Packing device

Abstract

The invention provides a packing device which comprises a center pipe and a setting unit, a center flow channel allowing lower pressure flow to circulate is formed in the center pipe, the setting unit is connected outside the center pipe in a sleeving mode and comprises a first setting mechanism and a second setting mechanism arranged on the downstream portion of the first setting mechanism, and the second setting mechanism is arranged on the downstream portion of the second setting mechanism. The central pipe is sleeved with the balance cylinder and located between the first setting mechanism and the second setting mechanism, and the central pipe is provided with a pressure transmitting hole allowing lower pressure flow in the central flow channel to flow to the balance cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling and completion, and particularly to a packer device. Background Art

[0002] The main function of an underground casing packer in an oil and gas well is to isolate formation fluids and pressures, thereby ensuring the safety of the oil and gas well operation process. Currently, pulling up the tubing to release the packer is a commonly used method for releasing the underground casing packer. However, in oil and gas wells, especially in high-temperature and high-pressure wells, as well as in operations such as reservoir stimulation, production, testing, and well shut-in of oil and gas wells, the packer needs to withstand a relatively large lower pressure, which will cause a relatively large upward axial force on the tubing string. This axial force is likely to cause the tubing to move upward, shear the release pins, and result in the packer losing its sealing function.

[0003] The main feature of a packer that is released by pulling up the tubing is that the upper part of its central tube is connected to the tubing, and the lower part of the central tube is connected to the lower tubing. Generally, release pins are installed at a position near the lower part of the central tube, and the release force of the packer is controlled by the magnitude of the shearing force. When the central tube is pulled up to a certain tonnage and reaches the designed release force value, the release pins can be sheared, and by continuing to pull up the central tube, the packer can be released, thereby retrieving the packer. When the lower pressure is relatively large, the upward force acting on the cross-sectional area of the central tube due to the pressure, that is, the upward axial force caused by the downward pressure. When this axial force is relatively large, it may shear the release pins.

[0004] CN2017052800U discloses an insertable anchor permanent packer, which belongs to the technical field of downhole tools used in oil and gas well completion production tubing strings, and is composed of an upper joint, an insert tube, a compression cap, anchor claws, a sealing assembly, a central tube, upper and lower slips, an anti-rotation key, upper and lower cones, shear pins, an open expansion ring, an expansion ring, a rubber cylinder, a spacer ring, a lock ring sleeve, a lock ring, a sealing ring, a sealing ring, a piston, a piston sleeve, a setting shear pin, a stabilizing pin, and a lower joint. The upper joint, the insert tube, the anchor claws, the central tube, and the lower joint are sequentially threadedly connected. Although this device will not move due to axial force, it cannot be released by pulling up. Once the seal fails, only the milling method can be used, which is inconvenient for construction and costly.

[0005] Currently, for the design of a packer that is released by pulling up to avoid the influence of the upward axial force, there are the following technical solutions: First, by increasing the release pins or the shearing force of the pins to increase the release force and prevent accidental release. However, the problem brought about at the same time is that the release force of the packer is too large, and it may be difficult to retrieve the packer when it is necessary to retrieve the packer in the later stage of the oil well. Second, the packer is designed to use a ball or a release tool to retrieve the packer, that is, the packer cannot be directly released by pulling up the tubing. Instead, a ball is used or a release tool is sent down with the next tubing string. After the release structure is operated using the tool, the tubing is then pulled up to release and retrieve the packer. In this type of design, the axial force of the packer will not cause the packer to be released.

[0006] CN103334713B discloses an intubation packer, which includes a central pipe, an intubation sealing mechanism, an anchoring mechanism, a rubber barrel sealing mechanism, a setting and locking mechanism, and an unlocking and unjamming mechanism. The intubation sealing mechanism is arranged at the upper end inside the central pipe and fixedly connected to the central pipe. The anchoring mechanism, the rubber barrel sealing mechanism, and the setting and locking mechanism are sequentially sleeved on the central pipe, and the unlocking and unjamming mechanism is sleeved on the lower end of the central pipe. However, the packer in this device cannot achieve full bore, and it is difficult for the ball to reach the designated position after long-term production due to the influence of the downhole environment.

[0007] CN215108839U discloses a hydraulically retrievable intubation packer, which includes a core structure and an outer sleeve structure. The core structure includes an upper joint, a central pipe, and a release claw connected in sequence from top to bottom. The outer sleeve structure includes a stop ring, an upper slip sleeve, an upper slip, an upper cone, a rubber barrel protection sleeve, a rubber barrel, a lower cone, a lower slip body, a lower slip sleeve, a lock ring back ring, an upper cylinder sleeve, and a lower cylinder sleeve. The stop ring is sleeved on the upper part of the central pipe, and the outer thread of the lower part of the stop ring is connected to the upper slip sleeve. The head of the upper slip sleeve is connected to the upper slip through a dovetail chute, and the tail of the upper slip overlaps on the inclined chute of the upper cone. However, this device requires a downhole unlocking tool and an intubation is required to be matched with the upper part of the packer. Compared with the packer with a directly lifted unlocking structure, the process complexity is greatly increased, and the risk of pipe string failure will also increase.

[0008] Therefore, in the art, it is desired to provide a sealing device to solve the above technical problems. Summary of the Invention

[0009] The object of the present invention is to provide a sealing device, which can guide the lower pressure to the balance cylinder through a pressure transmission hole, and can balance and offset the axial force generated by the casing to make the sealing device move upward through the balance cylinder, so as to ensure that the central pipe cannot move upward, thereby further improving the plugging ability of the sealing device.

[0010] According to the present invention, there is provided a sealing device, including a central pipe, inside which a central flow channel allowing the lower pressure flow to pass through is formed.

[0011] A setting unit sleeved outside the central pipe, which includes a first setting mechanism, a second setting mechanism arranged downstream of the first setting mechanism, and

[0012] A balance cylinder sleeved outside the central pipe and located between the first setting mechanism and the second setting mechanism.

[0013] Wherein, a pressure transmission hole allowing the lower pressure flow in the central flow channel to flow to the balance cylinder is provided on the central pipe.

[0014] In one embodiment, the first setting mechanism includes a setting sleeve disposed upstream of the balance cylinder, a spring seat disposed within the setting sleeve, and a spring disposed within the setting sleeve and abutting against the joint and the spring seat respectively.

[0015] In one embodiment, the first setting mechanism further includes a limiting rod concentrically disposed within the spring. A gap is left between the first end of the limiting rod and the lower end surface of the setting sleeve in the initial state, and the second end is embedded within the joint.

[0016] In one embodiment, a plurality of spaced-apart one-way slips for anchoring on the inner wall of the casing are circumferentially disposed along the setting sleeve.

[0017] In one embodiment, the central tube includes a first central tube portion and a second central tube portion disposed downstream of the first central tube portion. The first setting mechanism is disposed on the first central tube portion, and the second setting mechanism is disposed on the second central tube portion.

[0018] In one embodiment, a radially inwardly extending protrusion is formed at the free end of the second central tube portion, and the pressure transmission hole is axially within the range of the protrusion.

[0019] In one embodiment, the packer device further includes a connecting sleeve sleeved outside the central tube and between the balance cylinder and the second setting mechanism. A gap is left between the connecting sleeve and the second central tube portion in the initial state.

[0020] In one embodiment, the second setting mechanism further includes a rubber cylinder seat sleeved outside the central tube and a rubber cylinder disposed downstream of the rubber cylinder seat.

[0021] In one embodiment, the packer device further includes a piston disposed downstream of the rubber cylinder.

[0022] The piston is configured to expand and seal the rubber cylinder within the casing under the action of an external force, and sequentially push the rubber cylinder seat, the connecting sleeve, the balance cylinder, and the setting sleeve upward to cause the one-way slips to anchor on the inner wall of the casing.

[0023] In one embodiment, a sealing ring is provided between the balance cylinder and the central tube.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] First, the present invention can guide the lower pressure into the balance cylinder through the pressure transmission holes, and can balance and offset the axial force generated by the casing to make the packer device move upward through the balance cylinder, so as to ensure that the central pipe cannot move upward, thereby further improving the plugging ability of the packer device.

[0026] In the present invention, when the lower pressure enters the balance cylinder, upward and downward loads will be generated in the balance cylinder respectively. Among them, on the one hand, since the one-way slip is anchored on the inner wall of the casing, the upward load in the balance cylinder will act on the sleeve through the one-way slip and dissipate; on the other hand, the downward load in the balance cylinder will act on the second central pipe part. In other words, the downward load in the balance cylinder will directly act on the central pipe, so that it can more easily balance and offset the axial force generated by the casing to make the packer device move upward, and then balance the upward force received by the central pipe, so as to further achieve the purpose of preventing the central pipe from having an upward movement trend.

[0027] Second, when the packer device is unloaded, due to the internal parts of the packer device being blocked by downhole solid particles, it is difficult to lift the pipe string to unload the packer device, and the required tonnage exceeds the design value, etc., the present invention can solve the above problems by increasing the annular pressure between the central pipe and the casing.

[0028] Specifically, the annular pressure between the central pipe and the casing can act on the outside of the balance cylinder, so as to generate an additional upward axial force on the central pipe, and then assist the central pipe to move upward to achieve the purpose of shearing the unloading pin and unloading the packer device.

[0029] Third, the present invention effectively reduces the possibility of accidental unloading during the lifting and unloading process, so that the packer device has stronger flexibility and a wider application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be described in detail below with reference to the drawings. In the drawings:

[0031] Figure 1 Schematically shows the structure of the packer device according to the present invention;

[0032] Figure 2 Is a half-sectional view of the packer device according to the present invention in the set state.

[0033] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. DETAILED DESCRIPTION OF THE INVENTION

[0034] In order to make the technical solutions and advantages of the present invention clearer and more understandable, the exemplary embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. And without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0036] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components.

[0037] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, the directional terms "upstream" or "above" or similar terms refer to the direction close to the wellhead, that is, Figure 1 the left direction in Figure 1 . The directional terms "downstream" or "below" or similar terms refer to the direction away from the wellhead, that is,

[0039] the right direction in

[0040] Figure 1 Schematically shows the structure of the packer device 100 according to the present invention;

[0041] Figure 2 Is a half-sectional view of the packer device 100 according to the present invention in the set state.

[0042] As Figure 1 shown, the packer device 100 according to the present invention includes a central tube 10 and a setting unit sleeved outside the central tube 10. Among them, the setting unit includes a first setting mechanism 20 and a second setting mechanism 30 arranged at intervals. Preferably, the second setting mechanism 30 is arranged upstream of the first setting mechanism 20.

[0043] In the present invention, after the packer device 100 is lowered into the casing, it can be successfully set in the casing through the first setting mechanism 20 and the second setting mechanism 30 respectively, which helps with subsequent downhole operations.

[0044] According to the present invention, as Figure 1 shown, the packer device 100 further includes a balance cylinder 40 sleeved outside the central tube 10. Preferably, the balance cylinder 40 is located between the first setting mechanism 20 and the second setting mechanism 30. In the present invention, an annular cavity is formed between the balance cylinder 40 and the central tube 10, and the annular cavity can receive the lower pressure from the central tube 10 through a pressure transmission hole 102 (introduced below).

[0045] In the present invention, the lower pressure is preferably a fluid pressure.

[0046] In one embodiment, as Figure 1 shown, a central flow channel 101 allowing the lower pressure to flow through is formed in the central tube 10, and a pressure transmission hole 102 is provided on the central tube 10. Preferably, the lower pressure acting on the central tube 10 can enter the annular cavity between the balance cylinder 40 and the central tube 10 through the central flow channel 101 and the pressure transmission hole 102, thereby balancing and offsetting the axial force generated by the casing to make the packer device 100 move upward, and further ensuring that the central tube 10 cannot move upward, so as to further improve the plugging ability of the packer device 100, the content of which is introduced below.

[0047] In one embodiment, as Figure 1 shown, the first setting mechanism 20 includes a setting sleeve 21 arranged upstream of the balance cylinder 40, and a spring seat 22 arranged inside the setting sleeve 21. Preferably, a chamber is formed inside the setting sleeve 21, and the spring seat 22 is arranged in the chamber.

[0048] In one embodiment, as Figure 1 shown, the first setting mechanism 20 further includes a spring 23 arranged in the chamber of the setting sleeve 21. And the packer device 100 further includes a joint 70 arranged above the first setting mechanism 20. Preferably, in the initial state, the upper end surface of the spring 23 axially abuts against the joint 70, and the lower end surface of the spring 23 axially abuts against the spring seat 22, which helps to limit the axial position of the spring 23 in the setting sleeve 21.

[0049] Preferably, the spring seat 22 is configured as an annular structure.

[0050] In one embodiment, as Figure 1 shown, the first setting mechanism 20 further includes a limiting rod 24 concentrically arranged inside the spring 23. Preferably, the second end (upper end surface) of the limiting rod 24 can be embedded into the joint 70, thereby improving the firmness and stability between the limiting rod 24 and the joint 70.

[0051] Preferably, the first end (lower end face) of the limiting rod 24 can extend through the spring seat 22, and in the initial state, a gap is left between the lower end face of the limiting rod 24 and the lower end face of the setting sleeve 21. Therefore, when the spring 23 is compressed under the action of an external force, the limiting rod 24 can move axially in the setting sleeve 21.

[0052] Correspondingly, when the lower end surface of the limiting rod 24 abuts against the lower end surface of the setting sleeve 21, the spring 23 is in a fully compressed state. It is easy to understand that during the subsequent unsealing, the spring 23 in a compressed state can provide a certain force to assist the unsealing of the one-way slip 25 (described below).

[0053] According to the present invention, Figure 1 As shown, a plurality of one-way slips 25 are arranged at intervals along the circumference of the setting sleeve 21. Preferably, when the setting sleeve 21 is pushed upward by an external force, the spring 23 will be compressed under the action of the spring seat 22 until the limit rod 24 axially abuts against the setting sleeve 21, and the spring 23 will be in a fully compressed state. At the same time, the one-way slips 25 will also follow the setting sleeve 21 upward and be smoothly anchored on the inner wall of the casing to achieve the setting of the isolation device 100.

[0054] Preferably, the sealing sleeve 21 is configured as a conical structure. Therefore, when the sealing sleeve 21 moves upward under the action of external force, it can apply a radially outward force to the one-way cava 25, so that the one-way cava 25 can be more easily anchored on the inner wall of the casing, so as to further improve the sealing ability of the isolation device 100.

[0055] In one embodiment, Figure 1 As shown, the central tube 10 includes a first central tube portion 11, and a second central tube portion 12 disposed downstream of the first central tube portion 11. Preferably, a radially inwardly extending protrusion 121 is formed at the free end of the second central tube portion 12, and the pressure transmission hole 102 is axially within the range of the protrusion 121, thereby facilitating the circulation of the lower pressure.

[0056] Preferably, a sleeve with a larger diameter is provided at the joint between the second central tube portion 12 and the first central tube portion 11. Accordingly, the second central tube portion 12 is threadedly connected with the first central tube portion 11 through the sleeve. In the present invention, the protrusion 121 is arranged at the upper end surface of the sleeve.

[0057] In the present invention, when the packer device 100 is subjected to a lower pressure, the lower pressure can sequentially enter the annular cavity between the balance cylinder 40 and the central pipe 10 through the central flow channel 101 and the pressure transmission hole 102. Preferably, the present invention can balance and offset the axial force generated by the casing to push the packer device 100 upward through the balance cylinder 40, thereby ensuring that the central pipe 10 cannot move upward, so as to further improve the plugging ability of the packer device 100, and its content will be introduced below.

[0058] In the present invention, after the lower pressure enters the balance cylinder 40, upward and downward loads will be generated in the balance cylinder 40 respectively.

[0059] Preferably, since the one-way slip 25 is anchored on the inner wall of the casing, the upward load in the balance cylinder 40 will act on the sleeve through the one-way slip 25 and be dissipated.

[0060] Preferably, the downward load in the balance cylinder 40 will act on the second central pipe part 12. In other words, the downward load in the balance cylinder 40 will directly act on the central pipe 10, so that it can more easily balance and offset the axial force generated by the casing to push the packer device 100 upward, and then balance the upward force acting on the central pipe 10, so as to further achieve the purpose of preventing the central pipe 10 from having an upward movement trend.

[0061] The present invention can ensure that the downward load in the balance cylinder 40 can completely balance and offset the upward force acting on the central pipe 10 by reasonably designing the cross-sectional area of the balance cylinder 40, so as to further ensure the downhole plugging ability of the packer device 100.

[0062] According to the present invention, as Figure 1 shown, the packer device 100 further includes a connecting sleeve 50 sleeved outside the central pipe 10. Preferably, the connecting sleeve 50 is located between the balance cylinder 40 and the second setting mechanism 30, so as to effectively transmit the axial load, and further ensure that the one-way slip 25 can be smoothly anchored on the inner wall of the casing.

[0063] Preferably, there is a gap between the connecting sleeve 50 and the connecting end of the second central pipe part 12. In this way, the axial movement distance of the connecting sleeve 50 can be effectively limited, so as to further ensure that the first setting mechanism 20 and the second setting mechanism 30 can be smoothly set in the casing.

[0064] In one embodiment, as Figure 1 shown, the second setting mechanism 30 further includes a rubber cylinder seat 31 sleeved outside the central pipe 10, and a rubber cylinder 32 arranged downstream of the rubber cylinder seat 31. And the packer device 100 further includes a piston 60 arranged downstream of the rubber cylinder 32.

[0065] In the present invention, if Figure 1 and 2 As shown, the piston 60 is configured to enable the rubber sleeve 32 to move upward and expand and seal in the sleeve under the action of external pressure, and to push the rubber sleeve seat 31, the connecting sleeve 50 and the balance cylinder 40 upward in sequence until the connecting sleeve 50 axially abuts against the second center pipe portion 12.

[0066] At the same time, the sealing sleeve 21 and the balance cylinder 40 will also move upward synchronously and compress the spring 23 until the limiting rod 24 axially abuts against the sealing sleeve 21. At this time, the one-way slip 25 will be anchored on the inner wall of the casing to realize the sealing of the isolation device 100.

[0067] Preferably, the first setting mechanism 20 is disposed on the first central tube portion 11, and the second setting mechanism 30 is disposed on the second central tube portion 12. In this way, the upward load and the downward load generated in the balancing cylinder 40 can be effectively balanced respectively.

[0068] Preferably, the upper end surface of the central pipe 10 in the present invention is connected to an oil pipe or a tubing string.

[0069] When the internal parts of the isolation device 100 are stuck due to solid particles in the well, it is difficult to lift the pipe string to unseal the isolation device 100, and the required tonnage exceeds the design value, the present invention can solve the above problems by increasing the annular space pressure between the central pipe 10 and the casing, which is described in detail below.

[0070] Preferably, the annular space pressure can act on the outside of the balance cylinder 40 , thereby generating additional upward axial force on the central pipe 10 , thereby assisting the central pipe 10 to move upward, so as to achieve the purpose of shearing the unsealing pin and unsealing the isolation device 100 .

[0071] In one embodiment, a sealing ring 401 is provided between the balancing cylinder 40 and the central tube 10. Preferably, the sealing ring 401 is provided between the balancing cylinder 40 and the first central tube portion 11 and the second central tube portion 12, respectively.

[0072] In this way, the balance cylinder 40 and the central tube 10 can have good sealing performance, thereby improving the ability to disperse the lower pressure, further ensuring that the lower pressure can be fully offset, thereby avoiding the tendency of the central tube 10 to move upward.

[0073] Compared with the prior art, the present invention has the following advantages:

[0074] First, the present invention can guide the lower pressure into the balance cylinder 40 through the pressure transmission hole 102, and can balance and offset the axial force generated by the casing that causes the isolation device 100 to move upward through the balance cylinder 40, thereby ensuring that the central pipe 10 cannot move upward, so as to further improve the sealing ability of the isolation device 100.

[0075] In the present invention, when the lower pressure enters the balance cylinder 40, upward and downward loads will be generated in the balance cylinder 40. On the one hand, since the one-way slip 25 is anchored on the inner wall of the casing, the upward load in the balance cylinder 40 will act on the sleeve through the one-way slip 25 and be dissipated; on the other hand, the downward load in the balance cylinder 40 will act on the second central pipe portion 12. In other words, the downward load in the balance cylinder 40 will directly act on the central pipe 10, so that it is easier to balance and offset the axial force generated by the casing that causes the isolation device 100 to move upward, and then balance the upward force on the central pipe 10, so as to further achieve the purpose of preventing the central pipe 10 from having an upward movement trend.

[0076] Secondly, when the internal parts of the isolation device 100 are stuck due to solid particles in the well, it is difficult to lift the pipe string to unseal the isolation device 100, and the required tonnage exceeds the design value, the present invention can solve the above problems by increasing the annular space pressure between the central pipe 10 and the casing.

[0077] Specifically, the annular space pressure between the central pipe 10 and the casing can act on the outside of the balance cylinder 40, thereby generating additional upward axial force on the central pipe 10, thereby assisting the central pipe 10 to move upward, so as to achieve the purpose of shearing the unsealing pins and unsealing the isolation device 100.

[0078] Thirdly, the present invention effectively reduces the possibility of accidental unsealing during the lifting and unsealing process, thereby making the sealing device 100 more flexible and applicable.

[0079] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the disclosure scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A packer device, comprising: A central tube (10) having a central flow passage (101) formed therein to allow the flow of lower pressure, A setting unit sleeved outside the central tube (10), which includes a first setting mechanism (20), a second setting mechanism (30) disposed downstream of the first setting mechanism (20), and A balance cylinder (40) sleeved outside the central tube (10) and located between the first setting mechanism (20) and the second setting mechanism (30), Wherein, a pressure transmission hole (102) is provided on the central tube (10) to allow the lower pressure flow in the central flow passage (101) to flow to the balance cylinder (40).

2. The packer device according to claim 1, characterized in that, The first setting mechanism (20) includes a setting sleeve (21) disposed upstream of the balance cylinder (40), a spring seat (22) disposed inside the setting sleeve (21), and a spring (23) disposed inside the setting sleeve (21) and abutting against a joint (70) and the spring seat (22) respectively.

3. The packer device according to claim 2, wherein The first setting mechanism (20) further includes a limiting rod (24) concentrically arranged inside the spring (23). A gap is left between the first end of the limiting rod (24) and the lower end surface of the setting sleeve (21) in the initial state, and the second end is embedded into the joint (70).

4. The packer device according to claim 3, characterized in that, A plurality of one-way slips (25) are circumferentially arranged along the setting sleeve (21) at intervals and are used for anchoring on the inner wall of the casing.

5. The packer device according to claim 4, characterized in that, The central tube (10) includes a first central tube portion (11) and a second central tube portion (12) disposed downstream of the first central tube portion (11). Wherein, the first setting mechanism (20) is disposed on the first central tube portion (11), and the second setting mechanism (30) is disposed on the second central tube portion (12).

6. The packer device according to claim 5, characterized in that, A radially inwardly extending protrusion (121) is formed at the free end of the second central tube portion (12), and the pressure transmission hole (102) is axially within the range of the protrusion (121).

7. The packer device according to claim 6, wherein The packer device further includes a connecting sleeve (50) sleeved outside the central tube (10) and located between the balance cylinder (40) and the second setting mechanism (30). A gap is left between the connecting sleeve (50) and the second central tube portion (12) in the initial state.

8. The packer device according to claim 7, characterized in that, The second setting mechanism (30) further includes a rubber cylinder seat (31) sleeved outside the central tube (10) and a rubber cylinder (32) disposed downstream of the rubber cylinder seat (31).

9. The packer device according to claim 8, characterized in that, The packer device further includes a piston (60) disposed downstream of the rubber cylinder (32), The piston (60) is configured to be able to expand and seal the rubber cylinder (32) in the casing under the action of an external force, and sequentially push the rubber cylinder seat (31), the connecting sleeve (50), the balance cylinder (40) and the setting sleeve (21) upward to cause the one-way slips (25) to anchor on the inner wall of the casing.

10. The packer device according to any one of claims 1 to 9, characterized in that, A sealing ring (401) is provided between the balance cylinder (40) and the central tube (10).

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