High temperature and high pressure self-balancing multi-stage casing packer

Abstract

The present invention belongs to the technical field of oil drilling equipment. The present invention provides a high-temperature and high-pressure self-balancing multi-stage isolation casing packer, which is used to work in the casing to isolate the casing, including: a tube body; a casing body, the casing body is slidably arranged outside the tube body; a plurality of slips, which can be radially slidably arranged on the casing body and are arranged in a plurality of circles. After sliding, they are used to abut against the inner wall of the casing for sealing, and the lower end has a third inclined surface; a pressure ring, the pressure ring is arranged between the third inclined surface and the tube body, and has a fourth inclined surface, the fourth inclined surface abuts against the third inclined surface, and the pressure ring is configured so that after the third inclined surface pushes the fourth inclined surface, the inner diameter of the pressure ring becomes larger, and after the third inclined surface stops pushing the fourth inclined surface, the pressure ring returns to its original shape. The above technical solution solves the technical problem that the slip sealing of the casing packer in the prior art is easily affected by the slip sealing in a high-temperature and high-pressure environment.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling equipment, and in particular relates to a high-temperature and high-pressure self-balancing multi-stage isolation casing packer. Background Art

[0002] Casing packers are important tools used to separate different downhole layers during oil and gas field completion and workover operations. Driven mechanically or hydraulically, the sealing rubber cylinder expands and squeezes the inner wall of the casing, forming an annular seal. This isolates the fluids between the layers, effectively preventing interlayer crossflow and ensuring the smooth progress of operations such as stratified production, stratified water injection, and fracturing. Their performance directly impacts oil and gas production efficiency, downhole safety, and increased recovery rates. As oil and gas field development expands toward more complex working conditions, higher requirements are placed on the sealing reliability, temperature and pressure resistance, and long-term stability of casing packers. Particularly in high-temperature and high-pressure environments, some casing packers can experience friction between the sealing slips and the inner wall of the casing, resulting in poor sealing effectiveness. In severe cases, the packer can even fall, impacting the continuity and safety of oil and gas field development operations. Summary of the Invention

[0003] To overcome the above defects, an embodiment of the present invention provides a high-temperature and high-pressure self-balancing multi-stage isolation casing packer, which solves the technical problem in the prior art that the slip seat seal of the casing packer is easily affected under high-temperature and high-pressure environments.

[0004] According to one aspect, at least one embodiment of the present invention provides a high-temperature, high-pressure, self-balancing, multi-stage isolation casing packer, which is used to operate in a casing to isolate the casing, comprising:

[0005] tube body;

[0006] a sleeve body, the sleeve body being slidably disposed outside the tube body;

[0007] Slips, the slips are multiple and can be radially slidably arranged on the sleeve body. The slips are arranged in a plurality of circles and are used to abut against the inner wall of the sleeve for sealing after sliding. The lower end of the slips has a third inclined surface.

[0008] a pressure ring, the pressure ring being arranged between the third inclined surface and the tube body and having a fourth inclined surface, the fourth inclined surface abutting against the third inclined surface, the pressure ring being configured such that when the third inclined surface pushes the fourth inclined surface, the inner diameter of the pressure ring increases, and when the third inclined surface stops pushing the fourth inclined surface, the pressure ring returns to its original shape;

[0009] In which, the cava and the pressure ring can be converted into an in-and-out well state and a seat sealing state. When in the seat sealing state, the cava abuts against the inner wall of the casing, and the third inclined surface pushes the fourth inclined surface to make the inner diameter of the pressure ring larger and away from the outer wall of the pipe body; when in the in-and-out well state, the cava is away from the inner wall of the casing, the third inclined surface cancels the pushing of the fourth inclined surface, and the inner diameter of the pressure ring becomes smaller and is pressed tightly against the outer wall of the pipe body.

[0010] For example, the high-temperature and high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure further includes:

[0011] a slip seat, the slip seat being slidably disposed outside the tube body and having a plurality of circumferentially arranged first inclined surfaces at its lower end, a second inclined surface at its upper end, the second inclined surface being in sliding contact with the first inclined surface, and the slip seat being used to push the slip to move via the first inclined surface and the second inclined surface after sliding;

[0012] The rubber cylinder has an upper rib, and the upper end of the cava seat has a lower rib. There are several rubber cylinders and they are arranged between the upper rib and the lower rib. The rubber cylinders are configured so that when the upper rib and the lower rib are close to each other, they can expand to seal the casing.

[0013] For example, the high-temperature and high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure further includes:

[0014] An elastic member, one end of which acts on the slips and the other end acts on the sleeve, providing a force for the slips to approach the pipe body so as to move away from the sleeve when the seal is cancelled.

[0015] For example, in the high-temperature and high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure, the inner wall of the pressure ring is cylindrical, the inner wall of the casing body has an annular accommodation space, and the pressure ring is located in the annular accommodation space;

[0016] The inner wall of the sleeve body further has an annular convex edge, and the annular convex edge is located in the annular accommodating space. The outer wall of the pressure ring has an annular groove, and the annular convex edge is arranged in the annular groove.

[0017] For example, in a high-temperature, high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure, the pressure ring has a plurality of circumferentially arranged first strip-shaped open grooves, the upper ends of the first strip-shaped open grooves passing through the upper end of the pressure ring, so as to divide the pressure ring into a plurality of upper pressure plates.

[0018] For example, in the high-temperature, high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure, the pressure ring also has a plurality of circumferentially arranged second strip-shaped open grooves, and the lower ends of the second strip-shaped open grooves pass through the lower end of the pressure ring, so as to separate the lower pressure plate from the two adjacent upper pressure plates.

[0019] For example, in the high-temperature and high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure, the lower end of the first strip-shaped open groove has a first stress hole, and the upper end of the second strip-shaped open groove has a second stress hole.

[0020] For example, in a high-temperature, high-pressure self-balancing multi-stage isolation casing isolation device provided by at least one embodiment of the present disclosure, the outer wall of the casing body has a guide column, and the casing body has a slide groove 1, a slide groove 2 and a connecting groove. The length of the slide groove 1 is longer than the length of the slide groove 2, and the upper end of the slide groove 1 and the upper end of the slide groove 2 are connected through the connecting groove. The guide column is used to be slidably set in the slide groove 1, the slide groove 2 and the connecting groove, and when in the well entry and exit state, the guide column is located in the slide groove 2, and when in the seat sealing state, the guide column is located in the slide groove 1.

[0021] For example, the high-temperature and high-pressure self-balancing multi-stage isolation casing packer provided in at least one embodiment of the present disclosure further includes:

[0022] Slip limiting bolts, the slip limiting bolts being arranged on the sleeve body;

[0023] A separator is sleeved outside the tube body and located between the rubber cylinder and the slip limit bolt. The separator has a limiting portion, which is located above the slip limit bolt and is used to abut against the slip limit bolt to limit the upward movement of the sleeve.

[0024] For example, at least one embodiment of the present disclosure provides a high-temperature, high-pressure self-balancing multi-stage isolation casing packer, wherein the partition has a guide space, the upper end of the cava limit bolt is slidably arranged in the guide space, and the limiting part is located at the upper part of the guide space.

[0025] The beneficial effects of the embodiments of the present invention are:

[0026] The present invention utilizes the sliding contact between the slip seat and the inclined surface of the slip, and the cooperation between the pressure ring and the inclined surface of the slip, to enable the slips and the pressure ring to switch between the two states of entry and exit and sealing. Under high temperature and high pressure environments, sufficient friction between the slips and the inner wall of the casing is ensured, improving the sealing effect, preventing the packer from falling, and ensuring the continuity and safety of oil and gas field development operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a casing packer in one embodiment of the present invention;

[0029] Figure 2 for Figure 1 Middle A is a schematic diagram of a partially enlarged structure;

[0030] Figure 3 for Figure 1 A schematic diagram of the top view of the casing packer in the embodiment of FIG.

[0031] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the middle BB;

[0032] Figure 5 for Figure 4 Middle D is a schematic diagram of the partially enlarged structure;

[0033] Figure 6 for Figure 4 Middle E is a schematic diagram of a partially enlarged structure;

[0034] Figure 7 for Figure 1 A top view of the casing packer in the embodiment;

[0035] Figure 8 for Figure 3 Schematic diagram of the cross-sectional structure of the CC;

[0036] Figure 9 for Figure 8 Middle F is a schematic diagram of a partially enlarged structure;

[0037] Figure 10 for Figure 1 A schematic side structural diagram of a casing packer in an embodiment of the present invention;

[0038] Figure 11 for Figure 10 Schematic diagram of the cross-sectional structure of GG;

[0039] In the figure: tube body - 100, upper rib - 101, guide column - 102, slip seat - 200, upper rib - 201, first inclined surface - 202, rubber cylinder - 300, sleeve - 400, annular accommodating space - 401, annular ridge - 402, slide groove 1 - 403, slide groove 2 - 404, connecting groove - 405, slip - 500, second inclined surface - 501, third inclined surface - 502, pressure ring - 600, fourth inclined surface - 601, annular groove - 602, first strip opening groove - 603, first stress hole - 6031, second strip opening groove - 604, second stress hole - 6041, elastic member - 700, slip limiting bolt - 800, separator - 900, limiting portion - 901, guide space - 902. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0041] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0042] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0045] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] like Figures 1 to 11 As shown, it shows a high-temperature and high-pressure self-balancing multi-stage isolation casing packer in one embodiment of the present invention, which is used to work in the casing to isolate the casing. The casing is the wellbore, and stable and efficient isolation is achieved through the coordinated operation of various components. Specifically, by utilizing the sliding abutment between the cava seat 200 and the inclined surface of the cava 500, and the cooperation between the pressure ring 600 and the inclined surface of the cava 500, the cava 500 and the pressure ring 600 can be switched between the two states of entering and exiting the well and sealing. In a high-temperature and high-pressure environment, it is ensured that the cava 500 has sufficient friction with the inner wall of the casing to improve the sealing effect, prevent the packer from falling, and ensure the continuity and safety of oil and gas field development operations. At the same time, the multi-stage sealing structure composed of the multi-stage rubber cylinder 300 enhances the sealing performance to adapt to complex downhole environments.

[0047] The tube body 100 is a hollow cylinder. The annular upper rib 101 is located near the upper end of the tube body 100 and can be integrally formed with the tube body 100 or installed separately. It is used to limit the upward movement of the rubber cartridge 300. The outer surface of the tube body 100 is treated with a wear-resistant treatment to enhance wear resistance when in contact with other components, reduce friction loss, and extend the service life of the tube body 100.

[0048] The slip seat 200 is cylindrical and fits over the tubular body 100, allowing it to slide axially along the tubular body 100. The annular lower rib 201 at the upper end, along with the upper rib 101 of the tubular body 100, compresses the rubber sleeve 300. A plurality of first inclined surfaces 202 are evenly arranged around the lower end, slidingly abutting against the second inclined surfaces 501 of the slips 500 to transmit the sealing force.

[0049] The inner surface of the slip seat 200 is provided with a friction-reducing coating to reduce the friction coefficient with the outer surface of the tube body 100. At the same time, a guide key is provided between the slip seat 200 and the tube body 100 to limit radial movement and ensure smooth axial sliding.

[0050] Multiple rubber sleeves 300 are spaced axially along the tubular body 100, forming a multi-stage sealing structure. These sleeves 300 are hollow cylindrical and made of a high-temperature and high-pressure-resistant rubber material, such as fluororubber. Their inner diameter matches the outer diameter of the tubular body 100, slightly smaller than the inner diameter of the casing. Compression by the upper and lower ribs 101 and 201 allows them to expand and conform to the inner wall of the casing. A metal frame is incorporated within the rubber sleeve 300 to enhance overall strength and prevent rupture or excessive deformation under high pressure, which could compromise the sealing effect.

[0051] The sleeve 400 is cylindrical and fits over the tubular body 100. It is slidable radially along the tubular body 100 and positioned below the first inclined surface 202 at the lower end of the slip seat 200. Its dimensions ensure free sliding around the tubular body 100 and provide space for the slips 500. The sleeve 400 is equipped with a number of circumferentially arranged radial grooves, the same number as the slips 500, with matching dimensions and a smooth inner surface to reduce sliding resistance.

[0052] A plurality of slips 500 are evenly arranged on the circumference of the casing body 400. The second inclined surface 501 at the upper end slides against the first inclined surface 202 at the lower end of the slip seat 200, and the third inclined surface 502 at the lower end cooperates with the fourth inclined surface 601 of the pressure ring 600. The third inclined surface 502 and the fourth inclined surface 601 can be either a plane or a conical surface, and can achieve relative sliding and push movement. The outer surface of the slip 500 is provided with a serrated structure to increase the friction with the inner wall of the casing. The slip 500 cooperates with the inclined surfaces of the slip seat 200 and the pressure ring 600 to achieve the transition between the well entry and exit and the sealing state. When in the well entry and exit state, the slip 500 is close to the pipe body 100 and away from the inner wall of the casing; when sealing, it slides radially outward and abuts against the inner wall of the casing to seal.

[0053] The pressure ring 600 is annularly arranged between the third inclined surface 502 and the pipe body 100, and the fourth inclined surface 601 is in close contact with the third inclined surface 502 of the slip 500. The pressure ring 600 can be designed to have a certain elastic deformation ability, and the inner diameter increases when the external force provided by the third inclined surface 502 acts on the fourth inclined surface 601, and returns to its original shape after the external force is removed, so that the inner diameter can change under the force, thereby ensuring that it can abut and press against the pipe body 100 without relative movement, so as to maintain synchronous movement.

[0054] During the entry and exit phase, preparations for lowering the packer are first performed. The packer is lowered to the desired downhole position using tubing and other tools. At this point, the slips 500 are positioned within the casing 400's chute, close to the tubular body 100 and away from the casing's inner wall, ensuring entry and exit. The compression ring 600, with its small inner diameter, compresses the outer wall of the tubular body 100, ensuring the stability of all components. The rubber sleeve 300 is not expanded, ensuring that all components are in their initial relative positions and securely connected.

[0055] During the sealing stage, an axial force is applied to the pipe body 100, causing the slip seat 200 to slide axially downward along the pipe body 100. The first inclined surface 202 at its lower end pushes the second inclined surface 501 of the slip 500, causing the slip 500 to slide radially outward.

[0056] As the slips 500 slide outward, their lower third sloped surface 502 pushes against the fourth sloped surface 601 of the pressure ring 600, increasing the inner diameter of the pressure ring 600 and moving it away from the outer wall of the tube body 100. Simultaneously, the serrations on the outer surface of the slips 500 make close contact with the inner wall of the casing, achieving a seated seal. As the slip seat 200 descends, the upper and lower ribs compress the rubber sleeve 300, causing it to expand and conform to the inner wall of the casing, forming a multi-stage seal to isolate the casing.

[0057] During the operational phase, such as during oil and gas extraction operations, the packer is in operation. The rubber sleeve 300, thanks to its inherent material and internal metal framework, withstands casing pressure and maintains a seal. The slips 500 maintain their position through friction with the inner wall of the casing and the interaction between the pressure ring 600 and the pipe body 100. The continuously enlarged inner diameter of the pressure ring 600 provides support for the slips 500, further ensuring the stability of the seal.

[0058] During the unsealing operation, a reverse axial force is applied to the tube body 100, the slip seat 200 slides upward, and its first inclined surface 202 is out of contact with the second inclined surface 501 of the slip 500. The slip 500 slides radially inward away from the inner wall of the sleeve, and the inner diameter of the pressure ring 600 becomes smaller and presses the outer wall of the tube body 100.

[0059] When the packer is taken out, the rubber cylinder 300 returns to its original state and is separated from the inner wall of the casing, thereby achieving unsealing. The packer can then be taken out from the well.

[0060] Through the coordinated bevels and state transition mechanisms between components, the slips 500 maintain sufficient and stable friction against the inner wall of the casing under high temperature and high pressure. The addition of the pressure ring 600, in particular, provides elastic support for the slips 500. Compared to traditional packers, this significantly improves seating stability, effectively preventing the packer from falling and ensuring operational continuity and safety. The multi-stage rubber cartridge 300 enables efficient sealing under high temperature and high pressure, improving sealing reliability and effectively preventing interlayer crossflow, thereby increasing oil and gas production efficiency and recovery rates. The structural design of each component can adapt to different casing and pipe sizes, as well as downhole pressure and temperature conditions, making it widely applicable to oil and gas field development operations under various complex working conditions.

[0061] In some examples, such as Figure 11 As shown, an elastic member 700 is added to optimize the position of the slips 500 when the packer is unseated. One end of the elastic member 700 is connected to the slips 500, and the other end acts on the casing 400, providing a force for the slips 500 to move closer to the tubular body 100. The elastic member 700 can be a tension spring. When the packer needs to be unseated, the elastic force provided by the elastic member 700 helps the slips 500 quickly and reliably move away from the inner wall of the casing, making the packer unseating process smoother and preventing the slips 500 from being difficult to reposition due to various complex downhole conditions, such as minor deformation and scaling. This further ensures the efficiency and safety of oil and gas field development operations.

[0062] During the in-and-out well stage, the elastic member 700 is in a naturally compressed state, providing a certain pre-tightening force for the slips 500, so that the slips 500 can be more stably maintained in a position close to the pipe body 100 and away from the inner wall of the casing, ensuring that during the lowering of the packer, the slips 500 will not be accidentally extended due to unexpected factors such as vibration and collision, thereby further ensuring the safety and stability of the well lowering process.

[0063] During the sealing phase, when an axial force is applied to the tubular body 100 through hydraulic or mechanical means, causing the slip seat 200 to slide axially downward along the tubular body 100, the first inclined surface 202 at the lower end of the slip seat 200 pushes against the second inclined surface 501 of the slip 500, causing the slip 500 to slide radially outward, overcoming the elastic force of the elastic member 700. As the slip 500 slides outward, the third inclined surface 502 at its lower end pushes against the fourth inclined surface 601 of the pressure ring 600, increasing the inner diameter of the pressure ring 600 and moving it away from the outer wall of the tubular body 100. Simultaneously, the serrations on the outer surface of the slip 500 come into close contact with the inner wall of the casing, achieving sealing. During this process, the elastic member 700 is further compressed, storing elastic potential energy.

[0064] During the working phase, such as oil and gas extraction, water injection, or fracturing, the packer is in operation. The elastic member 700 is continuously compressed, and its elastic force exerts an inward force on the slips 500. However, due to the friction between the slips 500 and the inner wall of the casing, and the interaction between the pressure ring 600 and the pipe body 100, the elastic member 700 can provide a force to tighten and prevent shaking. The slips 500 can be stably maintained in the sealing position, ensuring that the packer can operate reliably in high temperature and high pressure environments.

[0065] During the unsealing phase, when the packer needs to be unsealed, a reverse axial force is applied to the tubular body 100, causing the slip seat 200 to slide axially upward along the tubular body 100. The first inclined surface 202 of the slip seat 200 disengages from the second inclined surface 501 of the slip 500. At this point, the elastic member 700 releases its stored elastic potential energy, providing a rapid and stable force for the slip 500 to approach the tubular body 100, assisting the slip 500 in sliding radially inward and quickly away from the inner wall of the casing. Simultaneously, the fourth inclined surface 601 of the pressure ring 600 is no longer pushed by the third inclined surface 502, causing the inner diameter of the pressure ring 600 to decrease and re-press against the outer wall of the tubular body 100. Under the influence of its own elasticity and the pressure within the casing, the rubber sleeve 300 returns to its initial state, disengaging from the inner wall of the casing, achieving unsealing. The action of the elastic member 700 makes the unsealing process smoother, reduces the possibility of the slip 500 being difficult to reset due to complex downhole conditions, and improves the reliability and service life of the packer.

[0066] The setting of the elastic member 700 provides a reliable auxiliary force for the resetting of the slips 500. Compared with the packer without elastic members, the success rate of unsealing is improved under various complex downhole working conditions, effectively avoiding the problem of the packer being unable to be unsealed normally due to poor resetting of the slips, and ensuring the smooth progress of oil and gas field development operations.

[0067] Since the elastic member 700 can quickly and stably reset the slips 500, the unsealing time is shortened compared to the traditional method, which reduces the downhole operation time, improves the overall operation efficiency, and reduces the operation cost.

[0068] Optimized sealing stability: Under normal sealing conditions, the preload and compression of the elastic member 700 provide additional stability for the slips 500, making the contact between the slips 500 and the inner wall of the casing tighter and more stable, further improving the sealing effect and effectively preventing the risk of the packer loosening or falling due to slight vibrations or pressure fluctuations.

[0069] In some examples, such as Figure 6 As shown, the inner wall of the compression ring 600 is designed to be cylindrical, and an annular receiving space 401 is constructed on the inner wall of the casing 400 to accommodate the compression ring 600. The cylindrical inner wall of the compression ring 600 and the outer wall of the tubular body 100 provide a tighter and more stable fit, facilitating uniform pressure transmission under various operating conditions and thereby improving the stability of the set seal. The annular receiving space 401 provides positioning for the compression ring 600, ensuring its secure position during operation. This comprehensively enhances the overall reliability and adaptability of the packer, enabling it to better cope with complex downhole environments such as high temperature and high pressure.

[0070] The pressure ring 600 is annular as a whole, and its outer wall is adapted to the annular accommodating space 401 of the sleeve 400. The thickness of the pressure ring 600 is determined according to the actual stress conditions and structural strength requirements to ensure that it will not be excessively deformed when subjected to the pressure transmitted by the slip 500, thereby ensuring the stability and reliability of the inner diameter change.

[0071] The annular accommodation space 401 on the inner wall of the sleeve body 400 is a complete annular groove, thereby better accommodating the pressure ring 600 and providing the pressure ring 600 with a certain amount of movement space.

[0072] During the entry and exit stages, as the packer is lowered to the predetermined downhole position, the compression ring 600 is located within the annular accommodation space 401 of the casing 400, with its cylindrical inner wall maintaining a stable relative position to the outer wall of the tubular body 100. Due to the confinement of the compression ring 600 by the annular accommodation space 401 and the close contact between its inner wall and the outer wall of the tubular body 100, displacement or shaking of the tubular body 100 due to vibration, collision, and other factors during transportation and lowering is effectively avoided. This ensures the stability of the packer's various components in their initial state, laying a reliable foundation for subsequent setting operations.

[0073] The cylindrical structure of the inner wall of the pressure ring 600 fits tightly and evenly with the outer wall of the pipe body 100, and the annular accommodating space 401 of the sleeve 400 limits the pressure ring 600, making the force transmission during the sealing process more stable and uniform, greatly improving the sealing stability, and effectively reducing the risk of packer failure caused by unstable sealing, providing more reliable protection for the continuity and safety of oil and gas field development operations.

[0074] The matching structure of the pressure ring 600 and the sleeve body 400 reduces the wear and damage caused by factors such as shaking and uneven friction between components, significantly enhances the reliability of the structure, extends the service life of the packer, and reduces maintenance costs and operational risks.

[0075] The annular accommodation space 401 provides a stable accommodation space for the pressure ring 600 during the unsealing process, avoiding the unsealing difficulty caused by displacement or deformation of the pressure ring 600, optimizing the smoothness of unsealing, and further improving the overall performance and operating efficiency of the packer.

[0076] In some examples, such as Figure 6 As shown, an annular ridge 402 is provided on the inner wall of the casing 400 and is located within the annular accommodation space 401. An annular groove 602 is provided on the outer wall of the pressure ring 600, into which the annular ridge 402 is embedded. This enhances the connection stability and synergy between the pressure ring 600 and the casing 400. The movement of the pressure ring 600 within the annular accommodation space 401 is restricted, preventing circumferential rotation and axial movement, ensuring that its inner diameter changes along a predetermined trajectory, and improving the structural integrity, sealing performance, and setting reliability of the packer under complex downhole operating conditions.

[0077] The annular convex edge 402 of the sleeve body 400 surrounds the inner wall of the sleeve body 400 and is integrally formed with the sleeve body 400 in the annular accommodating space 401 to ensure structural strength and stability.

[0078] The annular groove 602 of the pressure ring 600 surrounds the outer wall of the pressure ring 600. Its size and shape correspond to the annular ridge 402. Its depth is sufficient to accommodate the annular ridge 402, ensuring that the inner diameter of the pressure ring 600 changes in a predetermined direction and preventing circumferential and axial displacement.

[0079] During the wellbore entry and exit phases, the annular ridge 402 engages the annular groove 602, further securing the compression ring 600 within the annular accommodation space 401. This prevents circumferential rotation and axial movement of the compression ring 600 even in the event of vibration or collision, ensuring the relative stability of all components and providing a more reliable foundation for sealing operations.

[0080] During the setting phase, when the slips 500 push the pressure ring 600, the annular ridge 402 cooperates with the annular groove 602 to define the motion trajectory of the pressure ring 600, allowing it to steadily change its inner diameter and evenly transmit pressure. This ensures more stable and reliable force transmission during the setting process, further improving the accuracy and stability of the setting process.

[0081] During operation, in the complex downhole environment of high temperature and pressure, the annular ridge 402 and the annular groove 602 closely mate, enhancing the connection stability between the pressure ring 600 and the casing 400. The pressure ring 600 can better maintain its position and shape, maintain close contact with the outer wall of the pipe body 100, ensure the sealing effect, and prevent interlayer crossflow.

[0082] During the unsealing stage, the annular ridge 402 and the annular groove 602 ensure that the pressure ring 600 moves accurately in the annular accommodation space 401, preventing abnormal displacement or jamming, making the unsealing operation smoother and improving the maintainability and reusability of the packer.

[0083] The annular ridge 402 and the annular groove 602 define the movement trajectory of the pressure ring 600. Compared with the packer without such a structure, the sealing accuracy and stability are further improved, and the risk of the packer failing due to sealing problems is reduced.

[0084] The matching structure significantly improves the connection stability between the pressure ring 600 and the sleeve 400, enhances the structural integrity under complex working conditions, reduces the risk of damage caused by component displacement or loosening, and improves the reliability and service life of the packer.

[0085] The annular ridge 402 and the annular groove 602 ensure that the movement trajectory of the pressure ring 600 is accurate during unsealing, thereby preventing abnormal situations, making unsealing smoother, improving the maintainability and reusability of the packer, and reducing maintenance costs and operational risks.

[0086] In some examples, such as Figure 7 As shown, by providing a plurality of circumferentially arranged first strip opening grooves 603 on the pressure ring 600, and allowing the upper ends of the first strip opening grooves 603 to pass through the upper end of the pressure ring 600, the pressure ring 600 is divided into a plurality of upper pressure plates. This improves the flexibility and adaptability of the inner diameter change of the pressure ring 600. When the cava 500 pushes the pressure ring 600, each upper pressure plate can deform relatively independently, responding more accurately to the force from the cava 500, thereby more effectively changing the inner diameter of the pressure ring 600 and enhancing the sealing effect. At the same time, this structure helps to disperse the pressure borne by the pressure ring 600, improve the structural stability and reliability of the pressure ring 600 in high temperature and high pressure environments, and further ensure the sealing performance and working efficiency of the isolation device in complex downhole working conditions.

[0087] The first strip-shaped open grooves 603 are evenly arranged along the circumference of the pressure ring 600, and their number is determined according to the size of the pressure ring 600 and actual working requirements. The distribution design can ensure that when the pressure ring 600 is subjected to force, the force exerted on each upper pressure plate is relatively balanced, thereby making the inner diameter change of the pressure ring 600 more uniform and stable.

[0088] When the pressure ring 600 is pushed by the slips 500, each upper pressure plate can undergo relatively independent radial deformation under the action of the first strip-shaped opening groove 603. Due to the presence of the first strip-shaped opening groove 603, there is a certain amount of space between the upper pressure plates, allowing them to be fine-tuned according to the actual force conditions, thereby more accurately adapting to the shape and pressure distribution of the outer wall of the tube body 100, achieving a tighter fit and enhancing the sealing effect. At the same time, under high temperature and high pressure environments, this coordinated deformation mechanism between the upper pressure plates can effectively disperse pressure, avoid stress concentration in a single location, and improve the structural stability and reliability of the pressure ring 600.

[0089] During the entry and exit phases, as the packer is lowered to its predetermined downhole position, the upper compression plates of the compression ring 600 maintain a relatively stable position, constrained by the first strip-shaped openings 603. Although there is some room for movement between the upper compression plates, the overall structural constraints and the coordination with the casing 400 prevent excessive deformation or displacement of the compression ring 600, ensuring the stability of the packer components during transportation and lowering, and preparing for subsequent setting operations.

[0090] During the sealing stage, when the cava seat 200 slides axially downward along the tube body 100, the cava 500 slides radially outward under the push of the cava seat 200 and pushes the pressure ring 600. At this time, under the action of the first strip-shaped opening groove 603, each upper pressure plate on the pressure ring 600 can respond relatively independently to the thrust of the cava 500 and deform radially according to the actual force conditions. This deformation method allows the inner diameter of the pressure ring 600 to change more accurately, achieving a tighter fit with the outer wall of the tube body 100, thereby enhancing the sealing effect. At the same time, the upper pressure plates work together to disperse the pressure borne by the pressure ring 600, improve the structural stability of the pressure ring 600 during the sealing process, and ensure the reliability of the sealing.

[0091] During the working phase, during operations such as oil and gas extraction, water injection or fracturing, the packer is in working condition. The high temperature and high pressure downhole environment will exert complex forces on the pressure ring 600. Since the pressure ring 600 is divided into several upper pressure plates, and a relatively flexible deformation mechanism is achieved through the first strip opening groove 603, each upper pressure plate can better adapt to this complex pressure environment. Under the action of pressure, the upper pressure plates can coordinately adjust the degree of deformation, effectively disperse the pressure, and avoid structural damage caused by stress concentration. This structure enables the pressure ring 600 to maintain a stable inner diameter change and good sealing performance during operation, continuously provide reliable support for the Cava 500, and ensure the smooth progress of oil and gas field development operations.

[0092] During the unsealing phase, when the packer needs to be unsealed, a reverse axial force is applied to the tubular body 100, causing the slip seat 200 to slide upward and the slips 500 to slide radially inward, reducing the inner diameter of the pressure ring 600. At this point, the elastically compressed upper pressure plate of the pressure ring 600, under the influence of the first strip-shaped opening groove 603, can relatively flexibly return to its initial position, making the unsealing process smoother. This avoids unsealing difficulties caused by excessive deformation or stress concentration of the pressure ring 600, thereby improving the maintainability and reusability of the packer.

[0093] The pressure ring 600 is divided into an upper pressure plate by the first strip-shaped opening groove 603, so that the pressure ring 600 can change the inner diameter more accurately when subjected to force, and achieve a tighter fit with the outer wall of the pipe body 100, thereby improving the safety and efficiency of oil and gas field development operations.

[0094] The effective distribution of pressure between the upper compression plates prevents stress concentration in a single location on the compression ring 600. This significantly improves the structural stability and reliability of the compression ring 600 under complex downhole conditions such as high temperature and high pressure. This enables the packer to operate stably and long-term in harsh environments, extending its service life and reducing maintenance costs and operational risks.

[0095] The first strip-shaped opening groove 603 enables the upper pressure plate of the pressure ring 600 to have relatively flexible deformation and recovery capabilities. During the unsealing process, the upper pressure plate can return to its initial position more smoothly, avoiding the problem of unsealing difficulties, improving the maintainability and reusability of the seal, and further enhancing the overall performance and economic benefits of the seal.

[0096] In some examples, such as Figure 7 As shown, on the basis of setting a first strip open groove 603 to divide the pressure ring 600 into several upper pressure plates, a plurality of circumferentially arranged second strip open grooves 604 are further set on the pressure ring 600, so that two adjacent upper pressure plates can be further divided into lower pressure plates. The structure of the pressure ring 600 is further refined, thereby improving the performance of the pressure ring 600. On the one hand, the addition of the lower pressure plate further enhances the flexibility and accuracy of the change in the inner diameter of the pressure ring 600, so that it can better adapt to the complex pressure distribution downhole and the outer wall conditions of the pipe body 100, and strengthen the pressing effect of the pressure ring 600 on the pipe body 100. On the other hand, the double strip open groove structure optimizes the stress distribution of the pressure ring 600, and the upper pressure plate and the lower pressure plate work together to further improve the structural stability and reliability of the pressure ring 600 under high temperature and high pressure environment, thereby ensuring the long-term stable operation of the packer.

[0097] The second strip-shaped opening slots 604 are also evenly spaced along the circumference of the pressure ring 600, and their number is the same as the first strip-shaped opening slots 603, ensuring that two adjacent upper pressing plates can separate the lower pressing plates. This layout design ensures that the pressure ring 600 is evenly stressed in the circumferential direction, and the lower pressing plates and upper pressing plates can maintain consistency when working together, thereby making the inner diameter change of the pressure ring 600 more stable and precise.

[0098] The width of the second strip-shaped opening slot 604 is the same as that of the first strip-shaped opening slot 603, ensuring the structural strength of the pressure ring 600 after segmentation while also providing the lower pressing plate with adequate space for movement and flexible deformation. The second strip-shaped opening slot 604 cooperates with the first strip-shaped opening slot 603 but does not penetrate it, ensuring that the upper and lower pressing plates can move relatively independently and work together.

[0099] During the sealing process, when the slips 500 push the pressure ring 600, the upper and lower pressure plates deform radially relatively independently. The gap formed by the strip-shaped opening grooves between the upper and lower pressure plates cooperates with each other to more accurately fit the shape of the outer wall of the tube body 100 and evenly distribute the pressure. For example, in areas with high local pressure, the upper and lower pressure plates at the corresponding positions can increase the degree of deformation to adapt to the pressure and avoid stress concentration. In high temperature and high pressure environments, this collaborative mechanism ensures the structural stability of the pressure ring 600 and maintains a good compression effect on the tube body 100.

[0100] During the packer lowering process, the presence of the first and second strip-shaped openings 603 and 604 ensures that the compression ring 600, despite being divided into multiple upper and lower compression plates, remains relatively stable as a whole. The mutual restraint between the upper and lower compression plates, as well as their coordination with the casing 400, prevents excessive deformation or displacement of the compression ring 600 due to vibration and collision during transportation and lowering, ensuring the stability of all components and preparing for the seal setting process.

[0101] The provision of the second strip-shaped opening groove 604 and the appearance of the lower pressure plate make the change of the inner diameter of the pressure ring 600 more flexible and precise, and can better adapt to complex downhole conditions. Compared with the structure with only the first strip-shaped opening groove, it has a good compression effect on the pipe body 100, further reducing the risk of sealing failure and improving the safety and efficiency of oil and gas field development operations. The upper and lower pressure plates work together to optimize the stress distribution of the pressure ring 600, significantly improving the structural stability and reliability of the pressure ring 600 under harsh working conditions such as high temperature and high pressure, extending the service life of the packer, and reducing maintenance costs and operational risks. The double strip-shaped opening grooves enable the upper and lower pressure plates to have better deformation and recovery capabilities, further improving the maintainability and reusability of the packer, and enhancing the overall performance and economic benefits of the packer.

[0102] In some examples, such as Figure 7 As shown, the lower end of the first strip-shaped open groove 603 has a first stress hole 6031, and the upper end of the second strip-shaped open groove 604 has a second stress hole 6041. This optimizes the stress distribution of the pressure ring 600 during operation and improves its structural performance. The stress holes can effectively release the concentrated stress generated by the pressure ring 600 during the deformation process, avoid structural damage caused by stress concentration, and enhance the durability of the pressure ring 600. At the same time, the provision of stress holes helps the upper and lower pressure plates to deform more flexibly when subjected to force, so that the pressure ring 600 can better adapt to the complex pressure environment downhole, further improving the sealing effect and the overall reliability of the packer.

[0103] In some examples, the outer wall of the tube body 100 has a guide column 102, and the sleeve 400 has a slide groove 1 403, a slide groove 2 404 and a connecting groove 405. The directions of the slide groove 1 403 and the slide groove 2 404 are both parallel to the axial direction of the tube body 100, the length of the slide groove 1 403 is longer than the length of the slide groove 2 404, the upper end of the slide groove 1 403 and the upper end of the slide groove 2 404 are connected by the connecting groove 405, and the guide column 102 is used to be slidably set in the slide groove 1 403, the slide groove 2 404 and the connecting groove 405, and when in the well entry and exit state, the guide column 102 is located in the slide groove 2 404, and when in the seat sealing state, the guide column 102 is located in the slide groove 1 403.

[0104] In some examples, such as Figure 1As shown, a guide system is constructed by installing a guide post 102 on the outer wall of the tubular body 100 and designing a first slide groove 403, a second slide groove 404, and a connecting groove 405 on the casing 400. This guide system guides the relative movement between the casing 400 and the tubular body 100 under different operating conditions of the packer, ensuring that all components accurately move along predetermined trajectories during well entry and exit and setting, further improving the stability and reliability of the packer's operation. By allowing the guide post 102 to move between different slide grooves, the well entry and exit state and the setting state are clearly distinguished, effectively avoiding problems such as seal failure or structural damage caused by movement deviation, and ensuring smooth oil and gas field development operations.

[0105] During the entry and exit phases, as the packer is lowered to the predetermined downhole position, the guide post 102 resides within the second chute 404. Due to the short length of the second chute 404, the movement of the casing 400 relative to the tubular body 100 is limited, allowing the various components of the packer to maintain a relatively stable position during transportation and lowering. Even in the event of vibration or collision, the restraining action of the guide post 102 within the second chute 404 prevents excessive movement of the casing 400, thereby ensuring that components such as the slips 500 and the pressure ring 600 are not damaged by abnormal movement of the casing 400 or that subsequent setting is not affected, thus providing a stable initial state for the setting operation.

[0106] Sealing stage. When an axial force is applied to the tube body 100 by hydraulic or mechanical means, causing the cava seat 200 to slide axially downward along the tube body 100, the sleeve body 400 will also move accordingly. At this time, the guide column 102 enters the slide groove 1 403 from the slide groove 2 404 through the connecting groove 405. Since the slide groove 1 403 is relatively long, it can meet the required moving distance of the sleeve body 400 relative to the tube body 100 during the sealing process. In the process of the guide column 102 sliding along the slide groove 1 403, the movement trajectory of the sleeve body 400 is accurately guided to ensure that the cava 500 can accurately contact the inner wall of the casing and achieve sealing. At the same time, the stable sliding of the guide column 102 in the slide groove 1 403 ensures that the pressure ring 600 and other components can work together in a predetermined manner, thereby enhancing the stability and reliability of the sealing.

[0107] In some examples, such as Figure 9As shown, additional slip limit bolts 800 and separators 900 are provided to optimize the structural stability and operational reliability of the packer. The slip limit bolts 800 are mounted on the casing 400, and the separator 900 is sleeved outside the tubular body 100 and positioned between the rubber sleeve 300 and the slip limit bolts 800. Its limiting portion 901 can abut against the slip limit bolts 800. This limits the upward movement of the casing 400, ensuring that the relative positions of the various components remain stable during the operation of the packer, and preventing abnormal operation of components such as the slips 500 and the rubber sleeve 300 due to excessive movement of the casing 400, thereby improving the overall performance of the packer and ensuring the smooth progress of oil and gas field production operations.

[0108] The slip limit bolts 800 are threadedly mounted on the sleeve 400 and are typically evenly distributed around the circumference of the sleeve 400. The number of slip limit bolts 800 is determined based on the size of the sleeve 400 and actual needs. This even distribution ensures that when the sleeve 400 is subjected to an upward force, the force is evenly applied at all positions, ensuring a consistent limiting effect.

[0109] The separator 900 is cylindrical in shape as a whole, and its inner diameter matches the outer diameter of the tube body 100 , and can be tightly fitted outside the tube body 100 .

[0110] The limiting portion 901 is provided at one end of the partition 900 close to the slip limiting bolt 800 and is an annular surface. The limiting portion 901 can abut against the head of the slip limiting bolt 800 to limit further movement of the sleeve 400.

[0111] During the sealing phase, when axial force is applied to the tubular body 100, causing the slip seat 200 to slide downward, the sleeve 400 moves downward, driving the slips 500 to seal the tubular body. During this process, the separator 900, mounted outside the tubular body 100, remains relatively stationary. After sealing is complete, if the sleeve 400 tends to move upward due to factors such as downhole pressure fluctuations, the stopper 901 of the separator 900 will abut against the slip stop bolt 800, preventing the sleeve 400 from moving upward. This ensures close contact between the slips 500 and the inner wall of the casing, maintaining the stability of the sealing state.

[0112] Through the cooperation of the slip limit bolt 800 and the separator 900, the upward movement of the sleeve 400 is effectively restricted, avoiding the failure of the slip 500 seal due to the displacement of the sleeve 400. Compared with the seal without this structure, the seal stability is significantly improved, reducing the risk of oil and gas leakage caused by unstable seal, and ensuring the safe implementation of oil and gas field mining operations.

[0113] The arrangement of the slip limit bolts 800 and the separator 900 makes the relative positions of the components of the packer more stable in a complex downhole environment, reduces the risk of structural damage caused by component displacement, improves the reliability of the overall structure of the packer, extends the service life of the packer, and reduces maintenance costs.

[0114] The slip limit bolts 800 and the separator 900 will not hinder the movement of the casing 400 during the unsealing process, ensuring smooth unsealing operation, improving the maintainability and reusability of the packer, and further enhancing the overall economic benefits of the packer.

[0115] In some examples, such as Figure 9 As shown, a guide space 902 is added so that the upper end of the slip limit bolt 800 can be slidably set therein, and the limiting part 901 is located at the upper part of the guide space 902. This can better realize the movement of the sleeve 400 and enhance the stability and reliability of the packer under different working conditions. The guide space 902 provides a guide for the slip limit bolt 800, ensuring that the slip limit bolt 800 and the separator 900 always maintain a good matching relationship during the axial movement of the sleeve 400. The setting of the limiting part 901 at the upper part of the guide space 902 makes the limiting effect more timely and reliable when the sleeve 400 moves upward, avoiding the excessive movement of the sleeve 400 to cause adverse effects on components such as the slip 500 and the rubber cylinder 300, further improving the overall performance of the packer, and ensuring the stable operation of oil and gas field mining.

[0116] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. High temperature and high pressure self-balancing multi-stage isolation casing packer, used to work in the casing to isolate the casing, characterized by: include: tube body(100); a sleeve (400), the sleeve (400) being slidably disposed outside the tube (100); Slips (500), the slips (500) are multiple and can be radially slidably arranged on the sleeve body (400), and are arranged in a plurality of circles. After sliding, they are used to abut against the inner wall of the sleeve for sealing, and the lower end has a third inclined surface (502); A pressure ring (600), the pressure ring (600) being arranged between the third inclined surface (502) and the tube body (100), and having a fourth inclined surface (601), the fourth inclined surface (601) being in contact with the third inclined surface (502), the pressure ring (600) being configured such that after the third inclined surface (502) pushes the fourth inclined surface (601), the inner diameter of the pressure ring (600) becomes larger, and after the third inclined surface (502) stops pushing the fourth inclined surface (601), the pressure ring (600) is restored; The slip (500) and the pressure ring (600) can be switched between an in-well state and a sealing state. When in the sealing state, the slip (500) abuts against the inner wall of the casing, and the third inclined surface (502) pushes the fourth inclined surface (601) so that the inner diameter of the pressure ring (600) becomes larger and moves away from the outer wall of the pipe body (100); when in the in-well state, the slip (500) moves away from the inner wall of the casing, and the third inclined surface (502) stops pushing the fourth inclined surface (601), and the inner diameter of the pressure ring (600) becomes smaller and is pressed against the outer wall of the pipe body (100).

2. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 1, characterized in that: Also includes: A slip seat (200), wherein the slip seat (200) is slidably arranged outside the tube body (100), and has a plurality of circumferentially arranged first inclined surfaces (202) at its lower end, and the slip seat (500) has a second inclined surface (501) at its upper end, and the second inclined surface (501) is in sliding contact with the first inclined surface (202), and after the slip seat (200) slides, it is used to push the slip seat (500) to move via the first inclined surface (202) and the second inclined surface (501); The rubber cylinder (300) comprises a tube body (100) having an upper rib (101), and an upper end of the cava seat (200) having a lower rib (201). The rubber cylinder (300) is in plurality and is arranged between the upper rib (101) and the lower rib (201), and is configured such that after the upper rib (101) and the lower rib (201) are brought close to each other, the rubber cylinder (300) can expand to seal the casing.

3. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 1, characterized in that: Also includes: An elastic member (700), one end of which acts on the slip (500) and the other end of which acts on the sleeve (400), provides a force for the slip (500) to approach the pipe body (100) so as to move away from the sleeve when the seat seal is canceled.

4. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 3, characterized in that: The inner wall of the pressure ring (600) is cylindrical, the inner wall of the sleeve (400) has an annular accommodating space (401), and the pressure ring (600) is located in the annular accommodating space (401); The inner wall of the sleeve (400) further comprises an annular ridge (402), and the annular ridge (402) is located in the annular accommodation space (401). The outer wall of the pressure ring (600) comprises an annular groove (602), and the annular ridge (402) is arranged in the annular groove (602).

5. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 3 or 4, characterized in that: The pressure ring (600) has a plurality of circumferentially arranged first strip-shaped opening grooves (603), the upper ends of the first strip-shaped opening grooves (603) passing through the upper end of the pressure ring (600), so as to divide the pressure ring (600) into a plurality of upper pressing sheets.

6. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 5, characterized in that: The pressure ring (600) further has a plurality of circumferentially arranged second strip-shaped opening grooves (604), the lower ends of the second strip-shaped opening grooves (604) passing through the lower end of the pressure ring (600), and are used to separate the lower pressing plates from the two adjacent upper pressing plates.

7. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 6, characterized in that: The lower end of the first strip-shaped opening slot (603) has a first stress hole (6031), and the upper end of the second strip-shaped opening slot (604) has a second stress hole (6041).

8. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 7, characterized in that: The outer wall of the tube body (100) has a guide column (102), and the sleeve body (400) has a slide groove 1 (403), a slide groove 2 (404) and a connecting groove (405). The length of the slide groove 1 (403) is longer than the length of the slide groove 2 (404). The upper end of the slide groove 1 (403) and the upper end of the slide groove 2 (404) are connected through the connecting groove (405). The guide column (102) is used to be slidably set in the slide groove 1 (403), the slide groove 2 (404) and the connecting groove (405). When in the well entry and exit state, the guide column (102) is located in the slide groove 2 (404), and when in the seat sealing state, the guide column (102) is located in the slide groove 1 (403).

9. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 2, characterized in that: Also includes: a slip limiting bolt (800), the slip limiting bolt (800) being arranged on the sleeve body (400); A separator (900) is sleeved outside the tube body (100) and is located between the rubber cylinder (300) and the slip limiting bolt (800). The separator (900) has a limiting portion (901), and the limiting portion (901) is located above the slip limiting bolt (800) and is used to abut against the slip limiting bolt (800), thereby limiting the upward movement of the sleeve body (400).

10. The high-temperature and high-pressure self-balancing multi-stage isolation casing packer according to claim 9, characterized in that: in, The partition (900) has a guide space (902), the upper end of the slip limiting bolt (800) is slidably disposed in the guide space (902), and the limiting portion (901) is located at the upper portion of the guide space (902).

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