Self-lubricating top drive pipe washing device

Abstract

According to the self-lubricating top drive pipe washing device, a distributor is in threaded connection with an automatic grease injector, the pipe washing device is arranged between a gooseneck pipe and a main shaft and is connected with the distributor through a hose, and an oil inlet communicated with the hose and a lubricating oil channel connected with the oil inlet are formed in the middle of a central pipe; the lower packing box is arranged on the lower portion of the center pipe in a sleeved mode and connected with the upper end of the main shaft through threads, at least one lower sealing base is arranged between the lower packing box and the center pipe, the lower packing is arranged between the lower sealing base and the center pipe, the lower packing is provided with a sealing cavity communicated with the oil outlet, and the lower packing expands to be tightly attached to the center pipe under the action of high-pressure mud. The upper packing box is arranged on the upper portion of the center pipe in a sleeved mode and connected with the lower end of the gooseneck pipe through threads, the upper sealing seat is arranged between the upper packing box and the center pipe, the upper sealing ring is arranged between the upper sealing seat and the gooseneck pipe, and the upper packing is arranged between the sealing seat and the center pipe. The upper packing clings to the surface of the central pipe. The device improves the lubricating efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling and workover, in particular to a top drive swab device with automatic lubrication. Background Art

[0002] At present, during the process of oil drilling operations, the high-pressure mud output by the mud pump is conveyed to the upper part of the top drive drilling device or the swivel through a hose, and then passes downward through the drill string assembly through the swab assembly to the bottom of the well, carrying the cuttings generated by drilling to the ground. The swab assembly is a very critical component, which not only needs to bear high-pressure and high-speed mud, but also undertakes the function of dynamic and static conversion.

[0003] In recent years, the digital and intelligent transformation of drilling rigs has been promoted in an orderly manner, and the operation and maintenance work of drilling rigs has been gradually replaced by machines. However, the top drive will be worn during operation and needs to be lubricated and maintained regularly to ensure its normal operation. Lubrication and maintenance work plays an important role in improving the operation efficiency and service life of equipment. The lubrication and maintenance of the existing top drive are mainly carried out manually, that is, service personnel regularly check the top drive and lubricate the top drive according to its operating status and service time. In addition, there are also some lubrication and maintenance devices with higher automation levels, which can lubricate the top drive at regular intervals according to preset programs.

[0004] Problems of the existing technology: There are some problems with the existing top drive lubrication and maintenance methods: (1) The manual lubrication and maintenance method has a large workload, low efficiency, and is prone to the problem of untimely lubrication, which may lead to increased wear of the top drive and affect its service life. (2) Although the existing automated lubrication and maintenance devices can achieve timed lubrication, they cannot lubricate according to the actual operating status of the top drive, which may lead to problems of insufficient lubrication or over-lubrication. (3) The safety fence function of intelligent devices limits the manual lubrication and maintenance cycle, and if manual intervention occurs, it will cause the stagnation of drilling rig operations. (4) Currently, the mature automatic lubrication system can only maintain static components such as pulley rollers, lifting ring pins, balance cylinders, etc., and cannot maintain rotating components such as the swab assembly. Therefore, the existing swab assembly needs to be manually greased and maintained daily. During the maintenance period, drilling operations need to be stopped, which affects the continuity of drilling operations and reduces the operation efficiency. In addition, with the development of the intelligence of drilling equipment, the manual maintenance method can no longer meet the needs of the automated operation of drilling rigs.

[0005] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present utility model, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The object of the present utility model is to provide an automatically lubricated top drive swivel joint device capable of automatically maintaining the swivel joint device of the top drive equipment of a drilling rig.

[0007] To achieve the above object, the present utility model provides the following technical solutions:

[0008] An automatically lubricated top drive swivel joint device of the present utility model includes:

[0009] An automatic grease injector,

[0010] A distributor, whose thread is connected to the automatic grease injector,

[0011] A swivel joint device, which is arranged between the gooseneck pipe and the main shaft and is connected to the distributor through a hose. The swivel joint device includes:

[0012] A central pipe, in the middle of which there is an oil inlet communicating with the hose and a lubricating oil passage connecting the oil inlet. The lubricating oil passage is provided with at least one oil outlet,

[0013] A lower packing box, which is sleeved on the lower part of the central pipe and is connected to the upper end of the main shaft through a thread,

[0014] At least one lower seal seat, which is arranged between the lower packing box and the central pipe,

[0015] A lower packing, which is arranged between the lower seal seat and the central pipe. The lower packing is provided with a sealing cavity communicating with the oil outlet. The lower packing expands under the action of high-pressure mud and tightly adheres to the central pipe,

[0016] An upper packing box, which is sleeved on the upper part of the central pipe and is connected to the lower end of the gooseneck pipe through a thread,

[0017] An upper seal seat, which is arranged between the upper packing box and the central pipe,

[0018] An upper sealing ring, which is arranged between the upper seal seat and the gooseneck pipe,

[0019] An upper packing, which is arranged between the seal seat and the central pipe. When the upper packing box and the lower end of the gooseneck pipe are threadedly connected and pre-tightened, the upper packing tightly adheres to the surface of the central pipe.

[0020] In the automatically lubricated top drive swivel joint device described above, a check valve is provided at the oil inlet.

[0021] In the automatically lubricated top drive swivel joint device described above, a circlip is provided between the upper seal seat and the central pipe.

[0022] In the automatically lubricated top drive swivel joint device described above, four lower seal seats, namely a first seal seat, a second seal seat, a third seal seat and a fourth seal seat, are arranged in sequence from top to bottom between the lower packing box and the central pipe.

[0023] In the described automatic lubrication top drive swivel device, a lower sealing ring is arranged between the fourth sealing seat and the main shaft.

[0024] In the described automatic lubrication top drive swivel device, the central tube includes an inner cylinder and an outer cylinder sleeving the inner cylinder, and a semi-circular positioning groove is arranged between the inner cylinder and the outer cylinder.

[0025] In the described automatic lubrication top drive swivel device, an O-ring seal is arranged between the inner cylinder and the outer cylinder.

[0026] In the described automatic lubrication top drive swivel device, the positioning groove is a U-shaped groove, and the length of the U-shaped groove is greater than the length of the oil outlet.

[0027] In the described automatic lubrication top drive swivel device, the lower sealing seat is provided with an inclined surface, and the lower packing deforms along the inclined surface to tightly adhere to the surface of the central tube for sealing. The upper sealing seat is provided with an inclined surface, and the upper packing deforms along the inclined surface to tightly adhere to the surface of the central tube for sealing.

[0028] In the described automatic lubrication top drive swivel device, the central tube is provided with a shoulder surface that can retract to the upper end of the lower packing box.

[0029] In the above technical solution, an automatic lubrication top drive swivel device provided by the present utility model has the following beneficial effects: The automatic lubrication top drive swivel device can lubricate the top drive swivel according to a set period or a set pressure, realizing the automation of the lubrication and maintenance of the top drive swivel, greatly improving the efficiency of lubrication and maintenance, and reducing the manual labor. It can lubricate according to the actual operating state of the top drive, avoiding the problems of insufficient lubrication or over-lubrication that may occur in the prior art due to the inability to lubricate according to the actual operating state of the top drive, achieving precise lubrication and improving the service life of the equipment. It can realize automatic lubrication and maintenance, reducing the number and time of manual lubrication and maintenance, and also reducing the consumption of grease and lubricating oil, thereby saving the cost of lubrication and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of the automatic lubrication top drive swivel device of the present utility model.

[0032] Figure 2This is a schematic cross-sectional view of the swab tube device of the automatic lubrication top drive swab tube device of the present utility model.

[0033] Figure 3 This is a schematic cross-sectional view of the integral central tube of the automatic lubrication top drive swab tube device of the present utility model.

[0034] Figure 4 This is a schematic cross-sectional view of the split central tube of the automatic lubrication top drive swab tube device of the present utility model.

[0035] The reference numerals in the figure are as follows: upper sealing ring 1, snap ring 2, upper sealing seat 3, upper packing 4, upper packing box 5, lower packing 6, first sealing seat 7, second sealing seat 8, third sealing seat 9, fourth sealing seat 10, lower packing box 11, central tube 12, lower sealing ring 13, automatic grease injector 14, distributor 15, swab tube device 16, oil inlet 17, first oil outlet 18, second oil outlet 19, inner cylinder 20, outer cylinder 21, U-shaped groove 22, O-ring 23. Detailed implementation manners

[0036] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0037] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0038] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] To enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0040] As Figures 1-4 shown, in one embodiment, an automatic lubrication top drive swab tube device of the present utility model includes

[0041] Automatic greasing device 14,

[0042] Distributor 15, which is screwed to the automatic greasing device 14,

[0043] Flushing pipe device 16, which is arranged between the gooseneck pipe and the main shaft and is connected to the distributor 15 through a hose. The flushing pipe device 16 includes,

[0044] Central pipe 12, with an oil inlet 17 communicating with the hose and a lubricating oil passage connecting the oil inlet 17 in the middle. The lubricating oil passage is provided with at least one oil outlet,

[0045] Lower packing box 11, which is sleeved on the lower part of the central pipe 12 and is connected to the upper end of the main shaft by threads,

[0046] At least one lower seal seat, which is arranged between the lower packing box 11 and the central pipe 12,

[0047] Lower packing 6, which is arranged between the lower seal seat and the central pipe 12. The lower packing 6 is provided with a sealing cavity communicating with the oil outlet. The lower packing 6 expands under the action of high-pressure mud and tightly adheres to the central pipe 12,

[0048] Upper packing box 5, which is sleeved on the upper part of the central pipe 12 and is connected to the lower end of the gooseneck pipe by threads,

[0049] Upper seal seat 3, which is arranged between the upper packing box 5 and the central pipe 12,

[0050] Upper sealing ring 1, which is arranged between the upper seal seat 3 and the gooseneck pipe,

[0051] Upper packing 4, which is arranged between the seal seat and the central pipe 12. When the upper packing box 5 is screwed to the lower end of the gooseneck pipe, the upper packing 4 tightly adheres to the surface of the central pipe 12.

[0052] In a preferred embodiment of the automatic lubrication top drive flushing pipe device, a check valve is provided at the oil inlet 17.

[0053] In a preferred embodiment of the automatic lubrication top drive flushing pipe device, a circlip 2 is provided between the upper seal seat 3 and the central pipe 12.

[0054] In a preferred embodiment of the automatic lubrication top drive flushing pipe device, four lower seal seats, namely a first seal seat 7, a second seal seat 8, a third seal seat 9 and a fourth seal seat 10, are arranged in sequence from top to bottom between the lower packing box 11 and the central pipe 12.

[0055] In a preferred embodiment of the automatic lubrication top drive flushing pipe device, a lower sealing ring 13 is provided between the fourth seal seat 10 and the main shaft.

[0056] In a preferred embodiment of the described automatic lubrication top drive swivel joint device, the central pipe 12 includes an inner cylinder 20 and an outer cylinder 21 sleeving the inner cylinder 20, and a semi-circular positioning groove is provided between the inner cylinder 20 and the outer cylinder 21.

[0057] In a preferred embodiment of the described automatic lubrication top drive swivel joint device, an O-ring seal 23 is provided between the inner cylinder 20 and the outer cylinder 21.

[0058] In a preferred embodiment of the described automatic lubrication top drive swivel joint device, the positioning groove is a U-shaped groove 22, and the length of the U-shaped groove 22 is greater than the length of the oil outlet.

[0059] In a preferred embodiment of the described automatic lubrication top drive swivel joint device, the lower seal seat is provided with an inclined surface, and the lower packing 6 deforms along the inclined surface to tightly seal against the surface of the central pipe 12. The upper seal seat 3 is provided with an inclined surface, and the upper packing 4 deforms along the inclined surface to tightly seal against the surface of the central pipe 12.

[0060] In a preferred embodiment of the described automatic lubrication top drive swivel joint device, the central pipe 12 is provided with a shoulder surface that can retract to the upper end of the lower packing box 11.

[0061] In one embodiment, an automatic lubricating top drive pipe flushing device includes an automatic greaser 14, a distributor 15, a connecting pipeline such as a hose, and a pipe flushing device 16. The automatic greaser 14 is connected to the distributor 15 via a threaded connection, and the distributor 15 is connected to the central tube 12 via a hose. The internal oil passage of the central tube 12 is connected to the packing lubrication space. The automatic greaser 14 lubricates the packing seal of the pipe flushing device 16 according to a preset maintenance cycle or pressure. The pipe flushing device 16 includes an upper packing box 5, a lower packing box 11, upper packing 4, lower packing 6, a spacer ring, a sealing assembly, a retaining ring 2, etc. The pipe flushing device 16 is disposed between the gooseneck and the main shaft. The upper packing box 5 is connected to the lower end of the gooseneck via a threaded connection, and the lower packing box 11 is connected to the upper end of the main shaft via a threaded connection. An upper sealing seat 3 and a retaining ring are provided in the upper packing box 5. An upper packing 4 is provided between the upper sealing seat 3 and the flushing pipe. An upper sealing ring 1 is provided between the upper sealing seat 3 and the gooseneck pipe. When the pre-tightened upper packing box 5 is threadedly connected to the lower end of the gooseneck pipe, the upper packing 4 deforms along the inclined surface and adheres to the surface of the central pipe 12, thereby playing a sealing role. When high-pressure mud passes through the flushing device 16, the upper packing 4 expands and adheres to the central pipe 12 under the action of the high-pressure mud, thereby playing a role in assisting well pressure sealing. Four lower sealing seats are provided from top to bottom in the lower packing box 11. Lower packing 6 is provided between adjacent lower sealing seats and the flushing pipe. A lower sealing ring 13 is provided between the fourth sealing seat 10 and the main shaft. When the pre-tightened lower packing box 11 is threadedly connected to the upper end of the main shaft, the lower packing 6 deforms along the inclined surface and adheres to the surface of the central pipe 12, thereby playing a sealing role. When high-pressure mud passes through the pipe flushing device 16, the packing expands and adheres to the central pipe 12 under the action of the high-pressure mud, playing the role of well pressure-assisted sealing.

[0062] In one embodiment, the central tube 12 comprises an inner tube 20 and an outer tube 21, which are connected by shrink fitting, interference fit, or welding. A semicircular positioning groove is provided between the inner and outer tubes 21. An O-ring 23 is provided between the inner and outer tubes 21 to prevent lubricating oil from escaping from the gap between the inner and outer tubes 21.

[0063] Embodiment 1:

[0064] like Figure 1 、 2 As shown, an embodiment of the present invention provides an automatically lubricated top drive pipe flushing device, including an automatic greaser 14, a distributor 15, and a pipe flushing device 16. The automatic greaser 14 provides grease according to a preset maintenance cycle or a preset pressure. The grease is then distributed through the distributor 15 to maintenance points on the top drive, such as the pipe flushing device 16, the pulley rollers, and the bail pins. The top drive pipe flushing device and the distributor 15 are connected by a rubber hose.

[0065] The top drive swab assembly consists of an upper packing box 5, an upper sealing ring 1, a snap ring 2, an upper sealing seat 3, an upper packing 4, an upper packing box 5, a lower packing 6, a lower packing box 11, a first sealing seat 7, a second sealing seat 8, a third sealing seat 9, a fourth sealing seat 10, a center pipe 12, and a lower sealing ring 13. The swab assembly 16 is arranged between the gooseneck pipe and the main shaft. The upper packing box 5 is connected to the lower end of the gooseneck pipe by threads, and the lower packing box 11 is connected to the upper end of the main shaft by threads.

[0066] The upper packing box 5 is provided with an upper sealing seat 3 and a retaining ring inside. An upper packing 4 is provided between the upper sealing seat 3 and the swab. An upper sealing ring 1 is arranged between the upper sealing seat 3 and the gooseneck pipe. When the upper packing box 5 is pre-tightened and thread-connected to the lower end of the gooseneck pipe, the upper packing 4 deforms along the inclined plane and tightly adheres to the surface of the center pipe 12, playing a sealing role. When high-pressure mud passes through the swab assembly 16, the upper packing 4 expands under the action of the high-pressure mud and tightly adheres to the center pipe 12, playing a role of well pressure assisted sealing.

[0067] Four lower sealing seats, namely a first sealing seat 7, a second sealing seat 8, a third sealing seat 9, and a fourth sealing seat 10, are arranged in the lower packing box 11 from top to bottom. A lower packing 6 is provided between adjacent lower sealing seats and the center pipe 12. A lower sealing ring 13 is arranged between the fourth sealing seat 10 and the main shaft. When the lower packing box 11 is pre-tightened and thread-connected to the upper end of the main shaft, the lower packing 6 deforms along the inclined plane and tightly adheres to the surface of the center pipe 12, playing a sealing role. When high-pressure mud passes through the swab assembly 16, the lower packing 6 expands under the action of the high-pressure mud and tightly adheres to the center pipe 12, playing a role of well pressure assisted sealing.

[0068] An oil inlet 17 is arranged in the middle of the center pipe 12, and a lubricating oil channel is arranged inside. A plug is arranged at the lower end of the center pipe 12. In one embodiment, the first oil outlet 18 of the lubricating oil channel is directly opposite to the first sealing cavity, and the second oil outlet 19 of the lubricating oil channel is directly opposite to the second sealing cavity. A check valve is arranged at the oil inlet 17 to prevent drilling fluid from flowing back into the grease injection system and to maintain a certain pressure in the lubricating oil channel at the same time.

[0069] In the transportation state of the top drive swab assembly, the shoulder surface of the center pipe 12 can be retracted to the upper end of the lower packing box 11. On the one hand, it reduces the length dimension of the swab assembly, and on the other hand, it reserves enough space for the installation of the swab assembly, making the installation of the swab assembly more convenient.

[0070] In order to improve the wear resistance and corrosion resistance of the center pipe 12 and make it suitable for various drilling fluids, the surface of the center pipe 12 is treated with a special tungsten carbide coating, and the hardness and surface roughness reach the smoothest surface grade.

[0071] The lower packing 6 uses imported aramid fabric laminated rubber, and a wear-resistant layer of molybdenum disulfide and graphite is sprayed on the surface, so that the sealing performance and wear resistance of the swab device 16 are greatly improved compared with the traditional swab device 16.

[0072] Embodiment 2:

[0073] In order to reduce the processing difficulty of the central pipe 12, the central pipe 12 is designed as a structure of an inner cylinder 20 plus an outer cylinder 21. A lubricating oil passage is provided on the inner cylinder 20, and an oil inlet 17, a first oil outlet 18, and a second oil outlet 19 are provided on the outer cylinder 21. The first oil outlet 18 is directly opposite to the first sealing cavity, and the second oil outlet 19 is directly opposite to the second sealing cavity.

[0074] A positioning arc is provided between the inner cylinder 20 and the outer cylinder 21 to limit the relative position between the inner and outer cylinders 21. The inner cylinder 20 and the outer cylinder 21 are connected by interference fit, or can also be connected by end welding.

[0075] In order to improve the wear resistance and corrosion resistance of the central pipe 12 and be applicable to various drilling fluids, the surface of the outer cylinder 21 is treated with a tungsten carbide coating, and the hardness and surface roughness reach the smoothest surface grade.

[0076] Embodiment 3:

[0077] As Figure 4 shown. In order to reduce the processing difficulty of the central pipe 12, the central pipe 12 can be designed as a structure of an inner cylinder 20 plus an outer cylinder 21. A lubricating oil passage is provided on the inner cylinder 20, and an oil inlet 17, a first oil outlet 18, and a second oil outlet 19 are provided on the outer cylinder 21. The first oil outlet 18 is directly opposite to the first sealing cavity, and the second oil outlet 19 is directly opposite to the second sealing cavity. A positioning arc is provided between the inner cylinder 20 and the outer cylinder 21 to limit the relative position between the inner cylinder 20 and the outer cylinder 21. The inner cylinder 20 and the outer cylinder 21 are connected by interference fit, and an O-ring 23 is provided between the inner cylinder 20 and the outer cylinder 21 to prevent the lubricating oil from overflowing from the gap between the inner and outer cylinders 21 and the external drilling fluid from entering the gap between the inner cylinder 20 and the outer cylinder 21. A U-shaped groove 22 is provided on the inner cylinder 20, and the length of the U-shaped groove 22 is greater than the lengths corresponding to the first oil outlet 18 and the second oil outlet 19.

[0078] In order to improve the wear resistance and corrosion resistance of the central pipe 12 and be applicable to various drilling fluids, the surface of the outer cylinder 21 is treated with a tungsten carbide coating, and the hardness and surface roughness reach the smoothest surface grade.

[0079] Finally, it should be noted that: the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0080] The above only describes certain exemplary embodiments of the present utility model by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present utility model.

Claims

1. An automatically lubricated top drive swivel device, characterized in that, It includes, an automatic grease injector, a dispenser, which is screwed to the automatic grease injector, a flushing pipe device, which is arranged between the gooseneck pipe and the main shaft and is connected to the dispenser through a hose. The flushing pipe device includes, a central pipe, in the middle of which there is an oil inlet communicating with the hose and a lubricating oil passage connecting the oil inlet. The lubricating oil passage is provided with at least one oil outlet, a lower packing box, which is sleeved on the lower part of the central pipe and is connected to the upper end of the main shaft by a thread, at least one lower seal seat, which is arranged between the lower packing box and the central pipe, a lower packing, which is arranged between the lower seal seat and the central pipe. The lower packing is provided with a sealing cavity communicating with the oil outlet. The lower packing expands under the action of high-pressure mud and tightly adheres to the central pipe, an upper packing box, which is sleeved on the upper part of the central pipe and is connected to the lower end of the gooseneck pipe by a thread, an upper seal seat, which is arranged between the upper packing box and the central pipe, an upper sealing ring, which is arranged between the upper seal seat and the gooseneck pipe, an upper packing, which is arranged between the seal seat and the central pipe. When the upper packing box is screwed to the lower end of the gooseneck pipe, the upper packing tightly adheres to the surface of the central pipe.

2. The automatic lubricating top drive swivel device according to claim 1, characterized in that, A check valve is arranged at the oil inlet.

3. An automatically lubricated top drive swivel device according to claim 1, characterized in that, A circlip is arranged between the upper seal seat and the central pipe.

4. An automatic lubrication top drive swivel device according to claim 1, characterized in that, Four lower seal seats, namely a first seal seat, a second seal seat, a third seal seat and a fourth seal seat, are arranged in sequence from top to bottom between the lower packing box and the central pipe.

5. An automatically lubricated top drive swivel device according to claim 4, characterized in that, A lower sealing ring is arranged between the fourth seal seat and the main shaft.

6. The automatic lubricating top drive swivel device according to claim 1, wherein The central pipe includes an inner cylinder and an outer cylinder sleeving the inner cylinder. A semi-circular positioning groove is arranged between the inner cylinder and the outer cylinder.

7. An automatic lubrication top drive swivel device according to claim 6, characterized in that, An O-ring is arranged between the inner cylinder and the outer cylinder.

8. An automatically lubricated top drive swivel device according to claim 6, characterized in that, The positioning groove is a U-shaped groove, and the length of the U-shaped groove is greater than the length of the oil outlet.

9. An automatically lubricated top drive swivel device according to claim 1, characterized in that, The lower seal seat is provided with an inclined surface, and the lower packing deforms along the inclined surface and tightly adheres to the surface of the central pipe for sealing. The upper seal seat is provided with an inclined surface, and the upper packing deforms along the inclined surface and tightly adheres to the surface of the central pipe for sealing.

10. The automatic lubricating top drive swivel device according to claim 1, characterized in that, The central pipe is provided with a shoulder surface that can be retracted to the upper end of the lower packing box.

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