Semi-permanent hydraulic well completion packer for ultra-deep oil and gas well and well completion operation device

Abstract

The utility model provides an ultra-deep oil gas well semi-permanent hydraulic well completion packer and a well completion operation device, which comprise an upper core shaft and a lower core shaft which are connected, and a first anchoring device, a rubber sleeve sealing device, a second anchoring device and a first setting piston device are sequentially arranged on the upper core shaft. A second setting piston device and an unsetting device are sequentially arranged on the lower mandrel, the first setting piston device and the second setting piston device are connected, a sealing device is arranged between the first setting piston device and the second setting piston device, and a sealing device is arranged between the first setting piston device and the upper mandrel; a sealing device is arranged between the second setting piston device and the lower mandrel, and the first setting piston device and the second setting piston device are used for pushing the first anchoring device, the rubber sleeve sealing device and the second anchoring device to achieve setting. The packer effectively packs the casing annulus of the oil and gas well, can resist high temperature of 232 DEG C, can resist the maximum pressure difference of 105 MPa, and provides technical support for well completion operation of the ultra-deep oil and gas well.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas wells, in particular to a semi-permanent hydraulic completion packer and a completion operation device for an ultra-deep oil and gas well. Background Art

[0002] Currently, the exploration and development of ultra-deep oil and gas wells has become a key approach to unlocking the potential of ultra-deep oil and gas resources and increasing oil and gas production. However, the development environment of these wells is extremely complex, with high bottomhole temperatures, enormous formation pressures, and extremely high well control risks, all of which pose unprecedented challenges to exploration and development. Therefore, to ensure the long-term and stable operation of ultra-deep oil and gas wells, permanent completion and isolation devices are widely used for completion operations.

[0003] In the field of completion packer design, although there are many design options, the single-setting piston design has been widely used due to its simple structure and low cost. However, this design also has obvious limitations. The single-setting piston has a relatively small setting force and is mostly small in diameter. This leads to frequent diameter mismatches when connecting the oil and gas well isolation completion device to the tubing. Due to the mismatched diameters, the difficulty of lowering the packer and replacing the fluid increases significantly, and it is also more likely to generate a throttling pressure difference. This throttling pressure difference not only affects the normal setting of the packer, but may also cause the packer to set prematurely, thereby increasing the risk of the completion string losing its seal.

[0004] In summary, given the challenges of existing packers in terms of setting force and drift matching, improving completion and isolation systems for ultra-deep oil and gas wells is crucial. This not only impacts the normal production of oil and gas wells but also directly impacts the efficiency and economic benefits of oil and gas resource development. Therefore, it is necessary to increase research and development efforts to explore more advanced and reliable completion and isolation system designs to address the various challenges encountered during the exploration and development of ultra-deep oil and gas wells and ensure the long-term stable operation of oil and gas wells. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the utility model provides a semi-permanent hydraulic completion packer and completion operation device for ultra-deep oil and gas wells. Through the design of double sealing pistons, the sealing force is significantly improved, and the large diameter of the device is guaranteed, so that the inner diameter of the pipe string matches the inner diameter of the oil pipe, avoiding the throttling pressure difference and premature sealing caused by inconsistent diameters, and realizing effective sealing of the casing annulus of the oil and gas well, providing technical support for the completion operation of ultra-deep oil and gas wells, and providing strong guarantee for the efficient exploration and development of ultra-deep energy.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a semi-permanent hydraulic completion packer for ultra-deep oil and gas wells, comprising an upper core shaft and a lower core shaft connected, a first anchoring device, a rubber sleeve sealing device, a second anchoring device and a first setting piston device are sequentially arranged on the upper core shaft along its axial direction, a second setting piston device is arranged on the lower core shaft along its axial direction, the first setting piston device and the second setting piston device are sealingly connected, the first setting piston device and the upper core shaft are sealingly connected, the second setting piston device and the lower core shaft are sealingly connected, the first setting piston device and the second setting piston device are used to push the first anchoring device, the rubber sleeve sealing device and the second anchoring device to achieve setting.

[0007] Furthermore, the first anchoring device includes an upper cava tube and an upper cava. The upper cava tube is connected to the upper core shaft through a first shear pin. An upper cava is provided in the cava groove of the upper cava tube. A first spring sheet is installed between the upper cava and the upper cava tube. The upper cone is connected to the upper cava tube through a second shear pin and is used to support the upper cava when sealing.

[0008] Furthermore, the rubber cartridge sealing device includes a rubber cartridge assembly and a lower guide ring, the lower guide ring and the second anchoring device are threadedly connected, and when setting, the second anchoring device pushes the lower guide ring to achieve expansion of the rubber cartridge assembly.

[0009] Furthermore, the second anchoring device includes a lower cone, a lower cava and a lower cava cylinder. The lower cone is threadedly connected to the rubber cylinder sealing device, and the lower cone is connected to the upper core shaft through a second locking ring. At the same time, a first shear pin is provided on the lower cone and the second locking ring; the lower cone is connected to the lower cava cylinder through a third shear pin; a lower cava is provided in the cava groove of the lower cava cylinder, and a second spring sheet is installed between the lower cava and the lower cava cylinder; the lower cava cylinder is connected to the secondary piston through a second shear pin.

[0010] Furthermore, the first sealing piston device includes a secondary piston and a secondary piston cylinder connected by threads and screws, and the secondary piston is sealed to the upper core shaft; a first support ring is provided between the secondary piston and the secondary piston cylinder, and the secondary piston is sealed to the secondary piston cylinder.

[0011] Furthermore, two O-rings are provided between the secondary piston and the upper core shaft.

[0012] Furthermore, two O-rings are provided between the secondary piston and the secondary piston cylinder.

[0013] Furthermore, the secondary piston cylinder is sealed to the lower core shaft, and the secondary piston cylinder is connected to the second setting piston device by using threads and screws.

[0014] Furthermore, two O-rings are provided between the secondary piston cylinder and the lower core shaft.

[0015] Furthermore, the second setting piston device includes a first-level piston and a first-level piston cylinder. The first-level piston is arranged in the first-level piston cylinder. The first-level piston and the first-level piston cylinder are sealed together, and the first-level piston and the lower core shaft are sealed together.

[0016] Furthermore, two O-rings are provided between the first-stage piston and the first-stage piston cylinder.

[0017] Furthermore, two O-rings are provided between the first-stage piston and the lower core shaft.

[0018] Furthermore, it also includes a first locking ring and a first locking ring sleeve. The secondary piston cylinder is connected to the first locking ring sleeve through a fourth shear pin. The first locking ring sleeve is connected to the primary piston cylinder by threads and screws. The first locking ring sleeve is connected to the primary piston by a first locking ring, and a second shear pin is provided between the first locking ring sleeve and the first locking ring. The secondary piston cylinder is connected to the primary piston by threads and screws.

[0019] Furthermore, an unsealing device is provided on the lower core shaft along its axial direction, and the unsealing device includes an unsealing pawl, an unsealing pin and a pawl support body. The unsealing pawl is threadedly connected to the lower core shaft, and the pawl support body is provided on the unsealing pawl, and an unsealing pin is provided between the unsealing pawl and the pawl support body; during unsealing, the unsealing pin is cut off by the unsealing tool, and the unsealing pawl loses the support of the pawl support body, thereby releasing the sealer.

[0020] Furthermore, an upper retaining ring, a dustproof ring and a pressure ring are provided in front of the first anchoring device on the upper core shaft. The upper retaining ring and the upper core shaft are connected by threads and screws. The dustproof ring is provided between the upper retaining ring and the pressure ring. The pressure ring and the upper cava cylinder are threadedly connected. When sealing, the first sealing piston device and the second sealing piston device push the pressure ring, and then the pressure ring pushes the dustproof ring to expand and open.

[0021] Furthermore, it also includes an upper joint and a lower joint, a threaded buckle is provided on the upper joint, and one end of the upper core shaft is threadedly connected to the upper joint; the first sealing piston device and the lower joint are connected by threads and screws, and a second support ring is provided between the first sealing piston device and the lower joint, and the first sealing piston device and the lower joint are sealed.

[0022] Furthermore, an O-ring is provided between the first setting piston device and the lower joint.

[0023] The utility model also provides a completion operation device for an oil and gas well. The packer in the completion operation device for the oil and gas well adopts the above-mentioned semi-permanent hydraulic completion packer for an ultra-deep oil and gas well.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The utility model provides a kind of ultra-deep oil and gas well semi-permanent hydraulic completion packer, by the design of double setting piston combination rubber seal device, significantly improve setting force (can reach 32 tons above), ensure the stable packing effect in ultra-deep oil and gas well.

[0026] Preferably, the utility model sets all sealing rings to the lower part of rubber seal device, avoids the phenomenon of completion string sealing failure caused by aging of sealing element in high pressure, high temperature environment, thereby prolongs the service life of packer.

[0027] Preferably, the utility model's releasing device has elasticity by mechanical slit cutting process, has radial contraction and opening function, is radially opened by support, and is connected with lower mandrel by thread.

[0028] In conclusion, the packer integrates first anchoring device, rubber seal device, second anchoring device, double setting piston device and releasing device and multiple functional modules, has compact structure and comprehensive function, can meet the complex working condition demand of ultra-deep oil and gas well, improves overall performance and reliability of packer by optimization design and material selection, reduces operation interruption and maintenance time caused by equipment failure, and improves operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is structural schematic view of the utility model ultra-deep oil and gas well semi-permanent hydraulic completion packer;

[0030] In the accompanying drawings: 1, threaded buckle; 2, upper joint; 3, upper mandrel; 4, first hexagon socket screw; 5, upper retaining ring; 6, dust ring; 7, pressure ring; 8, anti-rotation lock key; 9, first shear pin; 10, upper slip cylinder; 11, first spring plate; 12, second shear pin; 13, upper slip; 14, upper cone; 15, rubber cylinder assembly; 16, lower guide ring; 17, lower cone; 18, second locking ring; 19, lower slip; 20, third shear pin; 21, second spring plate; 22, lower slip cylinder; 23 , secondary piston; 24, first support ring; 25, second O-ring; 26, first O-ring; 27, secondary piston cylinder; 28, lower core shaft; 29, fourth shear pin; 30, first locking ring; 31, first locking ring sleeve; 32, third hexagon socket screw; 33, primary piston; 34, primary piston cylinder; 35, unsealing pawl; 36, fourth hexagon socket screw; 37, second support ring; 38, third O-ring; 39, unsealing pin; 40, pawl support; 41, lower joint. DETAILED DESCRIPTION

[0031] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0034] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] Figure 1 This is a detailed structural diagram of the semi-permanent hydraulic completion packer for ultra-deep oil and gas wells. Due to the packer's complex structure and long dimensions, the diagram is divided into two sections, connected by dashed lines, to more clearly illustrate its components and details. The right section primarily illustrates the structure of the packer's upper mandrel 3, while the left section primarily shows the structure of the lower mandrel 28. The dashed line connecting the two sections clearly illustrates their structural relationship and relative position.

[0038] like Figure 1 As shown, the utility model provides a semi-permanent hydraulic completion packer for ultra-deep oil and gas wells, which mainly includes an upper core shaft 3 and a lower core shaft 28. The upper core shaft 3 serves as the main support of the packer, and a first anchoring device, a rubber sleeve sealing device, a second anchoring device and a first setting piston device are carefully arranged along its axial direction, while the lower core shaft 28 carries an additional second setting piston device. Through the design of double setting pistons combined with the rubber sleeve sealing device, the setting force is significantly improved (up to more than 32 tons), ensuring a stable sealing effect in ultra-deep oil and gas wells.

[0039] Moreover, the upper core shaft 3 and the lower core shaft 28 of the present invention adopt a single-layer core shaft design, which achieves a consistent inner diameter of the entire pipe string, effectively avoids the throttling pressure difference caused by diameter change, and reduces the risk of premature setting of the packer.

[0040] The first setting piston device is sealedly connected to the upper core shaft 3, the second setting piston device is sealedly connected to the lower core shaft 28, and the first setting piston device is sealedly connected to the second setting piston device, which work together to ensure the stability and efficiency of the packer.

[0041] The specific configuration of the upper mandrel 3 is as follows:

[0042] The upper retaining ring 5, dust ring 6, pressure ring 7, upper slip ring 10, upper cone 14, rubber cylinder assembly 15, lower guide ring 16, lower cone 17, lower slip ring 22, secondary piston 23 and secondary piston cylinder 27 are sequentially sleeved on the upper core shaft 3. The upper retaining ring 5 and the upper core shaft 3 are connected by threads, and a first hexagon socket screw 4 is provided between the upper retaining ring 5 and the upper core shaft 3. The upper retaining ring 5 mainly serves as a support and positioning component for the dust ring 6 and the pressure ring 7. The fastening connection between the upper retaining ring 5 and the upper core shaft 3 ensures the stable position of the dust ring 6 and the pressure ring 7 under high pressure environment. During the sealing process, the upper retaining ring 5 also limits the upward movement range of the dust ring 6 and the pressure ring 7 to prevent excessive expansion or damage. The dust ring 6 is It is designed between the upper retaining ring 5 and the pressure ring 7 to play a sealing and dust-proof role; the pressure ring 7 and the upper slip tube 10 are connected by threads, which can transmit the high-pressure liquid pressure from the upper core shaft 3 to the upper slip tube 10, thereby pushing the slips in the slip tube to expand outward to achieve setting; an anti-rotation lock key 8 is provided between the upper slip tube 10 and the upper core shaft 3 to ensure that the upper slip tube 10 does not rotate under high pressure; the upper slip tube 10 is connected to the upper core shaft 3 through a first shear pin 9, and an upper slip 13 is provided in the slip groove of the upper slip tube 10. A first spring sheet 11 is installed between the upper slip 13 and the upper slip tube 10, and the upper cone 14 is connected to the upper slip tube 10 through a second shear pin 12 to prop open the upper slip 13 to achieve anchoring;

[0043] The rubber cylinder assembly 15 adopts a multi-component matching structure, consisting of a metal shoulder guard, a polymer shoulder guard, an end rubber cylinder, and a middle rubber cylinder. Expansion sealing is achieved through the push of the lower guide ring 16 and the lower cone 17.

[0044] The lower guide ring 16 and the lower cone 17 are connected by threads; the lower cone 17 is connected to the upper core shaft 3 by a second locking ring 18. At the same time, a first shear pin 9 is provided on the lower cone 17 and the second locking ring 18, which is used to push the lower slip cylinder 22 and the lower slip 19 to achieve anchoring; the lower cone 17 is connected to the lower slip cylinder 22 by a third shear pin 20; the lower slip 19 is provided in the slip groove of the lower slip cylinder 22, and a second spring sheet 21 is installed between the lower slip 19 and the lower slip cylinder 22; the lower slip cylinder 22 is connected to the secondary piston 23 by a second shear pin 12;

[0045] Two first O-rings 26 are provided between the secondary piston 23 and the upper core shaft 3; the secondary piston 23 and the secondary piston cylinder 27 are connected by threads, and a first hexagon socket screw 4 is provided between the secondary piston 23 and the secondary piston cylinder 27; a first support ring 24 and two second O-rings 25 are provided between the secondary piston 23 and the secondary piston cylinder 27;

[0046] The upper core shaft 3 and the lower core shaft 28 are connected by threads, and a first hexagon socket screw 4 is provided between the upper core shaft 3 and the lower core shaft 28; two second O-rings 25 are provided between the lower core shaft 28 and the secondary piston cylinder 27;

[0047] The lower mandrel 28 is specifically configured as follows:

[0048] The lower core shaft 28 is covered with a first locking ring sleeve 31, a first-level piston 33, a first-level piston cylinder 34 and an unsealing pawl 35; the second-level piston cylinder 27 is connected to the first locking ring sleeve 31 through a fourth shear pin 29; the first locking ring sleeve 31 is connected to the first-level piston cylinder 34 through a thread, and a third hexagon socket screw 32 is provided between the first locking ring sleeve 31 and the first-level piston cylinder 34; the first locking ring sleeve 31 is connected to the first-level piston 33 through a first locking ring 30, and a second shear pin is provided between the first locking ring sleeve 31 and the first locking ring 30 Nail 12; the secondary piston cylinder 27 is connected to the primary piston 33 by a thread, and a first hexagon socket screw 4 is provided between the secondary piston cylinder 27 and the primary piston 33; two first O-rings 26 are provided between the primary piston 33 and the lower core shaft 28, and two second O-rings 25 are provided between the primary piston 33 and the primary piston cylinder 34 to ensure sealing; the other end of the primary piston cylinder 34 is threadedly connected to the lower joint 41, and a fourth hexagon socket screw 36 is provided between the primary piston cylinder 34 and the lower joint 41; the unsealing pawl 35 is threadedly connected to the lower core shaft 28, a pawl support 40 is provided on the unsealing pawl 35, and an unsealing pin 39 is provided between the unsealing pawl 35 and the pawl support 40;

[0049] Preferably, it further comprises an upper joint 2 , on which a threaded buckle 1 is provided, and one end of an upper core shaft 3 is threadedly connected to the upper joint 2 .

[0050] Preferably, the assembly further includes a lower connector 41, which is connected to the first-stage piston cylinder 34. A second support ring 37 and a third O-ring 38 are disposed between the first-stage piston cylinder 34 and the lower connector 41. The second support ring 37 ensures stability and accuracy during the connection between the first-stage piston cylinder 34 and the lower connector 41. By providing an additional support surface, the support ring prevents component misalignment or loosening due to vibration or external forces. The third O-ring 38 utilizes the elasticity and deformation capacity of the rubber material to form an effective sealing barrier at the connection point, preventing liquid leakage. This sealing method is simple, reliable, and easy to maintain and replace.

[0051] When setting the seal, high-pressure liquid is injected into the completion string. The pressure of the high-pressure liquid acts on the end face of the first-stage piston 33 through the holes of the upper core shaft 3 and the lower core shaft 28, pressing and shearing the fourth shear pin 29 between the second-stage piston cylinder 27 and the first lock ring sleeve 31. The first-stage piston 33 moves upward, pushing the second-stage piston cylinder 27 to move toward the upper retaining ring 5, pressing and shearing the first shear pin 9 at the upper slip tube 10, and the pressure ring 7 pushes the dust ring 6 to expand and stretch. The slip sleeve 10 moves to the upper mandrel limit step, pressurizing and shearing the second shear pin 12 between the upper slip sleeve 10 and the upper cone 14. The upper cone 14 continues to move upward to open the upper slip 13. The pressure is continued, and the first-stage piston 33 continues to move toward the upper retaining ring 5. The lower guide ring 16 pushes the rubber sleeve assembly 15 to expand and open to form a seal, shearing the third shear pin 20 between the lower cone 17 and the lower slip sleeve 22, pushing the lower slip 19 to open and anchor, and finally setting it in the oil and gas well casing.

[0052] To release the seal, the unsealing tool is lowered. After passing through the pawl support 40, it is pulled upward and becomes stuck at the lower end of the support. The tubing is then lifted upward, driving the pawl support 40 to shear the unsealing pin 39 upward. The unsealing pawl 35 loses its support and is retracted. Continuing to lift the tubing upward drives the upper mandrel 3 and lower mandrel 28 upward, and also drives the upper slip cylinder 10 and lower slip cylinder 22 upward. The first spring leaf 11 and second spring leaf 21 cause the upper slip 13 and lower slip 19 to retract, and the rubber cylinder assembly 15 to retract, releasing the slip anchor.

[0053] Currently, completion packers primarily utilize two types of setting mechanisms: a single-setting piston design and a dual-setting piston design. This new semi-permanent hydraulic completion packer for ultra-deep oil and gas wells utilizes a dual-setting piston design, offering strong setting force and easy release. It offers higher setting force than a single-setting piston (capable of over 32 tons) while maintaining a large drift diameter. It also withstands temperatures of 232°C and a maximum pressure differential of 105 MPa. The release mechanism utilizes a dedicated tool-based release mechanism, allowing the release force to be adjusted by adjusting the number and material of the release pins.

[0054] The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells of this utility model sets the sealing parts (O-rings) under the sealing rubber cylinder to avoid the completion string losing the seal due to aging of the sealing parts during the pressure setting of the isolation completion device and the production process.

[0055] Currently, most of the existing oil and gas well completion packers are of small diameter. During the connection process between the oil and gas well isolation completion device and the oil pipe, the diameter shrinkage phenomenon occurs due to inconsistent diameters, which can easily lead to throttling pressure differences during the lowering of the packer and the replacement of fluids, and the premature setting of the packer. The semi-permanent hydraulic completion packer of the ultra-deep oil and gas well of the utility model can match the inner diameter of the oil pipe, making the inner diameter of the entire pipe string consistent, effectively avoiding the phenomenon of throttling pressure differences caused by diameter changes causing the packer to be sealed prematurely, and achieving the full-diameter effect of the completion pipe string.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0057] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present utility model and cannot be used to limit the scope of protection of the present utility model. Any changes made based on the technical solution in accordance with the technical concept proposed by the present utility model shall fall within the scope of protection of the claims of the present utility model.

Claims

1. A semi-permanent hydraulic completion packer for ultra-deep oil and gas wells, characterized by: The invention comprises an upper core shaft (3) and a lower core shaft (28) which are connected. A first anchoring device, a rubber sleeve sealing device, a second anchoring device and a first setting piston device are sequentially arranged on the upper core shaft (3) along its axial direction. A second setting piston device is arranged on the lower core shaft (28) along its axial direction. The first setting piston device is sealedly connected to the second setting piston device. The first setting piston device is sealedly connected to the upper core shaft (3). The second setting piston device is sealedly connected to the lower core shaft (28). The first setting piston device and the second setting piston device are used to push the first anchoring device, the rubber sleeve sealing device and the second anchoring device to achieve setting.

2. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 1, characterized in that: The first anchoring device includes an upper slip tube (10) and an upper slip (13), the upper slip tube (10) is connected to the upper core shaft (3) through a first shear pin (9), an upper slip (13) is provided in the slip groove of the upper slip tube (10), a first spring sheet (11) is provided between the upper slip (13) and the upper slip tube (10), and an upper cone (14) is connected to the upper slip tube (10) through a second shear pin (12) for supporting the upper slip (13) when setting.

3. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 1, characterized in that: The rubber cylinder sealing device comprises a rubber cylinder assembly (15) and a lower guide ring (16). The lower guide ring (16) is threadedly connected to the second anchoring device. When the seal is set, the second anchoring device pushes the lower guide ring (16) to achieve expansion of the rubber cylinder assembly (15).

4. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 3, characterized in that: The second anchoring device comprises a lower cone (17), a lower slip (19) and a lower slip cylinder (22); the lower cone (17) is threadedly connected to the rubber cylinder sealing device, the lower cone (17) is connected to the upper core shaft (3) through a second locking ring (18), and a first shear pin (9) is provided on the lower cone (17) and the second locking ring (18); the lower cone (17) is connected to the lower slip cylinder (22) through a third shear pin (20); a lower slip (19) is provided in the slip groove of the lower slip cylinder (22), and a second spring sheet (21) is installed between the lower slip (19) and the lower slip cylinder (22); the lower slip cylinder (22) is connected to the secondary piston (23) through a second shear pin (12).

5. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 1, characterized in that: The first setting piston device comprises a secondary piston (23) and a secondary piston cylinder (27) connected by threads and screws, and the secondary piston (23) is sealed to the upper core shaft (3); a first support ring (24) is provided between the secondary piston (23) and the secondary piston cylinder (27), and the secondary piston (23) and the secondary piston cylinder (27) are sealed.

6. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 5, characterized in that: Two O-rings are provided between the secondary piston (23) and the upper core shaft (3).

7. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 6, characterized in that: Two O-shaped sealing rings are provided between the secondary piston (23) and the secondary piston cylinder (27).

8. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 5, characterized in that: The secondary piston cylinder (27) and the lower core shaft (28) are sealed and connected, and the secondary piston cylinder (27) and the second setting piston device are connected by threads and screws.

9. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 8, characterized in that: Two O-shaped sealing rings are provided between the secondary piston cylinder (27) and the lower core shaft (28).

10. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 5, characterized in that: The second setting piston device includes a first-stage piston (33) and a first-stage piston cylinder (34). The first-stage piston (33) is arranged in the first-stage piston cylinder (34). The first-stage piston (33) and the first-stage piston cylinder (34) are sealed together. The first-stage piston (33) and the lower core shaft (28) are sealed together.

11. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 10, characterized in that: Two O-shaped sealing rings are provided between the first-stage piston (33) and the first-stage piston cylinder (34).

12. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 11, characterized in that: Two O-rings are provided between the first-stage piston (33) and the lower core shaft (28).

13. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 10, characterized in that: The utility model further comprises a first locking ring (30) and a first locking ring sleeve (31); the secondary piston cylinder (27) and the first locking ring sleeve (31) are connected via a fourth shear pin (29); the first locking ring sleeve (31) and the primary piston cylinder (34) are connected via threads and screws; the first locking ring sleeve (31) and the primary piston (33) are connected via the first locking ring (30); and a second shear pin (12) is provided between the first locking ring sleeve (31) and the first locking ring (30); the secondary piston cylinder (27) and the primary piston (33) are connected via threads and screws.

14. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 1, characterized in that: An unsealing device is also provided on the lower core shaft (28) along its axial direction, and the unsealing device includes an unsealing pawl (35), an unsealing pin (39) and a pawl support body (40). The unsealing pawl (35) is threadedly connected to the lower core shaft (28), the pawl support body (40) is provided on the unsealing pawl (35), and an unsealing pin (39) is provided between the unsealing pawl (35) and the pawl support body (40); when unsealing, the unsealing pin (39) is cut off by the unsealing tool, and the unsealing pawl (35) loses the support of the pawl support body (40), thereby releasing the packer.

15. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 2, characterized in that: An upper retaining ring (5), a dustproof ring (6) and a pressure ring (7) are also provided in front of the first anchoring device on the upper core shaft (3). The upper retaining ring (5) and the upper core shaft (3) are connected by threads and screws. The dustproof ring (6) is provided between the upper retaining ring (5) and the pressure ring (7). The pressure ring (7) and the upper slip cylinder (10) are threadedly connected. When the seal is set, the first seal piston device and the second seal piston device push the pressure ring (7), and then the pressure ring (7) pushes the dustproof ring (6) to expand and stretch.

16. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 1, characterized in that: The device further comprises an upper joint (2) and a lower joint (41), wherein a threaded buckle (1) is provided on the upper joint (2), and one end of the upper core shaft (3) is threadedly connected to the upper joint (2); the first setting piston device and the lower joint (41) are connected by threads and screws, a second support ring (37) is provided between the first setting piston device and the lower joint (41), and the first setting piston device and the lower joint (41) are sealed.

17. The semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to claim 16, characterized in that: An O-ring is provided between the first setting piston device and the lower joint (41).

18. A completion device for an oil and gas well, characterized in that: The packer in the oil and gas well completion device adopts the semi-permanent hydraulic completion packer for ultra-deep oil and gas wells according to any one of claims 1 to 17.

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