A quick-release packer

Abstract

The utility model relates to packer technical field, and disclose a quick detachable packer, including tensioning mechanism, support mechanism and at least one sealing mechanism, wherein: the sealing mechanism includes air bag, connecting ring and two end covers, two the end cover is respectively sleeved in the both ends of air bag, the end cover is away from the one end of air bag and is provided with the slot, the end of connecting ring and the inner wall sliding connection of slot for the splicing between end cover. Two the end cover all are through the sliding connection of the through -hole that seted up on tensioning mechanism, the one end of tensioning mechanism and one end cover abut, the air bag is sleeved in the outside of tensioning mechanism. The quick detachable packer can effectively avoid the air bag local excessive deformation caused by one -sided stress deviation, sealing failure or the problem of not tight caused by insufficient deformation, and modularization splicing structure, can according to the size of borehole, sealing section length and so on working condition demand in actual construction, quickly complete the combination splicing and fixed of multiple rubber cylinder air bag.

Description

Technical Field

[0001] This utility model relates to the field of packer technology, specifically to a quick-release packer. Background Technology

[0002] Packers are key downhole tools in oil and gas extraction and geological exploration engineering. They are mainly used to achieve isolation and sealing between the tubing and the wellbore or between different formations within the wellbore. Their performance directly affects the safety and efficiency of downhole operations. During the development of oil and gas fields, packers need to withstand complex working conditions such as high temperature, high pressure, fluid scouring and tubing vibration for a long time. Therefore, stringent requirements are placed on sealing reliability, scenario adaptability and structural stability.

[0003] Existing quick-release packers generally adopt a single-end fixed or asymmetrical pressure structure design. Such designs are prone to uneven stress on the rubber sleeve. During the sealing process, the two ends of the rubber sleeve will undergo excessive deformation due to local pressure concentration, while the middle section may have a problem of loose sealing due to insufficient pressure. In terms of scenario adaptability, existing quick-release packers are mostly integrated structures with fixed size specifications. The length of the sealing section needs to be flexibly adjusted, which not only requires a large number of spare parts of different specifications to be stocked, increasing inventory costs, but also makes it difficult to meet the sealing requirements under complex well conditions. Utility Model Content

[0004] This utility model provides a quick-release packer that can effectively avoid the problems of excessive local deformation of the airbag, sealing failure, or insufficient deformation caused by unilateral force deviation. In addition, the modular splicing structure can quickly complete the combination and fixing of multiple rubber-tube airbags according to the actual working conditions such as wellbore size and sealing section length.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Design a quick-release packer, comprising a tensioning mechanism, a support mechanism, and at least one sealing mechanism, wherein:

[0007] The sealing mechanism includes an airbag, a connecting ring, and two end caps. The two end caps are respectively fitted onto both ends of the airbag. The end of each end cap away from the airbag has a slot. The end of the connecting ring is slidably connected to the inner wall of the slot for splicing the end caps together.

[0008] Both end caps are slidably connected to the tensioning mechanism through through holes, one end of the tensioning mechanism abuts against one of the end caps, and the airbag is sleeved on the outside of the tensioning mechanism;

[0009] The support mechanism is slidably connected to the tensioning mechanism through the through hole, and one end abuts against the other end cap.

[0010] Optionally, the tensioning mechanism includes a pull rod and a limiting block, the limiting block being fixedly installed at one end of the pull rod, and the end caps being slidably connected to the outer surface of the pull rod through through holes.

[0011] Optionally, the tensioning mechanism further includes a compression spring, which is sleeved on the outer surface of the pull rod and located between the limiting block and the end cap, with one end of the compression spring abutting against the limiting block.

[0012] Optionally, the tensioning mechanism further includes multiple limiting grooves, all of which are formed on the outer surface of the pull rod and are distributed sequentially along the extension direction of the pull rod.

[0013] Optionally, a support mechanism is also included, which includes a sleeve and a fastening bolt. The inner wall of the sleeve is slidably connected to the outer surface of the pull rod. The fastening bolt is threaded through the end of the outer surface of the sleeve, and one end of the fastening bolt inserted into the sleeve is engaged with the inner wall of the limiting groove.

[0014] Optionally, one end of the sleeve is threadedly connected to a first limiting seat, the bottom end of the first limiting seat being detachably connected to the top end of one of the end caps.

[0015] Optionally, a second limiting seat is sleeved on one end of the pull rod that protrudes from the airbag. The top of the second limiting seat is detachably connected to the bottom end of the other end cap, and the bottom of the second limiting seat contacts the top of the compression spring.

[0016] Optionally, the outer surface of the end cap is threaded with a plurality of fixing bolts, one end of which is inserted into the inner wall of the slot. The outer surfaces of the connecting ring, the first limiting seat and the second limiting seat are all provided with fixing holes that are compatible with the fixing bolts.

[0017] This utility model provides a quick-release packer, which has the following advantages:

[0018] This quick-release packer allows both end caps to slide on the outer surface of the tensioning mechanism. When one end cap is compressed, it can move relative to the two ends of the airbag towards the center, achieving symmetrical and uniform pressure on both ends of the airbag. This effectively avoids problems such as excessive local deformation of the airbag, sealing failure, or insufficient deformation caused by unilateral force deviation, resulting in loose sealing. It significantly improves the working reliability of the sealing mechanism and the fatigue life of the airbag. Furthermore, relying on the detachable insertion and connection of the slots and connecting rings at the end caps, a modular splicing structure is constructed. Multiple rubber tubes (i.e., sealing mechanisms, or airbags) can be quickly combined, spliced, and fixed according to the actual construction requirements such as wellbore size and sealing section length. At the same time, they can be quickly disassembled and replaced, improving convenience. Through the splicable sealing mechanism, the size limitation of a single rubber tube (i.e., sealing mechanism, or airbag) is broken, greatly expanding the adaptability of the device and enhancing the flexibility and practicality of field applications. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall installation structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the tensioning mechanism of this utility model;

[0021] Figure 3 This is a schematic diagram of the sealing mechanism of this utility model;

[0022] Figure 4 This is a schematic diagram of the support mechanism structure of this utility model;

[0023] Figure 5 This is an exploded structural diagram of the sealing mechanism of this utility model.

[0024] In the diagram: 1. Tensioning mechanism; 101. Pull rod; 102. Limiting groove; 103. Limiting block; 104. Compression spring; 2. Supporting mechanism; 201. Sleeve; 202. Fastening bolt; 3. First limiting seat; 4. Second limiting seat; 5. Sealing mechanism; 501. Airbag; 502. End cap; 503. Slot; 504. Connecting ring; 6. Fixing bolt. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] Please see Figures 1 to 5This utility model provides a packer that is used for isolation between the tubing and the wellbore or between different formations within the wellbore. In this embodiment, the structure of the packer is improved to give it the advantage of adjustable sealing length. Specifically, taking downhole sealing with a packer as an example, as a preferred solution in this embodiment, the packer is a quick-release packer, which can avoid displacement and local excessive stretching and compression, and the sealing length can be adjusted according to sealing requirements.

[0027] Please see Figures 1 to 5 This utility model provides a technical solution: a quick-release packer, which is used for isolation between the tubing and the wellbore or between different formations within the wellbore.

[0028] A quick-release packer includes a tensioning mechanism 1, a support mechanism 2, and at least one sealing mechanism 5, wherein:

[0029] The sealing mechanism 5 includes an airbag 501, a connecting ring 504, and two end caps 502. The two end caps 502 are respectively fitted onto both ends of the airbag 501. A slot 503 is provided at the end of the end cap 502 away from the airbag 501. The end of the connecting ring 504 is slidably connected to the inner wall of the slot 503 for splicing the end caps 502.

[0030] Both end caps 502 are slidably connected to the tensioning mechanism 1 through through holes. One end of the tensioning mechanism 1 abuts against one of the end caps 502, and the airbag 501 is fitted over the outside of the tensioning mechanism 1.

[0031] The support mechanism 2 is slidably connected to the tensioning mechanism 1 through the through hole, and one end abuts against the other end cap 502.

[0032] In this embodiment, the airbag 501 serves as the core sealing element. Through axial compression, it generates radial expansion deformation, tightly fitting the inner wall of the wellbore or the outer wall of the tubing string to achieve formation isolation or fluid sealing. Simultaneously, it provides a passage for the tie rod 101, bearing the preload transmitted by the tensioning mechanism 1. Relying on the symmetrical pressure of the double end caps 502, it avoids tearing or permanent damage caused by excessive local deformation, while ensuring uniform contact with the sealing surface. It maintains stable sealing performance even in high-pressure, high-viscosity fluid environments, effectively reducing the risk of leakage. The end caps 502 are fixed to both ends of the airbag 501 using a sleeve connection. On one hand, they bear the force transmitted by the tensioning mechanism 1 or the support mechanism 2, and evenly distribute the force to both axial ends of the airbag 501. On the other hand, the rigid structure provides support to the ends of the airbag 501, preventing fluid media from intruding into the connection gap between the airbag 501 and the end caps 502, solving the problem of uneven force distribution on the airbag 501 caused by traditional single-end pressure application, and reducing damage to the rubber sleeve caused by local pressure concentration. Simultaneously, it buffers downhole pressure. Vibration and pressure fluctuations impact the airbag 501, extending its fatigue life and improving the long-term reliability of the sealing mechanism 5. The slot 503 is located at the end of the end cap 502 away from the airbag 501, providing an insertion and positioning channel for the connecting ring 504. This allows the connecting ring 504 and the end cap 502 to form a detachable assembly relationship, enabling the rapid docking of multiple rubber sleeve units without welding or complex tools. This provides a structural basis for modular splicing, breaking the size limitations of traditional integrated rubber sleeves. The two ends of the connecting ring 504 are respectively inserted into the slots 503 of adjacent end caps 502, connecting multiple sealing mechanisms 5 in series to form a longer sealing section. At the same time, the fixing holes on the outer surface, together with the fixing bolts 6, secure the sealing length to the end cap 502, allowing for flexible adjustment of the sealing length. Multiple rubber sleeve units can be combined according to the wellbore diameter and sealing section requirements to adapt to different well conditions. The splicing structure is detachable, and when a single airbag 501 is damaged, only the faulty unit needs to be replaced, reducing maintenance costs.

[0033] The tensioning mechanism 1 includes a pull rod 101 and a limiting block 103. The limiting block 103 is fixedly installed at one end of the pull rod 101, and the end caps 502 are slidably connected to the outer surface of the pull rod 101 through the through holes.

[0034] The tensioning mechanism also includes a compression spring 104, which is sleeved on the outer surface of the pull rod 101 and located between the limiting block 103 and the end cap 502. One end of the compression spring 104 abuts against the limiting block 103.

[0035] The tensioning mechanism 1 also includes multiple limiting grooves 102, which are all formed on the outer surface of the pull rod 101 and are distributed sequentially along the extension direction of the pull rod 101.

[0036] In this embodiment, the pull rod 101 passes through the inner wall of the airbag 501 and is slidable. One end is connected to the limiting block 103, and the other end transmits the tension force through the cooperation of the support mechanism 2. As a force transmission carrier, it evenly transmits the preload force of the compression spring 104 to the end cap 502, driving the airbag 501 to undergo axial compression deformation. The sliding fit and the limiting groove 102 design combine to achieve precise control of the preload force, adapting to different sealing pressure requirements. The limiting groove 102 is evenly opened on the outer wall of the pull rod 101 and engages with the end of the fastening bolt 202, restricting the pull rod 101 within the sleeve. The sliding position within 201 maintains the pre-tightened state of the fixed tensioning mechanism 1. Through the multi-position limiting groove 102 design, the extension length of the pull rod 101 can be adjusted according to sealing requirements, thereby controlling the compression and expansion degree of the airbag 501. This achieves graded adjustment of the sealing pressure, improving adaptability to different formation pressures. The limiting block 103 is fixedly installed at the end of the pull rod 101 that extends out of the airbag 501, forming an axial limit on the compression spring 104, preventing the compression spring 104 from falling off the end of the pull rod 101 due to the thrust of the sealing mechanism 5; simultaneously, it supports the compression spring 104. The elastic force of the support mechanism 2 is transmitted in the opposite direction to the sealing mechanism 5. The limiting block 103 ensures the assembly stability of the compression spring 104 and prevents the compression spring 104 from shifting and failing due to downhole vibration. During use, the sealing mechanism 5 is pushed by the support mechanism 2 and moves along the extension direction of the pull rod 101, compressing the compression spring 104. At this time, the compression spring 104 is relatively compressed. At the same time, the elastic force of the compression spring 104 also acts on the sealing mechanism 5. Through the thrust of the support mechanism 2 and the elastic force of the compression spring 104, the airbag 501 is compressed. The airbag 501 expands and deforms to seal. When the airbag 501 is used for a long time, it will shrink back. The limiting block 103 limits the compression spring 104 to always be in a compressed state, that is, it will continuously output elastic force to maintain the sealing deformation of the airbag 501, that is, to keep the airbag 501 in its initial expanded state. To achieve this purpose, when the compression spring 104 is relatively compressed, the airbag 501 reaches the initial expanded state and can no longer expand. At this time, the elastic force of the compression spring 104 is overcome, the airbag 501 no longer deforms, and the compression spring 104 is relatively compressed.

[0037] Alternatively, it can be understood that the compression spring 104 is sleeved on the outer wall of the pull rod 101 and located between the limiting block 103 and the second limiting seat 4. It generates elastic preload through its own compression deformation, which pushes the pull rod 101 to drive the end cap 502 to squeeze the airbag 501. Utilizing the elastic compensation characteristics, when the downhole temperature changes cause the airbag 501 to expand and contract due to heat, or when the fluid pressure fluctuations affect the sealing interface, the preload is automatically adjusted to ensure that the contact pressure between the airbag 501 and the well wall is always in the optimal range, avoiding sealing failure caused by insufficient preload or overload.

[0038] In the above embodiments, as a preferred option, a support mechanism 2 is further included. The support mechanism 2 includes a sleeve 201 and a fastening bolt 202. The inner wall of the sleeve 201 is slidably connected to the outer surface of the pull rod 101. The fastening bolt 202 is threaded through the end of the outer surface of the sleeve 201. One end of the fastening bolt 202 that penetrates the sleeve 201 is engaged with the inner wall of the limiting groove 102. The limiting groove 102 on the outer wall of the pull rod 101 provides a locking point for the fastening bolt 202, thereby locking the position of the pull rod 101. The sleeve 201 can provide radial support for the pull rod 101, preventing the pull rod 101 from bending under high pressure. Deformation ensures the accuracy of force transmission; at the same time, it isolates the tie rod 101 from direct contact with downhole fluids and impurities, reducing wear and corrosion of the tie rod 101 and improving the structural stability of the tensioning mechanism 1. The fastening bolt 202 is threaded through the end of the sleeve 201, and one end of the bolt 202 is engaged with the limiting groove 102 of the tie rod 101. By tightening the bolt, the position of the tie rod 101 is locked, fixing the pre-tightened state of the tensioning mechanism 1, realizing the quick locking and unlocking of the tie rod 101 position, which is convenient for adjusting the sealing pre-tightening force during on-site construction. The threaded connection structure is reliable and can withstand downhole vibration and pressure fluctuations, avoiding sealing loosening caused by locking failure.

[0039] In the above embodiments, as a preferred solution, one end of the sleeve 201 is threadedly connected to a first limiting seat 3. The bottom end of the first limiting seat 3 is detachably connected to the top end of one of the end caps 502. The first limiting seat 3 is threadedly connected to the sleeve 201 at one end, and detachably connected to one of the end caps 502 at the other end through a fixing bolt 6, thereby realizing the connection between the support mechanism 2 and the sealing mechanism 5. The threaded connection facilitates the disassembly and maintenance of the sleeve 201 and the limiting seat. At the same time, the detachable design allows the support mechanism 2 and the sealing mechanism 5 to be replaced separately, reducing spare parts costs. The connection structure allows the force to be smoothly transmitted from the sleeve 201 to the end cap 502, enhancing the overall force coordination.

[0040] One end of the sleeve 201 is connected to the end cap 502 via the first limiting seat 3, and the other end provides an installation carrier for the fastening bolt 202. The sleeve 201 can also push the first limiting seat 3 and the sealing mechanism 5 connected via the first limiting seat 3 to slide along the extension direction of the pull rod 101. By pushing the airbag 501, the connecting ring 504 and the two end caps 502 to slide along the extension direction of the pull rod 101, the compression spring 104 simultaneously applies force to the end caps 502. The force is transmitted to the airbag 501 through the two end caps 502, thereby compressing the airbag 501 from both ends to the middle. The airbag 501 is compressed and expands in the middle, filling the gap between the tubing and the wellbore or between different formations in the wellbore to achieve a plugging seal.

[0041] In the above embodiment, as a preferred solution, a second limiting seat 4 is sleeved on one end of the pull rod 101 that protrudes from the airbag 501. The top of the second limiting seat 4 is detachably connected to the bottom of another end cap 502, and the bottom of the second limiting seat 4 contacts the top of the compression spring 104. The second limiting seat 4 is sleeved on one end of the pull rod 101 that protrudes from the airbag 501. The top is connected to the other end cap 502 by a fixing bolt 6, and the bottom contacts the compression spring 104, bearing the preload of the spring and transmitting it to the end cap 502, thereby realizing the flexible connection between the tensioning mechanism 1 and the sealing mechanism 5 and buffering the impact of the spring force on the end cap 502. At the same time, through the supporting effect of the limiting seat, it is ensured that the spring does not shift during compression and the preload is stably transmitted.

[0042] In the above embodiment, as a preferred solution, multiple fixing bolts 6 are threaded through the outer surface of the end cap 502. One end of the fixing bolt 6 penetrates the inner wall of the slot 503. The outer surfaces of the connecting ring 504, the first limiting seat 3, and the second limiting seat 4 are all provided with fixing holes that are compatible with the fixing bolts 6. The fixing bolts 6 are threaded through the outer surface of the end cap 502, and one end of the fixing bolt 6 penetrates the end cap 502 and respectively engages with the fixing holes of the connecting ring 504, the first limiting seat 3, and the second limiting seat 4 to securely connect each component to the end cap 502. This strengthens the connection reliability between the end cap 502 and the splicing components and connecting components, prevents loosening of the connection caused by downhole vibration and fluid scouring, and ensures that the multiple bolts are evenly distributed to further ensure uniform stress and avoid overall structural failure caused by local connection failure.

[0043] In this invention, the working steps of the device are as follows:

[0044] 1. First, fit the two ends of a single airbag 501 into the two end caps 502 respectively, ensuring that the end caps 502 and the airbag 501 fit tightly to form a basic sealing unit. If it is necessary to extend the sealing section, insert one end of the connecting ring 504 into the slot 503 of the end cap 502 that has been assembled, and connect the other end to the slot 503 of the end cap 502 of another sealing unit to complete the series connection of multiple sealing mechanisms 5. Insert the fixing bolts 6 on the outer surface of the end cap 502 into the fixing holes of the connecting ring 504 and tighten the bolts to achieve splicing and fastening.

[0045] 2. Next, insert the device into the hole that needs to be sealed, and then unscrew the fastening bolt 202. Then, pull the lever 101 to make the first limiting seat 3 and the second limiting seat 4 squeeze the two end caps 502, thereby causing the airbag 501 to expand and deform, thus achieving the sealing effect. After the airbag 501 expands to the appropriate degree, tighten the fastening bolt 202 so that the fastening bolt 202 is inserted into the limiting groove 102 to complete the locking.

[0046] 3. Then, after the operation is completed, first loosen the fastening bolt 202 on the sleeve 201 to release the position lock of the tie rod 101, push the tie rod 101 in the opposite direction, the airbag 501 resets, the airbag 501 contracts radially, and disengages from the well wall, thus completing the unsealing.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-release packer, characterized in that: It includes a tensioning mechanism (1), a support mechanism (2), and at least one sealing mechanism (5), wherein: The sealing mechanism (5) includes an airbag (501), a connecting ring (504), and two end caps (502). The two end caps (502) are respectively sleeved on both ends of the airbag (501). A slot (503) is provided at the end of the end cap (502) away from the airbag (501). The end of the connecting ring (504) is slidably connected to the inner wall of the slot (503) for splicing the end caps (502). Both end caps (502) are slidably connected to the tensioning mechanism (1) through the through holes. One end of the tensioning mechanism (1) abuts against one of the end caps (502), and the airbag (501) is sleeved on the outside of the tensioning mechanism (1). The support mechanism (2) is slidably connected to the tensioning mechanism (1) through the through hole, and one end abuts against the other end cap (502).

2. The quick-release packer according to claim 1, characterized in that: The tensioning mechanism (1) includes a pull rod (101) and a limiting block (103). The limiting block (103) is fixedly installed at one end of the pull rod (101), and the end caps (502) are slidably connected to the outer surface of the pull rod (101) through the through holes.

3. A quick-release packer according to claim 2, characterized in that: The tensioning mechanism also includes a compression spring (104), which is sleeved on the outer surface of the pull rod (101) and located between the limiting block (103) and the end cap (502). One end of the compression spring (104) abuts against the limiting block (103).

4. A quick-release packer according to claim 2, characterized in that: The tensioning mechanism (1) also includes a plurality of limiting grooves (102), which are all opened on the outer surface of the pull rod (101) and are distributed sequentially along the extension direction of the pull rod (101).

5. A quick-release packer according to claim 4, characterized in that: It also includes a support mechanism (2), which includes a sleeve (201) and a fastening bolt (202). The inner wall of the sleeve (201) is slidably connected to the outer surface of the pull rod (101). The fastening bolt (202) is threaded through the end of the outer surface of the sleeve (201). One end of the fastening bolt (202) that passes through the sleeve (201) is engaged with the inner wall of the limiting groove (102).

6. A quick-release packer according to claim 5, characterized in that: One end of the sleeve (201) is threadedly connected to a first limiting seat (3), and the bottom end of the first limiting seat (3) is detachably connected to the top end of one of the end caps (502).

7. A quick-release packer according to claim 4, characterized in that: The pull rod (101) extends out of the airbag (501) and is fitted with a second limiting seat (4). The top of the second limiting seat (4) is detachably connected to the bottom of the other end cap (502). The bottom of the second limiting seat (4) is in contact with the top of the compression spring (104).

8. A quick-release packer according to claim 5, characterized in that: The outer surface of the end cap (502) is threaded with multiple fixing bolts (6). One end of the fixing bolt (6) is inserted into the inner wall of the slot (503). The outer surfaces of the connecting ring (504), the first limiting seat (3) and the second limiting seat (4) are all provided with fixing holes that are compatible with the fixing bolts (6).

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