Compression-type multiple-unpacking packer

Abstract

The utility model discloses a compression formula multiple deblocking mode packer, including from top to bottom the upper joint, central tube, lower central tube, lower joint that are connected in proper order with screw thread and constitute packer center passage, and the outer central tube is provided with the balance piston, rubber cylinder from top to bottom in proper order in the outer central tube, and the rubber cylinder both ends are provided with the upper rubber cylinder seat and lower rubber cylinder seat for fixed respectively, and the central tube lower part is provided with the main seat seal piston, upper piston cover from top to bottom in proper order, and the lower central tube outside is provided with the vice seat seal piston, lower piston cover, deblocking piston from top to bottom in proper order. The utility model discloses a compression formula multiple deblocking mode packer solves the existing packer in use, and the stratum sand production is easy to cause the pipe column in the process of pipe column and deblocks difficult problem.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil production equipment in the petroleum industry, specifically relating to a compression-type packer with multiple unsealing methods. Background Technology

[0002] In recent years, low-permeability unconventional oil and gas resources have accounted for 70% of China's newly discovered oil and gas reserves, making them the main battleground for oil and gas field development. Horizontal well production technology improves reservoir conductivity and increases single-well production through fracturing and supplementary energy development. However, due to the long horizontal well sections, numerous fracturing clusters, and the coexistence of natural and artificial fractures caused by microfractures, water breakthrough in horizontal wells is inevitable during production. This leads to pressure imbalances between sections, large variations in wellhead fluid volume and water cut, and interference between sections within the formation, resulting in suppressed production in some low-water-cut sections. This creates prominent problems of production interference within horizontal well clusters and uneven production across sections. In particular, uneven reservoir pressure between sections significantly inhibits production, leading to a reduction in overall output and severely impacting the development effectiveness of horizontal wells. Currently, the main approach is to isolate low-pressure sections to redistribute wellbore pressure and improve the inflow profile to increase overall production. However, in practical applications, during the integrated segmented oil production process of well plugging detection in oilfields, when multiple packers are used, sand production from the formation can easily cause difficulties in unsealing the tubing string during the string pulling process, leading to major workover accidents that are difficult to handle and have long operation cycles. Conventional packers are limited by their own unsealing methods, resulting in a high probability of getting stuck during the lifting process, and the number of combinations is limited. These problems seriously affect the effectiveness of field use.

[0003] Currently, in the process of integrated well plugging and segmented oil production in oilfields, during the multi-stage use of packers, formation sand production can easily cause difficulties in unsealing the tubing string during the string lifting process, leading to major workover accidents. These accidents are difficult to handle and have long operation cycles. Conventional packers, limited by their own unsealing methods, have a high probability of getting stuck during the lifting process, limiting the number of packers that can be used, which seriously affects their field application. Utility Model Content

[0004] The purpose of this invention is to provide a compression-type packer with multiple release methods. It solves the problem that existing packers, when used, often cause difficulties in releasing the packer during the string erection process due to formation sand production.

[0005] The technical solution adopted in this utility model is as follows: a compression-type packer with multiple unsealing methods, comprising an upper connector, a central tube, a lower central tube, and a lower connector that are threaded together from top to bottom to form the central channel of the packer. An outer central tube is sleeved in the middle of the central tube. A balance piston and a rubber sleeve are sleeved on the outside of the outer central tube from top to bottom. An upper rubber sleeve seat and a lower rubber sleeve seat are respectively provided at both ends of the rubber sleeve for fixing. A main seat piston and an upper piston sleeve are sleeved on the lower part of the central tube from top to bottom. A secondary seat piston, a lower piston sleeve, and an unsealing piston are sleeved on the outside of the lower central tube from top to bottom.

[0006] The technical solution adopted in this utility model is also characterized by:

[0007] Furthermore, one end of the main seat piston has a pressure guide hole that communicates with the central channel, and the other end contacts the lower rubber sleeve seat. The upper piston sleeve is fitted outside the main seat piston and is threadedly connected to the lower rubber sleeve seat.

[0008] Furthermore, the balance piston is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat, while the other end is connected to the pressure cap.

[0009] Furthermore, one end of the auxiliary seat piston has a pressure guide hole that communicates with the central channel, and the other end is in contact with the upper piston sleeve.

[0010] Furthermore, the unsealing piston has a pressure guide hole at one end that communicates with the central channel, and a locking ring at the other end, which is fitted onto the lower connector.

[0011] Furthermore, the upper end of the lower connector is connected to a retaining ring by a thread, and a shear pin sleeve is fixedly fitted on the retaining ring by a setting pin.

[0012] Furthermore, a locking sleeve and a support ring are fixedly fitted onto the lower connector by means of a release pin.

[0013] Furthermore, the upper connector jacket is equipped with an upper balancing ring.

[0014] Furthermore, a sealing ring I is provided at the connection between the upper connector and the central tube.

[0015] Furthermore, a sealing ring II is provided at the junction of the balance piston and the upper rubber sleeve seat.

[0016] Furthermore, a sealing ring III is provided at the connection position between the unlocking piston and the locking ring.

[0017] The beneficial effects of this utility model are:

[0018] This utility model's compression-type packer with multiple unsealing methods has two unsealing methods: lifting the tubing string and applying internal pressure to the tubing. It can withstand bidirectional pressure differentials and can be used in multiple stages. It is particularly suitable for oilfield exploration and development, especially for multi-stage packing of horizontal sections in horizontal wells.

[0019] This utility model features a compression-type packer with multiple unsealing methods. It adopts a small-diameter rigid body structure of Ø105 to ensure the passability of horizontal well sections. It is hydraulically set without slips. During unsealing, the tubing string is lifted or the tubing is pressurized to break the unsealing pin. The packer is then retrieved using a rubber sleeve, ensuring that the packer can be safely removed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall device of this utility model.

[0021] In the diagram, 1. Upper connector, 2. Upper balance ring, 3. Sealing ring I, 4. Pressure cap, 5. Balance piston, 6. Sealing ring II, 7. Upper rubber sleeve seat, 8. Central tube, 9. Outer central tube, 10. Rubber sleeve, 11. Lower rubber sleeve seat, 12. Main seat sealing piston, 13. Upper piston sleeve, 14. Lower central tube, 15. Auxiliary seat sealing piston, 16. Lower piston sleeve, 17. Unsealing piston, 18. Sealing ring III, 19. Locking ring, 20. Support ring, 21. Unsealing pin, 22. Locking sleeve, 23. Shear pin sleeve, 24. Sealing pin, 25. Retaining ring, 26. Lower connector. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] The subject matter of this utility model disclosure will now be described more fully with reference to exemplary embodiments. However, the disclosed concepts may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. (By referring to the accompanying drawings...) Figure 1 The features of the embodiments disclosed herein and how to implement the features of the embodiments disclosed herein will become apparent from the embodiments described in more detail herein.

[0024] Unless the context explicitly specifies otherwise, references to elements (e.g., “the”) may include plural forms. For purposes of meaning and interpretation, the term “and / or” is intended to include any combination of the terms “and” and “or”. For example, “A and / or B” can be understood to mean “A, B, or A and B”. The terms “and” and “or” can be used in a connected or separate sense and can be understood as equivalent to “and / or”. For purposes of meaning and interpretation, the phrase “at least one of…” is intended to include the meaning of “at least one of the groups…”. For example, “at least one of A and B” can be understood to mean “A, B, or A and B”.

[0025] It will be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the publicly disclosed teachings, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element. For ease of description, spatially relative terms such as “below,” “under,” “down,” “above,” and “above” may be used herein to describe the relationship of one element or feature as shown in the accompanying drawings to another element(s). It will be understood that, in addition to the orientations depicted in the accompanying drawings, spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, then an element described as “below” or “under” other elements or features will be subsequently oriented as “above” or “above” other elements or features. Thus, the term “below” can encompass both above and below orientations. The device may be oriented in other ways, and the spatially relative descriptive terms used herein should be interpreted accordingly.

[0026] The terminology used herein is for the purpose of describing embodiments of the present invention and is not intended to limit the disclosure. As used herein, the singular form “a” is intended to include the plural form as well, unless the context explicitly indicates otherwise. It will be further understood that, when used in this specification, the terms “comprising,” “including,” “containing,” and / or “having” indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Each of the features of the various disclosed embodiments can be combined in whole or in part, and various technically interconnected and driving relationships are possible. Each embodiment can be implemented independently of each other or can be implemented together in association. For ease of explanation, the dimensions of the components in the drawings may be exaggerated. In other words, since the dimensions and thicknesses of the components in the drawings can be arbitrarily shown for ease of explanation, the following embodiments disclosed herein are not limited thereto.

[0027] Unless otherwise specified, all terms used in this invention (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms defined in commonly used dictionaries shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and unless expressly defined herein, these terms shall not be interpreted in an idealized or overly formal sense.

[0028] This utility model provides a compression-type packer with multiple unsealing methods, such as... Figure 1As shown, it includes an upper connector 1, an upper balance ring 2, a sealing ring I 3, a pressure cap 4, a balance piston 5, a sealing ring II 6, an upper rubber sleeve seat 7, a central tube 8, an outer central tube 9, a rubber sleeve 10, a lower rubber sleeve seat 11, a main seat sealing piston 12, an upper piston sleeve 13, a lower central tube 14, a secondary seat sealing piston 15, a lower piston sleeve 16, a release piston 17, a sealing ring III 18, a locking ring 19, a support ring 20, a release pin 21, a locking sleeve 22, a shear pin sleeve 23, a seat sealing pin 24, a retaining ring 25, and a lower connector 26.

[0029] Among them, the retaining ring 25 is threadedly connected to one end of the lower connector 26;

[0030] The shear pin sleeve 23 is fixedly sleeved on the retaining ring 25 by the setting pin 24;

[0031] The locking sleeve 22 and the support ring 20 are fixedly sleeved on the lower connector 26 by the unlocking pin 21;

[0032] The central tube 8, the lower central tube 14, and the lower connector 26 are threaded together to form the central channel of the packer;

[0033] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel of the lower connector 26, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0034] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel of the lower central tube 14, and the other end that contacts the upper piston sleeve 13 and is sleeved on the lower central tube 14.

[0035] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel of the central tube 8, and the other end is in contact with the lower rubber sleeve seat 11 and is sleeved on the central tube 8.

[0036] The upper piston sleeve 13 is threadedly connected to the lower rubber sleeve seat 11;

[0037] The balance piston 5 is sleeved on the outer central tube 9, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, and the other end is connected to the pressure cap 4 and sleeved on the outer central tube 9.

[0038] The upper connector 1 is threadedly connected to the upper end of the central tube 8;

[0039] The outer central tube 9 is set outside the central tube 8, and the rubber sleeve 10 is set outside the outer central tube 9;

[0040] The upper glue tube seat 7 and the lower glue tube seat 11 are used to fix the glue tube 10;

[0041] The upper piston sleeve 13 is threadedly connected to the upper connector 1.

[0042] Optionally, during operation, after the packer is lowered into the well to the designed position, the casing is filled with fluid to the wellhead, and then the internal pressure is immediately increased to 12-13 MPa (the seat pin breaks at 9-10 MPa). Pressure is then introduced through the pressure guide hole of the central tube to push the main seat piston, and pressure is introduced through the pressure guide hole of the lower central tube to push the auxiliary seat piston, which cuts the seat pin. The retaining ring pushes the shear pin sleeve, the lower piston sleeve, and the upper piston sleeve to form a double-cylinder seat, which sets the rubber sleeve. The lower rubber sleeve seat is pushed to compress the rubber sleeve sealing oil sleeve annulus, and the locking sleeve and locking ring lock the internal pressure relief, and the rubber sleeve is not retracted.

[0043] Optionally, when unsealing, the tubing string is lifted, the unsealing pin is disconnected, the support ring of the locking sleeve and the locking ring is separated, the rubber sleeve shrinks back to its original state, and the packer is removed.

[0044] Optionally, when unsealing, internal pressure is applied to the oil pipe. When the pressure is around 20MPa, the unsealing piston is pushed through the pressure guide hole of the lower connector to shear the unsealing pin. The support ring of the locking sleeve and the locking ring disengages, and the rubber sleeve shrinks back to its original state, thus unsealing and removing the packer.

[0045] Optionally, if the pressure at the top of the packer is high, the pressure difference in the annular space compresses the upper rubber sleeve seat through the annular pressure guide hole of the balance piston, making the rubber sleeve and the sleeve more tightly contacted and playing a role in balancing the upper and lower pressures.

[0046] Among them, the retaining ring 25 is threaded to one end of the lower connector 26, the shear pin sleeve 23 is fixedly sleeved on the retaining ring 25 by the setting pin 24, and the locking sleeve 22 and the support ring 20 are fixedly sleeved on the lower connector 26 by the releasing pin 21. The center 8, the lower center tube 14 and the lower connector 26 are threadedly connected to form the packer center channel. The releasing piston 17 has a pressure guide hole at one end that communicates with the center channel of the lower connector 26, and a locking ring 19 at the other end, and is sleeved on the lower connector 26. The auxiliary sealing piston 15 has a pressure guide hole at one end that communicates with the center channel of the lower center tube 14, and the other end contacts the upper piston sleeve 13, and is sleeved on the lower center tube. On the 14th, the main seat piston 12 has a pressure guide hole at one end that communicates with the central channel of the central tube 8, and the other end that contacts the lower rubber sleeve seat 11. It is sleeved on the central tube 8. The upper piston sleeve 13 is threadedly connected to the lower rubber sleeve seat 11. The balance piston 5 has a pressure guide hole at one end that communicates with the annular space and contacts the upper rubber sleeve seat 7. The other end is connected to the pressure cap 4 and sleeved on the outer central tube 9. The upper connector 1 is threadedly connected to the upper end of the central tube 8. The outer central tube 9 is sleeved on the outside of the central tube 8, and the rubber sleeve 10 is sleeved on the outside of the outer central tube 9. The upper rubber sleeve seat 7 and the lower rubber sleeve seat 11 are used to fix the rubber sleeve 10. The upper piston sleeve 13 is threadedly connected to the upper connector 1.

[0047] During operation, after the packer is lowered to the designed position, the casing is filled with fluid to the wellhead, and then the internal pressure is immediately increased to 12-13 MPa (the setting pin breaks at 9-10 MPa). [If it is not possible to fill the casing to the wellhead, accurately estimate the depth pressure of the casing fluid level to ensure that the oil-casing pressure difference is 12-13 MPa during setting.] Pressure is introduced through the pressure guide hole of the central tube 8 to push the main setting piston 12, and pressure is introduced through the pressure guide hole of the lower central tube 14 to push the auxiliary setting piston 15, which shears the setting pin 24. The retaining ring 25 pushes the shear pin sleeve 23, the lower piston sleeve 16, and the upper piston sleeve 13. The double-cylinder setting pushes the lower rubber sleeve seat 11 to compress the rubber sleeve 10 and seal the oil-casing annulus. The locking sleeve 22 and the locking ring 19 lock together, and the pressure relief rubber sleeve 10 inside the tube is not retracted.

[0048] Method 1 for unsealing: When unsealing, lift the oil pipe string, the unsealing pin 21 will break, the locking sleeve 22 will disengage from the support ring 20 of the locking ring 19, the rubber sleeve 10 will retract and return to its original state, and the packer will be removed.

[0049] Method 2 for unsealing: When unsealing, apply internal pressure to the oil pipe. When the pressure is about 20MPa, push the unsealing piston 17 through the pressure guide hole of the lower connector 26 to cut off the unsealing pin 21. The locking sleeve 22 will disengage from the support ring 20 of the locking ring 19, and the rubber sleeve 10 will shrink and return to its original state. The packer can then be unsealed and removed.

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

[0051] Example 1

[0052] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0053] Example 2

[0054] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0055] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0056] Example 3

[0057] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0058] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0059] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0060] Example 4

[0061] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0062] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0063] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0064] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0065] Example 5

[0066] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0067] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0068] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0069] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0070] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0071] Example 6

[0072] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0073] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0074] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0075] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0076] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0077] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0078] Example 7

[0079] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0080] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0081] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0082] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0083] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0084] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0085] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0086] Example 8

[0087] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0088] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0089] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0090] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0091] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0092] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0093] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0094] The upper connector 1 is fitted with an upper balance ring 2.

[0095] Example 9

[0096] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0097] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0098] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0099] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0100] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0101] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0102] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0103] The upper connector 1 is fitted with an upper balance ring 2.

[0104] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0105] Example 10

[0106] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0107] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0108] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0109] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0110] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0111] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0112] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0113] The upper connector 1 is fitted with an upper balance ring 2.

[0114] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0115] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0116] Example 11

[0117] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0118] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0119] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0120] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0121] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0122] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0123] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0124] The upper connector 1 is fitted with an upper balance ring 2.

[0125] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0126] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0127] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0128] Example 12

[0129] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0130] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0131] Example 13

[0132] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0133] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0134] Example 14

[0135] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0136] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0137] Example 15

[0138] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0139] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0140] Example 16

[0141] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0142] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0143] Example 17

[0144] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0145] The upper connector 1 is fitted with an upper balance ring 2.

[0146] Example 18

[0147] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0148] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0149] Example 19

[0150] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0151] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0152] Example 20

[0153] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0154] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0155] Example 21

[0156] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0157] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0158] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0159] Example 22

[0160] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0161] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0162] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0163] Example 23

[0164] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0165] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0166] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0167] Example 24

[0168] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0169] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0170] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0171] Example 25

[0172] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0173] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0174] The upper connector 1 is fitted with an upper balance ring 2.

[0175] Example 26

[0176] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0177] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0178] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0179] Example 27

[0180] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0181] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0182] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0183] Example 28

[0184] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0185] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0186] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0187] Example 29

[0188] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0189] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0190] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0191] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0192] Example 30

[0193] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0194] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0195] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0196] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0197] Example 31

[0198] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0199] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0200] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0201] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0202] Example 32

[0203] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0204] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0205] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0206] The upper connector 1 is fitted with an upper balance ring 2.

[0207] Example 33

[0208] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0209] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0210] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0211] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0212] Example 34

[0213] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0214] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0215] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0216] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0217] Example 35

[0218] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0219] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0220] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0221] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0222] Example 36

[0223] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0224] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0225] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0226] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0227] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0228] The upper connector 1 is fitted with an upper balance ring 2.

[0229] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0230] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0231] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0232] Example 37

[0233] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0234] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0235] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0236] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0237] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0238] The upper connector 1 is fitted with an upper balance ring 2.

[0239] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0240] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0241] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0242] Example 38

[0243] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0244] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0245] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0246] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0247] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0248] The upper connector 1 is fitted with an upper balance ring 2.

[0249] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0250] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0251] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0252] Example 39

[0253] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0254] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0255] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0256] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0257] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0258] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0259] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0260] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0261] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0262] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0263] Example 40

[0264] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0265] One end of the main seat piston 12 has a pressure guide hole that communicates with the central channel, and the other end is in contact with the lower rubber sleeve seat 11. The upper piston sleeve 13 is fitted over the main seat piston 12 and is threadedly connected to the lower rubber sleeve seat 11.

[0266] The auxiliary seat piston 15 has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve 13.

[0267] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0268] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0269] The upper connector 1 is fitted with an upper balance ring 2.

[0270] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0271] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0272] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

[0273] Example 41

[0274] A compression-type packer with multiple release methods includes, from top to bottom, an upper connector 1, a central tube 8, a lower central tube 14, and a lower connector 26, which are threaded together to form the central channel of the packer. An outer central tube 9 is fitted in the middle of the central tube 8. A balance piston 5 and a rubber sleeve 10 are fitted in sequence from top to bottom outside the outer central tube 9. An upper rubber sleeve seat 7 and a lower rubber sleeve seat 11 for fixing are respectively provided at both ends of the rubber sleeve 10. A main seat piston 12 and an upper piston sleeve 13 are fitted in sequence from top to bottom at the lower part of the central tube 8. A secondary seat piston 15, a lower piston sleeve 16, and a release piston 17 are fitted in sequence from top to bottom outside the lower central tube 14.

[0275] The balance piston 5 is sleeved on the outer central tube, forming an annular space between the two. One end of the balance piston 5 has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat 7, while the other end is connected to the pressure cap 4.

[0276] The unsealing piston 17 has a pressure guide hole at one end that communicates with the central channel, and a locking ring 19 at the other end, which is fitted onto the lower connector 26.

[0277] The upper end of the lower connector 26 is connected to a retaining ring 25 by a thread, and a shearing pin sleeve 23 is fixedly sleeved on the retaining ring 25 by a setting pin 24.

[0278] The lower connector 26 is fixedly fitted with a locking sleeve 22 and a support ring 20 by means of a release pin 21.

[0279] The upper connector 1 is fitted with an upper balance ring 2.

[0280] A sealing ring I3 is provided at the connection between the upper connector 1 and the central tube 8.

[0281] A sealing ring II 6 is provided at the junction of the balance piston 5 and the upper rubber sleeve seat 7.

[0282] A sealing ring Ⅲ18 is provided at the connection position between the unlocking piston 17 and the locking ring 19.

Claims

1. A compression-type packer with multiple unsealing methods, characterized in that, The packer consists of an upper connector (1), a central tube (8), a lower central tube (14), and a lower connector (26) connected in a threaded manner from top to bottom. An outer central tube (9) is fitted in the middle of the central tube (8). A balance piston (5) and a rubber sleeve (10) are fitted in a threaded manner from top to bottom outside the outer central tube (9). An upper rubber sleeve seat (7) and a lower rubber sleeve seat (11) are respectively provided at both ends of the rubber sleeve (10) for fixing. A main seat piston (12) and an upper piston sleeve (13) are fitted in a threaded manner from top to bottom at the lower part of the central tube (8). A secondary seat piston (15), a lower piston sleeve (16), and a release piston (17) are fitted in a threaded manner from top to bottom outside the lower central tube (14).

2. The compression-type packer with multiple unsealing methods according to claim 1, characterized in that, The main seat piston (12) has a pressure guide hole at one end that communicates with the central channel and the other end that contacts the lower rubber sleeve seat (11). The upper piston sleeve (13) is fitted over the main seat piston (12) and is threadedly connected to the lower rubber sleeve seat (11).

3. The compression-type packer with multiple unsealing methods according to claim 2, characterized in that, The balance piston (5) is sleeved on the outer central tube (9), forming an annular space between the two. One end of the balance piston (5) has a pressure guide hole that communicates with the annular space and contacts the upper rubber sleeve seat (7), and the other end is connected to the pressure cap (4).

4. The compression-type packer with multiple unsealing methods according to claim 3, characterized in that, The auxiliary seat piston (15) has a pressure guide hole at one end that communicates with the central channel, and the other end is in contact with the upper piston sleeve (13).

5. The compression-type packer with multiple unsealing methods according to claim 4, characterized in that, The unsealing piston (17) has a pressure guide hole at one end that communicates with the central channel and a locking ring (19) at the other end. The locking ring (19) is sleeved on the lower connector (26).

6. The compression-type packer with multiple unsealing methods according to claim 5, characterized in that, The upper end of the lower connector (26) is connected to a retaining ring (25) by a thread, and a shearing pin sleeve (23) is fixedly sleeved on the retaining ring (25) by a seating pin (24).

7. The compression-type packer with multiple unsealing methods according to claim 6, characterized in that, The lower connector (26) is fixedly fitted with a locking sleeve (22) and a support ring (20) by means of a release pin (21).

8. The compression-type packer with multiple unsealing methods according to claim 7, characterized in that, The upper connector (1) is fitted with an upper balance ring (2).

9. The compression-type packer with multiple unsealing methods according to claim 8, characterized in that, A sealing ring I (3) is provided at the connection between the upper connector (1) and the central tube (8).

10. The compression-type packer with multiple unsealing methods according to claim 1, characterized in that, A sealing ring II (6) is provided at the junction of the balance piston (5) and the upper rubber sleeve seat (7).

11. The compression-type packer with multiple unsealing methods according to claim 1, characterized in that, A sealing ring Ⅲ (18) is provided at the connection position between the unsealing piston (17) and the locking ring (19).

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