A high pressure packer

Abstract

The application discloses a high-pressure packer and belongs to the technical field of oil production engineering equipment. The high-pressure packer comprises a pipe column, a sealing sleeve, a first push piston, a medicament sleeve, a second push piston and an expansion medicament. The medicament sleeve is sleeved on the pipe column, one end of the sealing sleeve away from the sealing sleeve is connected with the pipe column, an annular medicament filling groove is formed between the medicament sleeve and the outer circumferential surface of the pipe column, the expansion medicament is arranged in the medicament filling groove, and a liquid injection port is arranged at the bottom of the medicament filling groove. The sealing sleeve is sleeved on the pipe column, one end of the first push piston is abutted against the end of the sealing sleeve, and the other end of the first push piston is embedded in the medicament filling groove. The second push piston is arranged in the medicament filling groove, and the second push piston and the first push piston are respectively located on the two sides of the expansion medicament. The high-pressure packer provided by the application can realize multi-stage setting, adapt to fluctuating steam injection pressure and improve the sealing reliability in the high-temperature and high-pressure environment downhole.

Description

Technical Field

[0001] This application belongs to the technical field of oil production engineering equipment, and in particular relates to a high-pressure packer. Background Technology

[0002] In the production of heavy oil wells, steam injection technology is involved, and a high-temperature, high-pressure packer is installed in the casing. The packer used in existing heavy oil thermal recovery wells achieves a seal by expanding the sleeve on the packer body under pressure and contacting the inner wall of the casing.

[0003] Typically, packers have a pressure resistance rating of 17 MPa, meaning they can withstand 17 MPa of steam injection pressure while maintaining a stable seal, reliably meeting the production requirements of steam injection and production processes. However, in actual production, due to downhole conditions, the steam injection pressure can fluctuate significantly, reaching 19 MPa or even higher. In thermal recovery, steam injection pressures exceeding 17 MPa will lead to a deterioration in the sealing effect, directly impacting insulation and stratified steam injection effectiveness, and may also damage the look-down tubing, affecting production efficiency. Summary of the Invention

[0004] This application provides a high-pressure packer, aiming to at least partially solve the technical problems of poor ability to cope with large fluctuations in injection steam pressure and unstable sealing performance of high-pressure packers. Therefore,

[0005] This application provides a high-pressure packer, comprising: a tubing string, a sealing sleeve, a primary push piston, a chemical sleeve, a secondary push piston, and an expansion agent; The agent sleeve is fitted onto the tubing column, and the end of the sealing sleeve away from the sealing sleeve is connected to the tubing column. An annular agent filling groove is formed between the agent sleeve and the outer circumferential surface of the tubing column. The expanding agent is placed in the agent filling groove, and an injection port is provided at the bottom of the agent filling groove. The sealing sleeve is fitted onto the tubing column. One end of the first-stage push piston abuts against the end of the sealing sleeve, and the other end is embedded in the agent filling groove. When the expanding agent expands, it pushes the first-stage push piston to compress the sealing sleeve along the axial direction of the sealing sleeve, causing the sealing sleeve to arch radially. The secondary push piston is disposed in the agent filling groove, and the secondary push piston and the primary push piston are respectively located on both sides of the expanding agent, sealing the expanding agent in the agent filling groove. After fluid is introduced into the injection port, the secondary push piston is pushed to compress the expanding agent in the expanded state, thereby indirectly pushing the primary push piston to further compress the sealing sleeve.

[0006] In some embodiments, the primary push piston and / or the secondary push piston are annular components fitted onto the tubing.

[0007] In some embodiments, a secondary shear pin is connected between the secondary push piston and the tubing.

[0008] In some embodiments, the high-pressure packer further includes anchoring components disposed at both ends of the sealing sleeve to synchronously arch radially and anchor to the packing object when the sealing sleeve is compressed, thereby limiting the axial swing of the sealing sleeve.

[0009] In some embodiments, the anchoring assembly includes: an outer support member and an inner support member; The outer support is connected to the tubular column, and the inner support is connected to the end of the sealing sleeve. The inner support is embedded in the outer support so that when the sealing sleeve is subjected to axial pressure, the inner support pushes the inner support into the outer support, compressing the outer support to expand radially, thereby anchoring it to the sealing object.

[0010] In some embodiments, a push-receiving inclined surface is provided on the inner wall of the outer support member, and the inner support member abuts against the push-receiving inclined surface.

[0011] In some embodiments, anchoring particles are provided on the outer peripheral surface of the outer support member.

[0012] In some embodiments, protective rings are respectively fitted to both ends of the sealing sleeve to maintain the cylindrical shape of both ends of the sealing sleeve when subjected to axial pressure.

[0013] In some embodiments, the high-pressure packer further includes: a constraint sleeve and an unlocking piston; The constraint sleeve is fitted onto the tubing, and the unlocking piston is slidably fitted onto the tubing and positioned between the constraint sleeve and the tubing. The sealing sleeve is fitted onto the unlocking piston, and the end of the sealing sleeve away from the first-stage push piston abuts against the restraint sleeve.

[0014] In some embodiments, an unlocking shear pin is connected between the unlocking piston and the tubing.

[0015] The embodiments of this application have at least the following beneficial effects: The high-pressure packer provided in this application embodiment forms an annular agent filling groove through a tubing string and an agent sleeve nested together. This groove stores an expanding agent, which pushes a primary pusher piston embedded within the filling groove, thereby compressing the sealing sleeve fitted on the tubing string. This causes the sleeve to expand radially, contacting and sealing the object to be packed, thus achieving a normal setting function. Furthermore, a secondary pusher piston is provided within the filling groove, positioned on either side of the expanding agent alongside the primary pusher piston. An injection hole is located at the bottom of the filling groove, allowing high-pressure fluid to be injected to push the secondary pusher piston, compressing the expanded agent and indirectly pushing the primary pusher piston. This further compresses the sealing sleeve, increasing the degree of radial expansion and enhancing the contact pressure with the object to be packed. This further strengthens the setting strength and stability, achieving a two-stage setting and improving the adaptability to radial steam injection pressure fluctuations and the stability of the packer seal. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the high-pressure packer in an embodiment of this application is shown; Figure 2 It shows Figure 1 A schematic diagram of the external support components of a high-pressure packer in a high-pressure system; Figure 3 It shows Figure 2 Sectional view in; Figure 4 It shows Figure 1 A schematic diagram of the sealing sleeve of a high-pressure packer.

[0018] Figure label: 100-Tube string, 110-Reagent sleeve, 111-Reagent filling tank, 112-Injection port; 200 - Constraint sleeve, 210 - First cylinder, 220 - Second cylinder; 300 - Unlocking piston, 310 - First push surface, 311 - First unlocking gap, 320 - Second push surface, 321 - Second unlocking gap, 330 - Unlocking shear pin; 400 - Sealing sleeve, 410 - Fiber heat-coated fluoropolymer, 420 - Polytetrafluoroethylene; 500 - Protective Ring Component; 600-Anchoring component, 610-Outer support, 611-Thrust surface, 612-Notch, 620-Anchor, 630-Inner support; 700 - First stage push piston, 710 - First stage shear pin; 800 - Second stage push piston, 810 - Second stage shear pin; 900 - Expanding agent. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0021] This application is described below with reference to the accompanying drawings and specific embodiments: In heavy oil well steam injection and production, packer sections are connected to the steam tubing to seal the outer casing. The packer section mainly consists of the tubing string, a sealing sleeve fitted onto the tubing string, and a pusher piston. An agent filling groove and expanding agent are located on the outside of the tubing string to push the pusher piston, compressing the sealing sleeve and forcing it to arch radially, contacting and setting against the inner wall of the outer casing to achieve a seal.

[0022] However, once the expanding agent is activated and expands, it will maintain a certain volume, so that the radial expansion of the push piston will also be in a stable state, thus the sealing strength will not increase. When the downhole operating conditions change and the steam injection pressure fluctuates, the risk of failure to seal will increase sharply after exceeding the pressure limit, which is not conducive to safe production.

[0023] Therefore, this application provides a high-pressure packer, which aims to improve the ability of the high-pressure packer to adapt to steam injection pressure fluctuations to a certain extent, so as to maintain the reliability and stability of the setting seal.

[0024] Figure 1 A schematic diagram of the high-pressure packer in an embodiment of this application is shown; combined with Figure 1 In some embodiments, the high-pressure packer may include: a tubing 100, a sealing sleeve 400, a primary push piston 700, a chemical sleeve 110, a secondary push piston 800, and an expansion agent 900.

[0025] The agent sleeve 110 is sleeved on the tubing 100, and the end of the agent sleeve 110 away from the sealing sleeve 400 is connected to the tubing 100 to form an annular agent filling groove 111 between the agent sleeve 110 and the outer circumferential surface of the tubing 100. The expanding agent 900 is disposed in the agent filling groove 111, so that the expanding agent 900 can be stimulated to expand in the agent filling groove 111 and output driving force to the groove opening, forming a piston-like working structure, which serves as the power source for the packer's sealing action.

[0026] The sealing sleeve 400 serves as a sealing element, contacting and sealing the object to be sealed. The sealing sleeve 400 can be sleeved on the tubing column 100, and one end of the sealing sleeve 400 can abut against the thrust portion on the tubing column 100. The first end of the first-stage push piston 700 abuts against the other end of the sealing sleeve 400, and the second end of the first-stage push piston 700 is embedded in the agent filling groove 111. When the expanding agent 900 expands, it pushes the first-stage push piston 700 to compress the sealing sleeve 400 along the axial direction of the sealing sleeve 400, causing the sealing sleeve 400 to arch radially and abut against the object to be sealed, thus achieving contact sealing.

[0027] Generally, the expansion agent 900 can be activated by stability, thereby adapting to the steam injection and production process and stabilizing the setting seal; and can maintain the expansion degree of the expansion agent 900 during the injection and production process, maintain the compression strength of the first-stage push piston 700 on the sealing sleeve 400, thereby maintaining the deformation degree and setting strength of the sealing sleeve 400.

[0028] The secondary push piston 800 is disposed within the agent filling groove 111, and the secondary push piston 800 and the primary push piston 700 are respectively disposed on both sides of the expanding agent 900, sealing the expanding agent 900 within the agent filling groove 111. Thus, after the expanding agent 900 expands, it can push the push piston 700 and the secondary push piston 800 respectively. An injection port 112 can be opened at the bottom of the agent filling groove 111, so that fluid can be introduced through the injection port 112 to push the secondary push piston 800, thereby compressing the expanded agent 900 in an expanded state, indirectly pushing the primary push piston 700 to further compress the sealing sleeve 400, thereby increasing the radial expansion degree and contact setting pressure of the sealing sleeve 400, improving sealing reliability and pressure resistance, adapting to pressure fluctuations of injection and production steam, increasing pressure resistance, and maintaining sealing reliability even when changes in downhole operating conditions lead to a significant increase in steam injection and production pressure.

[0029] In some embodiments, the injection port 112 can connect the lumen of the tubing string 100 and the lower part of the cavity of the reagent filling tank 111, so that the steam flowing through the lumen of the tubing string 100 serves as the power source for the secondary setting seal, driving the secondary push piston 800 to move; thereby, when the injection and production steam pressure increases by a certain amount, it can adaptively move under the push, realize adaptive secondary setting seal, enhance pressure resistance and adaptability to fluctuations in the injection and production conditions, and improve setting seal performance.

[0030] In some embodiments, the injection port 112 may also be connected to other hydraulic or pneumatic sources as an independent drive system. When a significant increase in the downhole injection and production steam pressure is detected, the hydraulic or pneumatic source is triggered to push the secondary push piston 800 to compress and expand the expansion agent 900.

[0031] In some embodiments, a separate pressure detection component and a controller unit may be provided. The pressure detection component may be connected in parallel to the controller unit to monitor the pressure of the injection and production steam in real time. Based on the pressure information, the control unit controls the hydraulic source or the pressure source to operate, so as to push the secondary push piston 800 to compress and expand the expansion agent.

[0032] In some embodiments, a secondary shearing pin 810 can be connected between the secondary push piston 800 and the tubing 100. When the steam pressure in the tubing 100 increases to a certain level, the secondary push piston 800 is sheared by force to maintain the primary setting action of the primary push piston 700 under normal conditions. When the steam pressure increases by a certain amount, the secondary push piston 800 is triggered to achieve secondary setting.

[0033] In some embodiments, the primary push piston 700 and / or the secondary push piston 800 may be configured as an annular component, sleeved on the tubular column 100, to achieve uniform and stable force distribution and implement stable pushing action.

[0034] A sealing element or sealing structure can also be provided between the first-stage push piston 700 and the second-stage push piston 800 and the outer peripheral surface of the tubing 100 and the inner wall surface of the agent sleeve 110 to maintain the sealing performance of the expansion space of the expanding agent 900, thereby maintaining the stability and reliability of the setting operation.

[0035] In some embodiments, the packer short section is connected to a steam injection pipe string upstream and downstream. Disturbances in the upstream and downstream equipment can cause the sealing sleeve to swing up and down, creep, and other posture changes that affect the contact sealing state. To address this, the high-pressure packer also includes an anchoring assembly 600, which is disposed at both ends of the sealing sleeve 400. When the sealing sleeve 400 is compressed, it synchronously arches radially and anchors to the sealing object, thereby limiting the axial swing and creep of the sealing sleeve 400 as a limiting stop.

[0036] Figure 2 It shows Figure 1 A schematic diagram of the external support components of a high-pressure packer in a high-pressure system; Figure 3 It shows Figure 2 The sectional view in the image.

[0037] See Figure 1 , Figure 2 and Figure 3 In some embodiments, the anchoring assembly 600 may include an outer support 610 and an inner support 630 nested together; the outer support 610 is connected to the column 100, and the inner support 630 is connected to the end of the sealing sleeve 400 so that when the sealing sleeve 400 is subjected to axial pressure, the inner support 630 pushes into the outer support 610 to compress the outer support 610 to expand radially, thereby anchoring it to the sealing object.

[0038] It is worth noting that the outer support 610 may be made of an elastically deformable material, such as rubber.

[0039] In some embodiments, the outer support 610 and the inner support assembly 630 form an anchoring slip, which can reduce the anchoring force required for the steam injection string and reduce string creep to a certain extent. Alternatively, the outer support can be made of soft metal slip, which can improve the smoothness of unsealing, is easy to mill, and is less likely to cause stuck well accidents.

[0040] In some embodiments, in order to improve the deformation uniformity and stability of the outer support member 610, a push-receiving inclined surface 611 is provided on the inner wall of the outer support member 610, and the inner support member 630 abuts against the push-receiving inclined surface 611 to facilitate uniform deformation under push.

[0041] In some embodiments, in order to further enhance the anchoring strength and increase contact friction, anchors 620, such as anchoring particles, can be provided on the outer peripheral surface of the outer support 610. Specifically, alloy particles embedded in the outer peripheral surface of the outer support 610 can be used.

[0042] In some embodiments, the inner support 630 may be a main body that can stably withstand and transmit the pushing pressure.

[0043] Correspondingly, the surface of the inner support 630 that contacts the pushing surface 611 can be set as a matching inclined surface, so that when the two are close to each other, they can be stably pushed through surface-to-surface contact, maintaining the uniformity of the radial expansion arch of the outer support 610 and improving the anchoring strength.

[0044] In some embodiments, the outer support 610 and the inner support 630 may be configured as rings and sleeved on the column 100, thereby enabling stable installation.

[0045] In some embodiments, considering that the expansion of the end of the annular outer support 610 will stretch the port area to a certain extent, increasing the risk of irregular tearing and affecting the reliability of anchoring, a number of notches 612 can be provided at the port of the outer support 610 to expand the absorption of tensile deformation during expansion and reduce excessive random tearing.

[0046] In some embodiments, the radial arches of the sealing sleeve 400 are mostly distributed in the middle of the cylinder, and the two ends of the cylinder bear the thrust in a concentrated manner. In order to improve the uniformity of the shape change and the uniformity of the force at the annular ends and reduce the risk of tearing and buckling, the two ends of the sealing sleeve 400 can be respectively fitted with protective rings 500 so as to maintain the cylindrical state of the two ends of the sealing sleeve when subjected to axial pressure, so that the force can be borne as a whole, thereby suppressing the risk of buckling and tearing.

[0047] In some embodiments, the protective ring 500 may be a flexible metal ring.

[0048] In some embodiments, considering the force on the end face of the sealing sleeve 400, in order to reduce uneven stress tearing, the protective ring 500 can be looped around the end circumferential surface of the sealing sleeve 400 and can also cover the end face of the sealing sleeve 400 to bear the pressure as a whole.

[0049] In some embodiments, in order to reduce the movement of the first-stage push piston 700 under external force before it moves, which would affect the setting action, a first-stage shear pin 710 may be provided between the first-stage push piston 700 and the tubular column 100 to maintain the initial position.

[0050] In some embodiments, the deformation setting reliability and service life of the sealing sleeve 400 are related to the deformation range. In order to keep the sealing sleeve 400 within the designed deformation range, the setting contact pressure requirements and service life requirements are taken into account; excessive compression of the sealing sleeve 400 is avoided, which would affect the setting reliability and service life.

[0051] Therefore, a stop structure can be provided between the first-stage push piston 700 and the tubular column 100. After the first-stage push piston 700 moves to a preset position, it is stopped to prevent further compression of the sealing sleeve 400.

[0052] Of course, the stop structure should be a breakable stop structure, and the pressure to break through the stop structure should be comparable to the pressure of the secondary push piston 800 cutting the secondary shear pin 810. Thus, the primary push piston 700 can only break through the stop structure and further compress the sealing sleeve 400 when the secondary push piston 800 is pushed.

[0053] In some embodiments, the stop structure may be configured as a shear pin protruding from the column 100 and located on the pushing trajectory of the first-stage push piston 700, so that when the first-stage push piston 700 is subjected to a thrust greater than the shearing pressure, the shear pin is sheared and the piston continues to advance.

[0054] In other embodiments, the stop structure may also be a stop that can interlock with each other, provided on the column 100 and the push piston 700, and the interlocking height of the stop can be experimentally set so that when the first-stage push piston 700 is subjected to a thrust exceeding the preset breakthrough pressure, the interlocking state of the stop is forcibly broken.

[0055] In some embodiments, during the unsealing operation, the contact seal can be forcibly broken by lifting the tubing string 100, and then the packer components can be repaired.

[0056] In other embodiments, adaptive unlocking can be achieved through structural design in conjunction with the lifting operation, thereby reducing damage to the packer.

[0057] Specifically, the high-pressure packer may include a constraint sleeve 200 and an unlocking piston 300; the constraint sleeve 200 is fitted onto the tubing 100, and the unlocking piston 300 is slidably fitted onto the tubing 100 and disposed between the constraint sleeve 200 and the tubing 100, and can slide along the axial direction of the tubing 100.

[0058] The sealing sleeve 400 is fitted onto the unlocking piston 300, and the end of the sealing sleeve 400 away from the first-stage push piston 700 abuts against the constraint sleeve 200, thereby limiting the sealing sleeve 400 so that the sealing sleeve 400 can respond efficiently and perform adaptive deformation when subjected to the pressure of the first-stage push piston 700.

[0059] Therefore, during unsealing, the tubing 100 can be pulled. At this time, the sealing sleeve 400 is affected by the contact resistance between itself and the sealed object, and will not move synchronously or with the same amplitude immediately. As a result, the unsealing piston 300 and the sealing sleeve 400 move together along the axial direction of the tubing 100 relative to the tubing 100 to move away from the restraining sleeve 200. This leaves a gap at the end of the sealing sleeve 400 or between the anchoring assembly 600 and the restraining sleeve 200, so that the deformation of the sealing sleeve 400 and the anchoring assembly 600 in the axial direction of the tubing 100 is reduced or even restored. This significantly reduces the contact pressure and contact resistance between itself and the sealed object, so that the packer can be removed relatively easily and with a low degree of damage.

[0060] In some embodiments, to avoid affecting the setting stability of the sealing sleeve 400 due to the movement of the unlocking piston 300, an unlocking shear pin 330 may be connected between the unlocking piston 300 and the tubing 100.

[0061] Thus, under normal conditions, the unlocking piston 300 is locked on the tubing 100 by the unlocking shear pin 330, and accordingly, it will not move the sealing sleeve 400; when unsealing, the tubing 100 is actively pulled out, and the sealing resistance forces the unlocking piston 300 to shear the unlocking shear pin 330, thereby achieving the switching between the two working states.

[0062] In some embodiments, considering the efficiency of applying force when lifting the tubing 100, a stop and push structure can be provided between the constraint sleeve 200 and the unsealing piston 300 to ensure that the unsealing piston 300 abuts against the constraint sleeve 200 during the lifting process, maintaining the stability of the position and force of the sealing sleeve 400 connected to the unsealing piston 300, and reducing the risk of swing damage and damage to the outer sleeve.

[0063] In some embodiments, a first pushing surface 310 may be provided on the unlocking piston 300, leaving a certain movable gap, namely a first unlocking gap 311, between it and the stop inside the constraint sleeve 200, so as to meet the space requirements for relative movement of the unlocking piston 300, the tubing 100 and the constraint sleeve 200, and also take into account the deformation reset space of the sealing sleeve 400.

[0064] In some embodiments, the constraint sleeve 200 may be divided into two sections, namely a first cylinder 210 and a second cylinder 220 connected to each other, wherein the first cylinder 210 is connected to the pipe column 100, and the second cylinder 220 serves as the stop portion of the sealing sleeve 400 and the anchoring assembly 600.

[0065] Meanwhile, the unsealing piston 300 may also be provided with a second pushing surface 320, and a corresponding second unlocking gap 321 between it and the second cylinder 220.

[0066] An extension ring may be provided at the end of the second cylinder 220 to radially constrain the unsealing piston 300 and maintain its radial posture and position stability. The extension ring may also serve as a stop for the second push surface 320.

[0067] Correspondingly, the other end of the second cylinder 220 can also be embedded inside the first cylinder 210 to serve as a stop for the first push surface 310.

[0068] On the other hand, the design of the split cylinder can reduce the installation difficulty of the constraint sleeve 200 and the unsealing piston 300 to a certain extent.

[0069] See Figure 4 In some embodiments, the sealing sleeve 400 may be made of fiber heat-coated fluoropolymer 410 and polytetrafluoroethylene 420, and may be stacked together in an alternating manner to obtain good temperature resistance and support capacity.

[0070] The embodiments of this application have at least the following beneficial effects: The high-pressure packer provided in this application embodiment forms an annular agent filling groove through a tubing string and an agent sleeve nested together. This groove stores an expanding agent, which pushes a primary pusher piston embedded within the filling groove, thereby compressing the sealing sleeve fitted on the tubing string. This causes the sleeve to expand radially, contacting and sealing the object to be packed, thus achieving a normal setting function. Furthermore, a secondary pusher piston is provided within the filling groove, positioned on either side of the expanding agent alongside the primary pusher piston. An injection hole is located at the bottom of the filling groove, allowing high-pressure fluid to be injected to push the secondary pusher piston, compressing the expanded agent and indirectly pushing the primary pusher piston. This further compresses the sealing sleeve, increasing the degree of radial expansion and enhancing the contact pressure with the object to be packed. This further strengthens the setting strength and stability, achieving a two-stage setting and improving the adaptability to radial steam injection pressure fluctuations and the stability of the packer seal.

[0071] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0072] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0073] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. In this application, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction relationship between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of this application, "multiple" means two or more, unless otherwise explicitly and specifically limited.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0075] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those 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 combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0076] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-pressure packer, characterized in that, include: tubing, sealing sleeve, primary push piston, chemical sleeve, secondary push piston, and expansion agent; The agent sleeve is fitted onto the tubing column, and the end of the agent sleeve away from the sealing sleeve is connected to the tubing column. An annular agent filling groove is formed between the agent sleeve and the outer circumferential surface of the tubing column. The expansion agent is placed in the agent filling groove, and an injection port is provided at the bottom of the agent filling groove. The sealing sleeve is fitted onto the tubing column. One end of the first-stage push piston abuts against the end of the sealing sleeve, and the other end is embedded in the agent filling groove. When the expanding agent expands, it pushes the first-stage push piston to compress the sealing sleeve along the axial direction of the sealing sleeve, causing the sealing sleeve to arch radially. The secondary push piston is disposed in the agent filling groove, and the secondary push piston and the primary push piston are respectively located on both sides of the expanding agent, and the expanding agent is sealed in the agent filling groove. After fluid is introduced into the injection port, the secondary push piston pushes the expanding agent in a compressed and expanded state, thereby indirectly pushing the primary push piston to further compress the sealing sleeve. The secondary push piston is connected to the tubing by a secondary shear pin, which is configured to lock the secondary push piston under normal steam injection pressure, so that the expansion agent can expand independently and push the primary push piston to complete the primary setting seal. The fluid pressure introduced through the injection port is cut off when it reaches or exceeds a preset threshold, so as to allow the fluid to push the expansion agent in the compressed expansion state of the secondary push piston, thereby indirectly pushing the primary push piston to further compress the sealing sleeve and realize the secondary pressure boosting setting seal.

2. The high-voltage packer as described in claim 1, characterized in that, The primary push piston and / or the secondary push piston are annular components that are sleeved on the tubular column.

3. The high-pressure packer as described in claim 1, characterized in that, The high-pressure packer also includes anchoring components disposed at both ends of the sealing sleeve to synchronously arch radially and anchor to the packing object when the sealing sleeve is compressed, thereby limiting the axial swing of the sealing sleeve.

4. The high-pressure packer as described in claim 3, characterized in that, The anchoring assembly includes: an outer support member and an inner support member; The outer support is connected to the tubular column, and the inner support is connected to the end of the sealing sleeve. The inner support is embedded in the outer support so that when the sealing sleeve is subjected to axial pressure, the inner support pushes the inner support into the outer support, compressing the outer support to expand radially, thereby anchoring it to the sealing object.

5. The high-voltage packer as described in claim 4, characterized in that, The inner wall of the outer support member is provided with a push-in inclined surface, and the inner support member abuts against the push-in inclined surface.

6. The high-voltage packer as described in claim 4, characterized in that, Anchoring particles are provided on the outer peripheral surface of the outer support member.

7. The high-voltage packer as described in claim 1, characterized in that, The sealing sleeve is fitted with protective rings at both ends to maintain the cylindrical shape of the two ends of the sealing sleeve when subjected to axial pressure.

8. The high-voltage packer as described in claim 1, characterized in that, The high-pressure packer also includes: a constraint sleeve and an unlocking piston; The constraint sleeve is fitted onto the tubing, and the unlocking piston is slidably fitted onto the tubing and positioned between the constraint sleeve and the tubing. The sealing sleeve is fitted onto the unlocking piston, and the end of the sealing sleeve away from the first-stage push piston abuts against the restraint sleeve.

9. The high-voltage packer as described in claim 8, characterized in that, An unlocking shear pin is connected between the unlocking piston and the tubing.

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