-resistant head 34 open (the process is the same as the arm opening process). When the wear-resistant head 34 contacts the well wall, the first displacement signal generated by the potentiometer 47 under the action of the pressure ring 49 does not change significantly. When the push motor 44 continues to work, the screw nut 42 continues to move downward. At this time, the screw nut 42 drives the spring seat 40 to continue to move downward and compress the lower compression spring 50. The pressure of the screw nut 42 increases, which in turn causes the load of the push motor 44 to rise through the screw rod 43, that is, the current of the push motor 44 increases significantly. The first displacement signal corresponding to the significant increase in the current of the push motor 44 is taken as the well wall signal. By comparing the reading of the potentiometer 47 at this time with the ground scale value, the opening diameter of the wear-resistant head 34 can be calculated, reflecting the downhole wellbore value, thus realizing the wellbore measurement.

[0062] Adjustment of the clamping force between the wear-resistant head 34 and the well wall: When the wear-resistant head 34 contacts the well wall, the push motor 44 can continue to work. The push motor 44 continues to work until the current reaches the preset value. At this time, the screw nut 42 continues to move downward. At this time, the screw nut 42 drives the spring seat 40 to continue to move downward, compressing the lower compression spring 50. The lower compression spring 50 is compressed and generates an elastic force, turning off the push motor 44, and the screw nut 42 no longer moves. When the diameter of the well wall increases, there is a gap between the wear-resistant head 34 and the well wall. At this time, the upper end of the main connecting rod 26 moves downward under the action of the upper compression spring 71, the lower connecting pin 51 and the sliding hole 33, which causes the wear-resistant head 34 to open outward and abut against the well wall, which can make dewaxing possible in the section of the well wall with a larger diameter. Operation: When the well wall diameter decreases, the wear-resistant head 34 is squeezed by the well wall and retracts. Under the action of the sliding hole 33, the wear-resistant head 34 drives the upper end of the main connecting rod 26 to move upward. The upper end of the main connecting rod 26 further compresses the lower end of the upper compression spring 71 and drives the pressure ring 49 to move upward. When the pressure ring 49 moves upward, the moving end of the potentiometer 47 changes, generating a displacement. The displacement is transmitted as an electrical signal to the downhole electrical control assembly and finally uploaded to the surface control system. When the wear-resistant head 34 retracts into the upper swing hole 31, the load on the push motor 44 will increase as it continues to run, and the current of the push motor 44 will increase significantly. At this time, the reading of the potentiometer 47 is compared with the ground scale value to determine whether the anchor arm 2 and the wear-resistant head 34 have been retracted into place.

[0063] As attached Figure 7 , 8As shown, the balance short section includes a piston cylinder 60, a piston rod 61, an adapter 63, a second connecting plug 64, and a third connecting plug 65. The lower outer side of the piston cylinder 60 is sealed and fixedly installed on the inner side of the upper motor cylinder 45 above the upper mounting cylinder 57. The lower inner side of the piston cylinder 60 is fixedly installed with the second connecting plug 64, the lower end of which is tightly inserted into the first connecting plug 46. The lower inner side of the piston cylinder 60, corresponding to the position above the second connecting plug 64, is fixedly installed with an inner ring platform 66. The inner side of the inner ring platform 66 is sealed and passes through the hollow piston rod 61. The upper inner side of the piston cylinder 60, corresponding to the position below the inner ring platform 66, is fixedly installed with an anti-reverse nut 67 with a stepped surface on the upper inner side. The lower end of the piston rod 61 is in contact with the stepped surface. The upper outer side of the piston rod 61 is fixedly installed together with the lower inner side of the adapter 63. The lower outer side of the adapter 63 is sealed and fixedly installed together with the upper inner side of the piston cylinder 60. A third connector 65 is fixedly installed on the inner side of the end. The outer side of the adapter 63, corresponding to the position between the third connector 65 and the piston cylinder 60, is evenly distributed with pressure relief holes and oil injection holes that are connected internally and externally. Pressure relief valves 68 and sealing plugs 69 are installed in the pressure relief holes and oil injection holes, respectively. The outer side of the piston cylinder 60, corresponding to the position above the inner ring platform 66, is evenly distributed with several drain holes 70 that are connected internally and externally. A piston ring 62 is sealed between the inner side of the piston cylinder 60 and the outer side of the piston rod 61, corresponding to the position above the drain holes 70. An upper compression spring 71 is provided between the upper end of the piston ring 62 and the lower end of the adapter 63 and is fitted on the outer side of the piston rod 61. Several connecting holes 72 that are connected internally and externally are discretely distributed on the upper outer side of the piston rod 61, corresponding to the position of the upper compression spring 71. The inner side of the adapter 63, the inner side of the piston rod 61, the inner side of the anti-reverse nut 67, and the lower inner side of the piston cylinder 60 form a wire passage.

[0064] As required, existing known sludge scraper rings are installed between the lower outer side of piston ring 62 and the lower inner side of piston cylinder 60, and between the lower inner side of piston ring 62 and the outer side of piston rod 61, to remove well fluid that enters from the drain hole 70 and adheres to the outer side of piston rod 61. Existing known sealing rings are installed between the upper outer side of piston ring 62 and the upper inner side of piston cylinder 60, and between the upper inner side of piston ring 62 and the outer side of piston rod 61, to seal well fluid that enters the piston rod 61 through the drain hole 70, the gap between piston ring 62 and piston cylinder 60 and piston rod 61, and the connecting hole 72, thus preventing well fluid from affecting the insulation performance of the connecting cable. During use, remove the oil plug 16 in the first lubrication channel 13 and inject hydraulic oil into the first lubrication channel 13. The hydraulic oil flows through and fills the space between the lower protective sleeve 23 and the rotating power cylinder 19, between the lower protective sleeve 23 and the dewaxing shaft 9, between the rotating power cylinder 19 and the lower motor cylinder 20, the sliding hole 29, between the force transmission cylinder 24 and the main connecting rod 26, inside the main connecting rod 26, in the placement slot of the potentiometer 47, inside the spring seat 40, between the nut 42 and the upper motor cylinder 45, between the upper motor cylinder 45 and the upper mounting cylinder 57, between the first connecting plug 46 and the upper mounting cylinder 57, between the second connecting plug 64 and the piston cylinder 60, inside the piston rod 61, and inside the adapter 63 below the third connecting plug 65. The hydraulic oil flows into the telescopic cavity of the upper compression spring 71 through the connecting hole 72. When hydraulic oil at a certain pressure is injected, the hydraulic oil acts on the upper end of piston ring 62, causing piston ring 62 to move downwards. This causes the upper compression spring 71 to extend and possess a certain elastic potential energy. When the wear-resistant head 34 opens, the main connecting rod 26 moves downwards. At this time, after the spring seat 40 compresses the lower compression spring 50, there is extra space. Since the upper compression spring 71 has elastic potential energy for movement, the upper compression spring 71 contracts and fills the extra space with hydraulic oil, thus playing the role of storing and regulating hydraulic oil. As the working depth increases, the downhole pressure gradually increases. After the well fluid flows into the piston cylinder 60 through the drain hole 70, it acts on the lower end of piston ring 62. The well fluid pressure and the hydraulic oil pressure act on piston ring 62. When the two pressures are balanced, piston ring 62 stops moving. At this time, the hydraulic balance part plays the role of pressure balance.

[0065] When the downhole temperature rises, the hydraulic oil temperature also rises. If the well pressure has a greater impact on the hydraulic oil than the well temperature, the expansion of the hydraulic oil due to the increased temperature will cause the piston ring 62 to move downwards. When the hydraulic oil pressure matches the well pressure, the piston ring 62 stops moving, making the internal pressure of the instrument match the well fluid pressure. When the hydraulic oil pressure exceeds the set value, the pressure is reduced through the pressure relief valve 68 until it matches the well fluid pressure. Similarly, when the downhole temperature decreases, the hydraulic oil temperature also decreases. If the well pressure has a greater impact on the hydraulic oil than the well temperature, the hydraulic oil volume decreases as the temperature drops, resulting in lower hydraulic oil pressure. The well fluid will then cause the piston ring 62 to move downwards, making the internal pressure of the instrument match the well fluid pressure. At this time, the hydraulic balance section plays a role in pressure balancing.

[0066] As attached Figures 3 to 6 As shown, the downhole electrical control assembly includes a circuit cylinder 73, a circuit frame 74, a processing module 75, and a control module 76. The lower inner side of the circuit cylinder 73 is sealed and fixedly connected to the upper outer side of the adapter 63. The lower inner side of the circuit cylinder 73 is sealed with a connecting plug 77 whose upper end is fixedly installed together with the middle of the third connecting plug 65. The circuit frame 74, whose lower end is fixedly installed together with the upper end of the third connecting plug 65, is located inside the circuit cylinder 73 at the position corresponding to the upper side of the connecting plug 77. Several support rings 78 are arranged vertically and vertically on the outer side of the circuit frame 74. The processing module 75 and the control module 76 are arranged at intervals on the circuit frame 74. The upper end of the circuit frame 74 is provided with an insulating hole that runs vertically through it. An insulating plug 79 is sealed and fixedly installed inside the insulating hole. The output end of the potentiometer 47 is electrically connected to the input end of the processing module 75. The output end of the control module 76 is electrically connected to the input end of the push motor 44 and the input end of the dewaxing motor, respectively.

[0067] According to the requirements, the first connecting pin 86, the second connecting pin 86, and the third connecting pin 86 are all existing known technologies, such as a 19-pin plug or a 19-pin socket. The support ring 78 is integrated with the circuit frame 74. The outer ring surface of the support ring 78 and the inner side of the circuit tube 73 are close to each other to provide support, so that the circuit frame 74 can be fitted into the circuit tube 73. During use, the output end of potentiometer 47, the input end of push motor 44, and the input end of dewaxing motor are electrically connected to the lower end of first connector 46 via a first connecting cable passing through the lower filling space of hydraulic oil. The upper end of first connector 46 is electrically connected to the lower end of second connector 64 via a second connecting cable passing through the upper filling space of hydraulic oil. The upper part of second connector is electrically connected to the lower part of third connector. The upper end of third connector 65 is electrically connected to the corresponding positions of processing module 75 and control module 76 via a third connecting cable located in circuit cylinder 73. This facilitates the conversion of signals collected by potentiometer 47 into signals that are easy to upload to the ground control system. Operators can control dewaxing motor and push motor 44, as well as the lifting operation of this invention, according to the signals.

[0068] As attached Figure 2As shown, the upper connection assembly includes an upper connector 80, a pin pressure plate 81, a fourth connecting plug 82, an insulating sleeve 84, a connecting sleeve 85, and a connecting pin 86. The inner side of the circuit tube 73 at the upper end of the circuit frame 74 is sealed and fixedly installed with the lower outer side of the upper connector 80. The pin pressure plate 81 is fixedly installed at the upper end of the upper connector 80. The upper inner side of the upper connector 80 is sealed and installed with the fourth connecting plug 82, which passes through the pin pressure plate 81 and is located above the pin pressure plate 81. The lower outer side of the fourth connecting plug 82 is tightly fitted. There is a fifth connector 83. An insulating sleeve 84 is fitted between the inner side of the upper connector 80 and the outer side of the fifth connector 83. A connecting sleeve 85 is installed on the inner side of the upper part of the insulating sleeve 84, which is tightly fitted on the outer side of the lower part of the fifth connector 83. A retaining ring 87 is installed in the upper connector 80 at the lower end of the insulating sleeve 84. A connecting pin 86 is provided in the retaining ring 87, which is tightly fitted on the lower end of the insulating plug 79. An elastic reset member 88 is installed in the insulating sleeve 84 at the position between the upper end of the connecting pin 86 and the lower end of the connecting sleeve 85.

[0069] According to the requirements, the elastic reset component 88 is a known technology. The fourth connecting pin 86, the fifth connecting pin 86, and the connecting pin 86 are all known technologies, such as a 19-pin plug or a 19-pin socket. The lower end of the insulating plug 79 is electrically connected to the corresponding positions of the processing module 75 and the control module 76 through the fourth connecting cable located in the circuit tube 73, so as to transmit the data information collected by the potentiometer 47 upward and the control signals of the push motor 44 and the wax scraper motor 21 downward. The fifth connecting cable is connected between the upper end of the connecting pin 86 and the connecting sleeve 85. The lower end of the upper connector 80 is provided with a grounding hole, and the grounding pin, whose lower end is fixedly installed together with the upper end of the circuit frame 74, is tightly fitted in the grounding hole. During use, this design allows for the sealing of the upper end of the circuit cylinder 73, ensuring that the circuit frame 74 is sealed within the circuit cylinder 73. This prevents well fluid from entering and damaging the acquisition module. It also facilitates the connection of the invention with the logging cable. By incorporating the connecting sleeve 85, connecting pin 86, and elastic reset component, when the logging cable is lifted and the fourth connecting plug 82 is subjected to excessive force, the connecting sleeve 85 separates from the fifth connecting plug 83, thus better protecting the invention.

[0070] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A dual motor cluster dewaxing apparatus characterized by The system comprises, from top to bottom, an upper connecting assembly, a downhole electrical control assembly, a balance sub, a push assembly, an anchoring assembly, a rotating assembly, and a dewaxing assembly. The dewaxing assembly has several scraper groups spaced circumferentially, each including at least one scraper blade spaced spirally for scraping wax deposits on the wellbore. The rotating assembly drives the scraper blades on the dewaxing assembly to rotate. The anchoring assembly has several anchoring arms spaced circumferentially for abutting against the wellbore. The push assembly drives the lower ends of the anchoring arms to open or retract synchronously, and simultaneously drives the lower ends of the scraper blades to open or retract synchronously. The balance sub contains piston rings for balancing hydraulic pressure in the wellbore. The downhole electrical control assembly transmits control signals to the push assembly and rotating assembly and collects operational data from them. The upper connecting assembly connects to the logging cable, enabling the downhole electrical control assembly to communicate with the surface control system. The dewaxing assembly includes a base cone, a dewaxing shaft, a lower connecting arm, a connecting plate, a suspension connecting pipe, and a rotating base. The lower end of the base cone is a downwardly convex spherical surface. The base cone has a stepped mounting groove running vertically through it. The upper outer side of the base cone has evenly spaced strip-shaped downward swing holes corresponding to the wax scraper and communicating with the mounting groove. Each downward swing hole has an L-shaped lower connecting arm hinged to it. The first end of the lower connecting arm is detachably and fixedly mounted to the upper part of the wax scraper. The mounting groove contains a dewaxing shaft with its upper end positioned above the base cone. A connecting plate corresponding to the scraper assembly is fixedly mounted on the lower outer side of the dewaxing shaft. The outer side of the connecting plate connects to the second end of the corresponding lower connecting arm. The connecting plate moves up and down... The lower end of the wax scraper can retract or open synchronously. Above the bottom cone, there is a tubular rotating seat that is sealed and fitted to the outer side of the lower part of the dewaxing shaft. The outer side of the lower part of the rotating seat is provided with a rotating annular groove. A tubular suspension connecting pipe can be detachably installed in the rotating annular groove. The lower end of the suspension connecting pipe is fixedly installed together with the corresponding position of the upper end of the bottom cone. The upper part of the rotating seat has a first lubrication channel and a second lubrication channel that both extend to the outer side of the lower part of the rotating seat at intervals. A one-way valve is installed at the upper end of the first lubrication channel. An oil filling plug is sealed and fixedly installed at the lower end of both the first lubrication channel and the lower end of the second lubrication channel. The outer side of the upper part of the rotating seat and the upper part of the dewaxing shaft are respectively connected to the corresponding position of the lower part of the rotating assembly. The second end of the lower connecting arm is provided with a U-shaped upper guide groove, and the upper end of the connecting plate is provided with a lower guide groove corresponding to the second end of the lower connecting arm. Each lower guide groove is equipped with a lower guide pin located in the corresponding upper guide groove. The lower part of the wax scraper is provided with an outward-opening wax discharge groove on the side away from the wax removal shaft. The lower end of the wax scraper is fixed with a wax removal blade, and the blade of the wax removal blade has several broken notches distributed at intervals.

2. The dual-motor sleeve dewaxing device according to claim 1, characterized in that, The rotating assembly includes a rotating power cylinder, a lower motor cylinder, a wax scraper motor, a lower coupling, a lower protective sleeve, and a force transmission cylinder. The lower end of the rotating power cylinder is sealed and fixedly connected to the upper outer side of the rotating seat. The lower motor cylinder is fitted inside the upper part of the rotating power cylinder. The wax scraper motor is fixedly installed inside the lower motor cylinder. The lower end of the wax scraper motor has an output shaft. The lower end of the output shaft is connected to the upper end of the wax removal shaft through the lower coupling. The lower protective sleeve is fitted outside the lower coupling, and its upper end is fixedly installed together with the lower end of the wax scraper motor. The lower part of the lower protective sleeve is rotatably installed on the outside of the wax removal shaft above the rotating seat. The force transmission cylinder is detachably fixedly installed on the upper inner side of the lower motor cylinder corresponding to the upper position of the wax scraper motor. The upper inner side of the rotating power cylinder and the upper end of the force transmission cylinder are respectively connected to the corresponding positions of the lower part of the anchoring assembly.

3. The dual-motor sleeve dewaxing device according to claim 2, characterized in that, The anchoring assembly includes a lower transition joint, a main connecting rod, an upper connecting arm, and a push-back cylinder. The lower outer side of the lower transition joint is sealed and fixedly connected to the inner side of the upper end of the rotating power cylinder above the force transmission cylinder. The lower transition joint is sealed with a main connecting rod whose lower end is fitted onto the inner side of the upper end of the force transmission cylinder. The main connecting rod has a hollow structure. The lower outer side of the lower transition joint, corresponding to the lower position of the force transmission cylinder, has several radially penetrating strip-shaped sliding holes evenly distributed along the circumference. The upper outer side of the force transmission cylinder has a first positioning hole that corresponds to the sliding holes and is radially penetrating. The outer side of the main connecting rod corresponding to each first positioning hole has a first positioning screw hole. Each sliding hole has a first positioning screw hole whose end passes through the first positioning hole and is screwed to the corresponding position. The upper guide pin inside the screw hole is fixedly connected to the upper outer side of the lower transition joint and the lower inner side of the push cylinder. The lower outer side of the push cylinder has strip-shaped upper swing holes that are evenly distributed around the circumference and correspond to the anchoring arm and are open inside and out. The upper part of the anchoring arm is hinged to the upper part of the upper swing hole. The upper outer side of the main connecting rod corresponding to the position of the upper swing hole is provided with a connecting ring groove. Each anchoring arm is connected to the upper end of the connecting ring groove with a Z-shaped upper connecting arm. The upper outer side of the main connecting rod has several strip-shaped lower sliding holes that are open inside and out. The inner side of the main connecting rod below the lower sliding hole has a lower limiting cone surface that is larger at the top and smaller at the bottom. The upper part of the main connecting rod and the upper end of the push cylinder are respectively connected to the corresponding positions of the lower part of the push assembly.

4. The dual-motor sleeve dewaxing device according to claim 3, characterized in that, The lower part of the anchoring arm is detachably equipped with a wear-resistant head located inside the lower part of the upper swing hole. The lower end of the wear-resistant head has an outwardly protruding arc surface on the side away from the main connecting rod. The upper inner part of the upper swing hole is provided with a lower anchoring pin. The first end of the upper connecting arm is rotatably installed together with the lower anchoring pin. The lower side of the first end of the upper connecting arm is fixedly installed together with the upper side of the corresponding anchoring arm. A vertical connecting plate is fixed on the bottom wall of the connecting ring groove corresponding to the position between two adjacent anchoring arms. The second end of the upper connecting arm is provided with a U-shaped hinge groove. The hinge groove is provided with an upper anchoring pin fixedly installed together with the corresponding position of the connecting plate. A limiting plate matching the inclined section of the upper connecting arm is fixed between each pair of adjacent connecting plates.

5. The dual-motor sleeve dewaxing device according to claim 3 or 4, characterized in that, The push assembly includes an upper transition joint, a spring seat, a screw nut, a screw rod, a push motor, an upper motor barrel, an upper coupling, a first connecting plug, and a potentiometer. The upper end of the push barrel is fixedly connected to the lower end of the upper transition joint, which is sealed and fitted onto the outer side of the upper part of the main connecting rod. The outer side of the upper end of the upper transition joint is sealed and fixedly connected to the inner side of the lower end of the upper motor barrel. A tubular spring seat with its upper end located above the main connecting rod is fitted onto the inner side of the upper end of the main connecting rod. An outer ring platform is fixed to the outer side of the upper end of the spring seat. The outer side of the lower end of the spring seat has an upper limit cone surface that matches the lower limit cone surface. A tubular screw nut is fitted between the outer side of the spring seat and the inner side of the upper transition joint. The inner side of the upper part of the screw nut has an upper limit step that matches the outer ring platform. A screw nut is installed between the inner side of the screw nut at the upper end of the main connecting rod and the spring seat. A pressure ring is provided, with a lower compression spring fitted on the outside of the spring seat between the upper end of the pressure ring and the lower end of the outer ring platform. A lower connecting pin is fixedly installed on the lower part of the nut, corresponding to the sliding hole and capable of moving up and down within the sliding hole. At least one internally and externally communicating lower wire-passing hole is provided on the outer side of the nut at intervals along the circumference corresponding to the position above the upper limit step. A placement groove is provided on the inner side of the upper transition joint corresponding to the position above the main connecting rod. A placement hole is provided on the outer side of the nut corresponding to the placement groove, and a potentiometer is installed in the placement groove. The lower part of the moving end of the potentiometer is fixedly installed together with the pressure ring. A lead screw with a gap between its lower end and the upper end of the outer ring platform is screwed to the inner side of the upper end of the nut. Several radial through-holes are distributed at intervals along the outer circumference of the upper transition joint corresponding to the position above the lower wire-passing hole. The upper sliding hole is a continuous strip. Each upper sliding hole has an upper connecting pin that is fixedly installed with the upper part of the screw nut. The outer side of the upper transition joint corresponding to the lower threading hole position has an external threading hole that communicates with the inside and outside. The upper outer side of the upper transition joint above the upper sliding hole has a threading ring groove. The lower side wall of the threading ring groove has right threading holes and left threading holes that communicate with the external threading hole and the placement groove, respectively. The upper end of the upper transition joint has at least one upper threading hole whose lower end communicates with the threading ring groove. The middle outer side of the screw has an upper shaft seat whose lower end is fixedly installed with the upper part of the upper transition joint. The lower end of the upper shaft seat corresponding to each upper threading hole position has a transition threading hole that is connected vertically. The upper inner side of the upper motor barrel above the upper shaft seat has a threading ring groove. An upper mounting cylinder is fixedly installed, and a push motor is fixedly installed inside the upper mounting cylinder. The lower end of the push motor has a drive shaft, and the lower end of the drive shaft is connected to the upper end of the lead screw through an upper coupling. An upper protective sleeve is fitted on the outside of the upper coupling, with its upper and lower ends fixedly installed together with the lower end of the push motor and the upper end of the upper shaft seat, respectively. A first connecting plug is fixedly installed on the inner side of the upper end of the upper mounting cylinder. An inner wire hole with internal and external communication is provided on the outer side of the upper mounting cylinder corresponding to the position between the first connecting plug and the push motor. A strip-shaped wire groove with its upper end communicating with the inner wire hole is provided on the lower end of the upper mounting cylinder. The upper end of the upper motor cylinder is sealed and fixedly connected to the lower end of the balance short section. The balance short section has a wire channel for threading cables connecting the lower drive motor, the push motor, the potentiometer, and the downhole electrical control assembly.

6. The dual-motor bushing dewaxing device according to claim 5, characterized in that, The balance short section includes a piston cylinder, piston rod, adapter, second connector, and third connector. The lower outer side of the piston cylinder is sealed and fixedly installed on the inner side of the upper motor cylinder above the upper mounting cylinder. The lower inner side of the piston cylinder is fixedly installed with the second connector, the lower end of which is tightly inserted into the first connector. An inner ring platform is fixedly installed on the lower inner side of the piston cylinder corresponding to the position above the second connector. A hollow piston rod is sealed and passed through the inner side of the inner ring platform. An anti-reverse nut with a stepped surface on the upper inner side is fixedly installed on the inner side of the piston cylinder corresponding to the lower end of the inner ring platform. The lower end of the piston rod contacts the stepped surface. The upper outer side of the piston rod is fixedly installed together with the lower inner side of the adapter. The lower outer side of the adapter is sealed and fixedly installed together with the upper inner side of the piston cylinder. The upper inner side of the adapter... A third connector is fixedly installed in a sealed manner. Around the outer side of the adapter corresponding to the position between the third connector and the piston cylinder, there are pressure relief holes and oil injection holes that are interconnected internally and externally. Pressure relief valves and sealing plugs are installed in the pressure relief holes and oil injection holes, respectively. Around the outer side of the piston cylinder corresponding to the position above the inner ring platform, there are several drain holes that are interconnected internally and externally. A piston ring is sealed between the inner side of the piston cylinder and the outer side of the piston rod above the drain holes. An upper compression spring is fitted onto the outer side of the piston rod between the upper end of the piston ring and the lower end of the adapter. Around the upper outer side of the piston rod corresponding to the position of the upper compression spring, there are several interconnecting holes that are interconnected internally and externally. A wire passage is formed between the inner side of the adapter, the inner side of the piston rod, the inner side of the anti-reverse nut, and the lower inner side of the piston cylinder.

7. The dual-motor bushing dewaxing device according to claim 6, characterized in that, The downhole electrical control assembly includes a circuit cylinder, a circuit frame, a processing module, and a control module. The lower inner side of the circuit cylinder is sealed and fixedly connected to the upper outer side of the adapter. The lower inner side of the circuit cylinder is sealed with a connecting plug whose upper end is fixedly installed together with the middle of the third connecting plug. The circuit cylinder above the connecting plug has a circuit frame whose lower end is fixedly installed together with the upper end of the third connecting plug. Several support rings are arranged vertically at intervals on the outer side of the circuit frame. The processing module and the control module are arranged at intervals on the circuit frame. The upper end of the circuit frame has an insulating hole that runs vertically through it. An insulating plug is sealed and fixedly installed in the insulating hole. The output end of the potentiometer is electrically connected to the input end of the processing module. The output end of the control module is electrically connected to the input end of the push motor and the input end of the dewaxing motor, respectively.

8. The dual-motor bushing dewaxing device according to claim 7, characterized in that, The upper connection assembly includes an upper connector, a pin pressure plate, a fourth connecting plug, an insulating sleeve, a connecting sleeve, and a connecting pin. The inner side of the circuit tube at the upper end of the circuit frame is sealed and fixedly installed with the outer side of the lower part of the upper connector. The pin pressure plate is fixedly installed at the upper end of the upper connector. The fourth connecting plug, which passes through the pin pressure plate and is located above the pin pressure plate, is sealed and installed on the inner side of the upper part of the upper connector. The fifth connecting plug is tightly fitted on the outer side of the lower part of the fourth connecting plug. An insulating sleeve is fitted between the inner side of the upper connector and the outer side of the fifth connecting plug. The connecting sleeve, which is tightly fitted on the outer side of the lower part of the fifth connecting plug, is installed on the inner side of the upper part of the insulating sleeve. A retaining ring is installed in the upper connector at the lower end of the insulating sleeve. The connecting pin, which is tightly fitted on the inner side of the retaining ring, is installed in the insulating sleeve at the lower end of the connecting sleeve. An elastic reset element is installed in the insulating sleeve at the position between the upper end of the connecting pin and the lower end of the connecting sleeve.

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