A type of well repair machine

Abstract

This invention discloses a workover rig, primarily relating to the field of workover operation technology. It includes a derrick and a second-level platform. An installation frame is located within the second-level platform, with a mounting base fixed at the far center of the frame. A robotic arm for gripping the tubing is mounted on the bottom of the mounting base. A cleaning module and a detection module are located at the end of the mounting base near the derrick. A buffer module is located on one or both sides of the installation frame. The cleaning module includes a cleaning ball and a second head. The cleaning ball comprises one or more overlapping air bladders, the maximum diameter of which corresponds to the inner diameter of the tubing. The second head is used to pressurize the top of the tubing filled with the cleaning ball. The detection module employs an eddy current detection device, including an extension cable and a probe. The probe has a vertical reciprocating stroke based on the extension cable's retraction and retraction. The buffer module is used to temporarily store tubing that passes the inspection. The beneficial effects of this invention are: it enables on-site inspection of tubing, and qualified tubing can be directly reused.

Description

Technical Field

[0001] This invention relates to the field of well workover technology, specifically a well workover machine. Background Technology

[0002] Regular maintenance of oilfield tubing is a crucial task in oilfield operations, ensuring normal well production and improving efficiency. Workover rigs are specialized machines used for oil well repair. During operations, they sequentially pull out existing tubing, install new tubing, and lower it in, thereby maintaining the oil production tubing.

[0003] Modern well workover rigs are increasingly achieving fully automated operations, with complete mechanization in everything from tubing installation and removal to tubing loading and unloading. Replaced tubing is uniformly sent to the plant for cleaning and inspection. Once the tubing is found to be free of cracks, holes, or other defects, it is sorted and packaged, ready for reuse in the next well workover operation. This inspection and screening process involves repeated transportation, feeding, treatment, loading and unloading (at the inspection station), and packaging, making it complex, time-consuming, and labor-intensive—a relatively demanding aspect of tubing maintenance. Summary of the Invention

[0004] The purpose of this invention is to provide a workover rig that can perform on-site inspection of tubing, and qualified tubing can be directly reused, simplifying the traditional workover operation process.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A well workover rig includes a derrick loaded on a vehicle body, a two-tiered platform mounted on the derrick, an installation frame provided within the two-tiered platform, an installation platform fixed in the center of the side of the installation frame furthest from the derrick, a robotic arm for gripping tubing mounted at the bottom of the installation platform, a cleaning module and a detection module provided at the end of the installation platform near the derrick, and a buffer module provided on one or both sides of the installation frame.

[0007] The cleaning module includes a cleaning ball and a second head. The cleaning ball includes one or more overlapping air bladders, the maximum diameter of which corresponds to the inner diameter of the oil pipe. The second head is provided with a lifting rod that can be raised and lowered. The bottom end of the lifting rod is provided with a plug cap that cooperates with the oil pipe opening. An inflation pipe is installed on the plug cap. The bottom of the inflation pipe is provided with an inflation hole located within the range of the oil pipe opening. The inflation pipe is connected to an air source for inflating the top of the sealed oil pipe.

[0008] The detection module uses an eddy current detection device, including an extension cable and a probe. The probe has a vertical reciprocating stroke based on the extension cable's winding and unwinding.

[0009] The cache module is used to temporarily store oil pipes that have passed the inspection.

[0010] The extension cable is wound on a motor-controlled spool. The probe is located inside the insertion tube, which is fixed relative to the mounting platform. The outer diameter of the insertion tube is adapted to the inner diameter of the oil pipe opening. A retaining ring is provided at the top of the insertion tube, and the inner tube of the retaining ring is used to pass through the extension cable.

[0011] The bottom surface of the plug is provided with a cavity corresponding to the top diameter of the oil pipe. An airbag plug is provided in the center of the bottom surface of the cavity. The airbag plug is a multi-layered airbag plug with an accordion pleated structure. The airbag plug is adapted to the top inner diameter of the oil pipe. The inflation tube passes through the airbag plug in the center and exposes the inflation hole below the airbag plug.

[0012] The cleaning module also includes a first machine head mounted on the mounting platform. The first machine head has a loading rod at one end near the derrick. The bottom end of the loading rod has a telescopic pin, which is movably connected to a first pin hole. The first machine head has a second lifting stroke and a rotating stroke relative to the mounting platform. Based on the rotating stroke, the loading rod of the first machine head has a feeding position and a loading position. The rotation stroke enables the loading rod of the first machine head to switch between the two positions.

[0013] The loading rod is mounted in a manner that allows it to rotate relative to the first machine head under motor control.

[0014] A flexible water pipe is provided on one side of the loading rod, and an injection port is provided at the bottom end of the flexible water pipe. An electrically controlled valve is installed on the flexible water pipe or the injection port, and the flexible water pipe is connected to a water source or a cleaning liquid source.

[0015] The cleaning module also includes a recovery box located below the second head. The recovery box is an open container with a strip plate fixed to the bottom. The strip plate is provided with a telescopic guide rail and a telescopic rack. A telescopic slider is fitted on the telescopic guide rail. An installation arm with a flipping stroke is also installed on the derrick. A positioning platform is provided at the end of the installation arm away from the derrick. The telescopic slider is fixed on the positioning platform. A telescopic gear that meshes with the telescopic rack is rotatably installed below the positioning platform.

[0016] The cleaning ball includes a balloon body, which includes a skeleton. The skeleton includes an upper circular plate, several ring plates, and a lower circular plate that are aligned and overlapped vertically. The outer diameters of the upper circular plate, ring plates, and lower circular plates correspond to each other and are all connected by a ring array of bone rods. The airbag is disposed between the circular plate and the first ring plate, between adjacent ring plates, and between the last ring plate and the lower circular plate. A circular tube-shaped interface tube is provided in the center of the top surface of the upper circular plate, and a symmetrical first pin hole is provided on the side wall of the interface tube.

[0017] The cleaning balls include No. 1 cleaning ball, No. 2 cleaning ball, and No. 3 cleaning ball, and the order in which they are placed in the oil pipe from top to bottom is No. 1 cleaning ball, No. 2 cleaning ball, and No. 3 cleaning ball;

[0018] The bottom end of the No. 3 cleaning ball is provided with a docking block that can be movably inserted into the interface tube.

[0019] A vertical rod is rotatably mounted on the lower disc of the No. 2 cleaning ball. A connecting block is also provided at the bottom end of the vertical rod. A spiral blade is fixed on the vertical rod. The spiral blade is a flexible rubber sheet. The spiral blade is an inclined blade with a downward-extending cross section. The outer side of the spiral blade is provided with an upward-folded edge. The folded edge has an upward angle of no more than 15 degrees relative to the horizontal plane. The folded edge of the spiral blade is in contact with the wall of the oil pipe.

[0020] A vertical shaft is rotatably mounted on the lower disc of the No. 1 cleaning ball. A docking block is also provided at the bottom end of the vertical shaft, and stirring blades are provided at the bottom of the vertical shaft.

[0021] It also includes a material supply module located on one side of the mounting frame, the material supply module including a hanging mechanism, a feeding mechanism, and multiple independent material preparation pipes;

[0022] The material preparation tube is a straight-extending tubular material rack. Symmetrical strip-shaped holes, adapted to its length, are opened on both sides of the tube. A positioning port is located at the top of the tube. Finned plates are fixed opposite each other on the side walls of the tube. Each finned plate has a gripper and a hanging plate. The gripper works in conjunction with a robotic arm. The hanging plate has two hanging sleeves and two second pin holes.

[0023] The material hanging mechanism includes at least two rows of material hanging racks, each rack including upper and lower hanging rods, and the hanging sleeve is movably connected to the hanging rod;

[0024] The feeding mechanism includes an inner arc-shaped positioning groove, the arc surface of which is adapted to the circumference of the material preparation tube, and the positioning groove is coaxially aligned with the loading rod located at the feeding position. A slot is provided in the center of the positioning groove, and the slot is movably inserted into the hanging plate. Two positioning pins are provided on the side wall of the slot, and the positioning pins are movably connected to the second pin hole. Stretch frames are symmetrically provided on both sides of the positioning groove. Each stretch frame is provided with a synchronously lifting material lifting slide. A support rod is installed on the lifting slide. The two support rods are coaxially arranged and have a counter-linear telescopic stroke. Based on this telescopic stroke, the inner ends of the two support rods can move closer or further apart. The inner end of the support rod is provided with a support block. When the support rod is retracted into the electric push cylinder, the distance between the two support blocks is greater than the diameter of the airbag. When the support rod is extended out of the electric push cylinder, the distance between the two support blocks is less than the diameter of the lower disc. When the material preparation tube is positioned and fixed in the positioning groove, the bottom end of the stretch frame is adapted to the bottom end of the material preparation tube.

[0025] The derrick includes an upper derrick and a lower derrick that are telescopically connected. The second platform includes a rectangular frame body. One end of the frame body is hinged to the lower part of the upper derrick, so that the second platform has a 90-degree rotation stroke relative to the upper derrick from retraction to expansion. The mounting frame has a first lifting stroke relative to the frame body, and the first lifting stroke is perpendicular to the plane where the frame body is located.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] This workover rig can perform on-site inspection of the lifted tubing. Qualified tubing can be reused directly without having to be sent to the workshop for cleaning and testing, thus greatly saving time and effort in the workover process, making the workover operation more efficient, significantly reducing operating costs, and possessing significant economic and promotional value. Attached Figure Description

[0028] Figure 1 This is a partial schematic diagram of the derrick of the present invention with a two-tiered platform installed.

[0029] Figure 2 This is a schematic diagram of the two-tiered platform portion of the present invention (with the surrounding panels omitted).

[0030] Figure 3 This is the present invention. Figure 2 Top view.

[0031] Figure 4 This is a schematic diagram of the split structure of the two-layer platform of the present invention.

[0032] Figure 5 This is a structural schematic diagram of the mounting frame and its loading components of the present invention (the material preparation tube is in the positioning groove).

[0033] Figure 6 This is a structural schematic diagram of the mounting frame and its loading components of the present invention (the material preparation tube is in the positioning groove).

[0034] Figure 7 This is a schematic diagram of the structure on the mounting frame of the present invention.

[0035] Figure 8 This is a schematic diagram of the internal structure of the bottom of the travel frame of the present invention (in conjunction with the material preparation tube).

[0036] Figure 9 This is a schematic diagram of the material preparation tube of the present invention fully loaded with cleaning balls.

[0037] Figure 10 This is the present invention. Figure 9 A close-up view of the top section.

[0038] Figure 11 This is the present invention. Figure 9 A close-up view of the bottom section.

[0039] Figure 12 This is a schematic diagram of the material preparation pipe of the present invention under no-load conditions.

[0040] Figure 13 This is a schematic diagram of the oil pipe and cleaning ball of the present invention.

[0041] Figure 14 This is a schematic diagram of the structure of the cleaning ball of the present invention.

[0042] Figure 15 This is a schematic diagram of the structure of the recycling bin of the present invention.

[0043] Figure 16 This is the present invention. Figure 3 A magnified view of part A.

[0044] Figure 17 This is the present invention. Figure 8 A schematic diagram of the state when not in conjunction with the material preparation pipe.

[0045] The labels shown in the attached diagram:

[0046] 1. Derrick; 2. Main frame; 3. Equipment plate; 4. Lifting rail; 5. Lifting rack; 6. Inner sliding plate; 7. Mounting frame; 8. Vertical plate; 9. Mounting platform; 10. Robotic arm; 11. Balloon body; 12. Upper circular plate; 13. Ring plate; 14. Lower circular plate; 15. Rib; 16. Airbag; 17. Interface pipe; 18. First pin hole; 19. Connecting block; 20. Vertical rod; 21. Spiral blade; 22. Vertical shaft; 23. Mixing blade; 24. First machine head; 25. Rotating disk; 26. Support column; 27. Lifting cylinder; 28. Filling rod; 29. ​​Telescopic pin; 30. Fixing clamp; 31. Flexible water pipe; 32. Second machine head; 33. Lifting cylinder; 34. Lifting rod; 35. Plug cap; 36. Airbag plug; 37. Inflation pipe; 38. Recovery box 39. Strip plate; 40. Telescopic guide rail; 41. Telescopic rack; 42. Mounting arm; 43. Positioning platform; 44. Extension cable; 46. Insert pipe; 47. Equipment box; 48. Positioning pulley block; 49. Guide pulley block; 50. Stop ring; 51. Material preparation pipe; 52. Strip hole; 53. Fin plate; 54. Pipe gripper; 55. Hanging plate; 56. Hanging sleeve; 57. Second pin hole; 58. Support sleeve; 59. Material hanging rod; 60. Stop column; 61. Fixing plate; 62. Smooth rod; 63. I-beam frame; 64. Lock cap; 65. Machine position plate; 66. Positioning groove; 67. Slot; 68. Positioning pin; 69. Travel frame; 70. Lifting guide rail; 71. Lead screw; 72. Lifting slide; 73. Electric pusher cylinder; 74. Support rod; 75. Support block; 76. Oil pipe rack. Detailed Implementation

[0047] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0048] The main structure of the workover rig includes:

[0049] Vehicle Body: The vehicle body includes the chassis and drive system. The chassis provides the basic load-bearing capacity for the entire vehicle, supporting its weight and workload. Regarding the drive system, well workover trucks typically employ four-wheel drive to adapt to the complex outdoor environment of oilfields. The drive system includes common operational vehicle drive mechanisms such as the engine, transmission system, steering system, and braking system.

[0050] Transmission system: Used to transmit power to various devices, including transfer cases, angle transmission cases, turntable transmission cases, chain cases, drive shafts, clutches, etc.

[0051] Base system: Used to support the entire device, extending and supporting it at the target location.

[0052] Control system: including hydraulic control, pneumatic control, electrical control, lighting, etc.

[0053] Rotary system: Provides torsional force to drive downhole tools to rotate, including rotary tables, swivels, downhole tools, drill bits, etc.

[0054] Lifting System: A lifting system is installed on the workover vehicle for lifting and transporting tubing at the wellhead to facilitate tubing replacement. The lifting system mainly includes the derrick 1, winch system, wire rope, overhead crane, traveling block hook, and tension rope.

[0055] The above structure represents the basic components of a common well workover rig.

[0056] During well workover operations, the derrick 1 is erected and lowered using two lifting hydraulic cylinders installed between its bottom and the vehicle body. Based on the power and support of the lifting hydraulic cylinders, it can also be supported by a tension rope mechanism to achieve upright operation. The overhead crane is a fixed pulley block structure installed at the top of the derrick 1, typically using 3-8 pulleys installed side-by-side, connected to the winch and traveling block via wire ropes to share the hook load.

[0057] The travel trolley hook is a movable pulley structure. The hook is used to suspend the lifting device, which is used to lift the oil pipe.

[0058] The derrick 1 includes a lower derrick and an upper derrick that are telescopically connected. When the upper derrick is in operation, it extends outward and the bottom of the upper derrick locks with the top of the lower derrick to complete the deployment operation.

[0059] The lower part of the upper derrick is provided with a second-level platform that can be rotated relative to it. The second-level platform is a U-shaped metal structure operating platform. After the upper derrick is extended and fixed, the second-level platform opens and rotates to a horizontal state, thereby assisting in automated well workover operations.

[0060] The second platform is hinged to the upper derrick at one end near the upper derrick. The opening of the second platform can be powered by a support hydraulic cylinder or other power mechanisms to achieve a 90-degree rotation stroke from retraction to unfolding.

[0061] The second-level platform includes a rectangular frame body 2. The end of the frame body 2 closest to the upper derrick is provided with a hinge joint that is hinged to the upper derrick, which is defined as the near end. The end of the frame body 2 furthest from the upper derrick is defined as the far end.

[0062] The frame body 2 is fixed with a surrounding panel, which is used to shield and protect the internal structure. The frame body 2 is provided with an equipment plate 3 on one side of the far end. The equipment plate 3 is convenient for maintenance and facilitates the installation of loads on other equipment components.

[0063] The frame body 2 has an internal mounting frame 7 in a horizontally unfolded state with a first lifting stroke. The mounting frame 7 is a U-shaped frame, and has an opening at one end near the upper derrick for easy folding. Two symmetrical upright plates 8 are provided on the outer side of the mounting frame 7. Each upright plate 8 has two lifting tracks 4 extending vertically relative to the plane of the mounting frame 7, achieving stable control of the first lifting stroke. This is not limited to this example; 3-6 upright plates 8 and lifting tracks 4 can also be used to achieve multi-track constraint of the first lifting stroke. A lifting rack 5 is also fixed on the upright plate 8 between two lifting rails 4. The lifting rack 5 is arranged in parallel with the lifting rails 4. Inner slide plates 6 are provided on both sides of the frame body 2, or on both sides and the rear side. Lifting sliders that slide and engage with the corresponding lifting rails 4 are fixedly installed on the inner slide plates 6. A drive gear is also rotatably installed on the inner slide plates 6. The drive gear is driven by a motor installed on the inner slide plates 6. The drive gear meshes with the lifting rack 5 to control the lifting height of the entire mounting frame 7. Based on the lifting of the mounting frame 7, the height of other components on the second-floor platform can be adjusted, thus facilitating folding.

[0064] A mounting platform 9 is fixed at the center of the far end of the mounting frame 7, away from the derrick 1. The mounting platform 9 is centered relative to the entire frame. A robotic arm 10 is mounted on the bottom of the mounting platform 9. The robotic arm can be any structure commonly used in two-tiered platforms, typically a four-axis or five-axis robotic arm. The mounting end of the robotic arm 10 is rotatably mounted to the center of the bottom of the mounting platform 9, and the rotation angle is controllable in one dimension. The gripping end of the robotic arm 10 is equipped with a linkage-structured gripping mechanism, which includes two sets of gripping components with relative opening and closing strokes. When the tubing is lifted, the opening and closing of the gripping mechanism grips the tubing, and in the gripping state, it drives the tubing to move between various positions based on the robotic arm 10. The robotic arm 10 can adopt the configuration commonly used in existing automated workover rigs.

[0065] The mounting frame 7 is provided with a feeding module and a buffer module on both sides, which are located on both sides of the mounting platform 9, so that the robot arm 10 can move between various workstations.

[0066] The mounting platform 9 is equipped with a cleaning module and a detection module at one end near the derrick 1.

[0067] 1. Cleaning module

[0068] The cleaning module includes a first head 24, a second head 32, and a cleaning ball;

[0069] 1.1 Cleaning Ball

[0070] In this design, the cleaning balls include Cleaning Ball No. 1, Cleaning Ball No. 2, and Cleaning Ball No. 3; each of Cleaning Ball No. 1, Cleaning Ball No. 2, and Cleaning Ball No. 3 includes a balloon body 11.

[0071] The balloon body 11 includes a skeleton, which includes an upper circular plate 12, an annular plate 13, and a lower circular plate 14 arranged vertically and overlappingly. The outer diameters of the upper circular plate 12, annular plate 13, and lower circular plate 14 correspond and are fixed by multiple layers of plates through a ring array of bone rods 15, forming a skeleton structure inside the balloon body. The annular plate 13 can be multi-layered, and in this example, it is two-layered. There are outwardly arched, flattened spherical airbags 16 between the upper circular plate 12 and the first layer of annular plate 13, between adjacent upper and lower annular plates 13, and between the last layer of annular plate 13 and the lower circular plate 14. The airbags 16 achieve sealing through the upper circular plate 12 and the lower circular plate 14. The balloon body 11 obtained by combining the skeleton and the structure of the multi-layered airbags 16 can achieve multi-layered outward arching in its length direction, thereby achieving multi-layered contact and sealing with the tube wall, obtaining an excellent sealing effect. At the same time, the airbags 16 also achieve squeezing and scraping with the tube wall to obtain a cleaning effect.

[0072] The outer diameter of the airbag 16 is slightly larger than or equal to the inner diameter of the oil pipe.

[0073] A circular tube-shaped interface tube 17 is provided in the center of the top surface of the upper circular plate 12, and symmetrical first pin holes 18 are provided on the side wall of the interface tube 17.

[0074] The air bladders 16 of multiple cleaning balls repeatedly scrape, squeeze, and remove oil stains and debris that are obviously adhered to the inner wall of the oil pipe, providing conditions for subsequent non-destructive testing.

[0075] With the initial goal of improving cleaning capabilities, we have further designed cleaning balls with different structures to achieve multi-dimensional internal wall cleaning, specifically including the following designs:

[0076] The bottom end of the No. 3 cleaning ball is provided with a docking block 19 that can be movably inserted into the interface tube 17. The bottom end of the docking block 19 is chamfered to facilitate insertion into the interface tube 17 and to facilitate vertical positioning and splicing when stacked.

[0077] The bottom center of the No. 2 cleaning ball is provided with a vertical rod 20 mounted on the lower disc. The bottom end of the vertical rod 20 is also provided with a connecting block 19. A spiral blade 21 is fixed on the vertical rod 20. The spiral blade 21 is a flexible rubber sheet with a downward-extending inclined blade cross-section. The outer side of the spiral blade 21 has an upward-folded edge with an upward angle of no more than 15 degrees relative to the horizontal plane. The folded edge of the spiral blade 21 contacts the pipe wall. Through the downward spiral shape of the spiral blade 21, it can apply and maintain good scraping pressure on the pipe wall when the cleaning ball descends. Its upward-folding feature adapts well to the pipe wall, reducing wear through its flexible deformation. The vertical rod 20 can be rotatably mounted to the lower disc of the No. 2 cleaning ball. A small motor located inside the ball body 11 is provided on the top surface of the lower disc, thereby driving the spiral blade 21 to rotate and scrape and clean the oil and dirt adhering to the pipe wall.

[0078] The bottom of the No. 1 cleaning ball is centrally located with a vertical shaft 22 mounted on the lower disc. The bottom of the vertical shaft 22 is also provided with a docking block 19. The bottom of the vertical shaft 22 is provided with a miniature stirring blade 23. The vertical shaft 22 is rotatably mounted to the lower disc via a bearing. The top surface of the lower disc is provided with a small motor located inside the ball body 11, which drives the stirring blade 23 to rotate, thereby agitating the cleaning fluid and forming a water vortex that continuously flushes the inner wall of the oil pipe.

[0079] For the motors of cleaning balls 1 and 2, commercially available motor box modules can be used, which come with a battery box, and the lower circular plate can be processed into an openable structure for easy replacement of the internal battery.

[0080] In practical use: Cleaning balls are deployed in a top-to-bottom order of 1-2-3, spaced at intervals within the oil pipe. Cleaning fluid (water or a mixture of crude oil cleaning agent) can be injected between adjacent balls. The bottommost cleaning ball (No. 1) seals the cleaning fluid, keeping it between balls 1 and 2, and between balls 2 and 3. The stirring blades 23 at the bottom of ball 3 agitate the cleaning fluid, repeatedly flushing the inner wall of the oil pipe. The rotating spiral blades 21 at the bottom of ball 2 scrape away impurities from the inner wall. Combined with the repeated squeezing and scraping by the multi-layered airbags 16 of the three cleaning balls, a highly efficient one-time cleaning of the oil pipe's inner wall is achieved, with results comparable to on-site cleaning lines. This enables on-site oil pipe maintenance, eliminating the need for centralized processing in the workshop and addressing the basic requirements for inner wall cleaning during testing.

[0081] When storing, in conjunction with the use of the material preparation tube 51, multiple cleaning balls are stacked in the material preparation tube 51 in the order of filling. Through the insertion of the docking block 19 and the interface tube 17, the material preparation is arranged by insertion, which facilitates modular feeding and preparation.

[0082] 1.2 First machine head 24

[0083] The bottom of the first machine head 24 is provided with a rotating disk 25 that is rotatably mounted to the inner end of the mounting platform 9. The rotating disk 25 has a 90-degree rotation stroke with the mounting platform 9. Based on this rotation stroke, the loading rod 28 of the first machine head 24 has a feeding position and a loading position. The rotation stroke enables the loading rod 28 of the first machine head 24 to switch between the two positions.

[0084] A support column 26 is fixed on the rotating disk 25. A lifting head with a second lifting stroke is sleeved on the upper part of the support column 26. A lifting cylinder 27 is installed on the top of the lifting head. The lifting cylinder 27 is driven by air or oil. A lifting cylinder 27 rod is provided at the bottom end of the lifting cylinder 27. The lifting cylinder 27 rod is fixed to the support column 26 to realize the lifting control of the lifting head. The second lifting stroke realizes the grabbing of materials and the filling action on the top of the oil pipe.

[0085] The lifting head is equipped with a loading rod 28 at one end near the derrick 1. The bottom end of the loading rod 28 is equipped with a telescopic pin 29, which extends and retracts horizontally. Two telescopic pins 29 are arranged opposite each other and are movably connected to the first pin hole 18 of the top interface tube 17 of the cleaning ball. After connection, the bottom end of the loading rod 28 is fixed to the interface tube 17 of the cleaning ball. The telescopic pin 29 is an electromagnetic pin, capable of extending or retracting electrically to control the interaction with the top interface tube 17 of the cleaning ball, thereby enabling the gripping and material handling of the cleaning ball.

[0086] During alignment, the position of the first pin hole 18 can be pre-aligned with the extension position of the loading position telescopic pin 29. Alternatively, a rotation function can be added to the loading rod 28 so that the loading rod 28 can rotate based on motor control, thereby automatically adjusting the telescopic pin 29 to align with the first pin hole 18.

[0087] Both the loading rod 28 and the lifting head are equipped with multiple fixing clips 30. These clips are used to fix the flexible water pipe 31 and assist in its routing. The bottom end of the flexible water pipe 31 has an injection port. An electrically controlled valve is installed on the flexible water pipe 31 or the injection port. The injection port is located on one side of the telescopic pin 29 and is used to inject liquid into the oil pipe opening. The flexible water pipe 31 is connected to a storage tank, which is fixed on the mounting platform 9 and used to store reagents. Not limited to this design, the flexible water pipe 31 can also be directly connected to a water source or storage tank installed near the ground via a pipeline to provide liquid.

[0088] 1.3 Second machine head 32

[0089] The second head 32 is equipped with a lifting cylinder 33. The bottom end of the lifting cylinder 33 is provided with a lifting rod 34 that telescopically engages with it. The bottom end of the lifting rod 34 is provided with a plug cap 35 for sealing the top opening of the oil pipe. The bottom surface of the plug cap 35 has a cavity corresponding to the diameter of the top of the oil pipe, for inserting into the top opening of the oil pipe. A pleated airbag plug 36 is centrally located on the bottom surface of the cavity. The airbag plug 36 is a multi-layered airbag plug with an accordion-like pleated structure, which is inserted into the top opening of the oil pipe. The inner and outer sleeves of the plug are used to reliably seal the top end of the oil pipe. The plug cap 35 is equipped with an inflation tube 37 that runs through it from top to bottom. The bottom end of the inflation tube 37 passes through the bottom end of the airbag plug 36. The bottom end of the inflation tube 37 is provided with an inflation hole. The top end of the inflation tube 37 is connected to an air source to inject gas into the oil pipe, thereby increasing the air pressure in the upper part of the No. 1 cleaning ball in the oil pipe. Based on the air pressure, the cleaning ball system moves downward until it is discharged from the bottom end of the oil pipe.

[0090] *1.4 Recycling Organization

[0091] The system includes a collection box 38 located below the second machine head 32. The collection box 38 is an open-top container covering the area below the second machine head 32, used to collect fallen cleaning balls and cleaning fluid for unified recycling. The collection box 38 can be designed as a telescopic structure, reaching the corresponding position to collect the cleaning balls during pressurization and inflation, and then clearing its bottom position for the next collection. Specifically, an installation arm 42 can be provided, one end of which is hinged to the upper part of the lower frame, with its rotation angle controlled by a motor. The bottom of the collection box 38 has a strip plate 39 with a horizontally extending telescopic guide rail 40 and a telescopic rack 41. A telescopic slider is fitted onto the telescopic guide rail 40. A positioning platform 43 is located at the distal end of the installation arm 42. A telescopic gear is rotatably mounted below the positioning platform 43, and the telescopic slider is fixed thereunder, thereby enabling left and right telescopic control of the collection box 38 to create space in the middle of the working area.

[0092] The recycling bin 38 is equipped with a filter screen in the middle, which can retain the cleaning liquid at the bottom and leave the cleaning balls on the filter screen. A valve is set below the filter screen to facilitate the discharge of the cleaning liquid at the bottom, thereby facilitating subsequent recycling and processing.

[0093] 2. Detection Module

[0094] The detection module is used for on-site inspection of oil pipes. This design uses eddy current testing. Eddy current testing is commonly used in non-destructive testing of oil pipes. In addition to necessary main equipment, it also includes an extension cable 44 for in-depth testing inside the pipe and a probe. Operators can receive and view the test data based on wireless signals.

[0095] An equipment box 47 is provided on the mounting platform 9. Inside the equipment box 47 is a rotatably connected reel. The reel is driven to rotate by a motor, enabling precise control of the winding process. The extension cable 44 is wound around the reel, and its sufficient length is released or wound up by the rotation of the reel. An opening is provided at the top of the equipment box 47, through which the extension cable 44 passes, exposing the probe to the outside of the equipment box 47.

[0096] The probe is adapted to the diameter of the oil pipe.

[0097] Based on the structure of the oil pipe, the top of the oil pipe has an enlarged diameter section for connection with adjacent oil pipes. This section has a larger diameter than the oil pipe itself and is typically threaded and fitted to the bottom of the preceding oil pipe section. To connect with the oil pipe, the detection module has a insertion tube 46 on one side of the equipment box 47. The insertion tube 46 is adapted to the enlarged diameter opening at the top of the oil pipe and can be inserted into the enlarged diameter opening to guide the probe. The insertion tube 46 is fixed to the equipment box 47. The probe is located inside the insertion tube 46 when in standby mode. The insertion tube 46 serves as the probe's standby position, protecting and fixing the probe to prevent it from swinging, and can also be inserted into the enlarged diameter opening of the oil pipe to guide the probe.

[0098] The insertion tube 46 is provided with a positioning pulley group 48 above it, and there are two positioning pulley groups 48 arranged one above the other;

[0099] The device box 47 is equipped with a guide pulley assembly 49 on the side near the insertion tube 46. This device is designed with three guide pulley assemblies 49, arranged in a 2-upper-1-lower configuration, which improves the clamping and guiding effect on the extension cable 44 in both directions after turning. After the extension cable 44 exits the device box 47 through the opening, it passes through the guide pulley assembly 49 and the positioning pulley assembly 48 in sequence, hanging downwards to enter the standby position of the insertion tube 46. The top of the insertion tube 46 is equipped with a retaining ring 50 coaxial with it. The inner tube of the retaining ring 50 is used to pass through the extension cable 44. The retaining ring 50 prevents the probe from detaching from the top, thus ensuring that during transportation, when the extension cable 44 is tightened to position the probe inside the insertion tube 46, even when the second-tier platform is flipped and retracted or in vehicle-like conditions, the probe remains inside the insertion tube 46.

[0100] During testing, the probe's own counterweight (with additional counterweights as needed) allows the cable reel to detach and descend into the oil pipe, completing the test. With a pulley system, gravity-based descent is achieved through the guidance of two pulley sets. Beyond these structures, a motor can be added to the pulley system to enable active rolling, thereby gripping the extension cable and providing auxiliary force for downward deployment and upward pulling in conjunction with the cable reel.

[0101] Due to the requirements of oil pumping operations, well workover work on tubing needs to be performed periodically, so most of the tubing sent for inspection is still usable. Therefore, to streamline the repetitive transportation, feeding, treatment, loading / unloading (at the inspection station), and packaging processes involved in tubing inspection, we proposed the idea of ​​conducting inspections on-site. However, since tubing inspection requires cleaning to remove impurities and oil stains from the inner wall, and given the tubing's long and thin shape, on-site inspection is impossible. This device, through improvements to the bottom of the workover rig and the second-level platform, makes on-site inspection possible. The operation of the cleaning ball revolutionizes existing cleaning operations that require equipment to enter and exit the tubing, eliminating the need for excessively long cleaning strokes and ultrasonic immersion equipment. It achieves cleaning in an upright position with excellent results, representing a significant breakthrough in the industry.

[0102] 3. Material feeding module

[0103] The feeding module is used for storing and feeding the cleaning balls.

[0104] It includes multiple independently installed material preparation pipes 51, as well as a material hanging mechanism and a material feeding mechanism located on one side of the mounting frame 7.

[0105] 3.1 Material preparation pipe 51

[0106] The material preparation tube 51 is a straight-extending tubular material rack. The two sides of the material preparation tube 51 are symmetrically provided with strip-shaped holes 52 adapted to its length. The top of the material preparation tube 51 is provided with a positioning tube opening. The side walls of the material preparation tube 51 are fixed with opposing fins 53. The fins 53 are used to improve the support strength of the material preparation tube 51 in length. The two fins 53 are respectively provided with tube grippers 54 and hanging plates 55. The hanging plates 55 are provided with two upper and lower hanging sleeves 56. The hanging plates 55 are provided with two second pin holes 57. The inner diameter of the material preparation tube 51 is adapted to the inner diameter of the oil pipe and the air bladder 16. A single air bladder 16 can be freely inserted into the material preparation tube 51.

[0107] The gripping tube 54 is used to facilitate gripping by the clamping mechanism of the robotic arm 10. The gripping tube 54 is similar in diameter to the oil pipe and can be used in conjunction with the robotic arm 10 for gripping the oil pipe. The robotic arm 10 used for gripping the oil pipe can also grip the gripping tube 54.

[0108] The bottom end of the material preparation tube 51 is provided with a support sleeve 58, and the top end of the support sleeve 58 is provided with a recess. The recess is movably connected to the docking block 19 to support the lowest cleaning ball. If the docking block 19 is not present, the bottom disk of the lowest cleaning ball can also be supported by the top surface of the support sleeve 58.

[0109] Based on the material preparation tube 51, the cleaning balls are stacked sequentially in the order of 3-2-1-3-2-1... within the material preparation tube 51. This enables the loading and preparation of the cleaning balls.

[0110] 3.2 Material hanging mechanism

[0111] It includes at least two rows of hanging racks, each rack having two hanging rods 59, and a hanging sleeve 56 that is movably connected to the hanging rods, thereby fixing a material preparation tube 51 through the two hanging rods.

[0112] The mounting frame 7 has a machine position plate 65 on one side, and a stop post 60 is provided at one end of the hanging rod 59. The end of the stop post 60 away from the hanging rod 59 is fixed on the machine position plate 65. The stop post 60 blocks the hanging sleeve 56, so that the material preparation tube 51 is a certain distance away from the machine position plate 65, so that when the material preparation tube 51 is full, it can still make room for the feeding mechanism.

[0113] This example sets up two rows of material racks, one row for placing material preparation tubes 51 filled with cleaning balls, and the other row for placing empty material preparation tubes 51.

[0114] In order to keep the material preparation pipe 51 attached to the hanging frame, a locking mechanism is provided at the outer end of the hanging frame.

[0115] The locking mechanism can be any structure that blocks the outer end of the hanging rod 59, for example:

[0116] Structure 1: The locking mechanism can be an electromagnetic pin installed at the outer end of the hanging rod 59. The extension and retraction direction of the pin head is consistent with the radial direction of the hanging rod 59. After it extends, it can block the hanging sleeve 56 and maintain the hanging of the material preparation tube 51.

[0117] Structure 2: A more reliable sealing structure can also be adopted. For example, a fixing plate 61 is fixed near the rear end of the mounting frame 7. A smooth rod 62 slides through the fixing plate 61 and is horizontally slidably engaged with it. A guide sleeve is provided on the fixing plate 61 and sleeved on the outside of the smooth rod 62. An I-beam 63 is provided at the end of the smooth rod 62 near the hanging frame, and a connecting frame is provided at the end of the smooth rod 62 away from the hanging frame. A drive component for controlling the horizontal stroke position of the I-beam 63 is installed on the connecting frame. A hydraulic cylinder structure can be used directly on the connecting frame to push and pull the I-beam 63 using the cylinder rod. Combined with the guidance of the guide sleeve, the push and pull stroke of the I-beam 63 and the hanging rod 59 in the same direction is completed.

[0118] Multiple locking caps 64 are fixed on the I-beam frame 63. The locking caps 64 are movably inserted into the outer end of the hanging rod 59. Based on the push-pull stroke of the I-beam frame 63 and the hanging rod 59 in the same direction, the outer end of the hanging frame is blocked. Combined with the stop column 60 limiting the inner end of the hanging frame, both ends of the hanging rod 59 are blocked. Therefore, when the hanging rod 59 is full of material preparation tubes 51, the hanging of all material preparation tubes 51 is locked, so that the second layer frame can maintain the hanging in a better way during the flipping.

[0119] 3.3 Feeding Mechanism

[0120] The inner side of the machine plate 65 is provided with an arc-shaped positioning groove 66. The arc-shaped surface of the positioning groove 66 is adapted to the circumferential surface of the material preparation tube 51. The loading position of the first machine head 24 is aligned vertically with the positioning groove 66. When the material preparation tube 51 is located in the positioning groove 66, and when the first machine head 24 is located in the loading position, the bottom end of the loading rod 28 of the first machine head 24 is located above the positioning tube opening of the material preparation tube 51 and the two are coaxially aligned.

[0121] The positioning groove 66 has outwardly flared openings on both sides to facilitate cooperation with the material preparation tube 51 and make it easier to guide the material preparation tube 51. The positioning groove 66 has a centrally located slot 67, which is a vertical through-slot that passes through the machine position plate 65. The slot 67 is movably inserted into the hanging plate 55. When the outer wall of the material preparation tube 51 is coaxially positioned against the positioning groove 66, the hanging plate 55 is inserted into the slot 67.

[0122] The slot 67 has two positioning pins 68 on its side wall. The positioning pins 68 are movably connected to the second pin hole 57. The positioning pins 68 can also be set as electromagnetic pins. By connecting the positioning pins 68 to the hanging plate 55 inserted into the slot 67, the material preparation tube 51 located in the positioning groove 66 is fixedly positioned.

[0123] The positioning groove 66 is provided with symmetrical stroke frames 69 on both sides. The stroke frames 69 adopt a box structure, which is beneficial to protect the internal transmission components. (In the horizontally unfolded state of the second-layer platform) The lifting guide rail 70 and the lead screw 71 are vertically installed inside the travel frame 69. The lead screw 71 is fitted with a lead screw nut, and the lifting guide rail 70 is fitted with a lifting slide 72. The lead screw nut is fixed on the lifting slide 72, and the lifting slide 72 is also fixed with an electric push cylinder 73. The electric push cylinder 73 is provided with a support rod 74 that is telescopically coordinated with it. The support rods 74 on both sides of the travel frame 69 are coaxially opposite to each other, and the two support rods 74 have a telescopic stroke in opposite directions. Based on this telescopic stroke, the inner ends of the two support rods 74 can move closer or further away from each other. The inner end of the support rod 74 is provided with a support block 75. When the support rod 74 is retracted into the electric push cylinder 73, the distance between the two support blocks 75 is greater than the diameter of the airbag 16. When the support rod 74 is extended out of the electric push cylinder 73, the distance between the two support blocks 75 is less than the diameter of the lower disc, thereby lifting the bottom cleaning ball.

[0124] When the material preparation tube 51 is positioned and fixed in the positioning groove 66, the bottom end of the travel frame 69 is adapted to the bottom end of the material preparation tube 51. The support rod 74 extends so that the support block 75 is positioned below the cleaning ball at the bottom of the material preparation tube 51. The screw 71 is started to rotate so that the lifting slide 72 is lifted up, which can lift a stack of cleaning balls upwards until the topmost cleaning ball is located at the positioning tube opening at the top of the material preparation tube 51.

[0125] 4. Caching module

[0126] The cache module is used to store oil pipes that have passed inspection.

[0127] The buffer module includes an oil pipe rack 76, which is a commonly used oil pipe placement rack. The oil pipe rack 76 is fixed to one side of the mounting frame 7, and a channel is left between the oil pipe rack 76 and the mounting platform 9 to facilitate the passage of the robotic arm 10 to clamp the oil pipe.

[0128] After inspection, if the tubing is problem-free, it is placed directly on the tubing rack 76. If there is a problem, it is unloaded and retrieved from the ground. Once all tubing has been retrieved, the buffer module is cleaned before re-laying. Tubing that passes inspection is directly lowered into the ground. New tubing is added to compensate for the number of defective tubing, thus completing the well workover operation. This process of removing, cleaning, inspecting, and reusing all tubing on-site significantly reduces production steps and costs.

[0129] Based on this workover rig, the workover operation includes the following procedures:

[0130] After the second-tier platform is deployed and stabilized, the I-beam frame 63 moves away from the hanging rod 59, leaving the outer end of the hanging rod 59 unblocked.

[0131] The robotic arm 10 grabs one of the preparation tubes 51 loaded with cleaning balls (the gripping position 54 of the preparation tube 51), moves it to the rear end until it is free from the hanging rod 59, and then the robotic arm 10 continues to hold the preparation tube 51 so that it is aligned with the positioning groove 66. The hanging plate 55 is inserted into the slot 67, and the positioning pin 68 locks the second pin hole 57. The preparation tube 51 is then fixed in the positioning groove 66.

[0132] The lifting slide 72 is located at the bottom of its stroke, and the two support rods 74 extend towards each other, so that the support block 75 is located below the cleaning ball airbag 16 at the bottom of the material preparation tube 51.

[0133] After the well workover operation is carried out, when the tubing is lifted to the height of the second platform by the traveling block hook, the robotic arm grabs the tubing and sends it to the loading position of the first machine head 24 to wait.

[0134] Grabbing the cleaning ball: The first head 24 rotates to above the material preparation pipe 51 (material loading position), the first head 24 descends so that the loading rod 28 approaches the cleaning ball above the positioning pipe opening of the material preparation pipe 51, until the bottom end of the loading rod 28 is inserted into the interface pipe 17 at the top of the cleaning ball, the telescopic pin 29 is inserted into the first pin hole 18, so that the loading rod 28 grabs the cleaning ball, then the first head 24 lifts the cleaning ball and rotates to the loading position, aligning the cleaning ball with the oil pipe opening located at that position;

[0135] Loading cleaning balls: The first head 24 drops down, inserts the cleaning balls into the oil pipe through the top opening, and then releases the gripper;

[0136] If cleaning fluid is used, when the first head 24 falls, the cleaning ball should be inserted into the top of the oil pipe to a certain depth before releasing the telescopic pin 29.

[0137] Repeat the actions of grabbing and loading cleaning balls multiple times. If cleaning balls No. 1, No. 2, and No. 3 are used in combination, then based on the order of No. 3-2-1 cleaning balls stacked in the material preparation pipe 51, the above actions of grabbing and loading cleaning balls can be performed. Cleaning fluid needs to be injected into the oil pipe after the first two actions of loading cleaning balls are completed.

[0138] Pressurized ball movement: After the above loading is completed, the robot arm 10 moves the oil pipe to the second head 32, so that the oil pipe opening is coaxially aligned with the plug cap 35 of the second head 32. The lifting rod 34 falls down, so that the air bag plug 36 is inserted into the oil pipe opening, and the plug cap 35 seals the top opening of the oil pipe. The air source is started to inject gas into the oil pipe opening, so that the pressure inside the pipe above the cleaning ball air bag 16 at the top of the oil pipe increases, pushing the 3-ball cleaning system to move downward until it is discharged from the bottom and falls into the recovery box 38.

[0139] Inspection: The robot arm 10 moves the oil pipe to the inspection module, so that the oil pipe opening is below the insertion tube 46. The robot arm 10 controls the oil pipe to move upward until the oil pipe opening is inserted into the bottom of the insertion tube 46. The coil rotates to release the extension cable 44, so that the probe falls vertically into the oil pipe. After the probe falls along the oil pipe to the bottom of the oil pipe, the coil rotates in the opposite direction to wind up the extension cable 44, so that the probe is lifted up, completing one eddy current inspection of the oil pipe.

[0140] Sorting: Unqualified oil pipes are transferred to the traveling car hook by the robotic arm 10 and unloaded to the ground; qualified oil pipes are placed on the buffer module of the second-level platform by the robotic arm 10, and when the pipes are unloaded again, the oil pipes temporarily stored on the buffer module are directly put into use.

[0141] This operational method eliminates the need to replace a large number of tubings during well workover operations. It also eliminates the need to carry a large number of tubings or bring all the tubing up to the workshop. Furthermore, it eliminates the need for cleaning and testing on the production line. The tubing can be quickly cleaned and tested on-site and then put back into use. This ensures production safety, greatly simplifies the well workover process, improves efficiency, and reduces costs, providing a completely new model for the development of well workover operations.

Claims

1. A workover rig comprising a derrick loaded on a vehicle body, a second floor is installed on the derrick, an installation frame is arranged in the second floor, an installation platform is fixed in the middle of the far end side of the derrick away from the installation frame, a mechanical hand for gripping a tubing is installed at the bottom of the installation platform, characterized in that: The mounting platform is equipped with a cleaning module and a detection module at one end near the derrick, and a buffer module is provided on one or both sides of the mounting frame; The cleaning module includes a cleaning ball and a second head. The cleaning ball includes one or more overlapping air bladders, the maximum diameter of which corresponds to the inner diameter of the oil pipe. The second head is provided with a lifting rod that can be raised and lowered. The bottom end of the lifting rod is provided with a plug cap that cooperates with the oil pipe opening. An inflation pipe is installed on the plug cap. The bottom of the inflation pipe is provided with an inflation hole located within the range of the oil pipe opening. The inflation pipe is connected to an air source for inflating the top of the sealed oil pipe. The detection module uses an eddy current detection device, including an extension cable and a probe. The probe has a vertical reciprocating stroke based on the extension cable's winding and unwinding. The cache module is used to temporarily store oil pipes that have passed the inspection; The bottom surface of the plug is provided with a cavity corresponding to the top diameter of the oil pipe. An airbag plug is provided in the center of the bottom surface of the cavity. The airbag plug is a multi-layered airbag plug with an accordion pleated structure. The airbag plug is adapted to the top inner diameter of the oil pipe. The inflation tube passes through the airbag plug in the center and exposes the inflation hole below the airbag plug. The cleaning module also includes a first machine head mounted on the mounting platform. The first machine head has a loading rod at one end near the derrick. The bottom end of the loading rod has a telescopic pin, which is movably connected to a first pin hole. The first machine head has a second lifting stroke and a rotating stroke relative to the mounting platform. Based on the rotating stroke, the loading rod of the first machine head has a feeding position and a loading position. The rotating stroke enables the loading rod of the first machine head to switch between the two positions. The cleaning module also includes a recovery box located below the second head. The recovery box is an open container with a strip plate fixed to its bottom. The strip plate is provided with a telescopic guide rail and a telescopic rack. A telescopic slider is fitted on the telescopic guide rail. An installation arm with a flipping stroke is also installed on the derrick. A positioning platform is provided at the end of the installation arm away from the derrick. The telescopic slider is fixed on the positioning platform. A telescopic gear that meshes with the telescopic rack is rotatably installed below the positioning platform. The cleaning ball includes a spherical body. The spherical body includes a skeleton. The skeleton includes an upper circular plate, several ring plates, and a lower circular plate that are aligned and overlapped. The outer diameters of the upper circular plate, ring plates, and lower circular plates correspond and are all connected by a ring array of bone rods. The airbag is located between the circular plate and the first ring plate, between adjacent ring plates, and between the last ring plate and the lower circular plate. A circular tube-shaped interface pipe is provided in the center of the top surface of the upper circular plate. Symmetrical first pin holes are provided on the side wall of the interface pipe.

2. A workover rig as claimed in claim 1 wherein, The extension cable is wound on a motor-controlled spool. The probe is located inside the insertion tube, which is fixed relative to the mounting platform. The outer diameter of the insertion tube is adapted to the inner diameter of the oil pipe opening. A retaining ring is provided at the top of the insertion tube, which is coaxial with it. The inner tube of the retaining ring is used to pass through the extension cable.

3. A workover rig as claimed in claim 1 wherein, The loading rod is mounted on a motor-controlled basis and is rotatable relative to the first machine head. and / or A flexible water pipe is provided on one side of the loading rod, and an injection port is provided at the bottom end of the flexible water pipe. An electrically controlled valve is installed on the flexible water pipe or the injection port, and the flexible water pipe is connected to a water source or a cleaning liquid source.

4. The workover rig of claim 1, wherein, The cleaning balls include No. 1 cleaning ball, No. 2 cleaning ball, and No. 3 cleaning ball, and the order in which they are placed in the oil pipe from top to bottom is No. 1 cleaning ball, No. 2 cleaning ball, and No. 3 cleaning ball. The bottom end of the No. 3 cleaning ball is provided with a docking block that can be movably inserted into the interface tube. A vertical rod is rotatably mounted on the lower circular plate of the No. 2 cleaning ball. A connecting block is also provided at the bottom end of the vertical rod. A spiral blade is fixed on the vertical rod. The spiral blade is a flexible rubber sheet. The spiral blade is an inclined blade with a downward-extending cross section. The outer side of the spiral blade is provided with an upward-folded edge. The folded edge has an upward angle of no more than 15 degrees relative to the horizontal plane. The folded edge of the spiral blade is in contact with the wall of the oil pipe. A vertical shaft is rotatably mounted on the lower circular plate of the No. 1 cleaning ball, and a docking block is also provided at the bottom end of the vertical shaft. A stirring blade is provided at the bottom of the vertical shaft.

5. The workover rig of claim 1, wherein, It also includes a material supply module located on one side of the mounting frame, the material supply module including a hanging mechanism, a feeding mechanism, and multiple independent material preparation pipes; The material preparation tube is a straight-extending tubular material rack. Symmetrical strip-shaped holes, adapted to its length, are opened on both sides of the tube. A positioning port is located at the top of the tube. Finned plates are fixed opposite each other on the side walls of the tube. Each finned plate has a gripper and a hanging plate. The gripper works in conjunction with a robotic arm. The hanging plate has two hanging sleeves and two second pin holes. The material hanging mechanism includes at least two rows of material hanging racks, each rack including upper and lower hanging rods, and the hanging sleeve is movably connected to the hanging rod; The feeding mechanism includes an inner arc-shaped positioning groove, the arc surface of which is adapted to the circumference of the material preparation tube, and the positioning groove is coaxially aligned with the loading rod located at the feeding position. A slot is provided in the center of the positioning groove, and the slot is movably inserted into the hanging plate. Two positioning pins are provided on the side wall of the slot, and the positioning pins are movably connected to the second pin hole. Stretch frames are symmetrically provided on both sides of the positioning groove. Each stretch frame is provided with a synchronously lifting material lifting slide. A support rod is installed on the lifting slide. The two support rods are coaxially arranged and have a counter-linear telescopic stroke. Based on this telescopic stroke, the inner ends of the two support rods can move closer or further apart. The inner end of the support rod is provided with a support block. When the support rod is retracted into the electric push cylinder, the distance between the two support blocks is greater than the diameter of the airbag. When the support rod is extended out of the electric push cylinder, the distance between the two support blocks is less than the diameter of the lower circular plate. When the material preparation tube is positioned and fixed in the positioning groove, the bottom end of the stretch frame is adapted to the bottom end of the material preparation tube.

6. The workover rig of claim 1, wherein, The derrick includes an upper derrick and a lower derrick that are telescopically connected. The second platform includes a rectangular frame body. One end of the frame body is hinged to the lower part of the upper derrick, so that the second platform has a 90-degree rotation stroke relative to the upper derrick from retraction to expansion. The mounting frame has a first lifting stroke relative to the frame body, and the first lifting stroke is perpendicular to the plane where the frame body is located.

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