Hydraulic expansion self-locking packer

Abstract

The application discloses a hydraulic expansion self-locking packer and relates to the technical field of packers, which comprises an inlet end, a packer sleeve is fixedly connected to the bottom of the inlet end, a packer fixing body is slidably connected to the inner wall of the packer sleeve, a placing groove is formed in the outer wall of the packer sleeve, a partition ring is fixedly connected to the inner wall of the placing groove, and a sealing mechanism is arranged on the outer wall of the packer sleeve. The sealing mechanism is arranged, the second inclined expansion sleeve and the first inclined expansion sleeve are deformed cooperatively, the expansion shape of the final cylindrical expansion sleeve after expansion is more uniform and stable, the packer sleeve continuously descends after the traditional cylindrical expansion sleeve is expanded, local stress concentration or uneven radial expansion and torsional deformation of the cylindrical expansion sleeve are effectively avoided, hidden troubles such as local bulging, tearing or sealing failure of the cylindrical expansion sleeve are avoided, and the problem that the material is accelerated to age due to the torsional heating of the cylindrical expansion sleeve is avoided.

Description

Technical Field

[0001] This invention relates to the field of packer technology, specifically to a hydraulically expanded self-locking packer. Background Technology

[0002] Packers are downhole tools that are attached to the downhole tubing string to seal the annular space between the tubing and the oil / gas well casing or open hole. The main types include expansion packers, compression packers, self-sealing packers, wedge packers, self-expanding packers, combined packers, and intelligent electric packers.

[0003] The patent application with publication number CN204646174U describes a hydraulically expandable self-locking steel frame packer, which specifically includes an upper connector, a lower connector, and a central tube connecting the upper and lower connectors. The central tube between the upper and lower connectors is fitted with a suspension sleeve, a connecting sleeve, a rubber sleeve assembly, and a floating head from top to bottom. The suspension sleeve is connected to the upper connector by a shear pin, and the suspension sleeve and the connecting sleeve are fixedly connected by an internal thread on the inner wall of the connecting sleeve.

[0004] In traditional oil and gas well packer operations, the cylindrical expansion sleeve is prone to local stress concentration, uneven expansion, and torsional deformation when it expands radially, leading to seal failure, bulging and tearing, or accelerated material aging. Specifically, when the packer sleeve continues to descend and squeeze the liquid to expand the cylindrical expansion sleeve, the traditional design, lacking a coordinated deformation structure, is prone to local over-expansion of the cylindrical expansion sleeve, large radial dimension differences, and torsional heating, affecting sealing stability and shortening equipment life. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a hydraulically expanded self-locking packer, thereby solving the aforementioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a hydraulic expansion self-locking packer, including an inlet end, a packer sleeve fixedly connected to the bottom of the inlet end, a packer fixing body slidably connected to the inner wall of the packer sleeve, a placement groove opened on the outer wall of the packer sleeve, a separator ring fixedly connected to the inner wall of the placement groove, and a sealing mechanism provided on the outer wall of the packer sleeve; The sealing mechanism includes: A cylindrical expansion sleeve, wherein the cylindrical expansion sleeve is an annular sealing sleeve structure, a first inclined expansion sleeve is fixedly connected to the top of the cylindrical expansion sleeve, and a second inclined expansion sleeve is fixedly connected to the bottom of the cylindrical expansion sleeve; The negative pressure groove is formed on the outer wall of the cylindrical expansion sleeve. The outer wall of the second inclined expansion sleeve is provided with a corrugated layer. The heat absorption plate is fixedly connected to the outer wall of the partition ring.

[0007] Preferably, a heat-absorbing plate is fixedly connected to the bottom of the heat-absorbing plate, and the heat-absorbing plate has a square strip structure.

[0008] Preferably, the heat absorption plate has a circular ring structure, and the first inclined expansion sleeve is internally connected to the cylindrical expansion sleeve and the second inclined expansion sleeve.

[0009] Preferably, the outer wall of the cylindrical expansion sleeve is provided with a negative pressure groove, the negative pressure groove is an annular groove, and a heat dissipation groove is provided between the heat absorption plate and the heat absorption disk.

[0010] Preferably, the heat dissipation groove is a rectangular groove, and the inner wall of the heat absorption plate is provided with an auxiliary mechanism, which includes a sliding bar, and the sliding bar is a square strip structure.

[0011] Preferably, the outer wall of the sliding strip is slidably connected to the inner wall of the heat absorption plate, and one end of the sliding strip is fixedly connected to a rotating shaft, which is a circular rod-shaped structure.

[0012] Preferably, a rotating sleeve is rotatably connected to the outer wall of the rotating shaft. The rotating sleeve has a circular sleeve structure. A heat-conducting plate is fixedly connected to the outer wall of the rotating sleeve, and a heat-conducting plate is fixedly connected to one end of the heat-conducting plate.

[0013] Preferably, the heat-conducting plate has a square plate-like structure, and a heat-conducting block is fixedly connected to the outer wall of the heat-conducting plate. The heat-conducting block has a long strip-like plate-like structure. The heat-conducting block extends axially and fits tightly against the inner wall of the heat dissipation groove.

[0014] This invention provides a hydraulically expanded self-locking packer. It has the following advantages: 1. By setting up a sealing mechanism, the second inclined expansion sleeve and the first inclined expansion sleeve are deformed in a coordinated manner to make the expansion shape of the final cylindrical expansion sleeve more uniform and stable after expansion. This effectively avoids the problem of the packer sleeve continuously descending after the expansion of the traditional cylindrical expansion sleeve, which can lead to local stress concentration, uneven radial expansion, and torsional deformation of the cylindrical expansion sleeve, resulting in hidden dangers such as local bulging, tearing, or sealing failure of the cylindrical expansion sleeve. It also avoids the problem of accelerated material aging caused by the torsional heating of the cylindrical expansion sleeve. 2. By setting a sealing mechanism, the air in the negative pressure groove forms a negative pressure air cushion, which sucks against the inner wall of the well barrel, further enhancing the tightness of the fit between the cylindrical expansion sleeve and the inner wall of the well barrel and the creep resistance. In addition, the negative pressure groove is opened on the outer wall of the cylindrical expansion sleeve, which further increases the shear and tensile strength of the cylindrical expansion sleeve and avoids the problem of circumferential tearing when the cylindrical expansion sleeve is subjected to axial force. 3. By setting up a sealing mechanism, the heat absorption plate absorbs the temperature and then releases it synchronously through the heat absorption plate and heat dissipation groove at the bottom, thereby reducing the problems of the cylindrical expansion sleeve itself and the liquid inside the cylindrical expansion sleeve. This effectively avoids the risks of rubber aging, sealing performance degradation and structural deformation caused by high temperature, and ensures that the packer can work stably for a long time under the high pressure and high temperature conditions of deep wells. 4. By setting up an auxiliary mechanism, the heat-conducting plate conducts heat to the first inclined expansion sleeve and the cylindrical expansion sleeve in real time through the heat-conducting block on the heat-conducting plate, and cools the temperature of the first inclined expansion sleeve and the cylindrical expansion sleeve in real time through the heat-conducting block on the heat-conducting plate, so as to ensure the material stability and deformation consistency of the cylindrical expansion sleeve and the first inclined expansion sleeve under high temperature and high pressure. 5. By setting an auxiliary mechanism, the sliding bar can naturally slide in the inner wall of the heat absorption plate as it is pushed, so as to achieve adaptive shape fit to the surface of the first inclined expansion sleeve. Thus, even when the cylindrical expansion sleeve is located in the well barrel and pressurized by water at different levels, the first inclined expansion sleeve can always maintain close contact with the heat conduction plate, ensuring that the heat conduction efficiency does not decrease due to deformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the sealing mechanism of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the sealing mechanism of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the sealing mechanism of the present invention. Figure 3 ; Figure 5 This is a cross-sectional structural diagram of the sealing mechanism of the present invention; Figure 6 This is a schematic diagram of the heat absorption plate of the present invention; Figure 7 For the present invention Figure 3 Enlarged view of point A; Figure 8 For the present invention Figure 6 Enlarged view of point B.

[0016] In the diagram: 1. Inlet end; 2. Packer sleeve; 3. Sealing mechanism; 301. Cylindrical expansion sleeve; 302. First inclined expansion sleeve; 303. Second inclined expansion sleeve; 304. Corrugated layer; 305. Negative pressure groove; 306. Heat absorption plate; 307. Heat absorption plate; 308. Heat dissipation groove; 4. Auxiliary mechanism; 401. Sliding bar; 402. Rotating shaft; 403. Rotating sleeve; 404. Connecting rod; 405. Heat-conducting plate; 406. Heat-conducting block; 5. Packer fixing body; 6. Separating ring; 7. Placement groove. Detailed Implementation

[0017] Example 1: Please refer to Figure 1-3 The present invention provides a technical solution: a hydraulic expansion self-locking packer, including an inlet end 1, a packer sleeve 2 fixedly connected to the bottom of the inlet end 1, a packer fixing body 5 slidably connected to the inner wall of the packer sleeve 2, a placement groove 7 opened on the outer wall of the packer sleeve 2, a separating ring 6 fixedly connected to the inner wall of the placement groove 7, and a sealing mechanism 3 provided on the outer wall of the packer sleeve 2. Sealing mechanism 3 includes: The cylindrical expansion sleeve 301 is an annular sealing sleeve structure. The top of the cylindrical expansion sleeve 301 is fixedly connected to the first inclined expansion sleeve 302, and the bottom of the cylindrical expansion sleeve 301 is fixedly connected to the second inclined expansion sleeve 303. The negative pressure groove 305 is formed on the outer wall of the cylindrical expansion sleeve 301. The outer wall of the second inclined expansion sleeve 303 is provided with a corrugated layer 304. The heat absorption plate 306 is fixedly connected to the outer wall of the partition ring 6.

[0018] During use, after the packer sleeve 2 is lowered into the predetermined position in the wellbore, it is locked inside the wellbore by the locking buckle of the packer fixing body 5, completing the sealing of the cylindrical expansion sleeve 301 to the inner wall of the wellbore. When the cylindrical expansion sleeve 301 expands, the inlet end 1 and the packer sleeve 2 continuously push down against the outer wall of the packer fixing body 5, injecting high-pressure liquid into the inner wall of the packer sleeve 2 to cause the annular sealing sleeve of the cylindrical expansion sleeve 301 to expand radially. At the same time, when the inlet end 1 and the packer sleeve 2 descend, they drive the cylindrical expansion sleeve 301 to expand and descend simultaneously. Therefore, the cylindrical expansion sleeve 301 will first expand and fit against the inner wall of the wellbore, and then the cylindrical expansion sleeve 301 will be unable to descend further. Meanwhile, the inlet end 1 and the packer sleeve 2 continue to descend. At this time, the second inclined expansion sleeve 303 in the contracted state is elongated by the expansion of the corrugated layer 304, and the packer... When the sleeve 2 and the separator ring 6 descend, they drive the heat absorption plate 306 and the first inclined expansion sleeve 302 to descend as well. This causes the first inclined expansion sleeve 302 to begin to contract. This allows the packer sleeve 2 to continue descending and squeezing liquid into the cylindrical expansion sleeve 301 for continuous expansion and sealing while the cylindrical expansion sleeve 301 is expanding and sealing. At the same time, the coordinated deformation of the second inclined expansion sleeve 303 and the first inclined expansion sleeve 302 makes the expansion shape of the cylindrical expansion sleeve 301 more uniform and stable after expansion. This effectively avoids the problem of local stress concentration, uneven radial expansion, and torsional deformation in the cylindrical expansion sleeve 301 after the packer sleeve 2 continues to descend after the expansion of the traditional cylindrical expansion sleeve 301. This can lead to hidden dangers such as local bulging, tearing, or sealing failure of the cylindrical expansion sleeve 301. It also avoids the problem of accelerated material aging caused by the torsional heating of the cylindrical expansion sleeve 301. Example 2: Please refer to Figure 1-6Based on Embodiment 1, the present invention provides a technical solution: a heat absorption plate 307 is fixedly connected to the bottom of the heat absorption plate 306, and the heat absorption plate 307 is a square strip structure.

[0019] The heat absorption plate 306 has a circular ring structure, and the first inclined expansion sleeve 302 is internally connected to the cylindrical expansion sleeve 301 and the second inclined expansion sleeve 303.

[0020] The outer wall of the cylindrical expansion sleeve 301 is provided with a negative pressure groove 305, which is an annular groove. A heat dissipation groove 308 is provided between the heat absorption plate 307 and the heat absorption disk 306.

[0021] After the cylindrical expansion sleeve 301 expands, the inner walls of the several negative pressure grooves 305 opened on the outer wall of the cylindrical expansion sleeve 301 can expand outward simultaneously, thereby squeezing and reducing the space of the original negative pressure grooves 305, so that the air in the negative pressure grooves 305 forms a negative pressure air cushion, which sucks the inner wall of the well barrel in the opposite direction, further enhancing the tightness of the fit between the cylindrical expansion sleeve 301 and the inner wall of the well barrel and the creep resistance. In addition, the negative pressure grooves 305 opened on the outer wall of the cylindrical expansion sleeve 301 further increase the shear and tensile strength of the cylindrical expansion sleeve 301, avoiding the problem of circumferential tearing of the cylindrical expansion sleeve 301 when subjected to axial force. After the cylindrical expansion sleeve 301 expands and seals the inner wall of the wellbore, the high temperature generated by the expansion and sealing of the cylindrical expansion sleeve 301 can be absorbed by the liquid inside the cylindrical expansion sleeve 301 and the heat absorption plate 306 through the connection with the heat absorption plate 306. After the heat absorption plate 306 absorbs the temperature, it is released synchronously through the heat absorption plate 307 at the bottom and the heat dissipation groove 308, thereby reducing the problems of the cylindrical expansion sleeve 301 itself and the liquid inside the cylindrical expansion sleeve 301, effectively avoiding the risk of rubber aging, sealing performance degradation and structural deformation caused by high temperature, and ensuring that the packer works stably for a long time under the high pressure and high temperature conditions of deep wells. Example 3: Please refer to Figure 1-8 Based on Embodiment 1 and Embodiment 2, the present invention provides a technical solution: the heat dissipation groove 308 is a rectangular groove, and the inner wall of the heat absorption plate 307 is provided with an auxiliary mechanism 4, which includes a sliding bar 401, and the sliding bar 401 is a square strip structure.

[0022] The outer wall of the sliding strip 401 is slidably connected to the inner wall of the heat absorption plate 307. One end of the sliding strip 401 is fixedly connected to a rotating shaft 402, which is a circular rod-shaped structure.

[0023] A rotating sleeve 403 is rotatably connected to the outer wall of the rotating shaft 402. The rotating sleeve 403 is a circular sleeve structure. A heat-conducting plate 405 is fixedly connected to the outer wall of the rotating sleeve 403. One end of the heat-conducting plate 405 is fixedly connected to the heat-conducting plate 405.

[0024] The heat-conducting plate 405 is a square plate structure, and a heat-conducting block 406 is fixedly connected to the outer wall of the heat-conducting plate 405. The heat-conducting block 406 is a long strip plate structure. The heat-conducting block 406 extends axially and fits tightly against the inner wall of the heat dissipation groove 308.

[0025] As the cylindrical expansion sleeve 301 expands, the first inclined expansion sleeve 302 shortens. The inclined surface of the first inclined expansion sleeve 302 and the inclined surface of the heat-conducting plate 405 will fit together adaptively through the hinge of the heat-conducting plate 405. The heat generated by the contraction of the first inclined expansion sleeve 302 and the cylindrical expansion sleeve 301 is conducted to the heat-conducting plate 405. The heat-conducting block 406 on the heat-conducting plate 405 completes the cooling of the temperature of the first inclined expansion sleeve 302 and the cylindrical expansion sleeve 301, so as to ensure the material stability and deformation consistency of the cylindrical expansion sleeve 301 and the first inclined expansion sleeve 302 under high temperature and high pressure. Meanwhile, the heat-conducting plate 405 is hinged to the sliding strip 401 via the connecting rod 404, the rotating sleeve 403, and the rotating shaft 402. The sliding strip 401 can slide naturally in the inner wall of the heat-absorbing plate 307 as it is pushed, so as to achieve adaptive shape fitting to the surface of the first inclined expansion sleeve 302. Thus, even when the cylindrical expansion sleeve 301 is located in the wellbore and pressurized by water to different degrees, the first inclined expansion sleeve 302 can always maintain close contact with the heat-conducting plate 405, ensuring that the heat transfer efficiency does not decrease due to deformation.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulically expandable self-locking packer, comprising an inlet end (1), a packer sleeve (2) fixedly connected to the bottom of the inlet end (1), a packer fixing body (5) slidably connected to the inner wall of the packer sleeve (2), a placement groove (7) formed on the outer wall of the packer sleeve (2), and a separator ring (6) fixedly connected to the inner wall of the placement groove (7), characterized in that: The outer wall of the packer sleeve (2) is provided with a sealing mechanism (3); The sealing mechanism (3) includes: A cylindrical expansion sleeve (301) is an annular sealing sleeve structure. A first inclined expansion sleeve (302) is fixedly connected to the top of the cylindrical expansion sleeve (301), and a second inclined expansion sleeve (303) is fixedly connected to the bottom of the cylindrical expansion sleeve (301). The negative pressure groove (305) is opened on the outer wall of the cylindrical expansion sleeve (301), the outer wall of the second inclined expansion sleeve (303) is provided with a corrugated layer (304), and the outer wall of the partition ring (6) is fixedly connected with a heat absorption plate (306).

2. The hydraulically expanded self-locking packer according to claim 1, characterized in that: The bottom of the heat absorption plate (306) is fixedly connected to a heat absorption plate (307), which is a square strip structure.

3. A hydraulically expanded self-locking packer according to claim 2, characterized in that: The heat absorption plate (306) has a circular ring structure, and the first inclined expansion sleeve (302) is internally connected to the cylindrical expansion sleeve (301) and the second inclined expansion sleeve (303).

4. A hydraulically expanded self-locking packer according to claim 3, characterized in that: The outer wall of the cylindrical expansion sleeve (301) is provided with a negative pressure groove (305), the negative pressure groove (305) is an annular groove, and a heat dissipation groove (308) is provided between the heat absorption plate (307) and the heat absorption disk (306).

5. A hydraulically expanded self-locking packer according to claim 4, characterized in that: The heat dissipation groove (308) is a rectangular groove, and the inner wall of the heat absorption plate (307) is provided with an auxiliary mechanism (4). The auxiliary mechanism (4) includes a sliding bar (401), which is a square strip structure.

6. A hydraulically expanded self-locking packer according to claim 5, characterized in that: The outer wall of the sliding strip (401) is slidably connected to the inner wall of the heat absorption plate (307), and one end of the sliding strip (401) is fixedly connected to a rotating shaft (402), which is a circular rod structure.

7. A hydraulically expanded self-locking packer according to claim 6, characterized in that: The outer wall of the rotating shaft (402) is rotatably connected to a rotating sleeve (403). The rotating sleeve (403) is a circular sleeve structure. A heat-conducting plate (405) is fixedly connected to the outer wall of the rotating sleeve (403). One end of the heat-conducting plate (405) is fixedly connected to a heat-conducting plate (405).

8. A hydraulically expanded self-locking packer according to claim 7, characterized in that: The heat-conducting plate (405) is a square plate structure. A heat-conducting block (406) is fixedly connected to the outer wall of the heat-conducting plate (405). The heat-conducting block (406) is a long strip plate structure. The heat-conducting block (406) extends axially and fits tightly against the inner wall of the heat dissipation groove (308).

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