A capillary-set packer

Abstract

This utility model discloses a capillary setting packer including a main spindle, an upper connector, an anchoring mechanism, and a setting mechanism. The upper connector is located at one end of the main spindle and is detachably connected to the main spindle. The anchoring mechanism is sleeved on the main spindle and is detachably connected to the upper connector. The anchoring mechanism body has a first capillary channel communicating with the external environment along the X-axis. The setting mechanism is sleeved on the main spindle, with one end detachably connected to the anchoring mechanism and the other end detachably connected to the main spindle. The setting mechanism body has a second capillary channel along the X-axis. The first and second capillary channels communicate with the piston chamber to form a high-pressure fluid passage. The high-pressure fluid is output from the surface pump to precisely drive the piston action, achieving fast and reliable setting without relying on ball droppers or plugs. The controllable fluid output pressure makes setting more flexible. The pressure transmission is not affected by the properties of the well fluid, resulting in a high setting success rate and the ability to repeat setting.

Description

Technical Field

[0001] This utility model relates to the technical field of downhole packer tools for oil wells, specifically a capillary-set packer. Background Technology

[0002] In recent years, large-scale well drilling for air storage and oil extraction has led to the widespread application of well completion tools. Packers, as a commonly used downhole tool among well completion tools, are essential in almost every well. Packers play a crucial role in the entire well string and are fundamental to ensuring the proper functioning of downhole tools.

[0003] Currently used packers mostly employ traditional hydraulic or mechanical setting methods. Traditional hydraulic setting relies on ball seats or plugs to seal the tubing, leading to additional tool input and increased operation time. Furthermore, the setting process is susceptible to interference, causing failure, and it's difficult to re-pressurize and compact the packer if the initial setting is unsatisfactory. Mechanical setting, while not requiring fluid pressurization, necessitates specialized setting tools and is easily affected by wellbore friction, making precise control of the setting position and force difficult. Both methods are cumbersome, time-consuming, and have low success rates. If setting fails, the tubing string must be retrieved and re-processed, resulting in high construction costs and operational risks. Moreover, after long-term use, the packer is prone to aging and leakage, and the lack of effective secondary setting methods often necessitates complete replacement, leading to low efficiency and resource waste. Even if these packers are successfully set, unsealing and recovery remain challenging, requiring specialized unsealing tools to cut and unseal the packer mandrel for recovery. This process is time-consuming, labor-intensive, and may impact the downhole environment. In addition, conventional recyclable packers also have problems such as insufficient lower annulus bearing capacity, easy shearing of shear pins by downhole jacking force, leading to accidental unsealing of the packer and high safety risks; after setting and depressurization, the rubber sleeve has a tendency to rebound, resulting in poor sealing reliability and affecting long-term sealing effect. Utility Model Content

[0004] To address the aforementioned technical challenges, this application provides a capillary-set packer, comprising:

[0005] Main spindle;

[0006] The upper connector is located at one end of the main spindle and is detachably connected to the main spindle.

[0007] An anchoring mechanism is sleeved on the main spindle and is detachably connected to the upper connector. The anchoring mechanism body along the X-axis is provided with a first capillary channel that communicates with the external environment.

[0008] The setting mechanism is sleeved on the main spindle. One end of it is detachably connected to the anchoring mechanism, and the other end is detachably connected to the main spindle. The setting mechanism body is provided with a second capillary channel communicating with the first capillary channel along the X-axis.

[0009] Preferably, the anchoring mechanism includes a hydraulic anchor assembly, a button clip, and a leaf spring. The hydraulic anchor assembly is sleeved on the main spindle and detachably connected to the upper connector. A first capillary channel along the X-axis is provided on the hydraulic anchor assembly. The hydraulic anchor assembly also has mounting holes on its side wall. The button clip is located in the mounting holes with its toothed surface facing outwards. The leaf spring is located on the button clip and detachably connected to the hydraulic anchor assembly.

[0010] Preferably, there are at least six mounting holes, with two mounting holes forming a group. The line connecting the central axes of each group of mounting holes is parallel to the X-axis. The three groups of mounting holes are evenly distributed around the outer periphery of the hydraulic anchor assembly. Each mounting hole is equipped with a button clip, and each button clip is equipped with a leaf spring above it.

[0011] Preferably, the setting mechanism includes a pressure transmitting component, an anti-rebound component, a rubber sleeve component, and a slip component sequentially sleeved on the main spindle along the X-axis direction. One end of the pressure transmitting component is detachably connected to the anchoring mechanism, and the other end is detachably connected to the main spindle. The anti-rebound component is located between the pressure transmitting component and the rubber sleeve component. The pressure transmitting component and the rubber sleeve component are detachably connected. The rubber sleeve component and the slip component are detachably connected. The slip component and the main spindle are detachably connected.

[0012] Preferably, the pressure transmission assembly includes a piston mandrel, a piston, a piston cylinder, a first shear pin, and a pressure transmission tube. The piston mandrel is sleeved on the main mandrel and is detachably connected to the anchoring mechanism. The piston is sleeved on the piston mandrel, and the outer wall of the piston is detachably connected to the inner wall of the rubber sleeve assembly. An anti-rebound assembly is disposed in the sealed space formed by the piston, the piston mandrel, and the inner wall of the rubber sleeve assembly along the X-axis. The piston cylinder is sleeved on the piston and is detachably connected to the outer wall of the rubber sleeve assembly through the first shear pin. A second capillary channel is disposed on the piston cylinder body along the X-axis. The two ends of the pressure transmission tube are respectively inserted into the anchoring mechanism and the piston cylinder body, and the inner cavity of the pressure transmission tube is respectively connected to the first capillary channel and the second capillary channel.

[0013] Preferably, the anti-rebound assembly includes a spring and a C-shaped inner cone slip, both of which are arranged around the piston spindle. The spring is located between the pressure transmission assembly and the C-shaped inner cone slip along the X-axis direction, and both the spring and the C-shaped inner cone slip are located within the sealed space formed by the piston, the piston spindle, and the inner wall of the rubber sleeve assembly.

[0014] Preferably, the rubber sleeve assembly includes a rubber sleeve mandrel, a rubber sleeve support ring, and a rubber sleeve. The rubber sleeve support ring includes a first rubber sleeve support ring and a second rubber sleeve support ring. The rubber sleeve mandrel is sleeved on the piston mandrel. The rubber sleeve support ring is located at both ends of the rubber sleeve mandrel. The inner wall of the rubber sleeve support ring is detachably connected to the rubber sleeve mandrel. The rubber sleeve is sleeved on the rubber sleeve mandrel and located between the first rubber sleeve support ring and the second rubber sleeve support ring. The outer wall of the first rubber sleeve support ring is detachably connected to the piston cylinder through a first shear pin. The second rubber sleeve support ring is detachably connected to the slip assembly. The rubber sleeve includes a first section, a second section, and a third section sequentially along the X-axis.

[0015] Preferably, the slip assembly includes, in sequence along the X-axis, a slip mandrel, a slip, and a slip assembly. The slip mandrel is sleeved on the piston mandrel and is detachably connected to the second rubber sleeve support ring. The slip mandrel has evenly distributed and spaced inclined conical slopes, and dovetail grooves are provided on the inclined conical slopes. The slip assembly has a first slot. The slip is disposed on the inclined conical slope, with one end of the slip inserted into the dovetail groove and the other end inserted into the first slot. The slip mandrel and the slip assembly are movably connected by a connecting guide.

[0016] Preferably, the slip assembly is detachably connected to the piston spindle via a lug, and the piston spindle is detachably connected to the main spindle via a second shear pin.

[0017] Preferably, a second radial screw hole is provided on the slip mandrel, and a radial guide hole is provided on the slip assembly. One end of the connecting guide is screwed into the second screw hole, and the other end is inserted into the guide hole.

[0018] The beneficial effects are as follows: This application provides a capillary setting packer that uses a modular design of main spindle, upper connector, anchoring mechanism and setting mechanism. Combined with the first and second capillary channels, it forms a high-pressure fluid passage that communicates with the piston chamber. The high-pressure fluid is output from the ground pump equipment to precisely drive the piston action, thereby achieving fast and reliable setting. This design offers several advantages: 1. It eliminates the need for ball-dropping or plugging devices, significantly simplifying the setting process; 2. Real-time control of fluid output pressure via surface pumps adapts to dynamic well conditions, enhancing setting flexibility and controllability. High-pressure fluid exists only in the first and second capillary channels, ensuring pressure transmission is unaffected by well fluid properties and resulting in a high setting success rate; 3. The setting method is unaffected by other tools. Each packer has an independent high-pressure fluid path, supporting independent setting of each packer and preventing interference between packers; 4. It effectively solves the problem of secondary setting. In case of packer leakage or unsatisfactory setting, high-pressure fluid can be output via surface pumps to recompact the packer or continuously pressurize until complete setting, ensuring the reliability and stability of downhole operations. This technical solution not only improves the adaptability and setting success rate of packers but also significantly reduces operating costs and construction time, demonstrating promising engineering application prospects and playing a crucial role in promoting intelligent and efficient oilfield development. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of this application;

[0021] Figure 2 This is a cross-sectional view of this application;

[0022] Figure 3 This is a schematic diagram of the exploded structure of this application;

[0023] In the picture:

[0024] 1. Main spindle; 11. Stop surface; 12. Third keyway;

[0025] 2. Connect the upper connector;

[0026] 3. Anchoring mechanism; 31. Hydraulic anchor assembly; 311. First capillary channel; 312. Mounting hole; 32. Button clip; 33. Leaf spring; 34. Plug;

[0027] 4. Sealing mechanism;

[0028] 41. Pressure transmission assembly; 411. Piston mandrel; 4111. Limiting surface; 4112. Outer fine teeth; 4113. Lug; 4114. Spring pin; 412. Piston; 413. Piston cylinder; 4131. Second capillary channel; 414. First shear pin; 415. Pressure transmission tube;

[0029] 42. Anti-rebound assembly; 421. Spring; 422. C-type internal cone slip; 4221. Internal countersunk teeth;

[0030] 43. Glue tube assembly; 431. Glue tube mandrel; 432. First glue tube support ring; 433. First section of glue tube; 434. Second section of glue tube; 435. Third section of glue tube; 436. Second glue tube support ring;

[0031] 44. Kawasaki components;

[0032] 441. Slipper mandrel; 4411. Inclined tapered bevel; 4412. Connecting guide; 44121. Washer; 44122. Hexagonal nut;

[0033] 442. Kawa;

[0034] 443. Kawa assembly; 4431. Second shear pin; 4432. Second keyway. Detailed Implementation

[0035] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0036] It should be noted that all directional indicators in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0037] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. The detachable connection mentioned in this utility model can be any one or a combination of several of threaded connections, compression fittings, flange connections, and quick-connect fittings. These detachable connection methods are common mechanical designs and will not be elaborated further. All these alternative connection methods should fall within the protection scope of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0038] Example

[0039] Please see Figure 1 , Figure 1 This is a schematic diagram of the overall structure of this application. This embodiment provides a capillary-set packer, which includes, in sequence along the X-axis, a main spindle 1, an upper connector 2, an anchoring mechanism 3, and a setting mechanism 4.

[0040] See also Figure 1 Combined again Figure 2 , Figure 2 This is a cross-sectional view of this application. The upper connector 2 is located at one end of the main spindle 1 and is detachably connected to the main spindle 1. The connection is sealed by a seal. In this embodiment, the upper connector 2 and the main spindle 1 are detachably connected by a threaded connection, and the seal is specifically a sealing ring. Of course, the upper connector 2 and the main spindle 1 can also be detachably connected by a ferrule connection, flange connection, quick-connect connection, etc. These detachable connection methods are all common mechanical designs and will not be described in detail. These alternative connection methods should all fall within the protection scope of this application.

[0041] Anchoring mechanism 3 is sleeved on main spindle 1, and is detachably connected to upper connector 2. The connection is sealed by a seal. In this embodiment, anchoring mechanism 3 and main spindle 1 are detachably connected by threaded connection, and the seal is a sealing ring. Anchoring mechanism 3 is provided with a first capillary channel 311 communicating with the external environment along the X-axis. The first capillary channel 311 is also equipped with a plug 34, which is used to seal the end of the first capillary channel 311 to prevent foreign objects from falling into the first capillary channel 311 during transportation and causing blockage. During operation, the plug 34 can be removed, and then the ground pump equipment can be connected to the first capillary channel 311 by a capillary tube.

[0042] See also Figure 2 Combined again Figure 3 , Figure 3 This is a schematic diagram of the exploded structure of this application. Specifically, the anchoring mechanism 3 includes a hydraulic anchor assembly 31, a button clip 32, and a leaf spring 33. The hydraulic anchor assembly 31 is sleeved on the main spindle 1 and is detachably connected to the upper connector 2, and the connection is sealed by a seal. In this embodiment, the hydraulic anchor assembly 31 and the upper connector 2 are detachably connected by a threaded connection, and the seal is specifically a sealing ring. A first capillary channel 311 is provided on the body of the hydraulic anchor assembly 31 along the X-axis. An installation hole 312 is also provided on the side wall of the hydraulic anchor assembly 31. The button clip 32 is provided in the installation hole 312 with the toothed surface of the button clip 32 facing outward. The leaf spring 33 is provided on the button clip 32 and is detachably connected to the hydraulic anchor assembly 31. In this embodiment, the leaf spring 33 is connected to the hydraulic anchor assembly 31 by a bolt. The bolt passes through the leaf spring 33 and is screwed into the threaded hole reserved in the hydraulic anchor assembly 31. Before setting, leaf spring 33 is used to pre-tighten button slip 32. During setting, it helps to lift button slip 32, ensuring that button slip 32 can move smoothly under pressure. When the lower annular pressure is greater than the upper annular pressure, it is lifted, and button slip 32 engages with the sleeve wall, playing an anchoring role. As a preferred technical solution in this embodiment, there are at least six mounting holes 312, with each pair of mounting holes 312 forming a group. The central axis of each group of mounting holes 312 is parallel to the X-axis direction. The three groups of mounting holes are evenly distributed around the outer periphery of the hydraulic anchor assembly 31. Each mounting hole 312 is provided with a button clip 32, and a leaf spring 33 is provided above each button clip 32. This symmetrical layout can make the hydraulic anchor assembly 31 more evenly stressed, avoid structural deformation caused by local stress concentration, effectively improve the stability of the anchoring mechanism 3, and at the same time increase the number of contact points between the button clips 32 and the sleeve, thereby improving the overall anchoring effect. Even if one or several button clips 32 are damaged, the remaining clips 442 can still provide sufficient anchoring force, improving the fault tolerance and operational safety of the entire device.

[0043] See also Figure 2 and Figure 3 The setting mechanism 4 is mounted on the main spindle 1. One end of the setting mechanism 4 is detachably connected to the anchoring mechanism 3 and the connection is sealed by a seal. The other end is detachably connected to the main spindle 1. In this embodiment, one end of the setting mechanism 4 extends into the anchoring mechanism 3, and the other end is detachably fixed to the main spindle 1 by the second shear pin 4431. The seal is specifically a sealing ring. The setting mechanism 4 body is provided with a second capillary channel 4131 that communicates with the first capillary channel 311 along the X-axis. The first capillary channel 311 and the second capillary channel 4131 serve as flow channels for high-pressure fluid.

[0044] Specifically, the setting mechanism 4 includes a pressure transmitting component 41, an anti-rebound component 42, a rubber sleeve component 43, and a locking component 44, which are sequentially sleeved on the main spindle 1 along the X-axis. One end of the pressure transmitting component 41 is detachably connected to the anchoring mechanism 3 and the connection is sealed by a seal, while the other end is detachably connected to the main spindle 1. In this embodiment, one end of the pressure transmitting component 41 extends into the anchoring mechanism 3, and the other end is detachably fixed to the main spindle 1 by a second shear pin 4431, and the seal is specifically a sealing ring; the anti-rebound component 42 is located between the pressure transmitting component 41 and the rubber sleeve component 43. The pressure transmission assembly 41 is detachably connected to the rubber sleeve assembly 43 and the connection is sealed by a seal. The rubber sleeve assembly 43 is detachably connected to the slip assembly 44 and the slip assembly 44 is detachably connected to the main spindle 1. In this embodiment, the pressure transmission assembly 41 and the rubber sleeve assembly 43, and the rubber sleeve assembly 43 and the slip assembly 44 are all detachably connected by threaded connection. The seal is specifically a sealing ring. The slip assembly 44 is detachably connected to the piston spindle 411 through the lug 4113. The second shear pin 4431 passes through the piston spindle 411 and is screwed into the first threaded hole reserved in the main spindle 1.

[0045] See also Figure 2The pressure transmission assembly 41 includes a piston spindle 411, a piston 412, a piston cylinder 413, a first shear pin 414, and a pressure transmission tube 415. The piston spindle 411 is sleeved on the main spindle 1, and the main spindle 1 has a stop surface 11 at the end near the slip assembly 44. The piston spindle 411 has a limiting surface 4111 at the end near the slip assembly 44. The stop surface 11 and the limiting surface 4111 contact and cooperate to limit the piston spindle 411 from moving further along the X-axis. The piston spindle 411 is detachably connected to the anchoring mechanism 3, and the connection is sealed by a seal. In this embodiment, one end of the piston spindle 411 extends directly into the hydraulic anchor assembly 31, and the other end of the piston spindle 411 is detachably fixed to the main spindle 1 by the second shear pin 4431. The overlapping part of the piston spindle 411 and the hydraulic anchor assembly 31 is sealed with a sealing ring. Piston 412 is sleeved on piston spindle 411. The outer wall of piston 412 and the inner wall of rubber sleeve assembly 43 are detachably connected by a threaded connection, and the connection is sealed by a sealing element, specifically a sealing ring. Anti-rebound assembly 42 is disposed in the sealed space formed by piston 412, piston spindle 411, and the inner wall of rubber sleeve assembly 43 along the X-axis. Piston cylinder 413 is sleeved on piston 412 and is detachably connected to the outer wall of rubber sleeve assembly 43 by a first shear pin 414. In this embodiment, the first shear pin 414 passes through piston cylinder 413 and is screwed into the threaded hole reserved in the first rubber sleeve support ring 432 to achieve the detachable connection between piston cylinder 413 and rubber sleeve assembly 43. The second capillary channel 4131 along the X-axis is provided on the piston cylinder 413 body. The two ends of the pressure transmission tube 415 are respectively inserted into the anchoring mechanism 3 and the piston cylinder 413 body, and the inner cavity of the pressure transmission tube 415 is connected to the first capillary channel 311 and the second capillary channel 4131 respectively.

[0046] See also Figure 3 The anti-rebound assembly 42 includes a spring 421 and a C-shaped inner cone slip 422. Both the spring 421 and the C-shaped inner cone slip 422 are annularly arranged on the piston spindle 411. Along the X-axis, the spring 421 is positioned between the pressure transmission assembly 41 and the C-shaped inner cone slip 422. Both the spring 421 and the C-shaped inner cone slip 422 are located within the sealed space formed by the piston 412, the piston spindle 411, and the inner wall of the rubber sleeve assembly 43. The outer wall of the piston spindle 411 is provided with externally countersunk teeth 4112, and the inner wall of the C-shaped inner cone slip 422 is provided with... During the setting process, the inner countersunk teeth 4221, when compressed, push the C-shaped inner cone slip 422 to move along the X-axis. After setting is completed, the spring 421 still maintains a thrust in the X-axis direction on the C-shaped inner cone slip 422, so that the inner countersunk teeth 4221 on the C-shaped inner cone slip 422 and the outer countersunk teeth 4112 on the piston spindle 411 interlock and mesh, so that the C-shaped inner cone slip 422 is firmly fixed on the piston spindle 411. This can completely suppress the rubber sleeve rebound and ensure long-term sealing reliability.

[0047] See also Figure 2 The rubber sleeve assembly 43 includes a rubber sleeve mandrel 431, a rubber sleeve support ring, and a rubber sleeve. The rubber sleeve support ring includes a first rubber sleeve support ring 432 and a second rubber sleeve support ring 436. The rubber sleeve mandrel 431 is sleeved on the piston mandrel 411. The rubber sleeve support ring is located at both ends of the rubber sleeve mandrel 431. The inner wall of the rubber sleeve support ring is detachably connected to the rubber sleeve mandrel 431, and the connection is sealed by a sealing element. In this embodiment, the inner wall of the rubber sleeve support ring and the rubber sleeve mandrel 431 are connected by a threaded connection to achieve a detachable connection, and the sealing element is specifically a sealing ring. The rubber sleeve is fitted on the rubber sleeve spindle 431 and located between the first rubber sleeve support ring 432 and the second rubber sleeve support ring 436. The outer wall of the first rubber sleeve support ring 432 is detachably connected to the piston cylinder 413 through the first shear pin 414. Specifically, the first shear pin 414 passes through the piston cylinder 413 and is screwed into the threaded hole reserved on the outer wall of the first rubber sleeve support ring 432. The second rubber sleeve support ring 436 is detachably connected to the slip assembly 44. In this embodiment, the inner wall of the second rubber sleeve support ring 436 and the outer wall of the slip mandrel 441 are connected by threads to achieve the detachable connection between the second rubber sleeve support ring 436 and the slip assembly 44. The rubber sleeve includes a first rubber sleeve 433, a second rubber sleeve 434 and a third rubber sleeve 435 in sequence along the X-axis direction. The second rubber sleeve 434 has a trapezoidal structure with a wider bottom and a narrower top along the cross section perpendicular to the X-axis direction. This trapezoidal structure design allows the second rubber sleeve 434 to more effectively generate radial plastic deformation and expansion when subjected to the compression of the setting load, forming the main sealing section to tightly fit the well wall or casing wall and achieve reliable sealing. The first rubber sleeve 433 and the third rubber sleeve 435 are located on both sides of the second rubber sleeve 434, forming a multi-stage sealing structure.

[0048] See also Figure 2 and Figure 3 The slip assembly 44 includes, along the X-axis, a slip mandrel 441, a slip 442, and a slip assembly 442. The slip mandrel 441 is sleeved on the piston mandrel 411 and is detachably connected to the second rubber sleeve support ring 436. The slip mandrel 441 has evenly distributed and spaced inclined conical slopes 4411 for guiding the slip 442 to wedge or release. The inclined conical slopes 4411 have dovetail grooves. The slip assembly 442 has a first slot. The slip 442 is disposed on the inclined conical slopes 4411, with one end of the slip 442 inserted into the dovetail groove and the other end inserted into the first slot.

[0049] See also Figure 1The slip mandrel 441 and slip assembly 442 are movably connected by a connecting guide 4412. The slip mandrel 441 has a radial second threaded hole, and the slip assembly 442 has a radial guide hole. One end of the connecting guide 4412 is screwed into the second threaded hole, and the other end is inserted into the guide hole. In this embodiment, the connecting guide 4412 is specifically a connecting rod with a thread at one end. A washer 44121 and a hexagonal nut 44122 are also sequentially fitted on the connecting rod along the X-axis. The hexagonal nut 44122 is screwed onto the threaded end of the connecting rod, that is, the end near the slip mandrel 441. The hexagonal nut 44122 is used to lock the threaded connection between the connecting guide 4412 and the slip mandrel 441, and the washer 44121 is used to increase the friction between the hexagonal nut 44122 and the slip mandrel 441.

[0050] See also Figure 2 The piston spindle 411 is provided with a first keyway, and the first keyway is connected to a lug 4113 by a spring pin 4114. The slip assembly 442 is provided with a second keyway 4432, and the slip assembly 442 is detachably connected to the piston spindle 411 by the lug 4113. The main spindle 1 is provided with a third keyway 12. During setting, the lug 4113 engages with the second keyway 4432. When the packer is lifted to release the seal, the piston spindle 411 slides down relative to the main spindle 1, and the lug 4113 slides from the second keyway 4432 into the third keyway 12.

[0051] See also Figure 2 and Figure 3 The piston spindle 411 is detachably connected to the main spindle 1 via the second shear pin 4431. The second shear pin 4431 passes through the side wall of the piston spindle 411 and is screwed into the threaded hole reserved in the main spindle 1, thus fixing the relative positions of the piston spindle 411 and the main spindle 1.

[0052] During setting, first connect the capillary tube of the ground pump equipment to the first capillary channel 311 of the packer. Then, lower the packer into the predetermined position along with the tubing string. At this time, the packer is placed vertically with the upper connector 2 at the top and the slip assembly 44 at the bottom. The ground pump equipment outputs high-pressure fluid to the first capillary channel 311 and the second capillary channel 4131. After the high-pressure fluid enters the piston 412 chamber, it directly acts on the piston 412. When the pressure of the high-pressure fluid reaches the set value, the first shear screw of the setting is sheared, and the piston 412 is driven by the pressure of the high-pressure fluid. The piston 412 moves downwards, pushing the anti-rebound assembly 42, the rubber sleeve assembly 43, and the slip assembly 44 downwards. As the ground pump continues to pressurize, the piston 412 continues to move downwards, causing the rubber sleeve to expand under pressure until it completely seals against the inner wall of the casing. Simultaneously, the slip mandrel 441 moves further downwards with the piston 412, causing the slip 442 to move along the inclined conical surface 4411 of the slip mandrel 441, gradually opening up. When the minimum setting pressure is reached, the slip 442 is completely pushed open and engaged with the casing. At this point, the rubber sleeve is compressed and sealed, the slip 442 is opened and anchored, and the packer completes setting.

[0053] When lifting the packer to release and recover it, the upper annular pressure is increased to be greater than the lower annular pressure, causing the button slip 32 to retract back into the hydraulic anchor assembly 31. Then, the entire pipe string (including the casing and the packer inside the casing; the casing and the casing are two different objects, with the packer fitted inside the casing cavity and the casing and packer coaxially threaded together) is lifted, causing the packer to rise and thus shearing the second shear pin 4431. At this time, the piston spindle 411 slides down relative to the main spindle 1, and the lug... 4113 slides from the second keyway 4432 into the third keyway 12. After the slip assembly 442 loses its support, it slides downward, which in turn drives the slip 442 to move downward, causing the slip 442 to retract and no longer anchored to the casing wall. As the slip 442 retracts, the slip mandrel 441 and the rubber sleeve support ring connected to the slip 442 also slide downward. The rubber sleeve loses its support and will also shrink back to its original shape. After the packer is completely unsealed, the well string is lifted up and the entire well tool string is retrieved from the well. It is worth noting that by setting the anchoring mechanism 3 in the packer, after the packer is set, it is subjected to pressure from the lower annulus. The pressure of the fluid in the well is transmitted to the button slip 32 through the internal gaps of the packer. When the lower annulus pressure is greater than the upper annulus pressure, the button slip 32 is opened and anchored to the casing wall. At this time, as long as the pressure of the high-pressure fluid is controlled, it will not affect the second shear pin 4431, and there is no need to worry about the lower annulus pressure being too high and causing the packer to unseal. When the packer is lifted to unseal, by simply making the upper annulus pressure greater than the lower annulus pressure, the button slip 32 retracts and no longer anchors to the casing wall, which will not affect the packer retrieval.

[0054] In summary, this application provides a capillary-set packer with a modular design of the main spindle 1, upper connector 2, anchoring mechanism 3, and setting mechanism 4. Combined with the first and second capillary channels 4131, it forms a high-pressure fluid passage communicating with the piston 412 chamber. High-pressure fluid is precisely driven by a surface pump to achieve rapid and reliable setting. It eliminates the need for ball droppers or plugs, greatly simplifying the setting process. Real-time adjustment of the fluid output pressure via the surface pump allows adaptation to dynamic well conditions, improving setting flexibility and controllability. The high-pressure fluid exists only in the first and second capillary channels 4131, and pressure transmission is unaffected by well fluid properties, resulting in a high setting success rate. The setting method is unaffected by other tools; each packer has an independent high-pressure fluid passage, supporting various sealing methods. The packers are independently set, avoiding mutual interference between packers; effectively solving the problem of secondary setting; when there is leakage of the rubber sleeve or unsatisfactory setting, high-pressure fluid can be output from the surface pump equipment at any time to recompact the rubber sleeve or continue pressurizing until complete setting, ensuring the reliability and stability of downhole operations; unsealing is convenient and safe, by adjusting the annular pressure difference to retract the button slip 32, and lifting the tubing string can cut the second shear pin 4431 to achieve automatic unsealing. The slip 442 retracts synchronously with the rubber sleeve, eliminating the need for downhole cutting operations, reducing recovery risks and time costs; this technical solution not only improves the adaptability and setting success rate of packers, but also significantly reduces operating costs and construction time, and has good engineering application prospects, which is of great significance for promoting the intelligent and efficient development of oilfields.

[0055] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A capillary-set packer, characterized in that, include: Main spindle; An upper connector is located at one end of the main spindle and is detachably connected to the main spindle. An anchoring mechanism is sleeved on the main spindle and is detachably connected to the upper connector. The anchoring mechanism body is provided with a first capillary channel communicating with the external environment along the X-axis direction. The setting mechanism is sleeved on the main spindle. One end of the setting mechanism is detachably connected to the anchoring mechanism, and the other end is detachably connected to the main spindle. A second capillary channel communicating with the first capillary channel is provided on the body of the setting mechanism along the X-axis direction.

2. The capillary-seated packer according to claim 1, characterized in that, The anchoring mechanism includes a hydraulic anchor assembly, a button slip, and a leaf spring. The hydraulic anchor assembly is sleeved on the main spindle and detachably connected to the upper connector. The first capillary channel along the X-axis is provided on the hydraulic anchor assembly. The hydraulic anchor assembly also has mounting holes on its side wall. The button slip is located in the mounting holes with its toothed surface facing outwards. The leaf spring is located on the button slip and detachably connected to the hydraulic anchor assembly.

3. The capillary-seated packer according to claim 2, characterized in that, There are at least six mounting holes, with two mounting holes forming a group. The central axis of each group of mounting holes is parallel to the X-axis. The three groups of mounting holes are evenly spaced around the outer periphery of the hydraulic anchor assembly. Each mounting hole is equipped with a button clip, and each button clip is equipped with a leaf spring above it.

4. The capillary-seated packer according to claim 1, characterized in that, The setting mechanism includes a pressure transmitting component, an anti-rebound component, a rubber sleeve component, and a slip component sequentially sleeved on the main mandrel along the X-axis. One end of the pressure transmitting component is detachably connected to the anchoring mechanism, and the other end is detachably connected to the main mandrel. The anti-rebound component is located between the pressure transmitting component and the rubber sleeve component. The pressure transmitting component is detachably connected to the rubber sleeve component, the rubber sleeve component is detachably connected to the slip component, and the slip component is detachably connected to the main mandrel.

5. The capillary-seated packer according to claim 4, characterized in that, The pressure transmission assembly includes a piston mandrel, a piston, a piston cylinder, a first shear pin, and a pressure transmission tube. The piston mandrel is sleeved on the main mandrel and is detachably connected to the anchoring mechanism. The piston is sleeved on the piston mandrel, and the outer wall of the piston is detachably connected to the inner wall of the rubber sleeve assembly. Along the X-axis, the anti-rebound assembly is disposed within the sealed space formed by the piston, the piston mandrel, and the inner wall of the rubber sleeve assembly. The piston cylinder is sleeved on the piston and is detachably connected to the outer wall of the rubber sleeve assembly via the first shear pin. Along the X-axis, a second capillary channel is disposed on the piston cylinder body. The two ends of the pressure transmission tube are respectively inserted into the anchoring mechanism and the piston cylinder body, and the inner cavity of the pressure transmission tube communicates with the first capillary channel and the second capillary channel, respectively.

6. The capillary-seated packer according to claim 5, characterized in that, The anti-rebound assembly includes a spring and a C-shaped inner cone slip. Both the spring and the C-shaped inner cone slip are arranged around the piston spindle. Along the X-axis, the spring is located between the pressure transmission assembly and the C-shaped inner cone slip. Both the spring and the C-shaped inner cone slip are located within the sealed space formed by the piston, the piston spindle, and the inner wall of the rubber sleeve assembly.

7. The capillary-seated packer according to claim 5, characterized in that, The rubber sleeve assembly includes a rubber sleeve mandrel, a rubber sleeve support ring, and a rubber sleeve. The rubber sleeve support ring includes a first rubber sleeve support ring and a second rubber sleeve support ring. The rubber sleeve mandrel is sleeved on the piston mandrel. The rubber sleeve support ring is located at both ends of the rubber sleeve mandrel. The inner wall of the rubber sleeve support ring is detachably connected to the rubber sleeve mandrel. The rubber sleeve is sleeved on the rubber sleeve mandrel and located between the first rubber sleeve support ring and the second rubber sleeve support ring. The outer wall of the first rubber sleeve support ring is detachably connected to the piston cylinder through a first shear pin. The second rubber sleeve support ring is detachably connected to the slip assembly. The rubber sleeve includes a first section, a second section, and a third section sequentially along the X-axis.

8. The capillary-seated packer according to claim 7, characterized in that, The slip assembly includes, in sequence along the X-axis, a slip mandrel, a slip, and a slip assembly. The slip mandrel is sleeved on the piston mandrel and is detachably connected to the second rubber sleeve support ring. The slip mandrel has evenly distributed and spaced inclined conical slopes, and dovetail grooves are provided on the inclined conical slopes. The slip assembly has a first slot. The slip is disposed on the inclined conical slope, with one end inserted into the dovetail groove and the other end inserted into the first slot. The slip mandrel and the slip assembly are movably connected by a connecting guide.

9. The capillary-seated packer according to claim 8, characterized in that, The slip assembly is detachably connected to the piston spindle via a lug, and the piston spindle is detachably connected to the main spindle via a second shear pin.

10. The capillary-seated packer according to claim 8, characterized in that, The slip mandrel has a second radial screw hole, the slip assembly has a radial guide hole, one end of the connecting guide is screwed into the second screw hole, and the other end is inserted into the guide hole.

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