Large-drift-diameter high-temperature high-pressure high-bearing suspension well completion packer

Abstract

The invention relates to the technical field of oil development underground equipment, and discloses a large-drift-diameter high-temperature high-pressure high-bearing suspension well completion packer. Comprising a packing sealing system assembly, a locking system assembly, a piston hydraulic transmission system assembly, a high-bearing slip anchoring system assembly and a release claw release system assembly which are sequentially arranged on the outer wall of a central pipe in a sleeving mode from top to bottom and detachably connected through threads. The large-drift-diameter high-temperature high-pressure high-bearing suspension well completion packer is large in drift diameter, resistant to high temperature, resistant to high pressure difference and high in bearing capacity, and open hole section suspension supporting and acid fracturing well completion construction can be completed through one pipe column.

Description

Technical Field

[0001] The invention relates to the technical field of downhole equipment for petroleum development, and in particular to a large-diameter, high-temperature, high-pressure and high-load suspension completion packer. Background Art

[0002] In the development of oil and gas reservoirs, in order to prevent the collapse of the open hole wellbore during production, the lower open hole adopts the hanging packer + wellbore support string completion method. Generally, a hanging support string is first placed to form a high-load suspension anchor, and then the upper string is released and pulled out, and then a reservoir transformation acid fracturing completion string is placed to complete the well, which meets the requirements of large-diameter, large-displacement construction, high-temperature resistance, and high-pressure difference resistance to seal the casing annulus, isolate the target layer, and control the injection or production of fluids.

[0003] In addition, the commonly used suspended completion packers on the market have problems such as small internal diameter, low anchor load, low temperature and pressure resistance, easy anchor slippage and failure of the sealing rubber tube to withstand pressure, which may lead to the loss of the packer seal and the failure of the completion modification. In severe cases, serious production safety accidents may occur. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a large-diameter, high-temperature, high-pressure, and high-load suspension completion packer, which has a large diameter, is resistant to high temperatures, can withstand high pressure differences, has a high load capacity, and can complete the open hole section suspension support and acid fracturing completion construction in one trip of the tubing string.

[0005] To achieve the above-mentioned purpose, the large-diameter, high-temperature, high-pressure and high-load suspension completion packer designed in the present invention includes a sealing system component, a locking system component, a piston hydraulic transmission system component, a high-load slip anchor system component and a release claw release system component, which are sequentially sleeved on the outer wall of the central pipe from top to bottom and are detachably connected to each other by threads.

[0006] Preferably, the isolation sealing system component includes an upper guide ring, a rubber cylinder assembly and a lower guide ring which are sequentially sleeved on the outer wall of the center tube from top to bottom, the upper guide ring and the lower guide ring are connected to the rubber cylinder assembly by threaded contact, the upper end of the upper guide ring is abutted against a positioning boss arranged at the upper end of the center tube by thread, and the upper guide ring is fixed to the center tube by a first tightening pin, the lower end of the lower guide ring is abutted against a positioning boss of a cylinder sleeve sleeved on the center tube by thread, and the lower guide ring is fixed to the cylinder sleeve by a second tightening pin.

[0007] Preferably, the rubber cylinder assembly includes a middle rubber cylinder sleeved on the outer wall of the center tube, end rubber cylinders located at both ends of the middle rubber cylinder, and a support back ring located on the outside of the end rubber cylinder and clamping the end rubber cylinders. The outer wall of the center tube is provided with a retaining ring for positioning the middle rubber cylinder at a position located on the middle rubber cylinder, the outer wall of the center tube is provided with a rubber cylinder spacer ring at a position located between the middle rubber cylinder and the end rubber cylinders, the outer wall of the center tube is provided with an anti-drill ring at a position located between the end rubber cylinder and the support back ring, and the upper guide ring and the lower guide ring are connected to the support back ring through threaded interference.

[0008] Preferably, the support back ring adopts a bowl-shaped structure, the anti-drill ring is a triangular cross-section ring structure, the end rubber tube is a bowl-shaped structure, and its hardness is higher than that of the middle rubber tube with a semicircular groove convex structure designed in the middle, the rubber tube spacer ring is a Z-shaped structure, and the retaining ring is a semicircular cross-section ring structure. The end rubber tube and the middle rubber tube are both made of fluororubber material, and the anti-drill ring is made of polyetheretherketone material.

[0009] Preferably, the piston hydraulic transmission system component includes the lower guide ring and a lower piston sleeved on the center tube, the lower piston is located inside the cylinder sleeve, a limit splitting ring sleeved on the center tube is provided between the lower guide ring and the lower piston, the limit splitting ring is installed in the ring groove of the center tube and fixed by a rubber ring, first pressure transmission holes are provided on both sides of the limit splitting ring, a second pressure transmission hole is provided on the tube wall of the center tube, the second pressure transmission hole is connected to the inner hole of the center tube, and the first pressure transmission hole of the limit splitting ring connects the lower guide ring and the piston cavity of the lower piston.

[0010] Preferably, a first O-ring seal and a group of first O-ring retaining rings are arranged between the lower guide ring and the cylinder sleeve, two second O-ring seals and two groups of second O-ring retaining rings are arranged between the lower guide ring and the center tube, two first O-ring seals and two groups of first O-ring retaining rings are arranged between the lower piston and the cylinder sleeve, and two second O-ring retaining rings and two second groups of O-ring retaining rings are arranged between the lower piston and the center tube.

[0011] Preferably, the locking system component includes a locking ring seat sleeved and installed on the lower piston, a locking ring is installed between the lower piston and the locking ring seat, the locking ring adopts a C-shaped double-sided thread structure with inner and outer special-shaped sparse and dense unidirectional teeth, and can only move in one direction according to the set tooth direction, the inner side of the locking ring is threadedly locked with the lower piston, the outer side of the locking ring is threadedly connected to the locking ring seat and fixed with an anti-rotation screw, the locking ring seat is threadedly connected to the cylinder sleeve and is provided with a first set screw, the outer wall of the center tube is located at the lower end of the lower piston and is sleeved with a shear sleeve, the lower piston is threadedly connected to the shear sleeve and is provided with a second set screw, and the locking ring seat and the shear sleeve are fixedly connected by a piston starting pin.

[0012] Preferably, the high-load-bearing cava anchoring system component includes an upper cone, a two-way integral barrel-shaped elastic cava and a lower cone which are sequentially sleeved on the outer wall of the central tube from top to bottom. The two-way integral barrel-shaped cava is integrated into one body by the upper cone and the lower cone. The upper cone is threadedly connected to the shear sleeve, and a lower locking ring sleeved on the outer wall of the central tube is arranged inside the upper end of the upper vertebral body. The lower locking ring and the upper vertebral body are directly provided with anti-rotation screws. The lower cone is threadedly connected to a lower joint connecting sleeve sleeved on the outer wall of the central tube. The surface of the two-way integral barrel-shaped elastic cava is provided with evenly distributed and staggered grooves. The outer sides of the upper cone and the lower cone are each provided with two evenly distributed grooves, and the grooves of the two are in a 90° offset relative relationship. The upper cone and the lower cone are The grooves corresponding to the bidirectional integral barrel-shaped cava are each provided with a cava anti-rotation key block, and are fixed by a third set screw; an upper shear pin fixed by thread connection is provided between the upper end of the bidirectional integral barrel-shaped cava and the upper vertebral body; a lower shear pin fixed by thread connection is provided between the lower end of the bidirectional integral barrel-shaped cava and the lower vertebral body; a third O-ring and a third O-ring retaining ring are provided between the interior of the lower vertebral body and the center tube; a serrated thread is provided on the outer circle of the lower middle part of the center tube; when the packer is recovered, the serrated thread moves to the lower locking ring and engages with the inner teeth of the lower locking ring in reverse; after engagement, the upper vertebral body is driven to move upward to release the bidirectional integral barrel-shaped cava, release the locking force, and drive the bidirectional integral barrel-shaped cava to be recovered and release the anchoring.

[0013] Preferably, the release claw release system assembly includes the lower joint connecting sleeve and a release claw sleeved on the outer wall of the center pipe, the upper end of the release claw is threadedly connected to the center pipe, and the lower end is threadedly connected to the lower joint connecting sleeve, the lower end of the lower joint connecting sleeve is threadedly connected to the lower joint sleeve sleeve, and is fixed by a fourth set screw, a fourth O-ring is padded between the lower joint and the lower joint connecting sleeve, a release claw support body is installed inside the release claw, an unsealing shear pin is installed in the annular groove of the release claw support body through the release claw threaded hole, two fifth O-rings are arranged on the outer circle of the release claw support body and form a seal with the lower joint, when the unsealing delivery tool needs to unseal and recover the packer, it is placed in the oil pipe from the wellhead, on the upper part of the release claw support body, and forms a surface seal with the release claw support body.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. Large diameter, high temperature resistance, high pressure difference resistance, and high load-bearing capacity;

[0016] 2. Bidirectional integral barrel-shaped slip structure with good anchoring performance;

[0017] 3. It can be better used in one trip of tubing to achieve suspension support, acid fracturing and completion construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a large-diameter, high-temperature, high-pressure, and high-load suspension completion packer of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the isolation and sealing system components;

[0020] Figure 3 It is a structural schematic diagram of the piston hydraulic transmission system components;

[0021] Figure 4 is a schematic diagram of the structure of the locking system components;

[0022] Figure 5 It is a structural schematic diagram of the high load-bearing slip anchoring system components;

[0023] Figure 6 Schematic diagram of the structure of the release claw release system components.

[0024] The components in the figure are numbered as follows:

[0025] Center tube 1, upper guide ring 2, rubber cylinder assembly 3, lower guide ring 4, first fixing pin 5, cylinder sleeve 6, second fixing pin 7, lower piston 8, limit split ring 9, rubber ring 10, first O-ring 11, first O-ring retainer 12, second O-ring 13, second O-ring retainer 14, lock ring seat 15, lock ring 16, anti-rotation screw 17, first fixing screw 18, shear sleeve 19, second fixing screw 20, piston start pin 21, upper cone 22, two-way integral barrel elastic slip 23, lower cone 24, lower lock ring 2 5. Anti-rotation screw 26, lower joint connecting sleeve 27, slip anti-rotation key block 28, third set screw 29, middle rubber tube 31, end rubber tube 32, support back ring 33, retaining ring 34, rubber tube spacer ring 35, anti-drill ring 36, upper shear pin 41, lower shear pin 42, third O-ring 43, third O-ring retaining ring 44, fourth O-ring 45, release claw 46, lower joint 47, fourth set screw 48, release claw support body 49, unsealing shear pin 50, fifth O-ring 51, unsealing delivery tool 52. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1As shown, a large-diameter, high-temperature, high-pressure, and high-load suspension completion packer includes a sealing system component, a locking system component, a piston hydraulic transmission system component, a high-load slip anchoring system component, and a release claw release system component, which are sequentially sleeved on the outer wall of a central pipe 1 from top to bottom and are detachably connected to each other by threads.

[0028] Among them, combined Figure 1 and Figure 2 As shown, the isolation sealing system assembly includes an upper guide ring 2, a rubber cylinder assembly 3 and a lower guide ring 4 which are sequentially sleeved on the outer wall of the center tube 1 from top to bottom. The upper guide ring 2 and the lower guide ring 4 are connected to the rubber cylinder assembly 3 through threaded contact. The upper end of the upper guide ring 2 is abutted against a positioning boss arranged on the upper end of the center tube 1 through a thread, and the upper guide ring 2 and the center tube 1 are fixed by a first fixing pin 5. The lower end of the lower guide ring 4 is abutted against a positioning boss of a cylinder sleeve 6 sleeved on the center tube 1 through a thread, and the lower guide ring 4 and the cylinder sleeve 6 are fixed by a second fixing pin 7.

[0029] like Figure 2 As shown, the rubber cylinder assembly 3 includes a middle rubber cylinder 31 sleeved on the outer wall of the center tube 1 and end rubber cylinders 32 located at both ends of the middle rubber cylinder 31, and a support back ring 33 located on the outside of the end rubber cylinder 32 and clamping the end rubber cylinder 32. The outer wall of the center tube 1 is provided with a retaining ring 34 for positioning the middle rubber cylinder 31 at the position of the middle rubber cylinder 31, the outer wall of the center tube 1 is provided with a rubber cylinder spacer ring 35 at a position between the middle rubber cylinder 31 and the end rubber cylinder 32, and the outer wall of the center tube 1 is provided with an anti-drilling ring 36 at a position between the end rubber cylinder 32 and the support back ring 33. The upper guide ring 2 and the lower guide ring 4 are connected to the support back ring 33 by threaded contact.

[0030] Among them, the support back ring 33 adopts a bowl-shaped structure, the anti-drilling ring 36 is a triangular cross-section ring structure, the end rubber tube 32 is a bowl-shaped structure, and its hardness is higher than that of the middle rubber tube 31 with a semicircular groove convex structure designed in the middle, the rubber tube spacer ring 35 is a Z-shaped structure, the retaining ring 34 is a semicircular cross-section ring structure, the end rubber tube 32 and the middle rubber tube 31 are both made of fluororubber material, and the anti-drilling ring 36 is made of polyetheretherketone material. The entire rubber tube assembly 3 has adaptability, reliability and desirability under harsh and complex well conditions.

[0031] Combination Figure 1 and Figure 3As shown, the piston hydraulic transmission system component includes a lower guide ring 4 and a lower piston 8 sleeved on the center tube 1, the lower piston 8 is located inside the cylinder sleeve 6, and a limit splitting ring 9 sleeved on the center tube 1 is provided between the lower guide ring 4 and the lower piston 8. The limit splitting ring 9 is installed in the ring groove of the center tube 1 and fixed by a rubber ring 10. First pressure transmission holes are provided on both sides of the limit splitting ring 9, and a second pressure transmission hole is provided on the wall of the center tube 1. The second pressure transmission hole is connected to the inner hole of the center tube 1. The first pressure transmission hole of the limit splitting ring 9 connects the lower guide ring 4 and the piston cavity of the lower piston 8, thereby ensuring the smoothness of the pressure channel of the packer and limiting the lower guide ring 4 and the lower piston 8.

[0032] Among them, a first O-ring 11 and a group of first O-ring retaining rings 12 are arranged between the lower guide ring 4 and the cylinder sleeve 6, two second O-rings 13 and two groups of second O-ring retaining rings 14 are arranged between the lower guide ring 4 and the center tube 1, two first O-rings 11 and two groups of first O-ring retaining rings 12 are arranged between the lower piston 8 and the cylinder sleeve 6, and two second O-ring retaining rings 13 and two second O-ring retaining rings 14 are arranged between the lower piston 8 and the center tube 1, so as to ensure the sealing and pressure-bearing performance of the piston hydraulic transmission system components.

[0033] Combination Figure 1 and Figure 4 As shown, the locking system component includes a locking ring seat 15 sleeved and installed on the lower piston 8, and a locking ring 16 is installed between the lower piston 8 and the locking ring seat 15. The locking ring 16 adopts a C-shaped double-sided thread structure with inner and outer special-shaped sparse and dense one-way teeth. According to the set tooth direction, it can only move in one direction. The inner side of the locking ring 16 is threadedly locked with the lower piston 8, and the locking ring seat 15 generates a radial clamping force on the outer side of the locking ring 16 to maintain a stable seating clamping force. The outer side of the locking ring 16 is connected to the locking ring seat 15 by a thread and is fixed with an anti-rotation screw 17. The locking ring seat 15 is threadedly connected to the cylinder sleeve 6 and is provided with a first set screw 18. The outer side of the center tube 1 A shear sleeve 19 is provided on the lower end of the lower piston 8. The lower piston 8 is connected to the shear sleeve 19 by threads and is provided with a second set screw 20. The locking ring seat 15 is fixedly connected to the shear sleeve 19 by a piston starting pin 21. The locking ring seat 15 generates a radial clamping force on the outer side of the locking ring 16 to maintain a stable sealing clamping force. This can effectively prevent the rubber cylinder assembly 3 and the two-way integral barrel-shaped elastic slip 23 from expanding and anchoring and causing the hydraulic load to be removed after the sealing is removed, thereby ensuring the sealing pressure bearing capacity of the rubber cylinder assembly 3 and the anchoring bearing capacity of the slip, and reducing the risk of sealing failure of the packer rubber cylinder and slippage of the anchoring slip.

[0034] Combination Figure 1 and Figure 5As shown, the high-load slip anchor system assembly includes an upper cone 22, a bidirectional integral barrel-shaped elastic slip 23 and a lower cone 24, which are sequentially sleeved on the outer wall of the central tube 1 from top to bottom. The bidirectional integral barrel-shaped slip 23 is integrated into one body by the upper cone 22 and the lower cone 24. The upper cone 22 is threadedly connected to the shear sleeve 19, and a lower locking ring 25 sleeved on the outer wall of the central tube 1 is provided inside the upper end of the upper cone 22. The lower locking ring 25 and the upper cone 22 are directly provided with an anti-rotation screw. The lower cone 24 is threadedly connected with a lower joint sleeve 27 which is sleeved on the outer wall of the central tube 1. The surface of the bidirectional integral barrel-shaped elastic slip 23 is provided with evenly distributed and staggered grooves. The outer sides of the upper cone 22 and the lower cone 24 each have two evenly distributed grooves, and the grooves of the two are 90° offset relative to each other. The grooves corresponding to the upper cone 22, the lower cone 24 and the bidirectional integral barrel-shaped slip 23 are provided with slip anti-rotation key blocks 28, and are locked by a third set screw. 29 is used for fixing. An upper shear pin 41 which is threadedly connected and fixed is arranged between the upper end of the two-way integral barrel-shaped cava 23 and the upper vertebral body 22. A lower shear pin 42 which is threadedly connected and fixed is arranged between the lower end of the two-way integral barrel-shaped cava 23 and the lower vertebral body 24. At the same time, there are a plurality of threaded holes evenly distributed on the outer sides of the upper cone 22 and the lower cone 24. During the lowering process, the two-way integral barrel-shaped cava 23 can be effectively prevented from being sealed in advance by fixing the upper shear pin 41 and the lower shear pin 42. A third O-ring 43 and a third O-ring retaining ring 44 are arranged between the interior of the lower vertebral body 24 and the central pipe 1, which can effectively isolate and seal. A sawtooth thread is arranged on the outer circle of the middle and lower part of the central pipe 1. When the packer is recovered, the sawtooth thread moves to the lower locking ring 25 and engages with the inner teeth of the lower locking ring 25 in reverse. After the engagement, the upper vertebral body 22 is driven to move upward to release the two-way integral barrel-shaped cava 23 to release the locking force and drive the two-way integral barrel-shaped cava 23 to be recovered and the anchor is released.

[0035] Combination Figure 1 and Figure 6 As shown, the release claw release system assembly includes a lower joint connecting sleeve 27 and a release claw 46 sleeved on the outer wall of the central pipe 1, the upper end of the release claw 46 is threadedly connected to the central pipe 1, and the lower end is threadedly connected to the lower joint connecting sleeve 27, the lower end of the lower joint connecting sleeve 27 is threadedly connected to the lower joint 47 sleeved on the outer wall of the central pipe 1, and is fixed by a fourth set screw 48, a fourth O-ring 45 is padded between the lower joint 47 and the lower joint connecting sleeve 27, a release claw support body 49 is installed inside the release claw 46, an unsealing shear pin 50 is installed in the annular groove of the release claw support body 49 through the threaded hole of the release claw 46, two fifth O-rings 51 are arranged on the outer circle of the release claw support body 49 and form a seal with the lower joint 47, when the unsealing delivery tool 52 needs to unseal and recover the packer, it is thrown into the oil pipe from the wellhead, at the upper part of the release claw support body 49, and forms a surface seal with the release claw support body 49.

[0036] In this embodiment, an oil pipe thread is set at the upper end of the center pipe 1 to be connected with the oil pipe, a trapezoidal thread is set at the outer circle of the upper boss to be connected with the upper guide ring 2, a serrated thread is set at the middle and lower outer circle, and a trapezoidal thread is set at the lower end to be connected with the release claw 46. The serrated thread set at the middle and lower outer circle of the center pipe 1 can move to the lower locking ring 25 and engage with the inner teeth of the lower locking ring 25 in reverse when the packer is recovered. After engagement, the upper vertebral body 22 is driven to move upward to release the bidirectional integral barrel-shaped elastic cava 23 to release the locking force and drive the bidirectional integral barrel-shaped elastic cava 23 to be recovered and release the anchoring.

[0037] The working principle of this embodiment is described according to the working sequence of the packer, which is divided into three working states: entering the well, setting the packer and releasing the packer:

[0038] Well status: Figure 1 As shown, all components inside the packer are in the initial state, the number of the piston start pin 21 and the unsealing shear pin 50 is adjusted according to the setting and unsealing force values ​​designed by the process, and the packer is directly connected to the oil pipe and then lowered to the target layer;

[0039] Sealed status: Figure 1 and Figure 3 As shown, hydraulic pressure is applied from the oil pipe to the center pipe 1 from the ground to set the packer, and the hydraulic pressure enters the chamber between the lower guide ring 4, the cylinder sleeve 6 and the lower piston 8 from the second pressure transmission hole, pushing the lower guide ring 4 to move upward and the lower piston 8 to move downward. After the piston starting pin 21 is cut off, the lower guide ring 4 drives the cylinder sleeve 6, the lock ring seat 15, and the lock ring 16 to move upward, squeezing the rubber cylinder assembly 3 to expand the annular space gap between the seal and the inner wall of the casing, and the oil casing annulus is isolated at this time; the lower piston 8 drives the shear sleeve 19, the lower lock ring 25, the upper cone 22, and the bidirectional integral barrel elastic slip 23 to move downward, and the first First, cut off the lower shear pin 42 to make the lower end of the bidirectional integral barrel-shaped elastic slip 23 contact the casing, and then cut off the upper shear pin 41 to make the bidirectional integral barrel-shaped elastic slip 23 expand uniformly along the circumferential direction and anchor on the inner wall of the casing, thereby ensuring the integrity of the sealing performance of the rubber cylinder assembly 3 and the reliability of the anchoring performance of the bidirectional integral barrel-shaped elastic slip 23. The bidirectional integral barrel-shaped elastic slip 23 enables the packer to withstand both a large hanging weight and a high top force. The lower guide ring 4 and the upper vertebral body 22 are locked by the locking ring 16 and cannot produce axial retreat upward or downward. At this time, the packer is set;

[0040] Unblocking status: Figure 1 and Figure 6As shown, a special unsealing delivery tool 52 is lowered into the oil pipe, which freely falls onto the release claw support body 49 and forms a seal, and then the unsealing shear pin 50 on the release claw support body 49 is sheared by mechanical force or hydraulic pressure, and the unsealing shear pin 50 falls into the lower joint 47; then the central pipe 1 of the tubing column is lifted up to drive the release claw 46 to disengage from the lower joint connecting sleeve 27, and the central pipe 1 is continuously lifted up to drive the upper guide ring 2 to move upward to release the locking force of the rubber cylinder assembly 3 so that it retracts and unseals, and the serrated thread arranged on the outer circle of the middle and lower part of the central pipe 1 is continuously lifted up to engage the lower locking ring 25, and the lower locking ring 25 drives the upper vertebral body 22 to move upward to release the bidirectional integral barrel-shaped elastic cava 23 to release the locking force and drive the bidirectional integral barrel-shaped elastic cava 23 to be recovered and unanchored, and the overall unsealing of the packer is completed.

[0041] The large-diameter, high-temperature, high-pressure, and high-load suspension completion packer of the present invention has the characteristics of large diameter, high-temperature resistance, high-pressure difference resistance, and high load-bearing capacity; a two-way integral barrel-shaped slip structure has good anchoring performance; and can be better used in a single trip of tubing to achieve suspension support, acid fracturing, and completion construction.

[0042] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0043] The various aspects disclosed for describing the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the above description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present specification and claims, the detailed description will be omitted.

[0044] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A large-diameter, high-temperature, high-pressure, high-load suspension completion packer, characterized in that: It comprises a sealing system component, a locking system component, a piston hydraulic transmission system component, a high-load slip anchoring system component and a release claw release system component, which are sequentially sleeved on the outer wall of a central pipe (1) from top to bottom and are detachably connected to each other via threads.

2. According to claim 1, the large-diameter, high-temperature, high-pressure, high-load suspension completion packer is characterized by: The isolation sealing system assembly comprises an upper guide ring (2), a rubber sleeve assembly (3) and a lower guide ring (4) which are sequentially sleeved on the outer wall of the center tube (1) from top to bottom. The upper guide ring (2) and the lower guide ring (4) are connected to the rubber sleeve assembly (3) by means of threads. The upper end of the upper guide ring (2) is in contact with a positioning boss arranged on the upper end of the center tube (1) by means of threads, and the upper guide ring (2) and the center tube (1) are fixed by means of a first fixing pin (5). The lower end of the lower guide ring (4) is in contact with a positioning boss of a cylinder sleeve (6) sleeved on the center tube (1) by means of threads, and the lower guide ring (4) and the cylinder sleeve (6) are fixed by means of a second fixing pin (7).

3. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 2 is characterized by: The rubber tube assembly (3) comprises a middle rubber tube (31) sleeved on the outer wall of the center tube (1), end rubber tubes (32) located at both ends of the middle rubber tube (31), and a support back ring (33) located outside the end rubber tube (32) and clamping the end rubber tube (32). The outer wall of the center tube (1) is provided with a retaining ring (34) for positioning the middle rubber tube (31) at a position located on the middle rubber tube (31). The outer wall of the center tube (1) is provided with a rubber tube spacer ring (35) at a position located between the middle rubber tube (31) and the end rubber tube (32). The outer wall of the center tube (1) is provided with an anti-drilling ring (36) at a position located between the end rubber tube (32) and the support back ring (33). The upper guide ring (2) and the lower guide ring (4) are connected to the support back ring (33) by threaded contact.

4. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 3 is characterized by: The support back ring (33) is a bowl-shaped structure, the anti-drill ring (36) is a triangular cross-section ring structure, the end rubber tube (32) is a bowl-shaped structure, and its hardness is higher than that of the middle rubber tube (31) with a semicircular groove convex structure in the middle, the rubber tube spacer (35) is a Z-shaped structure, the retaining ring (34) is a semicircular cross-section ring structure, the end rubber tube (32) and the middle rubber tube (31) are both made of fluororubber material, and the anti-drill ring (36) is made of polyetheretherketone material.

5. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 2 is characterized in that: The piston hydraulic transmission system component comprises a lower guide ring (4) and a lower piston (8) sleeved on the center tube (1); the lower piston (8) is located inside the cylinder sleeve (6); a limit splitting ring (9) sleeved on the center tube (1) is provided between the lower guide ring (4) and the lower piston (8); the limit splitting ring (9) is installed in the ring groove of the center tube (1) and fixed by a rubber ring (10); first pressure transmission holes are provided on both sides of the limit splitting ring (9); a second pressure transmission hole is provided on the wall of the center tube (1); the second pressure transmission hole is connected to the inner hole of the center tube (1); and the first pressure transmission hole of the limit splitting ring (9) connects the lower guide ring (4) and the piston cavity of the lower piston (8).

6. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 5 is characterized by: A first O-ring seal (11) and a group of first O-ring retaining rings (12) are arranged between the lower guide ring (4) and the cylinder sleeve (6); two second O-ring seals (13) and two groups of second O-ring retaining rings (14) are arranged between the lower guide ring (4) and the center tube (1); two first O-ring seals (11) and two groups of first O-ring retaining rings (12) are arranged between the lower piston (8) and the cylinder sleeve (6); two second O-ring retaining rings (13) and two groups of second O-ring retaining rings (14) are arranged between the lower piston (8) and the center tube (1).

7. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 5 is characterized by: The locking system assembly comprises a locking ring seat (15) sleeved and installed on the lower piston (8), a locking ring (16) is installed between the lower piston (8) and the locking ring seat (15), the locking ring (16) adopts a C-shaped double-sided thread structure with inner and outer shaped sparse and dense one-way teeth, and can only move in one direction according to the set tooth direction, the inner side of the locking ring (16) is thread-locked with the lower piston (8), and the outer side of the locking ring (16) is connected to the locking ring seat (15) by threads and is provided with an anti-rotation The locking ring seat (15) is threadedly connected to the cylinder sleeve (6) and is provided with a first set screw (18); the outer wall of the central tube (1) is located at the lower end of the lower piston (8) and is provided with a shear sleeve (19); the lower piston (8) and the shear sleeve (19) are threadedly connected and are provided with a second set screw (20); the locking ring seat (15) and the shear sleeve (19) are fixedly connected by a piston starting pin (21).

8. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 7 is characterized in that: The high-load-bearing slip anchoring system assembly comprises an upper cone (22), a bidirectional integral barrel-shaped elastic slip (23) and a lower cone (24) which are sequentially sleeved on the outer wall of the central tube (1) from top to bottom. The bidirectional integral barrel-shaped slip (23) is integrated into one body through the upper cone (22) and the lower cone (24). The upper cone (22) is threadedly connected to the shear sleeve (19), and a lower locking ring (24) sleeved on the outer wall of the central tube (1) is provided inside the upper end of the upper cone (22). 25), the lower locking ring (25) and the upper vertebral body (22) are directly provided with an anti-rotation screw (26), the lower cone (24) is threadedly connected with a lower joint connecting sleeve (27) sleeved on the outer wall of the central tube (1), the surface of the bidirectional integral barrel-shaped elastic slip (23) is provided with evenly distributed and staggered grooves, the outer sides of the upper cone (22) and the lower cone (24) are each provided with two evenly distributed grooves, and the grooves of the two are both in a 90° offset relative relationship, and the upper cone (22) and the lower cone (24) are respectively provided with two evenly distributed grooves. The cone (24) and the grooves corresponding to the bidirectional integral barrel-shaped slip (23) are both provided with slip anti-rotation key blocks (28) and are fixed by a third set screw (29). An upper shear pin (41) is provided between the upper end of the bidirectional integral barrel-shaped slip (23) and the upper vertebral body (22) and a lower shear pin (42) is provided between the lower end of the bidirectional integral barrel-shaped slip (23) and the lower vertebral body (24). A third O-ring (43) and a third O-ring retaining ring (44) are provided between the interior and the center tube (1); a sawtooth thread is provided on the outer circle of the middle and lower part of the center tube (1); when the packer is recovered, the sawtooth thread moves to the lower locking ring (25) and engages with the inner teeth of the lower locking ring (25) in reverse direction, and after engagement, drives the upper vertebral body (22) to move upward to release the locking force of the bidirectional integral barrel-shaped cava (23) and drives the bidirectional integral barrel-shaped cava (23) to be recovered and release the anchoring.

9. The large-diameter, high-temperature, high-pressure, high-load suspension completion packer according to claim 8, characterized in that: The release claw release system assembly comprises the lower joint connection sleeve (27) and a release claw (46) sleeved on the outer wall of the central tube (1); the upper end of the release claw (46) is threadedly connected to the central tube (1), and the lower end is threadedly connected to the lower joint connection sleeve (27); the lower end of the lower joint connection sleeve (27) is threadedly connected to the lower joint (47) sleeved on the outer wall of the central tube (1), and is fixed by a fourth set screw (48); a fourth O-ring is provided between the lower joint (47) and the lower joint connection sleeve (27). (45), a release claw support body (49) is installed inside the release claw (46), and an unsealing shear pin (50) is installed in the annular groove of the release claw support body (49) through the threaded hole of the release claw (46). Two fifth O-rings (51) are arranged on the outer circle of the release claw support body (49) and form a seal with the lower joint (47). When the unsealing delivery tool (52) needs to unseal and recover the packer, it is placed in the oil pipe from the wellhead, on the upper part of the release claw support body (49), and forms a surface seal with the release claw support body (49).

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