A device and method for cleaning and applying protective coatings to connectors

Abstract

This invention belongs to the field of oil drilling technology, and specifically relates to a protective joint cleaning and coating device and method; it includes a control system, a top drive body, and a back clamp; a cleaning and coating device is installed on the back clamp; the top drive body drives the protective joint to rotate, and the cleaning and coating device faces the outer wall of the protective joint; the control system controls the top drive body and the back clamp to perform drilling stand-up operations, and controls the operation of the cleaning and coating device; the cleaning and coating device includes a cleaning component and a coating component; the cleaning component and the coating component are connected to the power system inside the top drive body; the top drive body includes a power swivel and a pipe handling device; the power swivel drives the protective joint to rotate through the spindle; the pipe handling device is used to connect and disconnect the drill string, and the back clamp is located at the lower end of the pipe handling device; while ensuring that the original structure of the top drive body remains unchanged, the overall structure is simplified, and the overall operating efficiency is improved, ensuring that the protective joint is always kept clean and lubricated when connecting the stand-up.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling technology, and specifically relates to a device and method for cleaning and coating protective joints. Background Technology

[0002] Top drive drilling rigs (hereinafter referred to as top drives) are key equipment in oil and gas drilling operations. The trend of unmanned use of top drives is an important way and means to accelerate the iterative upgrading of oil and gas engineering technology and equipment.

[0003] However, the frequent tripping of the drill string during drilling often causes wear and failure of the connecting threads of the top drive protection joint. Currently, on-site operators still need to manually clean and apply thread grease to the male threads connecting the top drive adapter and the drill string, which greatly reduces the automation level of drilling operations.

[0004] The protective connector is a conversion connector located between the top drive equipment and the drill pipe, protecting the threads of the lower blowout preventer (BOP) of the top drive. It facilitates thread type conversion and connection. Its upper thread connects to the lower BOP, and its lower end connects to the drill string. It is subject to frequent connection and disconnection operations and is a consumable part used in the drilling field. Statistics show that downtime caused by replacing protective connectors accounts for over 60% of total downtime, and the cost of protective connectors constitutes a significant proportion of the top drive's operating costs. Before connecting the protective connector to the drill string, the threads need to be cleaned and coated with a suitable thread grease as a lubricant and anti-wear agent. Thread grease is a paste-like substance at room temperature with high dynamic viscosity and poor flowability, posing challenges to the development of automated thread grease application devices.

[0005] Current research on automated thread grease spraying methods largely focuses on drill pipe and steel drill bit equipment. In drilling operations, there is still no dedicated device for spraying thread grease onto top drive protective joints. For a long time, cleaning the internal threads of protective joints and applying thread grease has relied on manual labor, resulting in wasted human resources and economic losses due to uneven application. Therefore, developing a method and device specifically for automated cleaning and application of thread grease to top drive protective joint threads is of great significance for improving construction quality, reducing costs, and effectively solving the problems of thread sealing and durability in protective joints. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a protective connector cleaning and coating device, comprising a control system, a top drive body, and a back clamp; a cleaning and coating device is mounted on the back clamp; the top drive body drives the protective connector to rotate, and the cleaning and coating device faces the outer wall of the protective connector.

[0007] The control system controls the top drive body and back clamp to perform drilling and foundation work, and controls the operation of the cleaning and coating device.

[0008] The cleaning and coating device includes a cleaning component and a coating component; the cleaning component and the coating component are connected to the power system inside the top drive body;

[0009] The top drive body includes a power swivel, a pipe handling device, and a drilling fluid circulation channel; the power swivel drives the protective joint to rotate via the spindle, and the power swivel is fixedly installed on the housing of the top drive body; the pipe handling device is used to connect and disconnect the drill string, and the back clamp is located at the lower end of the pipe handling device; the back clamp drives the cleaning and coating device to move to clean and oil the protective joint, thereby improving the operating efficiency of the top drive body.

[0010] Furthermore, the cleaning and application device also includes a first housing and a first drive source; the first drive source is installed on the first housing, the input end of the first drive source is connected to the power system, and the output end of the first drive source is connected to the cleaning component and the application component; a fixing component is installed on the first housing, and the fixing component is installed on the back clamp, and can be detachably connected to the back clamp through the fixing component, which facilitates the installation and connection of the cleaning and application device.

[0011] Furthermore, the cleaning assembly includes a first cavity and a cleaning head; the first cavity is located inside a first outer shell, the input end of the first cavity is connected to a first drive source, the output end of the first cavity is connected to the cleaning head, and a second valve is installed between the first cavity and the cleaning head; a first valve is installed between the power system and the first drive source.

[0012] Furthermore, the coating assembly includes an oiling mechanism and an oil storage tank; a second cavity is opened inside the first outer shell, and thread-locking grease is disposed in the second cavity; the oiling mechanism is installed on the outer wall of the first outer shell and is connected to the second cavity; the oil storage tank is installed inside the first outer shell, and an oil guide pipe is connected between one end of the oil storage tank and the second cavity; an oil inlet pipe is connected to the oil storage tank; a first cylinder is connected to the oil storage tank, and a transmission assembly is disposed between the first cylinder and the first drive source; a second valve is located between the second cavity and the first drive source.

[0013] Furthermore, the power system can be a pneumatic drive system, an electric drive system, or a hydraulic drive system; by employing different drive methods, the applicability of the device is improved.

[0014] Furthermore, the cleaning head includes a telescopic component and a cleaning brush head; the input end of the telescopic component is connected to a first drive source, and the output end of the telescopic component is connected to the cleaning brush head.

[0015] The oiling mechanism includes a telescopic rod and an oil brush; the input end of the telescopic rod is connected to a drive source, and the output end of the telescopic rod is connected to the oil brush.

[0016] Furthermore, the cleaning head includes an air guide tube and an air nozzle; the input end of the air guide tube is connected to a first drive source, and the output end of the air guide tube is connected to the air nozzle.

[0017] Furthermore, the cleaning and applicating device includes a second housing and a third housing; the second housing and the third housing are symmetrically mounted on both sides of the back clamp; the cleaning component is mounted on the second housing, and a second drive source is mounted on the second housing; the applicating component is mounted on the third housing, and a third drive source is mounted on the third housing.

[0018] The input ends of the second and third drive sources are connected to the power system, the output end of the second drive source is connected to the cleaning component, and a third valve is installed between the second drive source and the cleaning component; the output end of the third drive source is connected to the application component, and a fourth valve is installed between the third drive source and the application component.

[0019] This invention proposes a method for cleaning and applying protective coating to a connector, using any one of the aforementioned devices for cleaning and applying protective coating to a connector, specifically including the following steps:

[0020] After the drilling is completed, the top drive body separates from the drill string;

[0021] The top drive body rises, and the control system controls the back clamp to move the cleaning and coating device upward relative to the protective connector;

[0022] The control system controls the power system to supply power to the cleaning and coating device;

[0023] The cleaning and coating device cleans and applies lubricating material to the protective joint;

[0024] The top drive body stops rising, the top drive connects to the vertical shaft, and drilling operations begin.

[0025] Furthermore, the cleaning and coating device cleans the protective joint and applies lubricating material, specifically including the following steps:

[0026] The back clamp moves the cleaning assembly to a position directly opposite the threads of the protective connector, the control system activates the top drive body to drive the protective connector to rotate; the control system then activates the cleaning assembly.

[0027] The back clamp moves the applicator to a position directly opposite the threads of the protective connector, and controls the activation of the applicator.

[0028] Beneficial effects

[0029] The advantages of this invention over the prior art are as follows:

[0030] 1. This application integrates the cleaning and coating device with the top drive body and the back clamp, which simplifies the overall structure while ensuring that the original structure of the top drive body remains unchanged, and also improves the overall operating efficiency, ensuring that the protective joint is always kept clean and lubricated when connecting the vertical shaft.

[0031] 2. By closely integrating with the stand-up drilling process in on-site drilling operations, this invention can automatically complete the cleaning and thread grease application of the protective joint during the working gap between the top drive body disengaging from the drill pipe and the connecting stand, thus achieving the goal of multi-tasking operation in drilling rig operation.

[0032] 3. This application effectively solves the safety hazards caused by manual application of lubricating grease. Through automated operation, this method does not require additional rotating application mechanism or robotic arm components. The automatic cleaning and lubrication of the threads of the protective joint can be achieved by utilizing the rotational and upward posture changes of the spindle and the protective joint when the top drive body rises. This method simplifies the structure of the device and helps to automate and lighten the drilling equipment.

[0033] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A simplified diagram of the cleaning and application device in an embodiment of the present invention is shown.

[0036] Figure 2 A front view of the overall embodiment of the present invention is shown.

[0037] Figure 3 It shows Figure 2 A close-up view of the bottom of the back clamps.

[0038] Figure 4 A cross-sectional view of the cleaning and application device in an embodiment of the present invention is shown.

[0039] Figure 5 A schematic diagram of the structure in Embodiment 1 of the present invention is shown.

[0040] Figure 6A connection diagram of Embodiment 3 of the present invention is shown.

[0041] Figure 7 A connection diagram of Embodiment 4 of the present invention is shown.

[0042] Figure 8 A flowchart of the method in Embodiment 5 of the present invention is shown.

[0043] In the picture, 1. Power faucet; 2. Pipe treatment device; 3. Back clamps;

[0044] 4. Cleaning and coating device; 41. Housing No. 1; 42. Drive source No. 1;

[0045] 43. Cleaning component; 432. Cleaning head; 4321. Telescopic component; 4322. Cleaning brush head; 4323. Air guide tube; 4324. Air nozzle;

[0046] 44. Coating assembly; 441. Oiling mechanism; 4411. Telescopic rod; 4412. Oil brush; 442. Oil tank; 444. Oil guide pipe; 445. Oil inlet pipe; 446. Cylinder No. 1; 447. Transmission assembly;

[0047] 45. Fixed component; 46. Second housing; 47. Third housing; 48. Second drive source; 49. Third drive source;

[0048] 5. Valve No. 2. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In this application, during drilling operations, after completing one set-in drilling, the operation enters the set-in connection process; the top drive body separates from the drill string and begins to rise; during the rise of the top drive body, the control back tongs can rise synchronously with the protective joint to the corresponding position; the power swivel is used to drive the spindle to rotate, thereby driving the protective joint to rotate; during the rotation of the protective joint, the cleaning component and the application component clean the protective joint and apply thread grease.

[0051] This application provides a device for cleaning and applying protective coatings to connectors, see reference. Figure 1 , Figure 2 and Figure 3It includes a control system, a top drive body and a back clamp 3; a cleaning and applicating device 4 is installed on the back clamp 3; the top drive body drives the protective connector to rotate, and the cleaning and applicating device 4 faces the outer wall of the protective connector.

[0052] The cleaning and application device 4 includes a cleaning component 43 and an application component 44; the cleaning component 43 and the application component 44 are connected to the power system inside the top drive body;

[0053] The top drive body includes a power faucet 1 and a pipe processing device 2; the power faucet 1 drives the protective connector to rotate through the spindle; the pipe processing device 2 is used to connect and uncouple the drill string, and the back clamp 3 is located at the lower end of the pipe processing device 2. Figure 2 In the diagram, 'a' represents the drilling fluid circulation channel; the back tongs 3 are used to assist in the connection of drill pipe joints during drilling operations. The back tongs 3 are not installed with the spindle. The power system drives the clamping and releasing position changes, so they remain stationary while the spindle rotates. They can be used to perform the connection and release operations at any time and position by clamping the drill pipe joint.

[0054] During implementation, the power system on the top drive body provides sufficient power to the cleaning component 43 and the coating component 44; during drilling operations, the cleaning and coating device 4 does not contact the drill string and the protective joint, and does not affect normal drilling operations; after completing the sequential drilling of the vertical shaft, the operation enters the connection of the vertical shaft; the top drive separates from the drill string and begins to rise.

[0055] After the protective connector is uncoupled, the top drive body begins to rise. The operator independently controls the back clamp 3 to move up and down. The back clamp 3 drives the cleaning and coating device 4 to move relative to the protective connector, first causing the cleaning component 43 to automatically align with the threads of the protective connector. The cleaning component 43 is then activated, bringing it closer to the protective connector. The top drive body's spindle is then started to rotate, causing the protective connector to rotate. The cleaning component 43 works in conjunction with the rotation of the protective connector to clean its surface. After cleaning, the back clamp 3 drives the cleaning and coating device 4 to continue rising, causing the coating component 44 to align with the threads of the protective connector. The coating component 44 is then activated, and at a certain speed, the coating thickness is set according to the operational requirements to ensure that the coating is uniform and covers all threads of the protective connector. After cleaning the protective connector and applying thread grease, the top drive body continues to rise until it reaches the designated position for connecting the standpipe, and the standpipe connection begins. Once the connection between the standpipe and the drill string is complete, the drilling rig begins the next drilling operation.

[0056] During continuous drilling operations, as the top drive body rises to prepare for connecting the next vertical shaft, the cleaning and coating device 4 completes its work during the rising process of the top drive body.

[0057] This application integrates the cleaning and coating device 4 with the top drive body and the back clamp 3, which simplifies the overall structure while keeping the original structure of the top drive body unchanged, and also improves the overall operating efficiency, ensuring that the protective joint is always kept clean and lubricated each time the shaft is connected.

[0058] Example 1, Reference Figure 4 and Figure 5 The cleaning and coating device 4 also includes a primary housing 41 and a primary drive source 42. The primary drive source 42 is mounted on the primary housing 41, with its input end connected to the power system and its output end connected to the cleaning component 43 and the coating component 44. A fixing component 45 is mounted on the primary housing 41 and is mounted on the back clamp 3. The fixing component 45 can cooperate with the primary housing 41 through connecting pins and fixing pins to fix the cleaning and coating device 4 on the back clamp 3, ensuring that the cleaning and coating device 4 can rise smoothly relative to the protective joint when the top drive body rises, thus completing the entire cleaning and coating operation.

[0059] The cleaning component 43 includes a first cavity and a cleaning head 432; the first cavity is located inside a first outer shell 41, the input end of the first cavity is connected to a first drive source 42, the output end of the first cavity is connected to the cleaning head 432, and a second valve 5 is installed between the first cavity and the cleaning head 432; a first valve is installed between the power system and the first drive source 42.

[0060] The cleaning head 432 includes an air guide tube 4323 and an air nozzle 4324; the input end of the air guide tube 4323 is connected to the first drive source 42, and the output end of the air guide tube 4323 is connected to the air nozzle 4324.

[0061] The coating assembly 44 includes an oiling mechanism 441 and an oil storage tank 442; a second cavity is opened inside the first outer shell 41, and thread-locking grease is disposed in the second cavity; the oiling mechanism 441 is installed on the outer wall of the first outer shell 41 and is connected to the second cavity; the oil storage tank 442 is installed inside the first outer shell 41, and an oil guide pipe 444 is connected between one end of the oil storage tank 442 and the second cavity; an oil inlet pipe 445 is connected to the oil storage tank 442; a first cylinder 446 is connected to the oil storage tank 442, and a transmission assembly 447 is disposed between the first cylinder 446 and the first drive source 42; a second valve 5 is located between the second cavity and the first drive source 42.

[0062] As the top drive disengages from the drill pipe and rises, the operator controls the back tong 3 to slowly descend. The power system is a hydraulic system, with two oil passages between the power system and the back tong 3. The first valve connected to the two oil passages is a normally closed shuttle valve. When the first valve is open, the second valve 5 is in cleaning mode. The second valve 5 is a two-position three-position normally closed pneumatic sequence valve or a two-position three-position normally closed pneumatic directional valve. The first drive source 42, connected to the first valve, is driven by hydraulic oil to compress the air in the first cavity. After passing through the second valve 5, the air is supplied to the air nozzle 4324 through the air guide pipe 4323. The air is sprayed from the air nozzle 4324 onto the threads of the protective joint to clean the threads. The rotation of the protective joint also cleans the threads at various positions of the protective joint. The distance between the air nozzle 4324 and the protective joint is set within a suitable range to achieve the cleaning and thread grease application effects while ensuring that the back tong 3 does not come into contact with the drill pipe when moving up and down, thus affecting normal threading operations.

[0063] The back clamp 3 moves the application component 44 to a position opposite to the threaded connection of the protective connector; the first cylinder 446 is activated, and the first drive source 42 provides power to the first cylinder 446 through the transmission component 447. The first cylinder 446 squeezes the thread grease in the oil tank 442, and the thread grease in the oil tank 442 enters the second chamber through the oil guide pipe 444; then the second valve 5 is controlled to open in the thread grease application mode, and the hydraulic oil of the power system flows into the application component 44 through the first drive source 42, and then through the spring b (according to...). Figure 5 As shown in the diagram, the second chamber is compressed to create sufficient high pressure, which sprays the thread-locking grease in the second chamber onto the protective joint through a high-pressure air nozzle, automatically completing the application of thread-locking grease to the threads of the protective joint. After cleaning and thread-locking grease application are completed, the operator closes the cleaning and application device 4 using the control button on the driller's platform. At this time, the top drive will continue to rise to the stand position. Among them, valve 1, valve 2, and cylinder 446 are battery-powered. They can only be opened when the operator installs the battery and starts the cleaning and application device 4 during drilling operations. The cleaning and application device 4 requires no external driving force other than the high-pressure oil provided by the tee pipe and valve 1 (normally closed shuttle valve).

[0064] In Example 2, the power system is a pneumatic drive system, an electric drive system, or a hydraulic drive system.

[0065] During implementation, the power system in the top drive can be connected to an air source inside the top drive rotating head, and the power source adopts a pneumatic drive method; similarly, it provides power to the cleaning and coating device 4 without affecting the normal drilling operation; when the top drive rises, the cleaning and coating device 4 is activated, and the gas enters the first drive source 42 through the power system, which in turn provides power to the inside of the cleaning and coating device 4; the gas pushes the gas in the first chamber to coat the protective joint and the gas squeezes the thread grease in the second chamber to coat the protective joint; the control system controls the cleaning and coating process to be completed in sequence; the operator can turn off the cleaning and coating device 4 by turning off the air source switch on the control panel, and the top drive body can continue to complete the connection and erection operation.

[0066] Example 3, reference Figure 6 The cleaning head 432 includes a telescopic component 4321 and a cleaning brush head 4322; the input end of the telescopic component 4321 is connected to the first drive source 42, and the output end of the telescopic component 4321 is connected to the cleaning brush head 4322.

[0067] The oiling mechanism 441 includes a telescopic rod 4411 and an oil brush 4412; the input end of the telescopic rod 4411 is connected to the first drive source 42, and the output end of the telescopic rod 4411 is connected to the oil brush 4412.

[0068] During implementation, the cleaning component 43 and the coating component 44 use a brushing method to clean and lubricate the protective joint; by controlling the movement of the back clamp 3 and starting the cleaning coating device 4, the first drive source 42 squeezes the first cavity, and the first cavity drives the telescopic mechanism to extend the cleaning brush head 4322. When the main shaft of the top drive body rotates and drives the protective joint to rotate, the cleaning brush head 4322 performs a circumferential cleaning of the protective joint; the cleaning brush head 4322 can be made of suitable materials and shapes such as bristles or wire brushes; the length of the telescopic mechanism is set according to the horizontal distance from the back clamp 3 to the protective joint; after cleaning, the second valve 5 is controlled to change the valve port, and the telescopic mechanism of the cleaning brush head 4322 is retracted due to pressure changes;

[0069] Cylinder 446 squeezes thread grease from oil tank 442 into cavity 2. Valve 5 is converted to the output port of applicator 44, driving telescopic rod 4411 to extend until brush 4412 touches the protective connector to apply thread grease. Valve 5 can be a suitable two-position three-position normally closed valve such as a directional valve, sequence valve, or pressure regulating valve. Before the operator turns on the cleaning applicator 4, the cleaning brush head 4322 and brush 4412 are both in a retracted state, the brush outlet on housing 41 is sealed, and the diameters of telescopic rod 4411 and brush 4412 are kept appropriate to prevent thread grease leakage.

[0070] Example 4, Reference Figure 7The cleaning and applicating device 4 includes a second housing 46 and a third housing 47; the second housing 46 and the third housing 47 are symmetrically installed on both sides of the back clamp 3; the cleaning component 43 is installed on the second housing 46, the second driving source 48 is installed on the second housing 46, the applicating component 44 is installed on the third housing 47, and the third driving source 49 is installed on the third housing 47;

[0071] The input ends of the second drive source 48 and the third drive source 49 are connected to the power system. The output end of the second drive source 48 is connected to the cleaning component 43. A third valve is installed between the second drive source 48 and the cleaning component 43. The output end of the third drive source 49 is connected to the application component 44. A fourth valve is installed between the third drive source 49 and the application component 44.

[0072] During implementation, the cleaning component 43 and the application component 44 are located on opposite sides of the central axis of the back clamp 3. Power is supplied to the second drive source 48 and the third drive source 49 through the power system. As the top drive moves the protective connector upward, the back drive moves the cleaning and application device 4 to the position corresponding to the thread of the protective connector. The control system drives the protective connector to rotate. The cleaning component 43 is started first, and the operator controls the third valve to open. After the cleaning component 43 starts cleaning half a turn of the thread of the protective connector, the application component 44 can be started and the fourth valve is controlled to open. The application component 44 applies thread grease to the half turn of the protective connector thread that has been cleaned. Afterward, the cleaning component 43 continues to clean the remaining half turn of the protective connector thread. The application component 44 and the cleaning component 43 work simultaneously, saving time for cleaning and applying thread grease.

[0073] Alternatively, the cleaning component 43 can be used to clean the threads of the protective connector multiple times before the application component 44 is activated to ensure the cleaning effect on the threads of the protective connector.

[0074] Example 5, Reference Figure 8 A method for cleaning and applying protective coating to a connector, using any one of the aforementioned devices for cleaning and applying protective coating, specifically includes the following steps:

[0075] After the drilling is completed, the top drive body separates from the drill string;

[0076] The top drive body rises, and the control system controls the back clamp 3 to drive the cleaning and coating device 4 to move upward relative to the protective connector;

[0077] The cleaning and coating device 4 cleans and applies lubricating material to the protective joint;

[0078] The top drive body stops rising, the top drive connects to the vertical shaft, and drilling operations begin.

[0079] The cleaning and coating device 4 cleans and applies lubricating material to the protective joint, specifically including the following steps:

[0080] Back clamp 3 moves cleaning component 43 to a position directly opposite the thread of the protective connector. The control system starts the top drive body, which rotates the spindle to drive the protective connector to rotate. The control system then starts cleaning component 43.

[0081] The back clamp 3 moves the application component 44 to a position directly opposite the threads of the protective connector, and controls the start of the application component 44.

[0082] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for cleaning and applying protective coating to a connector, characterized in that, It includes a control system, a top drive body and a back clamp (3); a cleaning and applying device (4) is installed on the back clamp (3); the top drive body drives the protective connector to rotate, and the cleaning and applying device (4) faces the outer wall of the protective connector; The control system controls the top drive body and back clamp (3) to perform drilling and root-laying operations, and controls the cleaning and coating device (4) to work. The cleaning and application device (4) includes a cleaning component (43) and an application component (44); the cleaning component (43) and the application component (44) are connected to the power system inside the top drive body; The top drive body includes a power faucet (1) and a pipe processing device (2); the power faucet (1) drives the protective joint to rotate through the spindle; the pipe processing device (2) is used to connect and uncouple the drill string, and the back clamp (3) is located at the lower end of the pipe processing device (2); The cleaning and applicating device (4) further includes a first housing (41) and a first drive source (42); the first drive source (42) is mounted on the first housing (41), the input end of the first drive source (42) is connected to the power system, and the output end of the first drive source (42) is connected to the cleaning component (43) and the applicating component (44); a fixing component (45) is mounted on the first housing (41), and the fixing component (45) is mounted on the back clamp (3); The cleaning component (43) includes a first cavity and a cleaning head (432); the first cavity is located inside a first outer shell (41), the input end of the first cavity is connected to a first drive source (42), the output end of the first cavity is connected to the cleaning head (432), and a second valve (5) is installed between the first cavity and the cleaning head (432); a first valve is installed between the power system and the first drive source (42); The coating assembly (44) includes an oiling mechanism (441) and an oil storage tank (442); a second cavity is provided inside the first outer shell (41), and thread-locking grease is provided in the second cavity; the oiling mechanism (441) is installed on the outer wall of the first outer shell (41), and the oiling mechanism (441) is connected to the second cavity; the oil storage tank (442) is installed inside the first outer shell (41), and an oil guide pipe (444) is connected between one end of the oil storage tank (442) and the second cavity; an oil inlet pipe (445) is connected to the oil storage tank (442); a first cylinder (446) is connected to the oil storage tank (442), and a transmission assembly (447) is provided between the first cylinder (446) and the first drive source (42); a second valve (5) is located between the second cavity and the first drive source (42).

2. The protective connector cleaning and coating device according to claim 1, characterized in that, Its characteristics are, The power system is a pneumatic drive system, an electric drive system, or a hydraulic drive system.

3. The protective connector cleaning and coating device according to claim 1, characterized in that, Its characteristics are, The cleaning head (432) includes a telescopic component (4321) and a cleaning brush head (4322); the input end of the telescopic component (4321) is connected to the first drive source (42), and the output end of the telescopic component (4321) is connected to the cleaning brush head (4322); The oiling mechanism (441) includes a telescopic rod (4411) and an oil brush (4412); the input end of the telescopic rod (4411) is connected to the first drive source (42), and the output end of the telescopic rod (4411) is connected to the oil brush (4412).

4. The protective connector cleaning and coating device according to claim 1, characterized in that, The cleaning head (432) includes an air guide tube (4323) and an air nozzle (4324); the input end of the air guide tube (4323) is connected to the first drive source (42), and the output end of the air guide tube (4323) is connected to the air nozzle (4324).

5. A protective connector cleaning and coating device according to claim 1 or 2, characterized in that, The cleaning and applicating device (4) includes a second housing (46) and a third housing (47); the second housing (46) and the third housing (47) are symmetrically mounted on both sides of the back clamp (3); the cleaning component (43) is mounted on the second housing (46), the second drive source (48) is mounted on the second housing (46), the applicating component (44) is mounted on the third housing (47), and the third drive source (49) is mounted on the third housing (47); The input ends of the second drive source (48) and the third drive source (49) are connected to the power system, the output end of the second drive source (48) is connected to the cleaning component (43), and a third valve is installed between the second drive source (48) and the cleaning component (43); the output end of the third drive source (49) is connected to the application component (44), and a fourth valve is installed between the third drive source (49) and the application component (44).

6. A method for cleaning and applying protective coating to a connector, using the protective connector cleaning and coating device described in any one of claims 1-5, characterized in that, Specifically, the steps include the following: After the drilling is completed, the top drive body separates from the drill string; The top drive body rises, and the control system controls the back clamp (3) to drive the cleaning and coating device (4) to move upward relative to the protective connector; The control system controls the power system to supply power to the cleaning and coating device (4); The cleaning and coating device (4) cleans and applies lubricant to the protective joint; The top drive body stops rising, the top drive connects to the vertical shaft, and drilling operations begin.

7. The method for cleaning and applying protective coating to a connector according to claim 6, characterized in that, The cleaning and coating device (4) cleans and applies lubricating material to the protective joint, specifically including the following steps: The back clamp (3) moves the cleaning component (43) to the position directly opposite the thread of the protective connector, and the control system starts the top drive body to drive the protective connector to rotate; the control system starts the cleaning component (43). The back clamp (3) moves the applicator (44) to the position directly opposite the thread of the protective connector, and controls the start of the applicator (44).

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