High-pressure packer

Abstract

The invention discloses a high-pressure packer, and belongs to the technical field of oil production engineering equipment. The high-pressure packer comprises a tubular column, a sealing sleeve, a first-stage pushing piston, a medicament sleeve, a second-stage pushing piston and an expansion medicament. The tubular column is sleeved with the medicament sleeve, the end, away from the sealing sleeve, of the sealing sleeve is connected with the tubular column, an annular medicament filling groove is formed between the medicament sleeve and the peripheral face of the tubular column, the expansion medicament is arranged in the medicament filling groove, and a liquid injection opening is formed in the bottom of the medicament filling groove. The sealing sleeve is sleeved on the tubular column, one end of the first-stage pushing piston is propped against the end part of the sealing sleeve, and the other end of the first-stage pushing piston is embedded in the medicament filling groove; the second-stage pushing piston is arranged in the agent filling groove, and the second-stage pushing piston and the first-stage pushing piston are located on the two sides of the expansion agent correspondingly. According to the high-pressure packer, multi-stage setting can be achieved, the high-pressure packer adapts to fluctuating steam injection pressure, and the sealing reliability of the underground high-temperature and high-pressure environment is improved.

Description

Technical Field

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

[0002] During the production of heavy oil wells, steam injection and production technology is involved, and a high-temperature and high-pressure packer is installed in the casing. The existing packers used in heavy oil thermal production wells expand the sleeve on the packer body under pressure to achieve contact and sealing with the inner wall of the casing.

[0003] Usually, the pressure resistance index of the packer is 17MPa, that is, the packer can withstand 17MPa steam injection pressure and maintain a stable sealing effect, which can reliably meet the production requirements of steam injection and production technology. However, in actual production, affected by downhole working conditions, the steam injection pressure will fluctuate greatly and may reach 19MPa or even higher. When the steam injection pressure exceeds 17MPa in thermal production, the sealing effect will deteriorate, which will directly affect the effect of thermal insulation and stratified steam injection, and will also damage the overlooking pipe string, affecting production efficiency. Summary of the invention

[0004] The present application provides a high-pressure packer, which aims to at least to some extent solve the technical problems of the poor ability of the high-pressure packer to cope with large fluctuations in steam injection pressure and unstable sealing performance.

[0005] A high-pressure packer provided in an embodiment of the present application includes: a pipe string, a sealing sleeve, a primary push piston, a medicine sleeve, a secondary push piston and an expansion agent;

[0006] The medicine sleeve is sleeved on the pipe column, and one end of the sealing sleeve away from the sealing sleeve is connected to the pipe column, and an annular medicine filling groove is formed between the medicine sleeve and the outer peripheral surface of the pipe column, the expansion medicine is arranged in the medicine filling groove, and a liquid injection port is opened at the bottom of the medicine filling groove;

[0007] The sealing sleeve is sleeved on the pipe 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, so as to push the first-stage push piston to compress the sealing sleeve along the axial direction of the sealing sleeve when the expansion agent expands, so that the sealing sleeve arches in the radial direction;

[0008] The secondary pushing piston is arranged in the medicine filling groove, and the secondary pushing piston and the primary pushing piston are respectively located on both sides of the expansion medicine, and the expansion medicine is sealed in the medicine filling groove, so that after the fluid is introduced into the injection port, the secondary pushing piston is pushed to compress the expansion medicine in the expanded state, thereby indirectly pushing the primary pushing piston to further compress the sealing sleeve.

[0009] In some embodiments, the primary ejection piston and / or the secondary ejection piston are annular members sleeved on the pipe column.

[0010] In some embodiments, a secondary shear pin is connected between the secondary ejection piston and the tubular column.

[0011] In some embodiments, the high-pressure packer further comprises an anchoring assembly, which is disposed at both ends of the sealing sleeve so as to synchronously radially arch and anchor to the isolation object when the sealing sleeve is compressed, thereby limiting the axial swing of the sealing sleeve.

[0012] In some embodiments, the anchor assembly includes: an outer support and an inner support;

[0013] The outer support is connected to the tubular column, the inner support is connected to the end of the sealing sleeve, and the inner support is embedded in the outer support so that when the sealing sleeve is subjected to axial pressure, the inner support is pushed into the outer support to compress the outer support to expand radially, thereby anchoring it to the isolation object.

[0014] 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.

[0015] In some embodiments, anchoring particles are disposed on the outer peripheral surface of the outer support member.

[0016] In some embodiments, protective rings are respectively sleeved on both ends of the sealing sleeve to maintain the cylindrical state of the two ends of the sealing sleeve when subjected to axial pressure.

[0017] In some embodiments, the high pressure packer further comprises: a restraining sleeve and an unlocking piston;

[0018] The constraint sleeve is sleeved on the pipe string, and the unlocking piston is slidably sleeved on the pipe string and is arranged between the constraint sleeve and the pipe string;

[0019] The sealing sleeve is sleeved on the unlocking piston, and one end of the sealing sleeve away from the primary ejection piston abuts against the restraining sleeve.

[0020] In some embodiments, an unlocking shear pin is connected between the unlocking piston and the pipe column.

[0021] The embodiments of the present application have at least the following beneficial effects:

[0022] The high-pressure seal provided in the embodiment of the present application forms an annular seal filling groove by nesting a tubing and a seal sleeve to store an expansion seal, so as to push a first-level push piston embedded in the seal filling groove, thereby compressing a sealing sleeve sleeved on the tubing, causing it to expand radially and contact and seal the object to be sealed, so as to realize a normal sealing function; a second-level push piston is further arranged in the seal filling groove, and is arranged on both sides of the expansion seal with the first-level push piston, and an injection hole is opened at the bottom of the seal filling groove, so as to push the second-level push piston to compress the expanded seal by injecting high-pressure fluid, and indirectly push the first-level push piston, thereby further compressing the sealing sleeve, increasing the degree of radial expansion, and increasing the contact pressure with the sealing object, thereby further enhancing the sealing strength and stability, so as to realize a second-level sealing, improve the adaptability to radial steam injection pressure fluctuations and the stability of the sealing seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic structural diagram of a high pressure packer in an embodiment of the present application is shown;

[0025] Figure 2 Shows Figure 1 A schematic diagram of the structure of the outer support member of the high pressure packer;

[0026] Figure 3 Shows Figure 2 A cross-sectional view of

[0027] Figure 4 Shows Figure 1 Schematic diagram of the structure of the sealing sleeve of the high-pressure packer.

[0028] Reference numerals:

[0029] 100-pipe column, 110-medicine sleeve, 111-medicine filling tank, 112-liquid injection port;

[0030] 200-constraint sleeve, 210-first cylinder, 220-second cylinder;

[0031] 300 - unlocking piston, 310 - first push-top surface, 311 - first unlocking gap, 320 - second push-top surface, 321 - second unlocking gap, 330 - unlocking shear pin;

[0032] 400-sealing sleeve, 410-fiber hot-hanging fluororubber, 420-polytetrafluoroethylene;

[0033] 500-protection ring;

[0034] 600-anchor assembly, 610-external support member, 611-thrust surface, 612-notch, 620-anchor member, 630-internal support member;

[0035] 700-first-stage push-up piston, 710-first-stage shear pin;

[0036] 800-secondary push piston, 810-secondary shear pin;

[0037] 900 - Swelling agent. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0040] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0041] During steam injection and production of heavy oil wells, a packer nipple is connected to the steam pipe string to isolate the external casing. The packer nipple is mainly composed of a pipe string, a sealing sleeve and a push piston sleeved on the pipe string, and a reagent filling groove and an expansion reagent are arranged on the outside of the pipe string to push the push piston to compress the sealing sleeve, forcing its barrel to radially arch and contact the inner wall of the external casing to achieve isolation and sealing.

[0042] However, once the expansion agent is stimulated to expand, it will maintain a certain volume, so that the radial expansion degree of the push piston will also be in a stable state, and the sealing strength will not increase; when the downhole working conditions change and the steam injection pressure fluctuates and exceeds the pressure limit, the risk of sealing failure increases sharply, which is not conducive to safe production.

[0043] To this end, the present application provides a high-pressure packer, which aims to improve the ability of the high-pressure packer to adapt to fluctuations in steam injection pressure to a certain extent, so as to maintain the reliability and stability of the setting.

[0044] Figure 1 The schematic diagram of the structure of the high pressure packer in the embodiment of the present application is shown; Figure 1 In some embodiments, the high-pressure packer may include: a tubing string 100 , a sealing sleeve 400 , a primary push piston 700 , a medicine sleeve 110 , a secondary push piston 800 , and an expansion agent 900 .

[0045] Among them, the agent sleeve 110 is sleeved on the pipe column 100, and the end of the sealing sleeve 110 away from the sealing sleeve 110 is connected to the pipe column 100 to form an annular agent filling groove 111 between the agent sleeve 110 and the outer peripheral surface of the pipe column 100, and the expansion agent 900 is arranged in the agent filling groove 111, so that the expansion agent 900 can stimulate expansion in the agent filling groove 111 and output a driving force to the groove, forming a piston-like working structure as a power source for the sealing action of the packer.

[0046] The sealing sleeve 400 serves as a sealing member and is contact-sealed with the isolation object; the sealing sleeve 400 can be sleeved on the tubular column 100, one end of the sealing sleeve 400 can abut against the thrust portion on the tubular column 100, the first end of the first-stage pushing piston 700 abuts against the other end of the sealing sleeve 400, and the second end of the first-stage pushing piston 700 is embedded in the agent filling groove 111, so as to push the first-stage pushing piston 700 to compress the sealing sleeve 400 along the axial direction of the sealing sleeve 400 when the expansion agent 900 expands, so that the sealing sleeve 400 arches radially and abuts against the isolation object to achieve contact sealing.

[0047] Generally speaking, the expansion agent 900 can be stimulated by stability, so as to adapt to the process of steam injection and production and stably stimulate the sealing; and it 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 sealing strength of the sealing sleeve 400.

[0048] The secondary push piston 800 is arranged in the reagent filling groove 111, and the secondary push piston 800 and the primary push piston 700 are respectively arranged on both sides of the expansion agent 900, and the expansion agent 900 is sealed in the reagent filling groove 111, so that after the expansion agent 900 expands, it can push the push piston 700 and the secondary push piston 800 respectively; and a liquid injection port 112 can be opened at the bottom of the reagent filling groove 111, so that the secondary push piston 800 can be pushed after the fluid is introduced into the liquid injection port 112, thereby compressing the expansion agent 900 in the expanded state, indirectly pushing the primary push piston 700 to further compress the sealing sleeve 400, so as to increase the radial expansion degree and contact sealing pressure of the sealing sleeve 400, improve the sealing reliability and pressure resistance performance, adapt to the pressure fluctuation of the injection and production steam, increase the pressure resistance capacity, and maintain the sealing reliability when the downhole working conditions change and the steam injection and production pressure increases significantly.

[0049] In some embodiments, the injection port 112 can be connected to the lumen of the tubular column 100 and the lower part of the groove cavity of the reagent filling groove 111, so that the steam flowing through the lumen of the tubular column 100 is used as the power source of the secondary sealing, pushing the secondary push piston 800 to move; thereby, when the injection and production steam pressure increases by a certain amplitude, it can adaptively move under the push, realize adaptive secondary sealing, enhance the pressure resistance and adaptability to fluctuations in the injection and production conditions, and improve the sealing performance.

[0050] In some embodiments, the injection port 112 can also be connected to other hydraulic sources or air pressure sources as an independent driving system. When a substantial increase in downhole injection steam pressure is detected, the hydraulic source or air pressure source is triggered to push the secondary push piston 800 to compress and expand the expansion agent 900.

[0051] In some embodiments, an independent air pressure detection component and a controller unit may also be provided. The air pressure detection component may be connected to the controller unit to monitor the air pressure of the injected steam in real time. The control unit controls the hydraulic source or the air pressure source based on the air pressure information to push the secondary push piston 800 to compress the expansion agent in the expansion state.

[0052] In some embodiments, a secondary shear pin 810 may be connected between the secondary pushing piston 800 and the tubing string 100. When the steam pressure in the tubing string 100 increases to a certain level, the secondary pushing piston 800 is forced to shear off the secondary pushing piston 800 to maintain the primary sealing action of the primary pushing piston 700 under normal conditions. When the steam pressure increases to a certain extent, the secondary pushing piston 800 is triggered to act to achieve secondary sealing.

[0053] In some embodiments, the primary ejection piston 700 and / or the secondary ejection piston 800 may be configured as an annular member, which is sleeved on the pipe string 100 to achieve uniform and stable force and implement a stable ejection action.

[0054] A seal or sealing structure may also be provided between the primary push piston 700 and the secondary push piston 800 and the outer peripheral surface of the tubular column 100 and the inner wall surface of the agent sleeve 110 to maintain the sealing performance of the expansion space of the expansion agent 900, thereby maintaining the stability and reliability of the setting operation.

[0055] In some embodiments, a steam injection pipe column is connected to the upstream and downstream of the short section of the isolation device, and there are disturbances in the upstream and downstream equipment, which causes the sealing sleeve to swing up and down, creep, and other posture changes that affect the contact sealing state; for this reason, the high-pressure isolation device also includes an anchoring assembly 600, and the anchoring assembly 600 is arranged at both ends of the sealing sleeve 400, so that when the sealing sleeve 400 is compressed, it can synchronously radially arch and anchor to the isolation object, thereby limiting the axial swing and creep of the sealing sleeve 400 as a limit stop.

[0056] Figure 2 Shows Figure 1 A schematic diagram of the structure of the outer support member of the high pressure packer; Figure 3 Shows Figure 2 Sectional view in .

[0057] See also Figure 1 , Figure 2 and Figure 3 In some embodiments, the anchoring assembly 600 may include an outer support member 610 and an inner support member 630 that are nested with each other; the outer support member 610 is connected to the tubular column 100, and the inner support member 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 member 630 is pushed into the outer support member 610 to compress the outer support member 610 to expand radially, thereby being anchored to the isolation object.

[0058] It is worth noting that the outer support member 610 can be made of an elastically deformable material, such as a rubber member.

[0059] 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 to a certain extent and reduce the creep of the string. The outer support can also be made of soft metal slips, which can improve the smoothness of unblocking, be easy to mill, and not easily cause well jamming accidents.

[0060] In some embodiments, in order to improve the deformation uniformity and stability of the outer support member 610, a push 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 inclined surface 611 to facilitate uniform push deformation.

[0061] In some embodiments, in order to further strengthen the anchoring degree and increase the contact friction, an anchor 620 such as anchor particles can be provided on the outer peripheral surface of the outer support member 610 , which can specifically be alloy particles embedded in the outer peripheral surface of the outer support member 610 .

[0062] In some embodiments, the inner support member 630 may be a main body member that can stably withstand and transmit the pushing pressure.

[0063] Correspondingly, the contact surface between the inner support member 630 and the pushed surface 611 can be set as a matching inclined surface, so that when the two are close to each other, they can be pushed up stably through surface contact, thereby maintaining the uniformity of the radial expansion and arch of the outer support member 610 and improving the anchoring strength.

[0064] In some embodiments, the outer support member 610 and the inner support member 630 may be configured as rings, which are sleeved on the pipe column 100 , so as to achieve stable installation.

[0065] In some embodiments, considering that the expansion of the end of the annular outer support member 610 will stretch the port area to a certain extent, increase the risk of irregular tearing, and affect the reliability of anchoring; for this reason, a plurality of notches 612 can be set at the port portion of the outer support member 610 to increase the amount of absorbed tensile deformation during expansion and reduce excessive random tearing.

[0066] 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 concentrate on bearing the thrust. In order to improve the uniformity of the shape change and force of the annular end and reduce the risk of tearing and flanging, the two ends of the sealing sleeve 400 can be respectively connected 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 overall force can be borne, thereby suppressing the risk of flanging and tearing.

[0067] In some embodiments, the protection ring 500 may be a flexible metal ring.

[0068] In some embodiments, considering the stress on the end face of the sealing sleeve 400, in order to reduce uneven stress tearing, the protective ring 500 can be sleeved on the end circumference of the sealing sleeve 400 and can also cover the end face of the sealing sleeve 400 to withstand pressure as a whole.

[0069] In some embodiments, in order to reduce the movement of the primary ejection piston 700 before actuation due to external forces and affect the setting action, a primary shear pin 710 may be provided between the primary ejection piston 700 and the tubing string 100 to maintain the initial position.

[0070] In some embodiments, the deformation sealing reliability and life of the sealing sleeve 400 are related to the deformation amplitude. In order to make the sealing sleeve 400 within the designed deformation range, the sealing contact pressure requirements and service life requirements are taken into consideration; avoid excessive compression of the sealing sleeve 400, which affects the sealing reliability and service life.

[0071] To this end, a stop structure may be provided between the primary ejection piston 700 and the pipe column 100 , so that after the primary ejection piston 700 moves to a preset position, it is stopped to avoid further compression of the sealing sleeve 400 .

[0072] Of course, the stop structure should be a breakable stop structure, and the pressure for breaking through the stop structure can be comparable to the pressure of the secondary ejection piston 800 shearing off the secondary shear pin 810, so that only when the secondary ejection piston 800 is pushed, the primary ejection piston 700 can break through the stop structure and further compress the sealing sleeve 400.

[0073] In some embodiments, the stop structure can be set as a shear pin protruding from the pipe string 100, located on the pushing track of the first-stage pushing piston 700, so that when the first-stage pushing piston 700 is subjected to a thrust greater than the shearing pressure, the shear pin is sheared and the vehicle continues to move forward.

[0074] In other embodiments, the stop structure may also be a stop that is provided on the tubular column 100 and the push piston 700 and can engage with each other, and the engagement height of the stop may be experimentally set so as to forcibly break through the engagement state of the stop when the first-stage push piston 700 is subjected to a thrust exceeding a preset breakthrough pressure.

[0075] In some embodiments, when performing the unsealing operation, the contact sealing state can be forcibly destroyed by lifting the tubing string 100, and then the assembly state of the packer can be repaired.

[0076] In other embodiments, adaptive unlocking can be achieved through structural settings in conjunction with lifting operations to reduce damage to the packer.

[0077] Specifically, the high-pressure isolation device may include a restraining sleeve 200 and an unlocking piston 300; the restraining sleeve 200 is sleeved on the tubing string 100, and the unlocking piston 300 can be slidably sleeved on the tubing string 100 and arranged between the restraining sleeve 200 and the tubing string 100, and can slide along the axial direction of the tubing string 100.

[0078] The sealing sleeve 400 is sleeved on the unlocking piston 300, and one end of the sealing sleeve 400 away from the primary ejection piston 700 abuts against the restraining sleeve 200, thereby limiting the sealing sleeve 400 so that when subjected to the pressure of the primary ejection piston 700, the sealing sleeve 400 can respond efficiently and implement adaptive deformation.

[0079] Thus, when unsealing is performed, the tubing string 100 can be pulled. At this time, the sealing sleeve 400 is affected by the contact resistance between the tubing string 100 and the isolation object, and will not move synchronously and at the same amplitude immediately. Therefore, the unsealing piston 300 and the sealing sleeve 400 move together along the axial direction of the tubing string 100 relative to the tubing string 100 to move away from the restraining sleeve 200, thereby leaving a gap at the end of the sealing sleeve 400 or between the anchor assembly 600 and the restraining sleeve 200, so that the axial deformation of the sealing sleeve 400 and the anchor assembly 600 of the tubing string 100 can be reduced or even restored, thereby greatly reducing the contact pressure and contact resistance between the tubing string 100 and the isolation object, so that the packer can be removed relatively conveniently and the degree of damage can be kept low.

[0080] In some embodiments, in order to prevent the movement of the unlocking piston 300 from affecting the setting stability of the sealing sleeve 400 , an unlocking shear pin 330 may be connected between the unlocking piston 300 and the pipe string 100 .

[0081] Thus, under normal conditions, the unlocking piston 300 is locked on the pipe string 100 under the action of the unlocking shear pin 330, and accordingly, the sealing sleeve 400 will not be driven to move; when unsealing, the pipe string 100 is actively extracted, and the sealing resistance forces the unlocking piston 300 to shear the unlocking shear pin 330, thereby realizing the switching between the two working states.

[0082] In some embodiments, taking into account the efficiency of applying force to lift the tubular column 100 for unsealing, a matching stop and push-up structure may be provided between the restraining sleeve 200 and the unsealing piston 300, so that during the lifting process, the unlocking piston 300 abuts against the restraining sleeve 200, thereby 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 casing.

[0083] In some embodiments, a first push-top surface 310 can be provided on the unlocking piston 300, leaving a certain movable gap between the first push-top surface 310 and the internal stopper of the restraining sleeve 200, i.e., a first unlocking gap 311, so as to meet the space requirement for relative movement of the unlocking piston 300, the tubular column 100 and the restraining sleeve 200, while taking into account the formation of the deformation reset space of the sealing sleeve 400.

[0084] In some embodiments, the constraint sleeve 200 can 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 string 100 , and the second cylinder 220 serves as a stopper for the sealing sleeve 400 and the anchor assembly 600 .

[0085] At the same time, the unsealing piston 300 may also be provided with a second push-up surface 320 , and a second unlocking gap 321 is correspondingly provided between the second cylinder 220 and the unsealing piston 300 .

[0086] An extension ring may be provided at the end of the second cylinder 220 to radially constrain the unsealing piston 300 and maintain a stable radial posture and position. The extension ring may also be used as a stopper for the second push-top surface 320 .

[0087] Correspondingly, the other end of the second cylinder 220 can also be embedded in the first cylinder 210 to serve as a stopper for the first push-up surface 310 .

[0088] On the other hand, the design of the divided cylinder body can reduce the difficulty of installing the constraint sleeve 200 and the unsealing piston 300 to a certain extent.

[0089] See also Figure 4 In some embodiments, the sealing sleeve 400 may be composited with fiber heat-hung fluororubber 410 and polytetrafluoroethylene 420, and may be stacked and combined in an alternating manner to obtain good temperature resistance and supporting capacity.

[0090] The embodiments of the present application have at least the following beneficial effects:

[0091] The high-pressure seal provided in the embodiment of the present application forms an annular seal filling groove by nesting a tubing and a seal sleeve to store an expansion seal, so as to push a first-level push piston embedded in the seal filling groove, thereby compressing a sealing sleeve sleeved on the tubing, causing it to expand radially and contact and seal the object to be sealed, so as to realize a normal sealing function; a second-level push piston is further arranged in the seal filling groove, and is arranged on both sides of the expansion seal with the first-level push piston, and an injection hole is opened at the bottom of the seal filling groove, so as to push the second-level push piston to compress the expanded seal by injecting high-pressure fluid, and indirectly push the first-level push piston, thereby further compressing the sealing sleeve, increasing the degree of radial expansion, and increasing the contact pressure with the sealing object, thereby further enhancing the sealing strength and stability, so as to realize a second-level sealing, improve the adaptability to radial steam injection pressure fluctuations and the stability of the sealing seal.

[0092] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0093] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0094] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0095] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; 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 elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0098] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0099] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A high pressure packer, characterized in that: include: Pipe string, sealing sleeve, primary push piston, reagent sleeve, secondary push piston and expansion reagent; The medicine sleeve is sleeved on the pipe column, and one end of the sealing sleeve away from the sealing sleeve is connected to the pipe column, and an annular medicine filling groove is formed between the medicine sleeve and the outer peripheral surface of the pipe column, the expansion medicine is arranged in the medicine filling groove, and a liquid injection port is opened at the bottom of the medicine filling groove; The sealing sleeve is sleeved on the pipe 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, so as to push the first-stage push piston to compress the sealing sleeve along the axial direction of the sealing sleeve when the expansion agent expands, so that the sealing sleeve arches in the radial direction; The secondary pushing piston is arranged in the medicine filling groove, and the secondary pushing piston and the primary pushing piston are respectively located on both sides of the expansion medicine, and the expansion medicine is sealed in the medicine filling groove, so that after the fluid is introduced into the injection port, the secondary pushing piston is pushed to compress the expansion medicine in the expansion state, thereby indirectly pushing the primary pushing piston to further compress the sealing sleeve.

2. The high pressure packer according to claim 1, characterized in that: The primary ejection piston and / or the secondary ejection piston are annular parts, which are sleeved on the pipe column.

3. The high pressure packer according to claim 1, characterized in that: A secondary shear pin is connected between the secondary ejection piston and the pipe column.

4. The high pressure packer according to claim 1, characterized in that: The high-pressure packer further comprises an anchoring assembly, which is arranged at both ends of the sealing sleeve so as to synchronously radially arch and anchor to the sealing object when the sealing sleeve is compressed, thereby limiting the axial swing of the sealing sleeve.

5. The high pressure packer according to claim 4, characterized in that: The anchor assembly comprises: an outer support member and an inner support member; The outer support is connected to the tubular column, the inner support is connected to the end of the sealing sleeve, and the inner support is embedded in the outer support so that when the sealing sleeve is subjected to axial pressure, the inner support is pushed into the outer support to compress the outer support to expand radially, thereby anchoring it to the isolation object.

6. The high pressure packer according to claim 5, characterized in that: A thrust inclined surface is arranged on the inner wall of the outer support member, and the inner support member abuts against the thrust inclined surface.

7. The high pressure packer according to claim 5, characterized in that: Anchoring particles are arranged on the outer peripheral surface of the outer support member.

8. The high pressure packer according to claim 1, characterized in that: The two ends of the sealing sleeve are respectively sleeved with protective rings to keep the two ends of the sealing sleeve in a cylindrical state when subjected to axial pressure.

9. The high pressure packer according to claim 1, characterized in that: The high pressure packer further comprises: a restraining sleeve and an unlocking piston; The constraint sleeve is sleeved on the pipe string, and the unlocking piston is slidably sleeved on the pipe string and is arranged between the constraint sleeve and the pipe string; The sealing sleeve is sleeved on the unlocking piston, and one end of the sealing sleeve away from the primary ejection piston abuts against the restraining sleeve.

10. The high pressure packer according to claim 9, characterized in that: An unlocking shearing pin is connected between the unlocking piston and the pipe column.

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