Multi-point release type expansion packer

Abstract

The invention relates to the field of packers, in particular to a multi-point release type expansion packer, and aims to relieve the technical problem of incomplete unsealing of the expansion packer in the prior art. The multi-point release type expansion packer comprises a central pipe, a connecting sleeve, an expansion rubber sleeve and a supporting sleeve. The central pipe is composed of a first connecting section, a second connecting section, a third connecting section and a fourth connecting section. A pressure transmitting hole is formed in the side wall of the first connecting section; the central pipe is sleeved with the connecting sleeve, one end of the connecting sleeve is connected with the central pipe through a shear pin, a first boss is formed on the inner wall of the connecting sleeve in a protruding mode, and the first boss is in sealing fit with the outer wall of the first connecting section; one end of the expansion rubber sleeve is in threaded connection with the other end of the connecting sleeve; the supporting sleeve is sleeved on the central pipe, is in sealing fit with the outer wall of the third connecting section and is in threaded connection with the other end of the expansion rubber sleeve. After the multi-point release type expansion packer is unsealed, pressure relief channels are formed at the upper end and the lower end of the expansion rubber sleeve, and therefore it can be guaranteed that pressure is completely released.

Description

Technical Field

[0001] This invention relates to the field of packers, and more particularly to a multi-point release expandable packer. Background Technology

[0002] Packers, as key tools for interlayer sealing, are commonly used in fracturing, acidizing, and water injection operations. They achieve interlayer sealing by using the elastic deformation of the rubber sleeve to make the sleeve fit against the inner wall of the tubing. Desealing is achieved by releasing the deformation stress of the rubber sleeve.

[0003] Currently used expander packers are primarily hydraulic expanders. Liquid is injected into the packer to expand it, allowing it to adhere to the tubing wall. Desealing is achieved by releasing the pressure of the liquid inside the packer. It should be noted that during desealing, because the expander packer has only one pressure relief channel, and the packer is in a deformed state for an extended period with one end floating, incomplete desealing can lead to re-seating during tubing stringing due to external forces such as suction. This is especially problematic when foreign objects are present in the well, potentially causing the packer to become stuck and leading to complex downhole conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-point release expandable packer to alleviate the technical problem of incomplete release of expandable packers in related technologies.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The multi-point release expandable packer provided by the present invention includes: a central tube, a connecting sleeve, an expandable rubber cylinder, and a support sleeve;

[0007] From one end of the central tube to the other end, the central tube is divided into a first connecting section, a second connecting section, a third connecting section and a fourth connecting section, with outer diameters of D1, D2, D3 and D4 respectively, wherein D1 > D2 and D3 > D4.

[0008] The first connecting section has pressure transmission holes on its side wall;

[0009] The connecting sleeve is fitted onto the central tube and is spaced apart from the central tube. One end of the connecting sleeve is connected to the central tube by a shear pin, and a first protrusion is formed on its inner wall.

[0010] In the axial direction of the connecting sleeve, the first boss is located between the shear pin and the pressure transmission hole, and is sealed to the outer wall of the first connecting section;

[0011] The expansion sleeve is fitted onto the central tube and spaced apart from the central tube, with one end of it threadedly connected to the other end of the connecting sleeve.

[0012] The support sleeve is fitted onto the central tube and seals against the outer wall of the third connecting section, and is also threadedly connected to the other end of the expansion tube.

[0013] Furthermore, the connecting sleeve includes a fixing section, and a second boss protrudes from the inner wall of the fixing section;

[0014] In the axial direction of the connecting sleeve, the second boss is spaced apart from the first boss and is located on the side of the first boss away from the pressure transmission hole;

[0015] A third protrusion is formed on the outer wall of the first connecting segment. The third protrusion is located between the first protrusion and the second protrusion, and is directly opposite the second protrusion, and is spaced apart from the second protrusion.

[0016] Furthermore, an upper connector is threaded onto one end of the central tube;

[0017] The shear pins are fixed to the upper connector and the fixing section.

[0018] Furthermore, a C-shaped ring is embedded on the inner wall of the support sleeve, and the inner wall of the C-shaped ring abuts against the outer wall of the third connecting section.

[0019] Furthermore, a pressure relief hole is provided on the side wall of the third connecting section, and the support sleeve is sealed in the pressure relief hole.

[0020] Furthermore, two sets of sealing rings are embedded on the inner wall of the support sleeve, and the two sets of sealing rings are distributed on both sides of the pressure relief hole.

[0021] Furthermore, the multi-point release expansion packer also includes sealing seats and compression springs, both located between the connecting sleeve and the first connecting section;

[0022] The sealing seat is sealed to the connecting sleeve and the first connecting section, and together with the connecting sleeve, the first connecting section and the first boss, forms a pressure transmitting cavity that communicates with the pressure transmitting hole.

[0023] The sealing seat can slide towards the expanding rubber cylinder under pressure conditions in the pressure transmission chamber to form a flow channel with the inner wall of the connecting sleeve;

[0024] One end of the compression spring is connected to the connecting sleeve, and the other end is connected to the end of the sealing seat away from the pressure transmission hole. The compression spring causes the sealing seat to tend to slide towards the pressure transmission hole.

[0025] Furthermore, the connecting sleeve includes a threaded unsealing section and a limiting section;

[0026] The distance between the unsealing section and the first connecting section is less than the distance between the limiting section and the first connecting section;

[0027] The sealing seat is composed of an integrally formed upper sealing section and a lower sealing section;

[0028] The upper sealing section is located between the unsealing section and the first connecting section, and is sealed to both the unsealing section and the first connecting section.

[0029] The lower sealing section is located between the limiting section and the first connecting section, and has a gap with the limiting section, and is sealed to the first connecting section.

[0030] Furthermore, a sealing sleeve is fitted at the end of the upper sealing section, and the inner and outer walls of the sealing sleeve abut against the outer wall of the first connecting section and the inner wall of the unsealing section, respectively.

[0031] Furthermore, a sealing ring is embedded on the inner wall of the lower sealing section, and the sealing ring abuts against the outer wall of the first connecting section.

[0032] In summary, the technical effects achieved by the multi-point release expansion packer provided by this invention are as follows:

[0033] In this multi-point release expansion packer, along the axial direction of the central tube, the connecting sleeve, the expansion sleeve, and the support sleeve are sequentially fitted onto the central tube, with adjacent ends threaded together. Since the connecting sleeve and the expansion sleeve are spaced apart from the central tube, the three together form an annulus with the central tube. Because the first boss on the inner wall of the connecting sleeve is in a sealing fit with the outer wall of the first connecting section, and the support sleeve is in a sealing fit with the outer wall of the third connecting section, when pressure is applied into the central tube, the pressure will enter the annulus between the first boss and the support sleeve through the pressure transmission hole, causing the expansion sleeve to expand and achieve setting.

[0034] As described above, during unsealing, when the central tube is lifted, since the expansion sleeve is in a set-sealed state, the connecting sleeve and support sleeve connected to the expansion sleeve are in a stationary state and exert downward resistance on the central tube. As the lifting force increases, the shear pin is cut off, and the central tube moves upward as a whole. When it moves to the point where the second connecting section is opposite the first boss and the fourth connecting section is opposite the support sleeve, since the outer diameter of the second connecting section is smaller than the outer diameter of the first connecting section and the outer diameter of the fourth connecting section is smaller than the outer diameter of the third connecting section, the sealing effect between the first boss and the first connecting section is lost, and a gap is formed between the first boss and the second connecting section. At this time, the liquid in the annular space can flow upward through this gap and leak into the central tube through the pressure transmission hole. The sealing effect between the support sleeve and the third connecting section is lost, and a gap is formed between the support sleeve and the fourth connecting section. At this time, the liquid in the annular space can flow downward through this gap and be discharged outside the central tube.

[0035] As can be seen, compared with the existing technology, this multi-point release expander packer forms pressure relief channels at both the upper and lower ends of the expander sleeve during the unsealing process, thereby ensuring complete pressure release. In addition, after unsealing, the pressure at both ends of the expander sleeve is balanced, the pressure inside and outside the packer is balanced, and the pressure inside the tubing and casing is balanced, so that the entire tool is in a balanced state, further ensuring that the expander sleeve can be completely retracted. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a cross-sectional view of a multi-point release expandable packer provided in an embodiment of the present invention;

[0038] Figure 2 A cross-sectional view of the central tube provided in an embodiment of the present invention;

[0039] Figure 3 A cross-sectional view of the sealing seat provided in an embodiment of the present invention;

[0040] Figure 4 A cross-sectional view of the connecting sleeve provided in an embodiment of the present invention;

[0041] Figure 5 for Figure 1 A schematic diagram of the seated state;

[0042] Figure 6 for Figure 1 A diagram illustrating the state of reopening.

[0043] Icons: 1-Central tube; 101-First connecting section; 102-Second connecting section; 103-Third connecting section; 104-Fourth connecting section; 105-Pressure transmission hole; 106-Third boss; 107-Pressure relief hole;

[0044] 2-Connecting sleeve; 201-First boss; 202-Fixing section; 203-Second boss; 204-Unsealing section; 205-Limiting section;

[0045] 3-Expansion sleeve; 4-Support sleeve; 5-Cut pin; 6-Upper connector; 7-C-ring; 8-Sealing ring;

[0046] 9-Sealing seat; 901-Upper sealing section; 902-Lower sealing section;

[0047] 10 - Compression spring; 11 - Sealing sleeve; 12 - Sealing ring. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0050] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] During the unsealing process, because the expansion packer has only one pressure relief channel, and the rubber sleeve is in a deformed state for a long time with one end floating, if the rubber sleeve is not completely unsealed and is in a slightly deformed state, the rubber sleeve may re-settle due to external forces such as suction during the stringing process. In particular, when there are foreign objects in the well, the rubber sleeve may become stuck, leading to complex downhole situations.

[0052] In view of this, the present invention provides a multi-point release expansion packer, comprising a central tube 1, a connecting sleeve 2, an expansion sleeve 3, and a support sleeve 4; from one end of the central tube 1 to the other end, the central tube 1 is sequentially divided into a first connecting section 101, a second connecting section 102, a third connecting section 103, and a fourth connecting section 104, with outer diameters of D1, D2, D3, and D4 respectively, wherein D1 > D2 and D3 > D4; a pressure transmission hole 105 is provided on the side wall of the first connecting section 101; the connecting sleeve 2 is sleeved on the central tube 1 and is connected to the central tube 1. The tubes 1 are spaced apart, and one end of each tube is connected to the central tube 1 by a shear pin 5. A first boss 201 protrudes from the inner wall of each tube. In the axial direction of the connecting sleeve 2, the first boss 201 is located between the shear pin 5 and the pressure transmission hole 105, and is sealed to the outer wall of the first connecting section 101. The expansion sleeve 3 is sleeved on the central tube 1 and spaced apart from the central tube 1, and one end of the expansion sleeve 3 is threaded to the other end of the connecting sleeve 2. The support sleeve 4 is sleeved on the central tube 1 and is sealed to the outer wall of the third connecting section 103, and is also threaded to the other end of the expansion sleeve 3.

[0053] In this multi-point release expansion packer, along the axial direction of the central tube 1, the connecting sleeve 2, the expansion sleeve 3, and the support sleeve 4 are sequentially fitted onto the central tube 1, with adjacent ends threaded together. Since the connecting sleeve 2 and the expansion sleeve 3 are spaced apart from the central tube 1, the three together form an annulus with the central tube 1. Since the first boss 201 on the inner wall of the connecting sleeve 2 is sealed to the outer wall of the first connecting section 101, and the support sleeve 4 is sealed to the outer wall of the third connecting section 103, when pressure is applied into the central tube 1, the pressure will enter the annulus between the first boss 201 and the support sleeve 4 through the pressure transmission hole 105, causing the expansion sleeve 3 to expand and achieve a setting seal.

[0054] As described above, during unsealing, when the central tube 1 is lifted, since the expansion sleeve 3 is in a seated state, the connecting sleeve 2 and the support sleeve 4 connected to the expansion sleeve 3 are in a stationary state and generate downward resistance to the central tube 1. As the lifting force increases, the shear pin 5 is cut off, and the central tube 1 moves upward as a whole. When it moves to the point where the second connecting section 102 is opposite to the first boss 201 and the fourth connecting section 104 is opposite to the support sleeve 4, since the outer diameter of the second connecting section 102 is smaller than the outer diameter of the first connecting section 101 and the outer diameter of the fourth connecting section 104 is smaller than the outer diameter of the third connecting section 103, the sealing effect between the first boss 201 and the first connecting section 101 is lost, and a gap is formed between them and the second connecting section 102. At this time, the liquid in the annular space can flow upward through this gap and leak into the central tube 1 through the pressure transmission hole 105. The sealing effect between the support sleeve 4 and the third connecting section 103 is lost, and a gap is formed between it and the fourth connecting section 104. At this time, the liquid in the annular space can flow downward through this gap and be discharged outside the central tube 1.

[0055] As can be seen, compared with the existing technology, this multi-point release expander packer forms pressure relief channels at both the upper and lower ends of the expander sleeve 3 during the unsealing process, thereby ensuring complete pressure release. In addition, after unsealing, the pressure at both ends of the expander sleeve 3 is balanced, the pressure inside and outside the packer is balanced, and the pressure inside the tubing and casing is balanced, so that the entire tool is in a balanced state, further ensuring that the expander sleeve 3 can be completely retracted.

[0056] The following combination Figures 1 to 6 The structure and shape of the multi-point release expansion packer provided in this embodiment are described in detail below:

[0057] refer to Figures 1 to 4The upper end of the central tube 1 is threadedly connected to the upper connector 6, and the inner wall of the upper connector 6 is sealed to the outer wall of the central tube 1 by a sealing ring 8. From top to bottom, the connecting sleeve 2 is divided into a fixing section 202, a releasing section 204, and a limiting section 205. The upper end of the fixing section 202 overlaps with the upper connector 6 and is fixedly connected to the upper connector 6 by a shear pin 5. A second boss 203 protrudes from the inner wall of the fixing section 202 and abuts against the lower end of the upper connector 6. The upper and lower ends of the releasing section 204 are threadedly connected to the fixing section 202 and the limiting section 205, respectively. A first boss 201 is formed on the inner wall of the releasing section 204. The lower end of the limiting section 205 is threadedly connected to the expansion sleeve 3. A third boss 106 protrudes from the outer wall of the first connecting section 101. The third boss 106 is close to the first boss 201 and directly opposite the second boss 203. The inner wall of the support sleeve 4 is fitted with a C-shaped ring 7 and two sets of sealing rings 8; the inner wall of the C-shaped ring 7 abuts against the outer wall of the third connecting section 103; the side wall of the third connecting section 103 is provided with a pressure relief hole 107, and the two sets of sealing rings 8 are distributed on both sides of the pressure relief hole 107.

[0058] Following the above, the multi-point release expansion packer also includes a sealing seat 9 and a compression spring 10, both located between the connecting sleeve 2 and the first connecting section 101. Specifically, the sealing seat 9 consists of an integrally formed upper sealing section 901 and a lower sealing section 902; wherein, the upper sealing section 901 is located between the unsealing section 204 and the first connecting section 101, and a sealing sleeve 11 is fitted on its upper part, with the inner and outer walls of the sealing sleeve 11 abutting against the outer wall of the first connecting section 101 and the inner wall of the unsealing section 204, respectively; the lower sealing section 902 is located between the limiting section 205 and the first connecting section 101, and has a gap with the limiting section 205, and its upper end abuts against the lower end of the unsealing section 204, with a sealing ring 12 embedded on its inner wall, and the sealing ring 12 abutting against the outer wall of the first connecting section 101. The upper end of the compression spring 10 is connected to the lower end of the lower sealing section 902, and the lower end is connected to the step of the limiting section 205.

[0059] In application, the multi-point release expander packer is connected to the tubing and lowered into the casing together. After reaching the designated position, and when setting the packer is required, pressure is applied into the tubing, combined with... Figure 1 As shown, pressure enters the annulus formed by the first boss 201, the unsealing section 204, the sealing seat 9, and the first connecting section 101 through the pressure transmission hole 105 on the central tube 1, and acts on the sealing seat 9; when the pressure acting on the sealing seat 9 is greater than the elastic force of the compression spring 10, the sealing seat 9 slides downward, away from the unsealing section 204, and releases the sealing effect between the upper sealing section 901 and the unsealing section 204. At this time, the liquid will flow through the gap between the sealing seat 9 and the limiting section 205 into the inner cavity of the expanding rubber cylinder 3. In this way, the expanding rubber cylinder 3 expands under the action of hydraulic pressure, realizing the setting seal. Figure 5As shown; after expansion to the desired position, the pressure at the upper and lower ends of the sealing seat 9 is balanced. At the same time, with the restoring force of the compression spring 10, the sealing seat 9 resets and abuts against the lower end of the unsealing section 204 again. At this time, the sealing seat 9, the unsealing section 204, the limiting section 205, the expansion tube 3, the support sleeve 4, the third connecting section 103, the second connecting section 102, and the first connecting section 101 together form a sealing cavity to prevent liquid leakage, thereby ensuring the effectiveness of the setting of the expansion tube 3.

[0060] As mentioned above, when lifting the lockdown, refer to... Figure 6 When the oil pipe is lifted, it exerts an upward pulling force on the upper connector 6. As the pulling force increases, the shear pin 5 is cut off, and then the upper connector 6 drives the central tube 1 to move upward synchronously. Since the expansion sleeve 3 is in a seated state, the expansion sleeve 3, as well as the shear pin 5, the fixing section 202, the unsealing section 204, the sealing sleeve 11, the sealing ring 12, the sealing seat 9, the compression spring 10, the limiting section 205, the C-ring 7, and the support sleeve 4 that are directly or indirectly connected to the expansion sleeve 3, are in a stationary state during the upward movement of the upper connector 6.

[0061] Continuing from the above, as the central tube 1 moves upward, the third protrusion 106 approaches the second protrusion 203. When the two come into contact, the central tube 1 sequentially passes through the fixing section 202, the unsealing section 204, and the limiting section 205 to exert an upward stretching and unsealing effect on the expansion tube 3. At the same time, the first protrusion 201, the sealing sleeve 11, and the sealing seat 9 are directly opposite the second connecting section 102, losing their sealing effect with the central tube 1. At this time, the liquid inside the expansion tube 3 flows upward and is released.

[0062] Continuing from the above, when the liquid flows upward and is released, the C-ring 7 moves to the fourth connecting section 104, thereby resetting and locking onto the central tube 1. It works simultaneously with the support sleeve 4 to pull down and release the expansion tube 3. At the same time, the two sets of sealing rings 8 on the support sleeve 4 are also aligned with the fourth connecting section 104. The seal between the support sleeve 4 and the central tube 1 is lost, and the liquid in the expansion tube 3 flows downward and is released through the gap between the support sleeve 4 and the central tube 1. The pressure relief hole 107 is opposite to the inner wall of the expansion tube 3, and the liquid is also released from the pressure relief hole 107 into the central tube 1.

[0063] With the above design, during the unsealing process, the upper end of the expansion sleeve 3 is subjected to a lifting force, and the lower end is subjected to a downward force. In addition to the pressure relief hole 107, there are two pressure relief channels at the upper and lower ends of the expansion sleeve 3. At the same time, the interior of the central tube 1, the inner cavity of the expansion sleeve 3, and the exterior of the expansion sleeve 3 (i.e., the annulus between the tubing and the casing) are all connected and the pressure is balanced. In this way, it is ensured that the pressure can be completely released, so that the expansion sleeve 3 can be completely retracted. During the stringing process, the expansion sleeve 3 will not be resealed due to suction pressure or other external forces, thus avoiding the occurrence of complex accidents.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-point release expandable packer, characterized in that, include: The central tube (1), connecting sleeve (2), expansion sleeve (3), and support sleeve (4) are included. From one end of the central tube (1) to the other end, the central tube (1) is divided into a first connecting section (101), a second connecting section (102), a third connecting section (103) and a fourth connecting section (104), with the outer diameters of each section being D1, D2, D3 and D4, respectively, and D1 > D2 and D3 > D4. The first connecting section (101) has a pressure transmission hole (105) on its side wall; The connecting sleeve (2) is fitted onto the central tube (1) and spaced apart from the central tube (1), and one end of it is connected to the central tube (1) by a shear pin (5), and a first boss (201) is formed on its inner wall. In the axial direction of the connecting sleeve (2), the first boss (201) is located between the shear pin (5) and the pressure transmission hole (105), and is sealed to the outer wall of the first connecting section (101); The expansion sleeve (3) is sleeved on the central tube (1) and spaced apart from the central tube (1), and one end of it is threadedly connected to the other end of the connecting sleeve (2); The support sleeve (4) is fitted onto the central tube (1) and is sealed to the outer wall of the third connecting section (103), and is also threaded to the other end of the expansion tube (3).

2. The multi-point release expandable packer according to claim 1, characterized in that, The connecting sleeve (2) includes a fixed section (202), and a second boss (203) is formed protruding on the inner wall of the fixed section (202); In the axial direction of the connecting sleeve (2), the second boss (203) is spaced apart from the first boss (201) and is located on the side of the first boss (201) away from the pressure transmission hole (105); A third protrusion (106) is formed on the outer wall of the first connecting segment (101). The third protrusion (106) is located between the first protrusion (201) and the second protrusion (203), and is directly opposite the second protrusion (203), and is spaced apart from the second protrusion (203).

3. The multi-point release expandable packer according to claim 2, characterized in that, One end of the central tube (1) is threaded with an upper connector (6); The shear pin (5) is fixed to the upper connector (6) and the fixing section (202).

4. The multi-point release expandable packer according to claim 2, characterized in that, A C-shaped ring (7) is embedded on the inner wall of the support sleeve (4), and the inner wall of the C-shaped ring (7) abuts against the outer wall of the third connecting section (103).

5. The multi-point release expandable packer according to claim 1, characterized in that, The third connecting section (103) has a pressure relief hole (107) on its side wall, and the support sleeve (4) is sealed in the pressure relief hole (107).

6. The multi-point release expandable packer according to claim 5, characterized in that, Two sets of sealing rings (8) are embedded on the inner wall of the support sleeve (4), and the two sets of sealing rings (8) are distributed on both sides of the pressure relief hole (107).

7. The multi-point release expandable packer according to any one of claims 1 to 6, characterized in that, The multi-point release expansion packer also includes a sealing seat (9) and a compression spring (10) located between the connecting sleeve (2) and the first connecting section (101); The sealing seat (9) is sealed to the connecting sleeve (2) and the first connecting section (101), and together with the connecting sleeve (2), the first connecting section (101) and the first boss (201) form a pressure transmission cavity that communicates with the pressure transmission hole (105). The sealing seat (9) can slide towards the expansion cylinder (3) under the pressure condition in the pressure transmission chamber to form a flow channel with the inner wall of the connecting sleeve (2); One end of the compression spring (10) is connected to the connecting sleeve (2), and the other end is connected to the end of the sealing seat (9) away from the pressure transmission hole (105). The compression spring (10) causes the sealing seat (9) to have a tendency to slide towards the pressure transmission hole (105).

8. The multi-point release expandable packer according to claim 7, characterized in that, The connecting sleeve (2) includes a threaded unsealing section (204) and a limiting section (205); The distance between the unsealing section (204) and the first connecting section (101) is less than the distance between the limiting section (205) and the first connecting section (101); The sealing seat (9) is composed of an integrally formed upper sealing section (901) and a lower sealing section (902); The upper sealing section (901) is located between the unsealing section (204) and the first connecting section (101), and is sealed to both the unsealing section (204) and the first connecting section (101); The lower sealing section (902) is located between the limiting section (205) and the first connecting section (101), and has a gap with the limiting section (205), and is sealed to the first connecting section (101).

9. The multi-point release expandable packer according to claim 8, characterized in that, The upper sealing section (901) is fitted with a sealing sleeve (11) at its end. The inner and outer walls of the sealing sleeve (11) abut against the outer wall of the first connecting section (101) and the inner wall of the unsealing section (204), respectively.

10. The multi-point release expandable packer according to claim 8, characterized in that, A sealing ring (12) is embedded on the inner wall of the lower sealing section (902), and the sealing ring (12) abuts against the outer wall of the first connecting section (101).

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