All-metal pull type drilling liner hanger

Abstract

The invention relates to an all-metal pull type drilling liner hanger which is characterized in that a tie-back barrel is arranged on the upper portion of a seat hanging center pipe, a sliding sleeve capable of sliding in the axial direction is arranged between the seat hanging center pipe and the tie-back barrel in a sleeved mode, the sliding sleeve and a slip are installed in a matched mode, the slip can be opened through pushing of the sliding sleeve, a lower lifting short section is arranged in the tie-back barrel, and a lower lifting short section is arranged in the lower lifting short section. The lower lifting short section extends to the tie-back barrel and extends out of the end part, the end part is connected with the hydraulic cylinder mechanism, and the top end of the end part is connected with the upper lifting short section through a connecting double-nut; the hydraulic cylinder is connected with the sliding sleeve through a force transmission belt, and the sliding sleeve is driven to axially slide through the action of the hydraulic cylinder; in the working process, when the hydraulic cylinder is driven to act, the force transmission belt connected with the hydraulic cylinder drives the sliding sleeve located at the position of the seat hanging center pipe to be pulled, so that the sliding sleeve slides upwards in the axial direction of the tie-back barrel, the sliding sleeve pushes the slip to be opened, and seat hanging of the slip is completed. The hanger has the beneficial effects that the hanging force of the hanger is effectively improved, and gas is prevented from entering the hanger.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole tools, in particular to an all-metal pull-type liner hanger. Background Art

[0002] With the continuous development of the current oil industry, drilling technology has been rapidly developed. As is known to all, during the cementing process, a liner hanger is used to connect the casing and the liner. That is, the liner hanger is first installed at the top of the liner string. When the liner is lowered to the predetermined position at the end of the upper casing, it is firmly clamped, hung, and sealed on the inner wall of the upper casing to complete the seating of the liner hanger. The slips, which are the core components of the hanger, work with the vertebral body. The movement of the vertebral body causes the slips to be stretched and locked to the inner wall of the casing, so that the liner is hung in the casing via the hanger.

[0003] The tail pipe hanger suspends the lower tail pipe on the upper casing, thereby reducing the back-up of cement and the difficulty of cementing construction. However, the current use of multiple tail pipe hangers has the following two problems that need to be solved urgently. First, the effective cylinder diameter of the hydraulic cylinder in the existing tail pipe hanger is relatively small, so the seating force provided to the hanger is limited. As a result, when the hanger is not centered in the casing, the seating force applied is insufficient, resulting in uneven force on the slips, which ultimately affects the normal seating of the hanger; second, the hydraulic cylinder assembly of the existing tail pipe hanger is usually sealed by packing. Packing is an industrial sealing material, but it is like an aging rubber ring under high temperature and high pressure and can be penetrated by gas molecules. Due to the active oil and gas display in the Sichuan, Chongqing and Xinjiang Tarim regions, gas can easily enter the hanger through the sealing packing and the pressure transmission hole, causing gas blowby and increasing the risk of cementing construction.

[0004] Therefore, based on the deficiencies of the existing devices reported by customers, the inventors have made further improvements based on the proposed defects and deficiencies to overcome the above problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a full-metal pull-type tail pipe hanger that is easy to operate, has a simple overall structure, can effectively improve the seating force of the hanger, and can prevent gas from entering the hanger.

[0006] The object of the present invention is achieved through the following technical solutions: an all-metal pull-type liner hanger, comprising a seat hanging center tube, slips, a hydraulic cylinder and a power transmission belt; A return tube is provided on the upper part of the seat hanging center tube, and a sliding sleeve that can slide in the axial direction is provided between the seat hanging center tube and the return tube, and the sliding sleeve is installed in conjunction with a slip, and the slip can be opened by being pushed by the sliding sleeve. A lower lifting short section is provided in the return tube, and the lower lifting short section extends to the return tube and extends out of the end, and the end is connected to the hydraulic cylinder mechanism, and the top end of the end is connected to the upper lifting short section through a connecting double nut; the hydraulic cylinder and the sliding sleeve are connected through a power transmission belt, and the sliding sleeve is driven to slide axially by the action of the hydraulic cylinder; During operation, when the driving cylinder moves, the power transmission belt connected to the cylinder drives the sliding sleeve located at the center tube of the seat to be pulled, so that the sliding sleeve slides upward along the axial direction of the return tube, and the sliding sleeve pushes the slips to open so that the slips complete the seat.

[0007] As the preferred technical solution of the present application, an upper cone is also connected between the seat center tube and the return tube. The upper cone includes a base and an outer cone. The base is fixedly connected to the upper end of the seat center tube, and the angle of the outer cone matches the base and starts to form an inclined surface pair obliquely upward. When the power transmission belt drives the slide tube to slide axially, the cava climbs and opens along the inclined surface of the upper cone, and its radial expansion tightly bites the casing.

[0008] As the preferred technical solution of this application, a pressure transmission hole is provided on the lower lifting short section, and the pressure enters the lower chamber of the hydraulic cylinder through the pressure transmission hole, thereby pushing the hydraulic cylinder to move upward and driving the connected power transmission belt to move upward, thereby generating a pulling force on the sleeve, pulling the sleeve to slide upward along the axis of the upper cone and push the cava.

[0009] As a preferred technical solution of this application, the hydraulic cylinder is installed on the upper part of the lower lifting short section, and the hydraulic cylinder has built-in shear pins and pistons; When pressure is not applied to the hydraulic cylinder through the pressure transmission hole, the hydraulic cylinder and the lower lifting short section are locked. When the transmission pressure enters the lower chamber of the hydraulic cylinder, the pressure in the lower chamber increases, pushing the hydraulic cylinder piston upward. When the pressure reaches the limit value, the shear pins are sheared, and the hydraulic cylinder and the lower lifting short section are unlocked.

[0010] As a preferred technical solution of the present application, the power transmission belt is fixed to the return cylinder by a plurality of limit buckles, thereby preventing the flow of the annular hole fluid from causing impact and swinging on the power transmission belt.

[0011] As the preferred technical solution of this application, the power transmission belt is connected to the hydraulic cylinder via a T-shaped protective shell. The protective shell is divided into two symmetrical half shells and has grooves and through holes inside the protective shell. The two ends of the power transmission belt are located inside the grooves of the protective shell and are connected to the hydraulic cylinder by bolts.

[0012] As the preferred technical solution of this application, it also includes a sand-proof cap; the sand-proof cap is installed on the upper part of the return tube and located on the lower side of the liquid cylinder, and a cutting blade is opened on the outside of the sand-proof cap along its circumferential direction for cutting the power transmission belt.

[0013] As the preferred technical solution of the present application, a protrusion is provided at the position where the hydraulic cylinder cooperates with the lower lifting short section, and a matching slot is provided on the inner side of the hydraulic cylinder; when the power transmission belt is lifted without breaking or cannot be forcibly lifted, the protrusion cooperates with the slot, and the upper lifting short section is rotated at this time to rotate the hydraulic cylinder and the power transmission belt, so that the power transmission belt contacts the blade on the sand control cap and is cut off.

[0014] The present invention has the following advantages: (1) Effectively improve the hanging force of the hanger and prevent gas from entering the hanger; The effective cylinder diameter of the hydraulic cylinder in the existing hanger is small, and the seating force provided is limited, resulting in the applied seating force not being able to balance the force on the slips, affecting the normal seating of the hanger; and under high temperature and high pressure, gas can easily enter the interior of the hanger through the sealing packing and the pressure transmission hole, causing gas blowby problems; therefore, in this solution, the hydraulic cylinder is designed between the upper lifting short section and the lower lifting short section. Compared with the existing structure in which the slips push the seating through the hydraulic cylinder of the hanger body, the hanger body of the present invention left in the well has no pressure transmission hole and no rubber element, and can adapt to working conditions with higher temperature and pressure. At the same time, there is no need to worry about gas flowing from the pressure transmission hole to the interior of the hanger. At the same time, the hydraulic cylinder is located in the upper area and can be designed with a larger hydraulic cylinder diameter, which can provide 3-5 times the thrust of the existing hydraulic cylinder and is more adaptable to various different seating working conditions; (2) Easy to operate, simple overall structure, and the seat is hung by remotely pulling the sliding sleeve through the power transmission belt; The power transmission belt used in this solution is made of high-strength fiber or metal, which can effectively ensure the reliability of the power transmission belt. The power transmission belt applies force to the sleeve accurately and has a stable structure. The rotating blade structure enables the device to be released with one click in an emergency. At the same time, a limit buckle structure is provided to connect the power transmission belt to the return cylinder to avoid the power transmission belt from swinging under the drive of the fluid due to a large displacement of fluid flowing in the annulus where the power transmission belt is located during the cementing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the present invention from a first viewing angle; Figure 2 It is a schematic diagram of a partially half-section structure of the present invention; Figure 3 This is a schematic structural diagram of the power transmission belt connector of the present invention; Figure 4 Schematic diagram of the structure of the upper lifting sub and the lower lifting sub of the present invention; Figure 5 It is a structural schematic diagram of a cross-section of the cylinder plate surface of the present invention; Figure 6 It is a structural schematic diagram of the sand-proof cap of the present invention; In the figure: 1-seat hanging center tube, 2-sliding sleeve, 3-slip, 4-upper cone, 5-return cylinder, 6-limiting buckle, 7-sand control cap, 8-inner sleeve, 9-power transmission belt, 10-connector, 11-hydraulic cylinder, 12-lower lifting short section, 13-connecting double nut, 14-upper lifting short section, 15-protective shell, 16-blade, 17-bump, 18-slot, 19-pressure transmission hole. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0017] It should be noted that the directions or positional relationships indicated by “left”, “right”, etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the invented product is usually placed when in use, or are the directions or positional relationships commonly understood by those skilled in the art. Such terms are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0019] It should be noted that the seating action of the liner hanger on the casing in the well means that the fixed components (slips) in the hanger are activated and can be firmly wedged or bitten into the inner wall of the casing; through this wedging action, the weight of the liner connected to the liner hanger is suspended on the casing without being lifted by the drill pipe or the lowering tool.

[0020] In short, the core task of the liner hanger is: when the liner is lowered to the predetermined position at the end of the upper casing (technical casing), the hanger firmly clamps the liner and hangs it on the inner wall of the upper casing through the slips.

[0021] Generally speaking, the common ways to trigger the hanger's seating mechanism are divided into the following types: rotary seating, lifting or lowering seating, and hydraulic seating; rotary seating usually involves rotating the drill pipe a certain number of times at the wellhead, and the rotational action is transmitted through the drill pipe to a special mechanism inside the hanger (such as pins, cams, splines), releasing the slips or pushing the cone upward; while lifting / lowering seating involves lifting and lowering the drill pipe at the wellhead (or directly lowering a certain weight), which triggers the mechanical device inside the hanger and releases the slips; finally, hydraulic seating involves pumping drilling fluid from the ground to increase the pressure. The increased pressure acts on the piston or rubber plug inside the hanger, pushing the cone or directly pushing the slips, thereby completing the seating action.

[0022] See Figures 1 to 6The present embodiment proposes an all-metal pull-type liner hanger, comprising a center tube 1, a hydraulic cylinder 11, a force transmission belt 9, and slips 3; Among them, see Figure 1 The upper part of the seat hanging center tube 1 is connected to a return tube 5, and a sliding sleeve 2 that can slide axially along the return tube 5 is installed on the lower side of the return tube 5 (i.e., between the seat hanging center tube 1 and the return tube 5). At the same time, a slip 3 is installed on the upper side of the sliding sleeve 2. The slip 3 can be pushed open by the upward sliding action of the sliding sleeve 2, thereby releasing the slip 3; Among them, see Figure 1 and Figure 2 The lower lifting subsection 12 is installed inside the return tube 5. The top end of the lower lifting subsection 12 is located above the return tube 5, and a hydraulic cylinder 11 mechanism is installed at the end position of the lower lifting subsection 12. At the same time, the top end of the lower lifting subsection 12 is connected to a connecting double nut 13, and the other end of the connecting double nut 13 is connected to the upper lifting subsection 14. Among them, see Figure 1 The hydraulic cylinder 11 is connected to the sliding sleeve 2 located at the center tube 1 of the seat through a force transmission belt 9, so that remote pushing can be achieved through the hydraulic cylinder 11, so that the sliding push slips 3 are opened for seat hanging.

[0023] During operation, after reaching the predetermined depth, a ball is thrown from the wellhead to hold the pressure. The pressure pushes the hydraulic cylinder 11 so that the hydraulic cylinder 11 moves the sleeve 2 through the force transmission belt 9, thereby pushing out the slips 3 to complete the seating.

[0024] At present, in the existing liner hanger driven by the hydraulic cylinder 11, the hydraulic cylinder 11 is often arranged at the bottom of the device, so its placement space is relatively small, resulting in a relatively small effective cylinder diameter. Therefore, the seating force provided by the hanger is insufficient, resulting in insufficient seating force when the hanger is not centered in the casing, causing uneven force on the slips 3, and finally affecting the normal seating of the hanger; at the same time, since the hydraulic cylinder 11 component of the existing hanger is often sealed by packing, the packing can be permeated by gas molecules under high temperature and high pressure, thereby causing gas blowby, increasing the risk of cementing construction; the metal pull-type liner hanger in this solution arranges the hydraulic cylinder 11 component at the upper part of the device, remotely transmits power through the power transmission belt 9, and then realizes the seating of the slips 3 through the cooperation of the sliding sleeve 2. The hydraulic cylinder 11 is arranged at the upper part, so that the cylinder diameter of the hydraulic cylinder 11 can be designed to be 3-5 times the original size, thereby effectively improving the seating force, and the hydraulic cylinder 11 is arranged at the upper part, avoiding the gas blowby problem caused by the use of packing sealing.

[0025] In this embodiment, refer to Figure 1 and Figure 2, for the seat hanging center tube 1; the bottom of the seat hanging center tube 1 is connected with the tail pipe, and an upper cone 4 is also connected between the seat hanging center tube 1 and the return tube 5. The upper cone 4 is composed of a base and an outer cone surface. The base is fixedly connected to the seat hanging center tube 1, and its outer cone surface can support the slips 3. When the sleeve 2 slides axially upward, the slips 3 expand radially along the inclined surface of the upper cone 4, so that the slips 3 bite the inner wall of the casing to complete the seat hanging.

[0026] It should be noted that the traditional design has a mechanism that uses hydraulic pressure to push the cone to expand the cava 3 to complete the seating, but this method is prone to jamming. The present solution uses hydraulic pressure to pull the sleeve 2 to push out the cava 3, which has low movement resistance and high reliability. At the same time, the present solution uses an upper cone 4 structure instead of the lower cone structure in the transmission hanger device. First, it is adapted to the pulling seating method adopted by the tail pipe hanger. The cava 3 is pushed upward and expanded along the cone surface, avoiding the problem of the cava 3 in the traditional lower cone sliding downward and expanding due to gravity causing it to get stuck (especially in inclined wells).

[0027] Furthermore, for the lower lifting short section 12; a pressure transmission hole 19 is opened in the lower lifting short section 12, and a hydraulic cylinder 11 is set at the position of the pressure transmission hole 19. The pressure enters the lower cavity of the hydraulic cylinder 11 through the pressure transmission hole 19 by throwing the ball and holding the pressure, and can push the hydraulic cylinder 11 to move upward and drive the connected power transmission belt 9 to move upward, thereby generating a pulling force on the sliding sleeve 2, pulling the sliding sleeve 2 to slide upward along the axis of the return tube 5 and push the slip 3; at the same time, a piston and a shear nail are set in the hydraulic cylinder 11, and the shear nail passes through the piston of the hydraulic cylinder 11 and the lower lifting short section 12 horizontally, which is usually 2-4 pieces, evenly distributed along the circumference (to avoid single point failure), when the pressure is accumulated by throwing the ball and enters the hydraulic cylinder 11 through the pressure transmission hole 19, the piston of the hydraulic cylinder 11 is subjected to upward hydraulic pressure and transmits the force to the shear nails. After the shear stress of the shear nails reaches a certain limit, the shear nails break. Since the shear nails are similar to the door bolt structure that locks the hydraulic cylinder 11 and the lower lifting short section 12, when the shear nails break, the physical connection between the piston of the hydraulic cylinder 11 and the lower lifting short section 12 is released, and the hydraulic cylinder 11 loses its constraint, so that it can slide freely upward under the hydraulic thrust.

[0028] It should be noted that the ball-dropping pressure-holding structure is a common ball-dropping pressure-holding structure currently used in liner hangers. It is a prior art and does not fall within the scope of protection of this patent solution. Therefore, it is not reflected in the device structure of this solution. In this embodiment, refer to Figure 1 and Figure 3, for the power transmission belt 9; the power transmission belt 9 selected in this scheme is high-strength fiber or high-strength metal, which can ensure the reliability of the power transmission belt 9. After the cava 3 completes the seat hanging, it needs to be released. At this time, the power transmission belt 9 needs to be disconnected before the upper mechanism (upper lifting short section 14, hydraulic cylinder 11 and lower lifting short section 12, etc.) can be detached and taken out. Therefore, the maximum tension that the power transmission belt 9 can withstand is greater than the maximum tension that the hydraulic cylinder 11 can generate, and at the same time less than twice the maximum tension that the hydraulic cylinder 11 can generate; at the same time, according to the actual needs of different projects, the number of power transmission belts 9 in the scheme can be increased or decreased to a certain extent, but the number of power transmission belts 9 must be an even number and evenly distributed along the circumference of the return tube 5, so as to ensure the uniformity of force transmitted from the hydraulic cylinder 11 to the cava 3.

[0029] Furthermore, the multiple power transmission belts 9 are fixed to the return cylinder 5 via multiple limit buckles 6, thereby preventing the flow of the annular hole fluid from causing impact and swing on the power transmission belt 9.

[0030] Furthermore, the upper and lower ends of the power transmission belt 9 are respectively fixed to the outer wall of the hydraulic cylinder 11 and the sliding sleeve 2 through the connecting head 10. The connecting head 10 has a T-shaped protective shell 15, which is divided into two symmetrical half shells and the protective shell 15 has grooves and through holes. The two ends of the power transmission belt 9 are located inside the grooves of the protective shell 15 and are connected to the hydraulic cylinder 11 and the sliding sleeve 2 by bolts.

[0031] It should be noted that the working process of this scheme is as follows: first, the device is lowered into the well, at this time, the slip 3 is retracted (the sleeve 2 has not moved), the shear pins of the hydraulic cylinder 11 have not been cut off (the hydraulic cylinder 11 is locked with the lower lifting short section 12), and the power transmission belt 9 is in a standby state; at this time, a pressure-holding ball is dropped from the wellhead, and the ball sits on the ball seat of the lower lifting short section 12 to seal the flow channel, and then the drilling fluid is pumped in to increase the pressure, causing the pressure to enter the lower chamber of the hydraulic cylinder 11 through the pressure transmission hole 19. When the pressure in the lower chamber of the hydraulic cylinder 11 increases, the hydraulic cylinder 11 is immediately pushed to move upward; then when the pressure reaches the threshold, the shear pins are sheared (at this time the hydraulic cylinder 11 and the lower lifting short section 12 are unlocked and can move upward freely); the upward movement of the hydraulic cylinder 11 causes the power transmission belt 9 to be pulled through the connecting head 10, and the power transmission belt 9 drives the sliding sleeve 2 to slide upward, and finally the sliding sleeve 2 pushes the slip 3 to expand radially along the inclined surface of the lower cone, and the slip 3 bites the upper casing wall to complete the seating.

[0032] At the same time, after the seating and cementing construction are completed, the upper lifting short section 14 is lifted to drive the hydraulic cylinder 11 to move upward. When the hydraulic cylinder 11 moves upward, the power transmission belt 9 is continuously tightened. When the lifting force is greater than the tolerable limit of the power transmission belt 9, the power transmission belt 9 breaks, and then the connector 10, hydraulic cylinder 11, upper lifting short section 14, lower lifting short section 12, and connecting double nut 13 are pulled out of the well together with the upper drilling tool, and the following components remain in the well: the seating center pipe 1 + sliding sleeve 2 + slips 3 + tie-back tube 5. Pulling out the released components can ensure that complex structures are not left at the bottom of the well, and at the same time avoid the hydraulic cylinder 11 in the transmission hanger to remain in the well (which needs to be sealed through packing). This solution directly pulls out the hydraulic cylinder 11 together with the upper release component, fundamentally avoiding the sealing failure and air leakage problems of the hydraulic cylinder 11.

[0033] In this embodiment, refer to Figure 1 and Figure 6 , and also includes a sand-proof cap 7; the sand-proof cap 7 includes an inner sleeve 8, which is sleeved on the upper part of the return tube 5, and the sand-proof cap 7 is located below the liquid cylinder 11. A cutting blade 16 is provided on the outside of the sand-proof cap 7. The blade 16 is opened along its circumferential direction and can cut off the power transmission belt 9. The blade 16 structure of the sand-proof cap 7 is essentially a hand-off safety structure.

[0034] Furthermore, a protrusion 17 is provided at the position where the hydraulic cylinder 11 cooperates with the lower lifting short section 12, and a matching slot 18 is provided on the inner side of the hydraulic cylinder 11; when the power transmission belt 9 is lifted without breaking or cannot be forcibly lifted, the protrusion 17 cooperates with the slot 18, and the upper lifting short section 14 is rotated at this time to rotate the hydraulic cylinder 11 and the power transmission belt 9, so that the power transmission belt 9 contacts the blade 16 on the sand control cap 7 and is cut off; this blade 16 safety structure and the lifting and breaking of the power transmission belt 9 together constitute a double insurance release, which is accurate and stable to avoid failure of release.

[0035] In the traditional hanger, the hydraulic cylinder 11 is located inside the hanger body and is subject to the geometric constraints of the inner diameter of the hanger body. In this solution, the middle hydraulic cylinder 11 moves upward and converts the driving force of the hydraulic cylinder 11 into a pulling force through the power transmission belt 9 and the sliding sleeve 2. In this solution, the hydraulic cylinder 11 is located between the upper lifting short section 14 and the lower lifting short section 12. When the hydraulic cylinder 11 is in motion, the sliding sleeve 2 that cooperates with the slip 3 is driven by the power transmission belt 9 to achieve the hanging. Therefore, the hydraulic cylinder 11 in this solution can be designed to a larger hydraulic cylinder 11 cylinder diameter, providing 3-5 times the thrust of the existing hydraulic cylinder 11, thereby improving the success rate of the hanger hanging and adapting to different In the seat-hanging working condition, this solution realizes long-distance transmission by pulling instead of pushing, and there is no pressure transmission hole 19 in the structure finally left in the well (the lower lifting short section 12 with the pressure transmission hole 19 is proposed), avoiding the problem of gas blowby caused by poor sealing and adapting to higher temperature and pressure conditions; at the same time, the design of the power transmission belt 9 in this solution is very intelligent, which can withstand daily pulling force (1-2 times the hydraulic cylinder force) and can be disconnected in an emergency. The blade 16 mechanism as a double insurance is also very clever, which effectively avoids failure to lose the hand, and the limit buckle 6 structure prevents the power transmission belt 9 from swinging, which can solve the internal fluid disturbance problem.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An all-metal pull-type liner hanger, characterized by: It includes a seat center tube (1), slips (3), a hydraulic cylinder (11) and a power transmission belt (9); A return tube (5) is provided on the upper part of the seat hanging center tube (1), and a sliding sleeve (2) that can slide in the axial direction is provided between the seat hanging center tube (1) and the return tube (5), and the sliding sleeve (2) is installed in conjunction with a slipper (3), and the slipper (3) can be opened by being pushed by the sliding sleeve (2). A lower lifting short section (12) is provided in the return tube (5), and the lower lifting short section (12) extends to the return tube (5) and extends out of the end, and the end is connected to the hydraulic cylinder (11) mechanism and the top end is connected to the upper lifting short section (14) through a connecting double mother (13); the hydraulic cylinder (11) and the sliding sleeve (2) are connected through a power transmission belt (9), and the sliding sleeve (2) is driven to slide axially by the action of the hydraulic cylinder (11); During operation, when the driving cylinder (11) moves, the transmission belt (9) connected to the cylinder (11) drives the sliding sleeve (2) located at the position of the seat hanging center tube (1) to be pulled, so that the sliding sleeve (2) slides upward along the axial direction of the return tube (5), and the sliding sleeve (2) pushes the slips (3) to open, so that the slips (3) complete the seat hanging.

2. The all-metal pull-type liner hanger according to claim 1, characterized in that: An upper cone (4) is also connected between the seat center tube (1) and the return tube (5). The upper cone (4) includes a base and an outer cone. The base is fixedly connected to the upper end of the seat center tube (1), and the outer cone angle starts to form an inclined surface pair upward. When the transmission belt (9) drives the slide tube to slide axially, the slip (3) climbs and opens along the inclined surface of the upper cone (4), and its radial expansion tightly bites the casing.

3. The all-metal pull-type liner hanger according to claim 1, characterized in that: A pressure transmission hole (19) is provided on the lower lifting short section (12), and the pressure enters the lower chamber of the hydraulic cylinder (11) through the pressure transmission hole (19), thereby pushing the hydraulic cylinder (11) to move upward and driving the connected power transmission belt (9) to move upward, thereby generating a pulling force on the sliding sleeve (2), pulling the sliding sleeve (2) to slide upward along the axis of the upper cone (4) and pushing the slipper (3).

4. The all-metal pull-type liner hanger according to claim 3, characterized in that: The hydraulic cylinder (11) is installed on the upper part of the lower lifting short section (12), and the hydraulic cylinder (11) has built-in shear nails and a piston; When pressure is applied to the cylinder (11) without passing through the pressure transmission hole (19), the cylinder (11) and the lower lifting short section (12) are locked. When the transmission pressure enters the lower chamber of the cylinder (11), the pressure in the lower chamber increases, pushing the piston of the cylinder (11) to move upward. When the pressure reaches a limit value, the shear pins are sheared, and at this time, the cylinder (11) and the lower lifting short section (12) are unlocked.

5. The all-metal pull-type liner hanger according to claim 1, characterized in that: The power transmission belt (9) is fixed to the return cylinder (5) via a plurality of limiting buckles (6), thereby preventing the flow of the annular hole fluid from causing impact and swinging on the power transmission belt (9).

6. The all-metal pull-type liner hanger according to claim 5, characterized in that: The power transmission belt (9) is connected to the liquid cylinder (11) via a T-shaped protective shell (15). The protective shell (15) is divided into two symmetrical halves, and the protective shell (15) has a groove and a through hole. The two ends of the power transmission belt (9) are located inside the grooves of the protective shell (15) and are connected to the liquid cylinder (11) by bolts.

7. The all-metal pull-type liner hanger according to claim 1, characterized in that: It also includes a sand-proof cap (7); the sand-proof cap (7) is installed on the upper part of the return tube (5) and is located on the lower side of the liquid cylinder (11); a cutting blade (16) is provided on the outer side of the sand-proof cap (7) along its circumferential direction for cutting the power transmission belt (9).

8. The all-metal pull-type liner hanger according to claim 7, characterized in that: A protrusion (17) is provided at a position where the hydraulic cylinder (11) cooperates with the lower lifting short section (12), and a slot (18) matching the same is provided on the inner side of the hydraulic cylinder (11); when the power transmission belt (9) is lifted without breaking or cannot be forcibly lifted, the protrusion (17) cooperates with the slot (18), and at this time, the upper lifting short section (14) is rotated to rotate the hydraulic cylinder (11) and the power transmission belt (9), so that the power transmission belt (9) contacts the blade (16) on the sand control cap (7) and is cut off.

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