A large-diameter suspension device with a diameter-to-thickness ratio exceeding 8 and related service tools

Abstract

This invention discloses a large-diameter suspension device with a diameter-to-thickness ratio exceeding 8 and a matching service tool. The device includes a suspension device and a service tool. The service tool includes a central tube connected at one end to an upper connector and at the other end to a ball seat connecting sleeve. Externally fitted on the central tube are a control piston, a force transmission sleeve, a reverse claw spring, a release limit sleeve, and a lower force transmission sleeve. The ball seat connecting sleeve connects to the ball seat. The service tool hydraulic cylinder is fitted outside the upper connector and the control piston. The suspension device includes a central tube fitted outside the service tool. Externally fitted on the central tube are a sealing cylinder, an upper cone, a cylindrical slip, a lower cone, an upper pressure cap for the rubber sleeve, a rubber sleeve mechanism, a lower pressure cap for the rubber sleeve, a sealing sleeve, a rubber sleeve locking ring pressure cap, and a lower connector. One end of the sealing cylinder is connected to the sealing cylinder pressure cap. The functional components of this invention are integrated into the service tool, which is not limited by size, ensuring structural strength and reliability. The suspension device only retains the suspension and sealing function, resulting in a simple and compact structure that meets various large-diameter operation requirements.

Description

Technical Field

[0001] This invention belongs to the field of suspension devices, specifically relating to a large-diameter suspension device with a diameter-to-thickness ratio exceeding 8 and related service tools. Background Technology

[0002] Currently, most existing hydraulic setting hangers have the hydraulic system designed on the hanger body. The hanger body has limited space, and coupled with the complex structure, it is prone to problems during use. Furthermore, the overly complex structure seriously affects the hanger's diameter. Conventional hangers cannot handle well completion operations such as expansion screen pipe or expansion tube completions, which require the later installation of large-diameter expansion cones to increase the diameter. The small diameter also brings greater risks to later operations. Summary of the Invention

[0003] This invention is proposed to overcome the shortcomings of the prior art, and its purpose is to provide a large-diameter suspension with a diameter-to-thickness ratio exceeding 8 and supporting service tools.

[0004] This invention is achieved through the following technical solution:

[0005] A large-diameter hanger with a diameter-to-thickness ratio exceeding 8 and a matching service tool, comprising a hanger and a service tool, wherein the service tool includes a service tool center tube, one end of which is connected to an upper connector and the other end of which is connected to a ball seat connecting sleeve, and a control piston, a force transmission sleeve, a reverse claw spring, a release limit sleeve and a lower force transmission sleeve are sequentially fitted outside the service tool center tube, the ball seat connecting sleeve is connected to a ball seat, and the service tool hydraulic cylinder is fitted outside the upper connector and the control piston;

[0006] The hanger includes a hanger center tube, which is sleeved on the outside of the service tool. A sealing cylinder, an upper cone, a cylindrical slip, a lower cone, an upper pressure cap for the rubber tube, a rubber tube mechanism, a lower pressure cap for the rubber tube, a sealing sleeve, a rubber tube locking ring pressure cap, and a lower connector are sequentially sleeved on the outside of the hanger center tube. The end of the sealing cylinder near the upper connector is connected to the sealing cylinder pressure cap.

[0007] In the above technical solution, one end of the upper connector forms a convex ring, and the end of the control piston near the convex ring forms an annular groove. The convex ring is inserted into the groove and fixedly connected by a shear pin. The upper connector is threadedly connected to the service tool center tube, and the service tool cylinder is threadedly connected to the upper connector. The ball seat connecting sleeve is threadedly connected to the service tool center tube, and the ball seat connecting sleeve is threadedly connected to the ball seat.

[0008] In the above technical solution, the upper force transmission sleeve has a locking block hole at one end near the upper connector, and multiple slots are evenly distributed around the other end; the upper connector has a locking groove at the position corresponding to the locking block hole, the locking block is placed in the locking block hole and the lower end extends into the locking groove, the control piston is sleeved on the outside of the upper force transmission sleeve at one end near the upper force transmission sleeve and presses on the locking block; the lower force transmission sleeve is fixed to the service tool center tube by a shear pin; the T-shaped seat key fits the lower force transmission sleeve and is fixed to the seat key by the seat shear pin.

[0009] In the above technical solution, the reverse claw spring is located at the upper part of the service tool center tube, and the two are connected by a threaded connection; the large diameter part of the release limit sleeve is inserted into the slotted thread of the reverse claw spring, and the release limit sleeve and the service tool center tube are fixed by a shear pin.

[0010] In the above technical solution, a shear pin hole is formed on the lower force transmission sleeve, and a shear pin hole is also formed at the lower part of the service tool center tube. The shear pin passes through the shear pin hole on the lower force transmission sleeve and the service tool center tube to fix the lower force transmission sleeve and the service tool center tube. The T-shaped setting key fits against the lower force transmission sleeve, and the lower force transmission sleeve and the setting key are fixed by the setting shear pin. The suspension center tube is milled with an axial groove at the position where it mates with the lower force transmission sleeve. The small end of the T-shaped section of the setting key passes through the groove and connects to the lower force transmission sleeve.

[0011] In the above technical solution, the end of the central tube of the hanger near the upper connector is threadedly connected to the reverse thread of the reverse claw spring; the lower connector is threadedly connected to the central tube of the hanger; one end of the sealing cylinder pressure cap is sleeved outside the lower end of the force transmission sleeve, and the other end is sleeved outside the sealing cylinder and threadedly connected to the sealing cylinder.

[0012] In the above technical solution, one end of the upper cone is inserted into the cylindrical slip, and the other end is inserted into the sealing cylinder. The upper cone and the sealing cylinder are threaded together, and a slip locking ring is provided between the end of the upper cone and the sealing cylinder.

[0013] In the above technical solution, the lower cone and the pressure cap on the rubber sleeve are both threadedly connected to the central pipe of the hanger.

[0014] In the above technical solution, the rubber tube mechanism includes a sealing rubber tube and a rubber tube inner skeleton embedded inside the sealing rubber tube. The two ends of the sealing rubber tube are provided with a metal braided mesh and an elastic protective sleeve from the inside to the outside. One end of the rubber tube mechanism is inserted into the inner groove of the upper pressure cap of the rubber tube, and the other end is inserted into the lower pressure cap of the rubber tube.

[0015] In the above technical solution, one end of the sealing sleeve is fitted outside the lower pressure cap of the rubber tube, and the other end is inserted into the locking ring pressure cap of the rubber tube. The sealing sleeve, the lower pressure cap of the rubber tube, and the locking ring pressure cap of the rubber tube are all connected by threads, and the rubber tube locking ring is embedded between the end of the sealing sleeve and the locking ring pressure cap of the rubber tube; the upper inner wall of the sealing sleeve forms an enlarged diameter space to accommodate the seated sliding key.

[0016] The beneficial effects of this invention are:

[0017] This invention provides a large-diameter suspension with a diameter-to-thickness ratio exceeding 8 and a matching service tool. The suspension seat seal hydraulic power transmission system, hydraulic and mechanical dual release system, and anti-slip control system are integrated into the service tool. The service tool is not limited by the diameter or other dimensions, and can ensure structural strength and reliability. The suspension only retains the suspension sealing function, the structure is relatively simple, the design is more compact, and the diameter exceeds that of conventional suspensions, meeting the requirements of various large-diameter operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0019] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the half-section structure of the present invention;

[0021] Figure 4 yes Figure 3 Cross-sectional view of AA in the middle;

[0022] Figure 5 This is a schematic diagram of the reverse-clamping claw spring in this invention;

[0023] Figure 6 This is a schematic diagram of the force-transmitting sleeve in this invention.

[0024] in:

[0025] 1. Upper connector 2. Service tool hydraulic cylinder

[0026] 3. Shear pins 4. Control piston

[0027] 5 Service tool center tube 6 Lock block

[0028] 7. Upload force sleeve 8. Sealing cylinder pressure cap

[0029] 9. Sealing cylinder; 10. Reverse locking claw spring

[0030] 11 Suspension center tube 12 Locking ring

[0031] 13 Upper cone 14 Cylindrical slip

[0032] 15 Discarding limit sleeve 16 Lower cone

[0033] 17. Pressure cap on rubber sleeve 18. Elastic protective sleeve

[0034] 19 Metal Woven Mesh 20 Sealing Glue Sleeve

[0035] 21 Inner skeleton of the rubber tube 22 Lower pressure cap of the rubber tube

[0036] 23 Lower force transmission sleeve 24 Sealing shear pin

[0037] 25 Sealing key 26 Sealing sleeve

[0038] 27 Ball seat connecting sleeve 28 Rubber sleeve locking ring pressure cap

[0039] 29 Rubber sleeve locking ring 30 Ball seat

[0040] 31 Lower connector, 32 Locking block hole.

[0041] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] like Figures 1-6 As shown, a large-diameter suspension device with a diameter-to-thickness ratio exceeding 8 and its supporting service tools are disclosed, including the suspension device and service tools.

[0044] The service tool includes an upper connector 1, a service tool hydraulic cylinder 2, a shear pin 3, a control piston 4, a service tool central tube 5, a locking block 6, a force transmission sleeve 7, a reverse claw spring 10, a release limit sleeve 15, a lower force transmission sleeve 23, a setting shear pin 24, a setting slide key 25, a ball seat connecting sleeve 27, and a ball seat 30. The upper connector 1, the service tool hydraulic cylinder 2, the shear pin 3, the control piston 4, the service tool central tube 5, the locking block 6, and the force transmission sleeve 7 constitute the anchoring drive part of the service tool.

[0045] One end of the service tool center tube 5 is connected to the upper connector 1, and the other end is connected to the ball seat connecting sleeve 27. The service tool center tube 5 is sequentially fitted with a control piston 4, a force transmission sleeve 7, a reverse claw spring 10, a release limit sleeve 15, and a force transmission sleeve 23. The ball seat connecting sleeve 27 is connected to the ball seat 30. The service tool hydraulic cylinder 2 is fitted on the outside of the upper connector 1 and the control piston 4.

[0046] In this embodiment, one end of the upper connector 1 forms a convex ring, and the end of the control piston 4 near the convex ring forms an annular groove. The convex ring is inserted into the groove and fixedly connected by the shear pin 3. The upper connector 1 is threadedly connected to the service tool center tube 5, and the service tool cylinder 2 is threadedly connected to the upper connector 1.

[0047] In this embodiment, the ball seat connecting sleeve 27 is threadedly connected to the service tool center tube 5; the ball seat connecting sleeve 27 is threadedly connected to the ball seat 30;

[0048] In this embodiment, as Figure 6 As shown, the upper force sleeve 7 has a locking hole 32 at one end near the upper connector 1, and multiple slots are evenly distributed along the circumference at the other end; the upper connector 1 has a locking groove at the position corresponding to the locking hole, the locking block 6 is placed in the locking hole and its lower end extends into the locking groove, the control piston 4 is sleeved on the outside of the upper force sleeve 7 at one end near the upper force sleeve 7 and presses on the locking block 6, restricting the radial displacement space of the locking block 6, so that the three are connected to form a whole and will not move relative to each other;

[0049] In this embodiment, the reverse claw spring 10 is located at the upper part of the service tool center tube 5, and the two are connected by a threaded connection; the structure of the reverse claw spring 10 is as follows: Figure 5 As shown, multiple slots are evenly distributed along the circumference at one end near the release limit sleeve 15.

[0050] In this embodiment, the large-diameter portion of the release limit sleeve 15 is inserted into the slotted thread of the reverse claw spring 10, and the release limit sleeve 15 is fixed to the service tool center tube 5 by the shear pin 3.

[0051] In this embodiment, a shear pin hole is formed on the lower force transmission sleeve 23, and a shear pin hole is also formed at the lower part of the service tool center tube 5. The shear pin 3 passes through the shear pin hole on the lower force transmission sleeve 23 and the service tool center tube 5 to fix the lower force transmission sleeve 23 and the service tool center tube 5. The T-shaped seat key 25 fits against the lower force transmission sleeve 23, and the lower force transmission sleeve 23 and the seat key 25 are fixed by the seat shear pin 24. The hanger center tube 11 has an axial groove milled at the position where it mates with the lower force transmission sleeve 23. The small end of the seat key 25 with the T-shaped cross section passes through the groove and connects to the lower force transmission sleeve 23.

[0052] In this embodiment, the service tool further includes a sealing assembly, which includes a sealing ring disposed between the upper connector 1 and the service tool cylinder 2, a sealing ring disposed between the control piston 4 and the service tool cylinder 2, and a sealing ring disposed between the control piston 4 and the service tool center tube 5.

[0053] The hanger includes a sealing cylinder cap 8, a sealing cylinder 9, a hanger center tube 11, a slip locking ring 12, an upper cone 13, a cylindrical slip 14, a lower cone 16, a rubber tube upper cap 17, an elastic protective sleeve 18, a metal braided mesh 19, a sealing rubber tube 20, a rubber tube inner skeleton 21, a rubber tube lower cap 22, a sealing sleeve 26, a rubber tube locking ring cap 28, a rubber tube locking ring 29, and a lower connector 31; the sealing cylinder cap 8, sealing cylinder 9, hanger center tube 11, slip locking ring 12, upper cone 13, cylindrical slip 14, and lower cone 16 constitute the anchoring mechanism of the hanger; the rubber tube upper cap 17, elastic protective sleeve 18, metal braided mesh 19, sealing rubber tube 20, rubber tube inner skeleton 21, rubber tube lower cap 22, sealing sleeve 26, rubber tube locking ring cap 28, and rubber tube locking ring 29 constitute the sealing mechanism of the hanger;

[0054] The central tube 11 of the hanger is sleeved on the outside of the service tool. The central tube 11 of the hanger is sequentially sleeved with a sealing cylinder 9, an upper cone 13, a cylindrical slip 14, a lower cone 16, an upper pressure cap 17 for the rubber tube, a rubber tube mechanism, a lower pressure cap 22 for the rubber tube, a sealing sleeve 26, a rubber tube locking ring pressure cap 28, and a lower connector 31. The end of the sealing cylinder 9 near the upper connector 1 is connected to the sealing cylinder pressure cap 8.

[0055] In this embodiment, the end of the suspension center tube 11 near the upper connector 1 is threadedly connected to the reverse thread of the reverse claw spring 10.

[0056] In this embodiment, one end of the sealing cylinder cap 8 is fitted outside the lower end of the force transmission sleeve 7, and the other end is fitted outside the sealing cylinder 9 and threadedly connected to the sealing cylinder 9; since the lower end of the force transmission sleeve 7 has a slotted structure, it can elastically shrink without restriction, allowing the sealing cylinder cap 8 to be fitted in.

[0057] In this embodiment, one end of the upper cone 13 is inserted into the cylindrical slip 14, and the other end is inserted into the sealing cylinder 9. The upper cone 13 and the sealing cylinder 9 are threaded together, and a slip locking ring 12 is provided between the end of the upper cone 13 and the sealing cylinder 9. A locking ring groove is formed at the corresponding position of the sealing cylinder 9 to facilitate the installation and positioning of the slip locking ring 12.

[0058] In this embodiment, the lower cone 16 is threadedly connected to the first outward protrusion in the middle of the central tube 11 of the hanger to establish a limit and fixation, and one end of it is inserted into the cylindrical slip 14.

[0059] In this embodiment, the pressure cap 17 on the rubber sleeve is threadedly connected to the boss at the middle position of the central tube 11 of the hanger.

[0060] In this embodiment, the rubber tube mechanism includes a sealed rubber tube 20 and a rubber tube inner skeleton 21 embedded inside the sealed rubber tube 20. The sealed rubber tube 20 is provided with a metal braided mesh 19 and an elastic protective sleeve 18 from the inside to the outside at both ends. One end of the rubber tube mechanism is inserted into the groove of the upper pressure cap 17 of the rubber tube, and the other end is inserted into the lower pressure cap 22 of the rubber tube.

[0061] In this embodiment, one end of the sealing sleeve 26 is fitted over the outside of the rubber tube lower pressure cap 22, and the other end is inserted into the rubber tube locking ring pressure cap 28. The sealing sleeve 26, the rubber tube lower pressure cap 22, and the rubber tube locking ring pressure cap 28 are all threadedly connected, and the rubber tube locking ring 29 is embedded between the end of the sealing sleeve 26 and the rubber tube locking ring pressure cap 28. The upper inner wall of the sealing sleeve 26 has an enlarged diameter space, which can just accommodate the seat key 25 exposed outside the central tube 11 of the hanger.

[0062] In this embodiment, the lower connector 31 is threadedly connected to the central tube 11 of the hanger;

[0063] In this embodiment, the hanger further includes a sealing assembly, which includes a sealing ring disposed between the sealing cylinder 9 and the hanger center tube 11, a sealing ring disposed between the upper pressure cap 17 of the rubber cylinder and the hanger center tube 11, a sealing ring disposed between the lower pressure cap 22 of the rubber cylinder and the hanger center tube 11, a sealing ring disposed between the hanger center tube 11 and the lower force transmission sleeve 23, a sealing ring disposed between the sealing sleeve 26 and the hanger center tube 11, and a sealing ring disposed between the hanger center tube 11 and the ball seat 30.

[0064] Working principle of the invention:

[0065] The diameter-to-thickness ratio is the ratio of the maximum outer diameter of the hanger to the maximum wall thickness. The larger the ratio, the larger the diameter of the hanger. In order to make this value exceed 8 while ensuring the suspension and sealing performance of the hanger, the functions of setting, hanging, lowering and torque transmission, and release of the hanger body are all integrated into the matching service tool. The hanger body only retains the anchoring and sealing unit and does not contain the drive structure. This makes the hanger body compact. In addition, the hanger anchoring adopts an integral slip, and the rubber sleeve adopts a thin-walled rubber sleeve structure with protection, which further reduces the thickness to obtain a larger diameter and allows the tool to meet the requirements of large-diameter well completion operations.

[0066] This invention can be applied to expansion screen completion, expansion tube completion, and other suspended tailpipe completion operations. Applicable well types include vertical wells, deviated wells, horizontal wells, and extended reach wells.

[0067] Assembly process of the present invention:

[0068] The connection method of the suspension device and service tool is as follows: Prepare the service tool center tube 5, insert the reverse claw spring 10 into the upper part of the service tool center tube 5 and connect it with threads, insert the release limit sleeve 15 into the service tool center tube 5, and insert the large diameter part of the upper end of the release limit sleeve into the slotted thread of the reverse claw spring 10. Use the shear pin 3 to fix the release limit sleeve 15 to the service tool center tube 5. Insert the lower force transmission sleeve 23 into the service tool center tube 5 from the bottom. The lower force transmission sleeve 23 has shear pin holes for installing shear pins 3. When the shear pin holes reach the shear pin groove position at the bottom of the service tool center tube 5, insert the shear pin 3 and fix the lower force transmission sleeve 23 to the service tool center tube 5. The lower end of the service tool center tube 5 is threaded to the ball seat connecting sleeve 27, and the ball seat connecting sleeve 27 is threaded to the ball seat 30. The service tool installed to this step is called the initial connection state service tool.

[0069] Insert the initial connection service tool into the hanger center tube 11 from top to bottom. Connect the hanger center tube 11 via the reverse thread of the reverse-threaded claw spring 10. Slide the rubber sleeve upper pressure cap 17 onto the hanger center tube 11, threading it into the boss in the middle of the tube. Embed the rubber sleeve inner skeleton 21 inside the sealing rubber sleeve 20. Wrap the ends with metal braided mesh 19 and then insert the elastic protective sleeve 18. Slide the assembled rubber sleeve system onto the hanger center tube 11 and insert it into the groove of the rubber sleeve upper pressure cap 17. The rubber sleeve lower pressure cap 22... Insert the central tube 11 of the hanger into the end of the sealing rubber sleeve 20, then install the setting key 25. The setting key 25 passes through the corresponding groove of the central tube 11 of the hanger and fits the lower force transmission sleeve 23. Fix the lower force transmission sleeve 23 and the setting key 25 with the setting shear pin 24. Then, insert the sealing sleeve 26 from the lower end of the central tube 11 of the hanger, and embed the rubber sleeve locking ring 29 into the rubber sleeve locking ring pressure cap 28. The rubber sleeve locking ring pressure cap 28 and the sealing sleeve 26 are connected by threads. Install the lower connector 31 at the lower end of the central tube 11 of the hanger by threads.

[0070] The lower cone 16 is inserted from the top and installed at the corresponding boss position in the middle of the central tube 11 of the hanger, connected by threads. Then, the cylindrical slip 14 and the upper cone 13 are sequentially inserted. The slip locking ring 12 is embedded into the locking ring groove at the bottom of the sealing cylinder 9. The sealing cylinder 9 and the upper cone 13 are threaded together. The sealing cylinder pressure cap 8 is pre-positioned into the lower end of the force transmission sleeve 7, as shown in the attached diagram. Figure 6The diagram shows a slotted structure that can elastically contract without restriction, allowing the sealing cylinder cap 8 to be inserted. Afterwards, the sealing cylinder cap 8 and the sealing cylinder 9 are connected by threads. A locking block 6 is installed in the locking block groove at the upper end of the force transmission sleeve 7. The locking block is embedded in the corresponding locking block groove on the upper part of the service tool center tube 5, establishing a preliminary connection between the force transmission sleeve 7 and the service tool center tube 5. Then, the control piston 4 is fitted onto the service tool center tube 5 from the top, with the mating surface at the lower end covering the locking block 6, restricting its movement and completing the full connection between the force transmission sleeve 7 and the service tool center tube 5. Next, the upper connector 1 is screwed onto the service tool center tube 5. After the upper connector is installed, it will be inserted into the inner groove at the upper end of the control piston 4. A shear pin 3 is installed at this position to fix the control piston 4 and the upper connector 1. Finally, the service tool hydraulic cylinder 2 is fitted onto the upper connector 1 and the control piston 4, establishing a threaded connection with the upper connector 1.

[0071] The working process of this invention:

[0072] The service tool drives anchoring and sealing: A sealed cavity is established between the control piston 4, upper connector 1, and service tool center tube 5 through the sealing assembly of the service tool. In the non-working state, the relevant parts of the anchoring drive restrict each other's degrees of freedom and will not move, which can avoid erroneous start of the mechanism due to external mechanical forces. In the working state, hydraulic pressure is transmitted to the sealed cavity through the pressure transmission hole on the left side of the service tool center tube 5. The control piston 4 is pushed downward by hydraulic force. When the hydraulic pressure is large enough, the shear pin 3 connecting the control piston 4 and the upper connector 1 is sheared, and the control piston 4 moves downward to the force transmission sleeve 7. At the limit position, because the control piston 4 has an internal expansion diameter, after a certain stroke, the fit between the control piston 4 and the force transmission sleeve 7 at the locking block 6 position changes from a surface fit to a large clearance fit. The inner side of the locking block 6 has a chamfer of not less than 45°, which can radially expand outward into the inner expansion diameter of the control piston 4 after being subjected to force, thus disconnecting the service tool center tube 5 from the force transmission sleeve 7. When the force transmission sleeve receives the thrust provided by the control piston 4, it can continue to transmit the thrust to start the suspension anchoring system. The entire anchoring drive part can only be started by hydraulic pressure, and the force is transmitted by hydraulic pressure, so it will not cause structural failure due to mechanical external force.

[0073] The service tool's driving mechanism for the expansion sealing action: After the service tool is inserted into the hanger body, it connects with the upper end of the hanger center tube 11 via the reverse thread of the reverse claw spring 10. At this time, the lower force transmission sleeve 23 and the ball seat 30 are fully inserted into the hanger center tube 11. Both the lower force transmission sleeve 23 and the ball seat 30 are designed with sealing rings on their outer sides, establishing an insertion seal after insertion into the hanger. When expansion sealing is required, the service tool center tube 5 has a corresponding opening between the lower force transmission sleeve 23 and the ball seat 30. The hydraulic pressure of the center tube can be transmitted from the opening to the ball seat 30 and the lower force transmission sleeve 23. The ball seat 30 is screwed to the service tool center tube 5 via the ball seat connecting sleeve 27 and will not displace due to force. After the lower force transmission sleeve 23 is subjected to force and shears off the shear pin 3 that fixes the part, it will drive the setting slide key 25 to move upward together. The setting slide key 25T The large end of the cross-section is located outside the central tube 11 of the hanger, responsible for transmitting the upward movement from the inside of the central tube outward. The part that contacts the setting key 25 on the outside of the central tube 11 of the hanger is the rubber sleeve lower pressure cap 22. The rubber sleeve lower pressure cap 22 can transmit the upward driving force to the compression expansion sealing system, causing the sealing system to expand. As the hydraulic pressure increases, the lower force transmission sleeve 23 applies sufficient driving force to the setting key 25 to meet the requirement of complete expansion of the sealing system. When the pressure reaches the maximum value allowed for expansion, the setting shear pin 24 connecting the lower force transmission sleeve 23 and the setting key 25 is sheared, and the lower force transmission sleeve 23 separates from the setting key 25, cutting off the force transmission path and avoiding excessive expansion. After the setting key 25 separates, thanks to the T-shaped cross-section structure, the large end is limited by the central tube 11 of the hanger and will not fall through the groove.

[0074] Driven by the service tool, the anchoring and sealing of the main body of the hanger: When the cylindrical slip 14 expands outward, it needs to be pushed downward by the upper cone 13. After the upper cone 13, the sealing cylinder cap 8, and the sealing cylinder 9 are driven by the service tool, they press down on the cylindrical slip 14. Since both the upper cone 13 and the lower cone 14 have conical surfaces, the axial force can be decomposed into radial force, allowing the slip to expand radially and bite the inner wall of the sleeve to achieve anchoring. During the movement, the inner side of the slip locking ring 12 embedded in the sealing cylinder 9 has a downward-facing toothed buckle. This toothed buckle cooperates with the upward-facing toothed buckle on the upper part of the hanger center tube 11 to achieve the anti-reverse locking function, ensuring that the entire anchoring mechanism will not reset or fail after starting. The inner design of the rubber tube pressure cap 22 and the sealing sleeve 26 includes a sealing ring, which can create a sealed space to close the strip groove on the central tube 11 of the hanger used to install the setting key 25, thus isolating the internal and external pressure of the tool. During the expansion sealing operation, the rubber tube pressure cap 22, which receives the force of the setting key 25, drives the sealing sleeve 26, the rubber tube locking ring 29, and the rubber tube locking ring pressure cap 28 to move upward together. The rubber tube locking ring 29 has a toothed buckle with an upward bevel, and the central tube 11 of the hanger has a toothed buckle with a downward bevel, which can prevent the rubber tube locking ring 29 from retracting, thus realizing the step-locking function of the expansion sealing system. When the diameter-to-thickness ratio exceeds 8, the rubber sleeve will be very thin, only half the thickness of a normal hanger. To ensure a good seal, elastic protective sleeves 18 are inserted at both ends of the rubber sleeve to prevent it from being squeezed out under pressure after the sleeve expands. The elastic protective sleeves 18 are easily deformable, have a slotted structure, and are made of a material with a high strength-to-yield ratio, such as annealed QBe2 or H68(Y) copper alloy or other materials with similar mechanical properties. When the sealing rubber sleeve 20 is compressed, the elastic protective sleeves 18 are also squeezed outwards, adhering to the sleeve and forming a metal support to prevent the sleeve from being squeezed out through the gaps under pressure. Two turns of metal are wrapped between the elastic protective sleeves 18 and the sealing rubber sleeve 20. The braided mesh 19 prevents the edge of the grooved part of the elastic protective sleeve 18 from cutting the sealing tube 20. The longitudinal cross-sectional shape of the sealing tube is "convex". The expanded part in the middle is used for compression and expansion to fit the inner wall of the sleeve to achieve a seal. The reduced part at both ends is used to fit the elastic protective sleeve 18 and to embed into the internal recesses of the upper pressure cap 17 and the lower pressure cap 22 of the tube, which plays a fixing role. The thin tube will become hollow after compression. The inner skeleton 21 of the tube is pre-embedded in the middle of the sealing tube 20 where the compression and hollow will occur. The inner skeleton 21 of the tube has an O-ring, which plays an auxiliary sealing function and can increase the pressure resistance limit of the thin-walled tube.

[0075] The service tool drives the release action as follows: After the lower force transmission sleeve 23 separates from the seat key 25, the seat key 25 remains on the central tube 11 of the hanger. The lower force transmission sleeve 23, driven by hydraulic pressure, continues to move upwards. During this movement, it impacts the release limit sleeve 15, causing the shear pin 3 securing the release limit sleeve 15 to break. Under the action of the lower force transmission sleeve 23, the release limit sleeve 15 moves upwards to the reduced-diameter step position inside the anti-locking claw spring 10 and is then stopped. The anti-locking claw spring 10 has a slotted thread with fine-pitch threads and a triangular tooth profile. When subjected to axial force, a radial component force is generated, causing the thread to retract. Before release, the release limit sleeve 15 is inserted inside the slotted area. The hand-limiting sleeve 15 has a structure that is larger at the top and smaller at the bottom. After the large end is inserted, it fits tightly with the threaded claw of the reverse claw spring 10, limiting the radial contraction space. At this time, the threaded connection is in a stable state. When the hand-release limiting sleeve 15 moves upward, the small end of the hand-release limiting sleeve 15 enters the slotted position of the reverse claw spring 10. At this time, a gap will be formed between the reverse claw spring 10 and the hand-release limiting sleeve 15. After being subjected to the axial hydraulic impact from the lower force transmission sleeve 23, it radially contracts and disengages, realizing separation from the suspension center tube 11 and realizing hydraulic hand release. If hydraulic hand release is unsuccessful, the connection between the reverse claw spring 10 and the suspension center tube 11 is itself a reverse threaded connection. Mechanical disengagement can be achieved by rotating the drill string in the forward direction, so that the two are separated.

[0076] In this invention, all hydraulic transmission components are on the service tool. The main body of the hanger only has an anchoring and sealing function module installed on the central tube 11 of the hanger. Without components such as hydraulic cylinders and pistons, the radial structure of the main body of the hanger is simplified and the wall thickness is reduced. This allows for a larger diameter while meeting the usage requirements, enabling the tool to meet the requirements of expansion screen well completion and other various well completion operations.

[0077] The novel positioning hanger provided by this invention integrates hydraulic force transmission, anchoring, setting, and hydraulic-mechanical dual release functions into the delivery tool. Its compact main structure meets the construction requirements of expansion screen pipes and other large-diameter well completion operations. It is easy to operate, enabling setting, sealing, verification, and release operations in a single drilling run. The integrated suspension and sealing functions, along with a specially designed thin-walled rubber sleeve structure, allow for effective pressure bearing without encroaching on the hanger's internal space. The hydraulic reverse-locking dual release function allows the hanger to be used in well conditions with inclination angles ranging from 0° to 90°. A locking block-controlled anti-premature setting system prevents premature setting due to external mechanical forces, enhancing safety.

[0078] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0080] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0081] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A large-diameter suspension device with a diameter-to-thickness ratio exceeding 8 and its matching service tools, characterized in that: The device includes a suspension unit and a service tool. The service tool includes a service tool center tube (5). One end of the service tool center tube (5) is connected to an upper connector (1), and the other end is connected to a ball seat connecting sleeve (27). A control piston (4), a force transmission sleeve (7), a reverse claw spring (10), a release limit sleeve (15), and a lower force transmission sleeve (23) are sequentially fitted on the outside of the service tool center tube (5). The ball seat connecting sleeve (27) is connected to a ball seat (30). The service tool hydraulic cylinder (2) is fitted on the outside of the upper connector (1) and the control piston (4). The hanger includes a hanger center tube (11), which is sleeved on the outside of the service tool. The hanger center tube (11) is fitted with a sealing cylinder (9), an upper cone (13), a cylindrical slip (14), a lower cone (16), an upper pressure cap (17) for the rubber tube, a rubber tube mechanism, a lower pressure cap (22) for the rubber tube, a sealing sleeve (26), a rubber tube locking ring pressure cap (28), and a lower connector (31) in sequence. The end of the sealing cylinder (9) near the upper connector (1) is connected to the sealing cylinder pressure cap (8). The upper force sleeve (7) forms a locking hole (32) at one end near the upper connector (1), and multiple slots are evenly distributed along the circumference at the other end; the upper connector (1) forms a locking groove corresponding to the locking hole, the locking block (6) is placed in the locking hole, and the lower end extends into the locking groove, the control piston (4) is sleeved on the outside of the upper force sleeve (7) at one end near the upper force sleeve (7), and presses on the locking block (6); the lower force sleeve (23) is fixed to the service tool center tube (5) by a shear pin (3); the T-shaped seat key (25) fits against the lower force sleeve (23), and the lower force sleeve (23) is fixed to the seat key (25) by a seat shear pin (24); One end of the upper cone (13) is inserted into the cylindrical slip (14), and the other end is inserted into the sealing cylinder (9). The upper cone (13) and the sealing cylinder (9) are threaded together, and a slip locking ring (12) is provided between the end of the upper cone (13) and the sealing cylinder (9). The rubber tube mechanism includes a sealed rubber tube (20) and a rubber tube inner skeleton (21) embedded inside the sealed rubber tube (20). The two ends of the sealed rubber tube (20) are provided with a metal braided mesh (19) and an elastic protective sleeve (18) from the inside to the outside. One end of the rubber tube mechanism is inserted into the groove of the upper pressure cap (17) of the rubber tube, and the other end is inserted into the lower pressure cap (22) of the rubber tube. A rubber sleeve locking ring (29) is embedded between the end of the sealing sleeve (26) and the rubber sleeve locking ring cap (28).

2. The large-diameter suspension device and its supporting service tools with a diameter-to-thickness ratio exceeding 8 as described in claim 1, characterized in that: One end of the upper connector (1) forms a convex ring, and the end of the control piston (4) near the convex ring forms an annular groove. The convex ring is inserted into the groove and fixedly connected by a shear pin (3). The upper connector (1) is threadedly connected to the service tool center tube (5), and the service tool cylinder (2) is threadedly connected to the upper connector (1). The ball seat connecting sleeve (27) is threadedly connected to the service tool center tube (5), and the ball seat connecting sleeve (27) is threadedly connected to the ball seat (30).

3. The large-diameter suspension device and its supporting service tools with a diameter-to-thickness ratio exceeding 8 as described in claim 1, characterized in that: The reverse claw spring (10) is located in the upper part of the service tool center tube (5), and the two are connected by a threaded connection; the large diameter part of the release limit sleeve (15) is inserted into the slotted thread of the reverse claw spring (10), and the release limit sleeve (15) and the service tool center tube (5) are fixed by a shear pin (3).

4. The large-diameter suspension device and its matching service tools with a diameter-to-thickness ratio exceeding 8 according to claim 1, characterized in that: The lower force transmission sleeve (23) has a shear pin hole, and the lower part of the service tool center tube (5) also has a shear pin hole. The shear pin (3) passes through the shear pin hole on the lower force transmission sleeve (23) and the service tool center tube (5) to fix the lower force transmission sleeve (23) and the service tool center tube (5). The T-shaped seat key (25) fits the lower force transmission sleeve (23) and is fixed to the seat key (25) by the seat shear pin (24). The hanger center tube (11) has an axial groove milled at the position that mates with the lower force transmission sleeve (23). The small end of the T-shaped section of the seat key (25) passes through the groove and connects to the lower force transmission sleeve (23).

5. The large-diameter suspension device and its matching service tools with a diameter-to-thickness ratio exceeding 8 according to claim 1, characterized in that: The end of the central tube (11) of the hanger near the upper connector (1) is threaded to the reverse thread of the reverse claw spring (10); the lower connector (31) is threaded to the central tube (11) of the hanger; one end of the sealing cylinder cap (8) is sleeved outside the lower end of the force transmission sleeve (7), and the other end is sleeved outside the sealing cylinder (9) and threaded to the sealing cylinder (9).

6. The large-diameter suspension device and its supporting service tools with a diameter-to-thickness ratio exceeding 8 according to claim 1, characterized in that: The lower cone (16) and the pressure cap (17) on the rubber sleeve are both threadedly connected to the central tube (11) of the hanger.

7. The large-diameter hanger and matching service tools with a diameter-to-thickness ratio exceeding 8 according to claim 1, characterized in that: One end of the sealing sleeve (26) is fitted outside the rubber tube lower pressure cap (22), and the other end is inserted into the rubber tube locking ring pressure cap (28). The sealing sleeve (26), the rubber tube lower pressure cap (22), and the rubber tube locking ring pressure cap (28) are all connected by threads. The upper inner wall of the sealing sleeve (26) forms an enlarged diameter space to accommodate the seat sealing slide key (25).

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