High-temperature and high-pressure resistant packer for oil field

Abstract

The application discloses a high-temperature and high-pressure resistant packer for oil field, and relates to the technical field of packers, which comprises a packer body, a mounting ring is arranged on the packer body, a mounting groove is arranged on the upper side of the mounting ring, the mounting groove is arranged on the packer body, a slip is arranged on the outer side of the mounting groove, the lower end of the slip is in abutment with the mounting ring, and the slip is installed on the packer body through a quick-release assembly. The mounting ring on the packer body provides a bottom supporting surface for the slip, so that the lower end of the slip is in abutment to form an initial bearing base; meanwhile, the mounting groove on the packer body provides lateral limiting for the slip, and radial deviation of the slip is avoided. Through the design of the quick-release assembly, the structural limitation of traditional packer slip integration is broken, a foundation is laid for subsequent quick replacement of the slip, and the problem that the existing packer slip is inconvenient to replace is solved.

Description

Technical Field

[0001] This invention relates to the field of packer technology, specifically to a high-temperature and high-pressure packer for deep oilfield applications. Background Technology

[0002] In oil and gas extraction, packers are needed to achieve layered isolation and seal the annular space between the tubing and casing or open hole wellbore in the high temperature and high pressure environment of deep wells. Packers have the characteristics of high temperature resistance, high pressure sealing and good anchoring ability. When the packer is lowered into the well to the designed position with the tubing, the rubber sleeve is bulged and deformed by hydraulic and mechanical means, thereby sealing the annular space between the tubing and casing and achieving layered isolation.

[0003] During use, the slips on the packer wear down over time, affecting its operation and requiring replacement. However, replacing the slips on existing packers is inconvenient. Summary of the Invention

[0004] This invention provides a high-temperature and high-pressure resistant packer for deep oilfield applications, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A high-temperature and high-pressure resistant packer for deep oilfield applications includes a packer body, an installation ring on the packer body, an installation groove on the upper side of the installation ring, the installation groove being disposed on the packer body, a slip on the outer side of the installation groove, the lower end of the slip abutting against the installation ring, and the slip being installed on the packer body via a quick-release assembly.

[0006] Preferably, the quick-release assembly includes a first quick-release assembly and a second quick-release assembly, wherein the first quick-release assembly is used to install the slip into the mounting groove, and the second quick-release assembly is used to install the slip into the mounting ring.

[0007] Preferably, the first quick-release assembly includes a first mounting plate and a second mounting plate. The first mounting plate is provided with mounting screw holes, and the first mounting plate is fixed to the mounting screw holes by bolt locking clips. The second mounting plate is fixedly connected to the mounting groove, and the first mounting plate and the second mounting plate are detachably connected.

[0008] Preferably, the second mounting plate is provided with limit blocks, and the first mounting plate is inserted into the gap between several limit blocks.

[0009] Preferably, a sliding block is provided on the first mounting plate, and a mounting rod is slidably connected to the sliding block; The second mounting plate is provided with a fixing block, and the fixing block has a mounting slot, and the mounting rod is slidably connected in the mounting slot.

[0010] Preferably, the mounting rod is provided with a necked section, the diameter of which is smaller than the diameter of the mounting rod excluding the necked section; The inner diameter of the mounting slot is adapted to the diameter of the mounting rod excluding the neck section; The mounting slot has an open groove on the surface of the fixing block, and the width of the open groove is adapted to the diameter of the necked section.

[0011] Preferably, a first spring is sleeved on the mounting rod, the first spring is disposed inside the first mounting plate, one end of the first spring is fixedly connected to the first mounting plate, and the other end of the first spring is fixedly connected to the mounting rod.

[0012] Preferably, a limit ring is provided on the mounting rod; The mounting rod is equipped with a handle.

[0013] Preferably, the second quick-release assembly includes a fixing tube and a fixing compartment, wherein the fixing tube is fixedly connected to the mounting ring and the fixing compartment is fixedly connected to the clip; A fixing rod is slidably connected inside the fixing tube. A fixing head is provided at the upper end of the fixing rod, and a locking block is provided on the fixing head. The fixed chamber is provided with a slot, and the slot is provided in correspondence with the fixed head; The slot is provided with a snap-fit ​​sliding groove, which is correspondingly provided with the slot block; The fixed chamber is provided with an insertion slot, and the fixed tube is partially inserted into the insertion slot; The fixed compartment is provided with a fixing groove, which is connected to the outside of the fixed compartment through a snap-fit ​​sliding groove. The inner diameter of the fixing groove is larger than the inner diameter of the positioning groove; The locking block is engaged in the fixing groove.

[0014] Preferably, a locking ring is provided on the fixed insertion rod, and a second spring is provided between the locking ring and the inner wall of the fixed tube. The second spring is sleeved on the fixed insertion rod, and the two ends of the second spring are respectively fixedly connected to the locking ring and the fixed tube. The lower end of the fixed tube is detachably connected to a sealing block.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The mounting ring on the packer body provides a bottom support surface for the slips, allowing the lower end of the slips to abut against and form an initial load-bearing foundation. Simultaneously, the mounting groove on the packer body provides lateral restraint for the slips, preventing radial displacement. Through the quick-release component design, the traditional integrated and fixed structure of packer slips is broken, laying the foundation for rapid slip replacement and solving the problem of inconvenient slip replacement in existing packers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the first quick-release component structure of the present invention; Figure 3 This is a cross-sectional view of the first quick-release component structure of the present invention; Figure 4 This is a schematic diagram of the second quick-release component structure of the present invention; Figure 5 This is a cross-sectional schematic diagram of the fixed tube structure of the present invention; Figure 6 This is a perspective view of the fixed chamber structure of the present invention.

[0017] In the diagram: 1. Packer body; 2. Slip; 3. Mounting ring; 4. Mounting groove; 5. First mounting plate; 6. Second mounting plate; 7. Mounting rod; 8. Handle; 9. Limiting block; 10. Fixing block; 11. Mounting slot hole; 12. Sliding block; 13. Mounting screw hole; 14. Limiting ring; 15. First spring; 16. Neck section; 17. Fixing tube; 18. Fixing insert rod; 19. Fixing head; 20. Locking block; 21. Fixing chamber; 22. Locking groove; 23. Locking slide groove; 24. Insertion placement groove; 25. Second spring; 26. Sealing block; 27. Locking ring; 28. Fixing groove. Detailed Implementation

[0018] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit the invention. They are merely used to distinguish protective components or operations described using the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0019] Example 1: Please refer to Figure 1 A high-temperature and high-pressure resistant packer for deep oilfield applications includes a packer body 1, an installation ring 3 on the packer body 1, an installation groove 4 on the upper side of the installation ring 3, the installation groove 4 being disposed on the packer body 1, a slip 2 on the outer side of the installation groove 4, the lower end of the slip 2 abutting against the installation ring 3, and the slip 2 being installed on the packer body 1 via a quick-release assembly.

[0020] The quick-release assembly includes a first quick-release assembly and a second quick-release assembly. The first quick-release assembly is used to install the slip 2 onto the mounting groove 4, and the second quick-release assembly is used to install the slip 2 onto the mounting ring 3.

[0021] The working principle and beneficial effects of the above scheme are as follows: The mounting ring 3 on the packer body 1 provides a bottom support surface for the slips 2, allowing the lower end of the slips 2 to abut and form an initial bearing base. Simultaneously, the mounting groove 4 on the packer body 1 provides lateral restraint for the slips 2, preventing radial displacement. The quick-release assembly consists of a first quick-release assembly and a second quick-release assembly. The first quick-release assembly securely connects the slips 2 to the mounting groove 4, limiting the axial movement of the slips 2. The second quick-release assembly locks the slips 2 to the mounting ring 3, strengthening the bottom fixation of the slips 2. Together, they ensure reliable assembly of the slips 2 onto the packer body 1. After the packer is lowered into the deep well, the slips 2 anchor to the inner wall of the casing under hydraulic or mechanical force, working with the rubber sleeve to achieve sealing of the annular space.

[0022] By adopting a detachable quick-release component design, the traditional packer slips are fixed in an integrated manner, breaking the structural limitations of traditional packer slips. This lays the foundation for quick slip replacement and solves the problem of inconvenient slip replacement in existing packers. The quick-release components fix the slips from the side (mounting groove) and the bottom (mounting ring), avoiding failure of a single fixing point under high temperature and pressure. This adapts to the complex working conditions of deep wells (high temperature can easily cause material deformation, and high pressure can easily cause structural loosening). The overall structure does not change the core packer function and is compatible with the existing deep well mining drive methods. It does not require major modifications to the mining equipment, thus reducing application costs.

[0023] Example 2: Please refer to Figure 2 , Figure 3 Based on Embodiment 1, the first quick-release assembly includes a first mounting plate 5 and a second mounting plate 6. The first mounting plate 5 is provided with mounting screw holes 13. The first mounting plate 5 is fixed to the mounting screw holes 13 by bolt locking clips 2. The second mounting plate 6 is fixedly connected to the mounting groove 4. The first mounting plate 5 and the second mounting plate 6 are detachably connected.

[0024] The second mounting plate 6 is provided with limiting blocks 9, and the first mounting plate 5 is inserted into the gap between several limiting blocks 9.

[0025] The first mounting plate 5 is provided with a sliding block 12, and a mounting rod 7 is slidably connected to the sliding block 12; The second mounting plate 6 is provided with a fixing block 10, and the fixing block 10 is provided with a mounting slot 11, and the mounting rod 7 is slidably connected in the mounting slot 11.

[0026] The mounting rod 7 is provided with a necked section 16, the diameter of which is smaller than the diameter of the mounting rod 7 excluding the necked section 16. The inner diameter of the mounting slot 11 is adapted to the diameter of the mounting rod 7 excluding the neck section 16; The mounting slot 11 has an open slot on the surface of the fixing block 10, and the width of the open slot is adapted to the diameter of the necked section 16.

[0027] A first spring 15 is sleeved on the mounting rod 7. The first spring 15 is disposed inside the first mounting plate 5. One end of the first spring 15 is fixedly connected to the first mounting plate 5, and the other end of the first spring 15 is fixedly connected to the mounting rod 7.

[0028] A limit ring 14 is provided on the mounting rod 7; A handle 8 is provided on the mounting rod 7.

[0029] The working principle and beneficial effects of the above scheme are as follows: By bolting through the pre-drilled holes in the slip 2 and locking it with the mounting screw holes 13 of the first mounting plate 5, the slip 2 and the first mounting plate 5 form a modular whole, facilitating overall assembly and disassembly. The second mounting plate 6 is fixed in the mounting groove 4, and the limiting block 9 on its surface forms a positioning gap. The first mounting plate 5 is inserted into this gap to quickly achieve lateral positioning of the slip 2 and avoid installation misalignment. The mounting rod 7 on the first mounting plate 5 achieves axial sliding through the sliding block 12. During assembly, pulling the handle 8 compresses the first spring 15, aligning the necked section 16 on the mounting rod 7 with the second mounting plate 5. Mounting plate 6 is fixed to the mounting slot 11 of block 10. The necked section 16 is placed in the mounting slot 11. After releasing the handle, the first spring 15 returns to its original position and pushes the mounting rod 7 into the mounting slot 11. Since the inner diameter of the mounting slot 11 matches the diameter of the non-necked section of the mounting rod 7, a tight fit is achieved. When disassembling, pull the handle 8 to compress the first spring 15 of the mounting rod 7. The mounting rod 7 moves until the necked section 16 is aligned with the open slot of the mounting slot 11 (the width of the open slot matches the diameter of the necked section). Then the first mounting plate 5 and the clip 2 can be removed from the gap of the limiting block 9. The limiting ring 14 on the mounting rod 7 prevents the mounting rod 7 from sliding excessively and detaching from the first mounting plate 5. The first spring 15 always provides axial preload to offset the gaps caused by the thermal expansion and contraction of materials under the high temperature of deep wells, ensuring locking reliability. There is no need to disassemble the packer as a whole; modular replacement of the slips can be achieved simply by pulling the handle, greatly shortening maintenance time and reducing the difficulty of deep well operations. The dual positioning structure of the limiting block and the mounting rod ensures the consistency of the slip installation position, avoiding the impact of installation deviation on the anchoring effect, and adapting to the high-precision packing requirements of deep wells. The preload design of the first spring can compensate for the material deformation gaps caused by high temperature. The tight fit between the mounting rod and the mounting slot can resist high pressure impact, avoid locking structure failure, and extend service life. All parts are detachable and can be replaced individually after damage, without scrapping the entire packer, reducing operating costs.

[0030] Example 3: Please refer to Figures 4-6 Based on Embodiment 1, the second quick-release assembly includes a fixing tube 17 and a fixing compartment 21. The fixing tube 17 is fixedly connected to the mounting ring 3, and the fixing compartment 21 is fixedly connected to the clip 2. A fixing rod 18 is slidably connected inside the fixing tube 17. A fixing head 19 is provided at the upper end of the fixing rod 18, and a locking block 20 is provided on the fixing head 19. The fixed compartment 21 is provided with a slot 22, which is correspondingly provided with the fixed head 19; The slot 22 is provided with a snap-fit ​​sliding groove 23, which is correspondingly provided with the slot block 20; The fixed compartment 21 is provided with an insertion slot 24, and the fixed tube 17 is partially inserted into the insertion slot 24; The fixed compartment 21 is provided with a fixed groove 28, and the fixed groove 28 is connected to the outside of the fixed compartment 21 through a snap-fit ​​sliding groove 23. The inner diameter of the fixing groove 28 is larger than the inner diameter of the positioning groove 22; The locking block 20 is engaged in the fixing groove 28.

[0031] A locking ring 27 is provided on the fixed insertion rod 18, and a second spring 25 is provided between the locking ring 27 and the inner wall of the fixed tube 17. The second spring 25 is sleeved on the fixed insertion rod 18, and the two ends of the second spring 25 are respectively fixedly connected to the locking ring 27 and the fixed tube 17. The lower end of the fixed tube 17 is detachably connected to a sealing block 26.

[0032] The working principle and beneficial effects of the above scheme are as follows: The second quick-release component's elastic locking and locking structure achieves a stable connection and quick assembly / disassembly between the clip and the mounting ring, forming a coordinated fixation with the first quick-release component. The fixing tube 17 is fixed to the mounting ring 3, and the fixing chamber 21 is fixed to the slip 2. During assembly, the fixing tube 17 is inserted into the insertion slot 24 of the fixing chamber 21 to achieve the initial positioning of the slip 2 and the mounting ring 3. The fixing rod 18 slides inside the fixing tube 17. The second spring 25 between the locking ring 27 at its lower end and the inner wall of the fixing tube 17 is always in a pre-compressed state, providing an upward elastic thrust to push the fixing head 19 at the upper end of the fixing rod 18 into the locking slot 22 of the fixing chamber 21. The locking block 20 on the fixing head 19 slides along the locking slide groove 23 to the fixing slot 28 (the inner diameter of the fixing slot 28 is larger than that of the locking slot 22, forming a stepped locking structure). When the fixing rod 18 is rotated, the locking slot 22 engages with the fixing slot 28, achieving irreversible locking (it cannot fall off without external force). During disassembly, rotate the fixing rod 18 to align the locking block 20 with the locking groove 23, pull the fixing rod 18 to compress the second spring 25, so that the locking groove 22 is disengaged from the fixing groove 28, and the locking block 20 slides out along the locking groove 23, so that the fixing tube 17 can be removed from the insertion placement groove 24, thus completing the separation of the clip and the mounting ring. The sealing block 26 at the lower end of the fixed pipe 17 can prevent mud and impurities in the deep well from entering the interior of the fixed pipe 17, avoid jamming of the second spring 25 and the fixed insertion rod 18, and ensure the long-term reliability of the elastic mechanism.

[0033] In conjunction with the first quick-release component, it forms lateral and bottom fixation. The stepped fit between the locking slot and the fixing slot, along with the elastic pre-tension of the second spring, can withstand the impact and vibration of high pressure in deep wells, ensuring that the slips do not loosen or fall off under extreme working conditions. Unlocking can be achieved simply by pulling and rotating, without the need for complicated tools. Combined with the modular design of the first quick-release component, the entire slip replacement process is efficient and quick, solving the problem of disassembling the entire structure required for traditional packer slip removal. The second spring is made of high-temperature resistant elastic material (suitable for high-temperature environments in deep wells). The sliding contact surface between the fixing rod and the fixing tube can withstand friction and wear under high pressure. The protective design of the sealing block avoids the influence of impurities and extends the service life of the component. The guiding design of the insertion and placement slot facilitates quick alignment of the fixing tube, and the elastic locking structure can compensate for minor deviations during installation, reducing on-site assembly difficulty and improving work efficiency.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-temperature and high-pressure resistant packer for deep oilfield applications, characterized in that, Includes a packer body (1), on which a mounting ring (3) is provided, and a mounting groove (4) is provided on the upper side of the mounting ring (3). The mounting groove (4) is provided on the packer body (1), and a slip (2) is provided on the outside of the mounting groove (4). The lower end of the slip (2) abuts against the mounting ring (3), and the slip (2) is installed on the packer body (1) by a quick-release assembly. The quick-release assembly includes a first quick-release assembly and a second quick-release assembly. The first quick-release assembly is used to install the slip (2) onto the mounting groove (4), and the second quick-release assembly is used to install the slip (2) onto the mounting ring (3). The first quick-release assembly includes a first mounting plate (5) and a second mounting plate (6). The first mounting plate (5) is provided with mounting screw holes (13). The first mounting plate (5) is fixed to the mounting screw holes (13) by bolt locking clips (2). The second mounting plate (6) is fixedly connected to the mounting groove (4). The first mounting plate (5) and the second mounting plate (6) are detachably connected. The second mounting plate (6) is provided with limit blocks (9), and the first mounting plate (5) is inserted into the gap between several limit blocks (9); A sliding block (12) is provided on the first mounting plate (5), and a mounting rod (7) is slidably connected to the sliding block (12); The second mounting plate (6) is provided with a fixing block (10), and the fixing block (10) is provided with a mounting slot (11), and the mounting rod (7) is slidably connected in the mounting slot (11); The second quick-release assembly includes a fixing tube (17) and a fixing compartment (21). The fixing tube (17) is fixedly connected to the mounting ring (3), and the fixing compartment (21) is fixedly connected to the slip (2). A fixing rod (18) is slidably connected inside the fixing tube (17). A fixing head (19) is provided at the upper end of the fixing rod (18), and a locking block (20) is provided on the fixing head (19). The fixed compartment (21) is provided with a slot (22), and the slot (22) is provided in correspondence with the fixed head (19); The slot (22) is provided with a snap-fit ​​sliding groove (23), and the snap-fit ​​sliding groove (23) is provided in correspondence with the slot block (20); The fixed compartment (21) is provided with a plug-in mounting groove (24), and the fixed tube (17) is partially plugged into the plug-in mounting groove (24); The fixed compartment (21) is provided with a fixed groove (28), and the fixed groove (28) is connected to the outside of the fixed compartment (21) through a snap-fit ​​sliding groove (23); The inner diameter of the fixing groove (28) is larger than the inner diameter of the positioning groove (22); The locking block (20) is engaged in the fixing groove (28).

2. The high-temperature and high-pressure resistant packer for deep-sea oilfields according to claim 1, characterized in that, The mounting rod (7) is provided with a necked section (16), the diameter of which is smaller than the diameter of the mounting rod (7) excluding the necked section (16). The inner diameter of the mounting slot (11) is adapted to the diameter of the mounting rod (7) excluding the necked section (16); The mounting slot (11) has an open slot on the surface of the fixing block (10), and the width of the open slot is adapted to the diameter of the necked section (16).

3. The high-temperature and high-pressure resistant packer for deep-sea oilfields according to claim 2, characterized in that, A first spring (15) is sleeved on the mounting rod (7). The first spring (15) is disposed inside the first mounting plate (5). One end of the first spring (15) is fixedly connected to the first mounting plate (5), and the other end of the first spring (15) is fixedly connected to the mounting rod (7).

4. A high-temperature and high-pressure resistant packer for deep oilfield applications according to claim 3, characterized in that, A limit ring (14) is provided on the mounting rod (7); A handle (8) is provided on the mounting rod (7).

5. A high-temperature and high-pressure resistant packer for deep-sea oilfields according to claim 1, characterized in that, A locking ring (27) is provided on the fixed insertion rod (18), and a second spring (25) is provided between the locking ring (27) and the inner wall of the fixed tube (17). The second spring (25) is sleeved on the fixed insertion rod (18), and the two ends of the second spring (25) are respectively fixedly connected to the locking ring (27) and the fixed tube (17). The lower end of the fixed tube (17) is detachably connected to a sealing block (26).

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