A top drive casing device

Abstract

This invention discloses a top-drive casing lowering device, including a power head. The power head includes a main shaft, and a push-pull sleeve is fitted onto the lower part of the main shaft. The push-pull sleeve is connected to one end of a cylindrical cylinder via a bearing, and the other end of the cylinder is supported on the main shaft via a bearing. The lower end of the main shaft engages with the upper main shaft thread on the upper side of the casing clamping device. H-shaped swing arms are provided on the left and right sides of the casing clamping device. The H-shaped swing arms are hinged to swing arm seats via swing arm ear plates. The swing arm seats include two symmetrically arranged Ω-shaped retaining rings. Each Ω-shaped retaining ring has horizontal connecting plates at its front and rear ends, and a connecting seat is provided on the outer wall of the arc apex of the Ω-shaped retaining ring. A swing arm hydraulic cylinder is hinged between the connecting seat and the H-shaped swing arm. This invention is equipped with a swing arm hydraulic cylinder and a hydraulic clamp, resulting in a high degree of automation in pipe handling, reducing the labor intensity of operators, improving operational safety, and good applicability to different platform operations, thus well meeting the needs of casing lowering operations.

Description

Technical Field

[0001] This invention relates to the field of oil drilling equipment technology, and in particular to a top drive casing installation device. Background Technology

[0002] Casing installation is a crucial step in drilling operations. Its purpose is to isolate formations, reinforce the wellbore, prevent oil and gas leaks, and establish flow channels for oil and gas. The installed casing plays a vital role in both function and well construction costs, making it an indispensable part of oil and gas development. Unreliable casing installation can have serious consequences, ranging from affecting cementing quality, oil production, and the lifespan of the well and casing, to endangering the lives of personnel involved in the installation, damaging oil and gas resources, and even leading to the abandonment of the well.

[0003] Conventional casing running operations involve using heavy-duty hoists, casing straightening platforms, casing wrenches, and separate grouting equipment for casing insertion and grouting. However, existing conventional casing running operations have several shortcomings: the process is complex, the ability to handle casing jamming accidents is low, the number of supporting equipment and personnel is large, the operation efficiency is low, and there are significant safety hazards. Especially with the increasing intensity and difficulty of oil and natural gas exploration and development, unconventional drilling methods such as horizontal wells, extended reach wells, multi-branch wells, and underbalanced wells have become the main means of conventional / unconventional oil and gas development. Drilling and production conditions are becoming increasingly complex, making casing running operations particularly complex. Conventional casing running operations are prone to jamming and casing obstruction, making it difficult to run the casing to the target position, resulting in low efficiency, high operating costs, and significant safety hazards, leading to a continuous increase in oil and natural gas development costs. Therefore, how to safely and efficiently achieve casing running operations while reducing costs has become the development direction and driving force for casing running equipment.

[0004] Top-drive casing running equipment is a new type of casing running operation device. This device fully leverages the advantages of top-drive drilling during casing running operations, possessing the ability to rotate the casing and circulate drilling fluid. It can precisely control the turn-on torque, reducing frictional resistance during casing insertion and significantly lowering the probability of operational accidents such as casing obstruction and jamming. This greatly improves the success rate of casing insertion, effectively avoiding complex downhole situations and providing technical support for challenging downhole casing operations such as deep wells with large reach. Simultaneously, the use of this equipment reduces the number of personnel required, alleviating their labor intensity, and features safety, high efficiency, and convenient installation. Currently, top-drive casing running equipment has become a prerequisite for domestic and international oilfield service companies to secure international casing running operation orders. Developing such equipment at this stage can promptly narrow the technological gap with foreign manufacturers, enabling top-drive casing running technology to play a greater role in my country's oil drilling industry. Summary of the Invention

[0005] The purpose of this invention is to provide a top-drive casing running device to solve the problems encountered when using traditional casing running devices. These problems include difficulty in accurately controlling the casing threading torque, high casing running resistance, difficulty in running the casing to the target point, bulky and numerous equipment involved in the operation, low automation, complex and time-consuming equipment switching between different operation stages, and significant safety hazards during traditional casing running operations. Traditional casing running equipment and methods are increasingly unable to meet the requirements of casing running operations in challenging wells such as deep wells with large reach.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A top-drive lower sleeve device includes a vertically arranged power head, the power head including a main shaft, a push-pull sleeve fitted on the lower part of the main shaft, the end of the push-pull sleeve having an annular groove, the push-pull sleeve being connected to one end of a cylindrical cylinder body via a bearing, the other end of the cylinder body being supported on the main shaft via a bearing, a stepped end cap provided on the right end of the cylinder body, the end cap being fitted on the main shaft; a thread is machined on the inner circumference of the lower end of the main shaft, the thread engaging with the upper main shaft thread on the upper side of the sleeve clamping device, the left and right sides of the sleeve clamping device are provided with structurally symmetrical H-shaped swing arms, each swing arm consisting of an outer arm located on the upper side. The arm is fitted together with the inner arm located on the lower side. A connecting beam connects the two swing arms. Wear-resistant plates connected to the inner side of the outer arm are provided on the left and right ends of the connecting beam. Swing arm ear plates welded to the end of the outer arm are provided on the upper side of the wear-resistant plates. The swing arm ear plates on the left and right sides are respectively hinged to the swing arm seat fitted on the outer circumference of the end cover. The swing arm seat includes two Ω-shaped retaining rings symmetrically arranged on the left and right. Each Ω-shaped retaining ring has horizontal connecting plates at its front and rear ends. The two connecting plates are connected by bolts. A connecting seat is provided on the outer wall of the arc top of the Ω-shaped retaining ring. A swing arm hydraulic cylinder is hinged between the connecting seat and the H-shaped swing arm.

[0008] Preferably, the inner connecting plate of the Ω-shaped retaining ring is symmetrically provided with two upright square groove sliding brackets on its outer wall. The bottom of the sliding bracket groove is provided with a slider. An anti-torque frame is installed in the sliding groove formed by the two symmetrically arranged sliding brackets. The anti-torque frame slides in the sliding groove through the slider.

[0009] Preferably, the anti-torque frame includes an array of torque beams connected end to end in sequence. The top side of the torque beam is bolted to one end of the mounting base. The other end of the mounting base has an arc-shaped through hole. An array of mounting holes are evenly distributed along the circumference inside the arc-shaped through hole. The mounting holes are bolted to the top drive back clamp.

[0010] Preferably, there is a gap of several millimeters between the left and right connecting plates.

[0011] Preferably, the side wall of the connecting seat is provided with a swing arm mounting hole and the bottom is provided with a swing arm hydraulic cylinder mounting hole.

[0012] Preferably, the cylinder body has several oil ports, and the end cap is connected to a connecting pipeline.

[0013] Preferably, the upper end of the sleeve holding device is connected to a lifting cylinder, the upper end of the lifting cylinder is provided with an annular groove, the annular groove is nested on the second protrusion at the lower end of the sleeve, the upper part of the sleeve is provided with a first protrusion, and the first protrusion is engaged in the groove.

[0014] Preferably, the outer sides of the H-shaped swing arm are equipped with protective covers, and power pipelines are installed inside the protective covers.

[0015] Preferably, the inner arm has an array of adjustment holes, the size of which is consistent with the pin holes on the outer arm, and a pin passes through both the adjustment holes and the pin holes.

[0016] The process of using this invention is as follows:

[0017] The above-described top-drive casing lowering device handles the casing lowering operation process as follows:

[0018] During the casing installation, the power head spindle and the top drive spindle are connected by threads. The anti-torque frame is connected to the bottom of the top drive back clamp via a mounting base. The position of the inner arm relative to the outer arm is adjusted by the adjustment hole on the inner arm of the H-shaped swing arm. The overall length of the H-shaped swing arm is adjusted to a suitable working position and fixed with a pin. The number of torque beams connected to the anti-torque frame is adjusted according to the distance between the back clamp and the swing arm seat.

[0019] After the catwalk transports a single casing to the drilling platform, the swing arm hydraulic cylinder extends, causing the H-shaped swing arm to swing at a certain angle and carry the hydraulic clamp to the casing joint. Then, the hydraulic clamp opens and clamps the single casing joint under the action of hydraulic power.

[0020] After the hydraulic chuck clamps the single casing joint, the driller controls the top drive to move upwards along the track onto the derrick. At this time, the single casing joint gradually stands up and moves to the center line of the derrick wellhead under the action of the H-shaped boom and the hydraulic chuck. When the bottom of the single casing joint is higher than the height of the wellhead casing pile, the driller stops the top drive lifting and controls the top drive to lower, placing the lower casing joint onto the upper joint of the wellhead casing pile.

[0021] The top drive continues to descend, and the invention descends along with it until the grouting sealing device of the casing clamping device is inserted into the casing at a certain position. The descent of the top drive stops, and the power head injects pressurized oil through the oil port, causing the cylinder to move downwards. Due to the tight connection between the push-pull sleeve and the cylinder, the push-pull sleeve also moves downwards. The clamping sleeve, through the first and second bosses, respectively clamps into the grooves of the push-pull sleeve and the lifting cylinder. As the push-pull sleeve moves downwards, under the action of the clamping sleeve, the lifting cylinder also moves downwards and, through the clamping pads in the casing clamping device, holds the casing tightly. As the cylinder moves downwards, the rocker arm seat slides along the anti-torque frame under the guidance of the sliding bracket and the slider. At this time, the lubricating oil pressure in the upper and lower lubrication chambers of the power head is balanced through the connecting pipeline.

[0022] After the casing clamping device secures the casing with its slips, the top drive rotation function is activated. The top drive spindle drives the spindle of the power head of this invention to rotate, performing the upper clamping operation. At this time, due to the limiting effect of the anti-torque frame, the end cover and cylinder are stationary relative to the ground under the isolation of the support bearing. When the upper clamping torque reaches the casing upper clamping set value, the top drive spindle stops rotating, completing the upper clamping operation. Afterward, the turntable slips open, and this invention drives the entire casing string to move downward. To ensure the smooth lowering of the entire casing string, during the lowering process, mud circulation can be performed through the mud channel on the spindle of this invention and the grouting sealing device of the casing clamping device, or the top drive rotation function can be activated simultaneously, using this invention to drive the entire casing string to rotate.

[0023] When the casing is lowered to the predetermined depth, the power head injects pressurized oil through the oil port, causing the cylinder, push-pull sleeve, and end cap to move upwards. This, in turn, moves the lifting cylinder upwards via the clamping sleeve, releasing the casing clamping device from the casing. As the cylinder moves upwards, the rocker arm seat slides along the anti-torque frame under the guidance of the left and right sliding brackets and the slider. At this time, the lubricating oil pressure in the power head's lubrication chamber is balanced through the connecting pipeline.

[0024] The top drive is raised to remove the grouting and sealing device of the casing clamping device of the present invention from the casing cavity. Then, the hydraulic system controls the hydraulic clamp to open, and the H-shaped swing arm swings at a certain angle under the action of the swing arm hydraulic cylinder, moving it out of the wellhead centerline position and preparing for the lowering of the next casing.

[0025] The process of retrieving the casing is the reverse of the process of lowering it in, and will not be described in detail here.

[0026] The beneficial effects of this invention are as follows:

[0027] (1) The swing arm seat in this invention is a split structure, and integrates the swing arm, sliding bracket and swing arm hydraulic cylinder into one unit. The structure is simple and compact, and it is easy to install and maintain on site.

[0028] (2) In this invention, the mounting base and torque beam of the anti-torque bracket are separate structures. By replacing the mounting base with different specifications, the connection requirements of different models of top drives can be met. The torque beam is multi-segmented, and the individual torque beams are connected by hinged hole bolts. By adjusting the number of connected torque beam segments, the applicability of the anti-torque bracket to different models of top drives can be improved.

[0029] (3) The swing arm in this invention is telescopic. The length of the swing arm can be adjusted by adjusting the relative position of the inner arm to the outer arm, making it highly adaptable to different catwalk models and different installation positions of the catwalk. In addition, the outer arm is designed with a lifting clamp power pipeline and a protective cover, which can provide power to the hydraulic lifting clamp and protect the hydraulic pipeline, making the whole set of equipment highly reliable.

[0030] (4) The top drive casing device of the present invention is equipped with a swing arm hydraulic cylinder and a hydraulic lifting clamp, which has a high degree of automation in pipe handling, can reduce the labor intensity of operators and improve the safety of operation.

[0031] (5) The top drive casing device of the present invention has casing clamping, casing uncoupling and mud circulation functions, etc. It has powerful operation functions and high equipment versatility. It is suitable for different platform operations and can well meet the needs of casing operation. Attached Figure Description

[0032] Figure 1 This is an overall isometric view of the present invention.

[0033] Figure 2 This is an overall front view of the present invention.

[0034] Figure 3 This is a schematic diagram of the power head of the present invention.

[0035] Figure 4 This is a schematic diagram of the sleeve holding device of the present invention.

[0036] Figure 5 This is a schematic diagram of the swing arm seat of the present invention.

[0037] Figure 6 for Figure 5 Partial A view in the middle.

[0038] Figure 7 This is a schematic diagram of the anti-torque frame of the present invention.

[0039] Figure 8 for Figure 7 A partial B-view.

[0040] Figure 9 for Figure 7 A partial C view.

[0041] Figure 10This is a schematic diagram of the swing arm of the present invention.

[0042] Figure 11 for Figure 10 A partial D-view.

[0043] In the diagram: 1-Power head, 101-Push-pull sleeve, 102-Groove, 103-Cylinder body, 104-End cover, 105-Main shaft, 106-Thread, 107-Connecting pipeline, 108-Oil port, 109-Mulch channel, 2-Flange, 201-Boss 1, 202-Boss 2, 3-Lifting cylinder, 4-Swing arm seat, 401-Sliding bracket, 402-Slider, 403-Connecting seat, 404-Swing arm hydraulic cylinder mounting hole, 405-Swing arm mounting hole, 406-Ω 407-Connecting plate, 5-Sleeve clamping device, 501-Upper spindle thread, 6-Anti-torque bracket, 601-Mounting seat, 602-Torque beam, 603-Mounting hole, 604-Arc-shaped through hole, 605-Reamed hole bolt, 7-H-type swing arm, 701-Outer arm, 702-Guard cover, 703-Inner arm, 704-Adjusting hole, 705-Pin, 706-Connecting beam, 707-Wear-resistant plate, 708-Swing arm ear plate, 8-Hydraulic lifting clamp, 9-Swing arm hydraulic cylinder. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings.

[0045] like Figure 1-11The illustrated top-drive lower sleeve device includes a vertically arranged power head 1. The power head 1 includes a main shaft 105, and a push-pull sleeve 101 is fitted onto the lower part of the main shaft 105. An annular groove 102 is formed at the end of the push-pull sleeve 101. The push-pull sleeve 101 is connected to one end of a cylindrical cylinder 103 via a bearing. The other end of the cylinder 103 is supported on the main shaft 105 via a bearing. A stepped end cap 104 is provided at the right end of the cylinder 103, and the end cap 104 is fitted onto the main shaft 105. Several... An oil port 108 is provided, and a connecting pipeline 107 is connected to the end cap 104. A thread 106 is machined on the inner circumference of the lower end of the main shaft 105. The thread 106 meshes with the upper main shaft thread 501 on the upper side of the sleeve clamping device 5. Symmetrical H-shaped swing arms 7 are provided on the left and right sides of the sleeve clamping device 5. Each swing arm 7 is formed by an outer arm 701 on the upper side and an inner arm 703 on the lower side fitting together. A connecting beam 706 connects the two swing arms. The left and right ends of the connecting beam 706 are provided with connections to the outer arm 701. 1. A wear-resistant plate 707 is connected to the inner side. The upper side of the wear-resistant plate 707 is provided with a swing arm ear plate 708 welded to the end of the outer arm 701. The swing arm ear plates 708 on the left and right sides are respectively hinged to the swing arm seat 4 fitted on the outer circumference of the end cover 104. The swing arm seat 4 includes two symmetrically arranged Ω-shaped retaining rings 406 on the left and right. The front and rear ends of each Ω-shaped retaining ring 406 are respectively provided with horizontal connecting plates 407. The two connecting plates 407 on the left and right sides are connected by bolts and maintain a 5mm gap. The outer wall of the arc top of the Ω-shaped retaining ring 406 A connecting seat 403 is provided at the location. The side wall of the connecting seat 403 is provided with a swing arm mounting hole 405, and the bottom is provided with a swing arm hydraulic cylinder mounting hole 404. The connecting seat 403 is hinged to the H-shaped swing arm 7 through the swing arm mounting hole 405. The outer arm 701 of the H-shaped swing arm 7 is equipped with a protective cover 702 on both sides. The power pipeline passes through the inside of the protective cover 702. An array of adjustment holes 704 is opened on the inner arm 703. The size of the adjustment hole 704 is consistent with the pin hole on the outer arm 701. The pin 705 passes through both the adjustment hole 704 and the pin hole.

[0046] The inner connecting plate 407 of the Ω-shaped retaining ring 406 is symmetrically provided with two upright square groove sliding brackets 401 on the outer wall. The bottom of the sliding bracket 401 is provided with a slider 402. The anti-torque frame 6 is installed in the sliding groove formed by the two symmetrically arranged sliding brackets 401. The anti-torque frame 6 slides in the sliding groove through the slider 402.

[0047] The anti-torque frame 6 includes an array of torque beams 602 connected end to end. The top side of the torque beams 602 is bolted to one end of the mounting base 601. The other end of the mounting base 601 has an arc-shaped through hole 604. An array of mounting holes 603 are evenly distributed along the circumference inside the arc-shaped through hole. The mounting holes 603 are bolted to the top drive back clamp.

[0048] The upper end of the sleeve holding device 5 is connected to the lifting cylinder 3. The upper end of the lifting cylinder 3 is provided with an annular groove. The annular groove is nested on the second protrusion 202 at the lower end of the sleeve 2. The upper part of the sleeve 2 is provided with a first protrusion 201, which is engaged in the groove 102.

[0049] The process of using this invention:

[0050] The above-described top-drive casing lowering device handles the casing lowering operation process as follows:

[0051] During the casing installation, the power head spindle 105 is connected to the top drive spindle via thread 106, and the anti-torque frame 6 is connected to the bottom of the top drive back clamp via mounting base 601. The position of the inner arm 703 relative to the outer arm 701 is adjusted via the adjustment hole 704 on the inner arm 703 of the H-type swing arm 7, so that the overall length of the H-type swing arm 7 is adjusted to a suitable working position and fixed with pin 705. The number of torque beams 602 connected to the anti-torque frame 6 is adjusted according to the distance between the back clamp and the swing arm seat 4.

[0052] After the catwalk transports a single casing to the drilling platform, the swing arm hydraulic cylinder 9 extends, causing the H-shaped swing arm 7 to swing at a certain angle and carry the hydraulic lifting clamp 8 to the casing joint. Then, the hydraulic lifting clamp 8 opens and clamps the single casing joint under the action of hydraulic power.

[0053] After the hydraulic jack 8 clamps the single casing joint, the driller controls the top drive to move upwards along the track to the derrick. At this time, the single casing gradually stands up and moves to the center line of the derrick wellhead under the action of the H-shaped swing arm 7 and the hydraulic jack 8. When the bottom of the single casing is higher than the height of the wellhead casing pile, the driller stops the top drive lifting and controls the top drive to lower, placing the lower casing joint onto the upper joint of the wellhead casing pile.

[0054] The top drive continues to descend, and the invention descends along with the top drive until the grouting sealing device of the sleeve holding device 5 is inserted into the sleeve at a certain position. The descent of the top drive stops, and the power head 1 injects pressurized oil through the oil port 108, causing the cylinder 103 to move downwards. Because the push-pull sleeve 101 is tightly connected to the cylinder 103, the push-pull sleeve 101 also moves downwards. The clamping sleeve 2 is respectively clamped in the groove 102 of the push-pull sleeve 101 and the groove of the lifting cylinder 3 by the first boss 201 and the second boss 202. When the push-pull sleeve 101 moves downwards, under the connecting action of the clamping sleeve 2, the lifting cylinder 3 also moves downwards and is held tightly by the clamping pads in the sleeve holding device 5. When the cylinder 103 moves downwards, the swing arm seat 4 slides along the anti-torque frame 6 under the guidance of the sliding bracket 401 and the slider 402. At this time, the lubricating oil pressure in the upper and lower lubrication chambers of the power head 1 is balanced by the connecting pipeline 107.

[0055] After the casing clamping device 5 holds the casing tightly with the clamps, the top drive rotation function is activated. The top drive spindle drives the spindle 105 of the power head 1 of this invention to rotate, performing the upper clamping operation. At this time, due to the limiting effect of the anti-torque frame 6, the end cover 104 and cylinder 103 remain stationary relative to the ground under the isolation of the support bearing. When the upper clamping torque reaches the casing upper clamping set value, the top drive spindle stops rotating, completing the upper clamping operation. Afterward, the turntable clamps open, and this invention drives the entire casing string to move downward. To ensure that the entire casing string can be lowered smoothly, during the lowering process, mud circulation can be performed through the mud channel 109 on the spindle of this invention and the grouting sealing device of the casing clamping device 5, or the top drive rotation function can be activated simultaneously, using this invention to drive the entire casing string to rotate.

[0056] When the casing is lowered to the predetermined depth, the power head 1 injects pressurized oil through the oil port 108, causing the cylinder 103, push-pull sleeve 101, and end cap 104 to move upwards. This, in turn, drives the lifting cylinder 3 upwards via the clamping sleeve 2, releasing the casing clamping device 5 from the casing. As the cylinder 103 moves upwards, the rocker arm seat 4 slides along the anti-torque frame 6 under the guidance of the left and right sliding brackets 401 and the slider 402. At this time, the lubricating oil pressure in the lubrication chamber of the power head 1 is balanced through the connecting pipeline 107.

[0057] The top drive is raised to remove the grouting and sealing device of the casing clamping device 5 of the present invention from the casing cavity. Then, the hydraulic lifting clamp 8 is opened by controlling the hydraulic system, and the H-shaped swing arm 7 swings at a certain angle under the action of the swing arm hydraulic cylinder 9, moving out of the wellhead centerline position and preparing for the lowering of the next casing.

[0058] The process of retrieving the casing is the reverse of the process of lowering it in, and will not be described in detail here.

[0059] In this invention, the swing arm seat is a split structure, integrating the swing arm, sliding bracket, and swing arm hydraulic cylinder into one unit. The structure is simple and compact, facilitating on-site installation and maintenance. The mounting base and torque beam of the anti-torque bracket are also separate structures. By replacing mounting bases of different specifications, the connection requirements of different top drive models can be met. The torque beam is multi-segmented, with individual torque beam segments connected by reamed hole bolts. Adjusting the number of connected torque beam segments allows for increased efficiency. This invention is equipped with a swing arm hydraulic cylinder and hydraulic clamp, resulting in a high degree of automation in pipe handling, reducing worker workload and improving operational safety. This invention features casing clamping, casing uncoupling, and mud circulation functions, offering powerful operational capabilities and high equipment versatility. It is suitable for different platform operations and effectively meets the needs of casing installation.

[0060] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, based on the technical teachings provided by the present invention and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of the present invention.

Claims

1. A top drive casing lowering apparatus, characterized by: The utility model relates to a power head (1) is arranged vertically, the power head (1) includes the main shaft (105), the lower part of main shaft (105) is sleeved with push -and -pull sleeve (101), the end of push -and -pull sleeve (101) is provided with annular recess (102), push -and -pull sleeve (101) is connected with one end of cylindrical cylinder body (103) through bearing, the other end of cylinder body (103) is supported to main shaft (105) through bearing, the right side end of cylinder body (103) is equipped with stepped end cover (104), and end cover (104) is sleeved on main shaft (105), the inner circumference of the lower end of main shaft (105) is processed with screw thread (106), and screw thread (106) is engaged with the upper main shaft screw thread (501) on the upper side of sleeve holding device (5), and the left and right sides of sleeve holding device (5) are provided with the symmetrical H type swing arm (7) of structure, the both sides swing arm of H type swing arm (7) is formed by the mutual sleeve of the outer arm (701) of the upper side and the inner arm (703) of the lower side, and the connecting beam (706) is connected between the both sides swing arm, and the wear plate (707) that is connected with the inner side of outer arm (701) is equipped on the left and right end of connecting beam (706), the upper side of wear plate (707) is equipped with the swing arm lug plate (708) that is welded with the end of outer arm (701), and the swing arm lug plate (708) of left and right sides is respectively hinged with the swing arm seat (4) that is sleeved on the outer circumference of end cover (104), and swing arm seat (4) includes two left and right symmetrical omega-shaped snap rings (406), and the front and rear ends of each omega-shaped snap ring (406) are respectively equipped with horizontal connecting plate (407), and the left and right two connecting plates (407) are bolted together, and the arc top outer wall of omega-shaped snap ring (406) is equipped with connecting seat (403), and swing arm hydraulic cylinder (9) is hinged between connecting seat (403) and H type swing arm (7). The outer wall of the inner connecting plate (407) of omega-shaped snap ring (406) is symmetrically provided with two vertical square groove-shaped sliding supports (401), the sliding supports (401) are provided with sliding blocks (402) at the groove bottoms, and the sliding groove formed by the two symmetrically arranged sliding supports (401) is provided with an anti-torque frame (6), and the anti-torque frame (6) slides in the sliding groove through the sliding blocks (402). The anti-torque frame (6) includes a plurality of torque beams (602) connected in sequence, the torque beams (602) are connected to one end of a mounting seat (601) through bolts, the other end of the mounting seat (601) is provided with an arc-shaped through hole (604), a plurality of mounting holes (603) are uniformly distributed on the inner side of the arc-shaped through hole along the circumference, and the mounting holes (603) are connected to the top drive back tongs through bolts.

2. A top drive casing lowering apparatus as claimed in claim 1, wherein: The left and right connecting plates (407) have a gap of several millimeters.

3. A top drive casing lowering apparatus according to claim 1 or 2, wherein: The side wall of the connecting seat (403) is provided with a swing arm mounting hole (405), and the bottom is provided with a swing arm hydraulic cylinder mounting hole (404).

4. A top drive casing lowering apparatus as claimed in claim 3, wherein: A plurality of oil ports (108) are formed on the cylinder body (103), and the end cover (104) is connected with a connecting pipeline (107).

5. A top drive casing lowering apparatus as claimed in claim 4, wherein: The upper end of the sleeve clamping device (5) is connected with a lifting cylinder (3), the upper end of the lifting cylinder (3) is provided with an annular groove, the annular groove is nested on the second boss (202) at the lower end of the sleeve (2), the upper part of the sleeve (2) is provided with a first boss (201), and the first boss (201) is clamped on the groove (102).

6. A top drive casing lowering apparatus as claimed in claim 5, wherein: The outer arm (701) of the H-shaped swing arm (7) is provided with a shield (702) on both sides, and a power pipeline is arranged in the shield (702).

7. A top drive casing lowering apparatus as claimed in claim 6, wherein: A plurality of adjusting holes (704) are formed in the inner arm (703), the adjusting holes (704) are consistent in size with pin shaft holes on the outer arm (701), and a pin shaft (705) is arranged in the adjusting holes (704) and the pin shaft holes.

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