High temperature hydraulic control sliding sleeve switch

Abstract

The application discloses a high-temperature hydraulic control sliding sleeve switch, and solves the technical problems of great operation safety risk, complicated operation and difficult horizontal well operation. The device comprises an upper joint, a lower joint, an outer cylinder, an inner cylinder, the inner cylinder is located on the inner side of the outer cylinder, and an annular cavity is formed between the inner cylinder and the outer cylinder; further comprising a piston assembly, which is vertically and slidingly arranged in the annular cavity; a connecting hole is arranged on the outer cylinder and is used for communicating with the outside space of the tool; a through hole is arranged on the piston assembly; an opening hole is arranged on the inner cylinder; a hydraulic channel is in communication with the annular cavity at one end and is used for being connected with a hydraulic control pipeline at the other end; a spring assembly is arranged in the annular cavity and is used for pushing the piston assembly to move upward, the vertical movement of the piston assembly is controlled through the external hydraulic control pipeline, and the opening and closing of the sliding sleeve switch are realized. The application can control the opening and closing of the sliding sleeve switch through hydraulic control on the ground, reduces the great operation safety risk, and improves the operation convenience.

Description

Technical Field

[0001] This invention belongs to the field of downhole tools technology for oil extraction, and specifically relates to a high-temperature hydraulically controlled sliding sleeve switch. Background Technology

[0002] The development of offshore oil and gas resources is a current hot topic and focus of global marine economic development. Offshore oil and gas resources are not only abundant, but modern science and technology have also given them enormous development capabilities. The offshore oil and gas industry has developed into a new, high-value leading industry within the marine economy. Sliding sleeve switches are important tools for downhole operations in oil extraction.

[0003] To improve the thermal recovery effect, heavy oil thermal recovery is currently promoting the application of integrated injection and production processes, as well as stratified and segmented steam injection, to reduce operating costs and improve steam injection efficiency. At this time, it is necessary to use sliding sleeve switches to control the opening and closing of the flow channels between the tubing and the annulus.

[0004] However, the sliding sleeve switches in related technologies are usually mechanical sliding sleeve switches or ball-throwing sliding sleeve switches. However, mechanical sliding sleeve switches or ball-throwing sliding sleeve switches have problems such as high safety risks in high-temperature and pressurized operations, complex operation, and difficulty in horizontal well operation, which need to be improved. Summary of the Invention

[0005] In order to solve all or some of the above problems, the purpose of this invention is to provide a high-temperature hydraulically controlled sliding sleeve switch, which can reduce the safety risks of high-temperature pressurized operations, improve the convenience of operation, and reduce the difficulty of operation.

[0006] This invention provides a high-temperature hydraulically controlled sliding sleeve switch, comprising:

[0007] The upper connector is used to connect to the upper tool.

[0008] The lower connector is used to connect to the lower tool.

[0009] The outer cylinder is connected at its top end to the upper connector and at its bottom end to the lower connector;

[0010] The inner cylinder is connected to the upper connector at its top end and to the lower connector at its bottom end. The inner cylinder is located inside the outer cylinder, and an annular cavity is formed between the inner cylinder and the outer cylinder.

[0011] The piston assembly is vertically slidably disposed within the annular cavity;

[0012] A connecting hole is provided on the outer cylinder and is used to communicate with the external space of the tool;

[0013] A through hole is provided on the piston assembly;

[0014] An opening is provided on the inner cylinder;

[0015] The hydraulic channel has one end connected to the annular cavity and the other end used to connect to the hydraulic control line;

[0016] A spring assembly is disposed within the annular cavity and is used to push the piston assembly upward;

[0017] When the external hydraulic control line is opened, the piston assembly moves downward and connects the connecting hole and the opening hole through the through hole to realize the opening control of the sliding sleeve switch; when the external hydraulic control line is closed, the piston assembly moves upward under the push of the spring assembly and closes the connecting hole to realize the closing control of the sliding sleeve switch.

[0018] Optionally, the outer cylinder includes a shell connecting sleeve, a shell sealing sleeve, and a spring sleeve connected sequentially from top to bottom. The shell connecting sleeve is connected to the upper connector, the spring sleeve is connected to the lower connector, and the connecting hole is provided on the shell sealing sleeve.

[0019] The inner cylinder includes an upper central tube, a lower central tube, and a lower spring seat connected sequentially from top to bottom. The upper central tube is connected to an upper connector, and the lower spring seat is connected to a lower connector. The upper connector, the upper central tube, the lower central tube, the lower spring seat, and the lower connector together form a central passage. The opening hole is provided on the lower central tube and communicates with the central passage.

[0020] Optionally, the piston assembly includes:

[0021] Two piston sleeves are symmetrically distributed on both sides of the annular cavity;

[0022] Two piston rods are vertically slidably mounted on the corresponding piston sleeves, with the top ends of the piston rods located within the hydraulic channel;

[0023] Two sets of sealing rings are provided, one for each piston rod and the other for each piston sleeve, to improve the sealing effect between the piston rod and the piston sleeve.

[0024] The control component is vertically slidably disposed within the annular cavity, and the through hole is disposed on the control component;

[0025] The piston rod is used to push the control component downward, and the spring assembly is used to push the control component upward.

[0026] Optionally, the piston rod is provided with a sealing conical surface, and the top end of the piston sleeve is provided with a supporting conical surface, and the supporting conical surface matches the sealing conical surface.

[0027] Optionally, the hydraulic channel includes:

[0028] There are two hydraulic control passages, each located within the upper connector, with the top ends of the two piston rods respectively located within the corresponding hydraulic control passages;

[0029] There are two hydraulic control holes, each located on the upper connector. The bottom of each hydraulic control hole is connected to the corresponding hydraulic control passage, and the top of each hydraulic control hole is used to connect to the hydraulic control pipeline.

[0030] Optionally, the control component includes:

[0031] The flow sleeve is vertically slidably disposed in the annular cavity, and the through hole is opened on the flow sleeve. A piston ring and a piston retaining ring are respectively disposed at both ends of the flow sleeve. The elastic force of the spring assembly can act on the bottom surface of the piston ring located at the lower position.

[0032] A piston connecting sleeve is disposed at the upper end of the flow sleeve. The top of the piston connecting sleeve is provided with a stepped surface, and the stepped surface is tightly fitted with the bottom surfaces of the two piston sleeves respectively.

[0033] Optionally, sealing rings are provided on the inner and outer sides of the two piston rings, and the annular cavity is divided into a top cavity, a middle cavity and a bottom cavity;

[0034] The piston connecting sleeve divides the top cavity into top annular cavity one, top annular cavity two, and top annular cavity three. The piston connecting sleeve is provided with a piston flow hole, which connects top annular cavity two and top annular cavity three. The upper central tube is provided with multiple first flow holes and second flow holes, and the first flow holes are connected to top annular cavity one, and the second flow holes are connected to top annular cavity two.

[0035] Optionally, the flow sleeve divides the central cavity into a central annular cavity one and a central annular cavity two, the through hole connects the central annular cavity one and the central annular cavity two, the connecting hole connects to the central annular cavity one, and the opening hole connects to the bottom cavity. When the flow sleeve moves downward, the opening hole connects to the central annular cavity two to open the sliding sleeve switch. When the flow sleeve moves upward, the opening hole separates from the central annular cavity two to close the sliding sleeve switch.

[0036] Optionally, a plurality of third flow holes are uniformly formed on the lower central tube, and the plurality of third flow holes are respectively connected to the bottom cavity.

[0037] Optionally, the spring assembly includes:

[0038] The upper spring seat is disposed in the bottom cavity and abuts against the bottom surface of the piston ring located below;

[0039] A support spring is disposed in the bottom cavity, with its top end fixed to the upper spring seat and its bottom end fixed to the lower spring seat.

[0040] As can be seen from the above technical solution, the high-temperature hydraulically controlled sliding sleeve switch provided by the present invention has the following advantages:

[0041] This device allows for the opening and closing of a sliding sleeve switch via ground hydraulic control during thermal extraction operations. This reduces safety risks associated with high-temperature, pressurized work, improves operational convenience, and lowers operational difficulty. Furthermore, the sliding sleeve switch can withstand a working pressure difference of 20 MPa at 350°C, meeting on-site usage requirements, and boasts a simple structure and reliable performance. Moreover, the sliding sleeve switch employs a pressure balance design, resulting in lower opening pressure and a greater insertion depth.

[0042] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0043] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0044] Figure 1 This is a schematic diagram of the high-temperature hydraulically controlled sliding sleeve switch in the closed state in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the high-temperature hydraulically controlled sliding sleeve switch in the open state in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the upper part of the high-temperature hydraulically controlled sliding sleeve switch in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the structure of the lower part of the high-temperature hydraulically controlled sliding sleeve switch in an embodiment of the present invention;

[0048] Figure 5 for Figure 2 An enlarged schematic diagram of region A in the middle.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Upper connector; 2. Piston rod; 3. Piston sleeve; 4. Sealing ring; 5. Housing connecting sleeve; 6. Piston connecting sleeve; 61. Stepped surface; 62. Piston flow hole; 7. Piston retaining ring; 9. Sealing ring; 10. Piston ring; 11. Flow sleeve; 112. Through hole; 12. Housing sealing sleeve; 121. Connecting hole; 13. Upper central tube; 131. First flow hole; 132. Second flow hole; 133. Opening hole; 14. Upper spring seat; 15. Spring sleeve; 16. Support spring; 17. Lower central tube; 171. Third flow hole; 18. Lower spring seat; 19. Lower connector; 191. Support groove; 20. Outer cylinder; 22. Inner cylinder; 23. Annular cavity; 24. Piston assembly; 25. Spring assembly; 26. Control assembly;

[0051] 21. Sealing conical surface; 31. Supporting conical surface;

[0052] 100. Hydraulic channel; 101. Hydraulic control port; 102. Hydraulic control passage;

[0053] 201. Central pathway;

[0054] 200. Top cavity; 202. Top annular cavity one; 212. Top annular cavity two; 222. Top annular cavity three;

[0055] 205. Central cavity; 203. Central annular cavity one; 213. Central annular cavity two;

[0056] 204. Bottom cavity. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0058] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The illustration shows an embodiment of the present invention, which discloses a high-temperature hydraulically controlled sliding sleeve switch, including an upper connector 1, a lower connector 19, an outer cylinder 20, and an inner cylinder 22. The upper connector 1 is used to connect to an upper tool, and the lower connector 19 is used to connect to a lower tool. The top ends of the outer cylinder 20 and the inner cylinder 22 are respectively connected to the upper connector 1, and the bottom ends are respectively connected to the lower connector 19. The inner cylinder 22 is located inside the outer cylinder 20, and an annular cavity 23 is formed between the inner cylinder 22 and the outer cylinder 20.

[0059] In one embodiment, such as Figure 3 , Figure 4As shown, a piston assembly 24 is vertically slidably connected within the annular cavity 23. A connecting hole 121 is provided on the outer cylinder 20, which is used to communicate with the external space of the tool. A through hole 112 is provided on the piston assembly 24, and an opening hole 133 is provided on the inner cylinder 22.

[0060] In one embodiment, such as Figure 3 , Figure 4 As shown, the upper connector 1 is provided with a hydraulic channel 100. One end of the hydraulic channel 100 is connected to the annular cavity 23, and the other end is used to connect to the hydraulic control line to realize ground hydraulic control. A spring assembly 25 is provided inside the annular cavity 23, and the spring assembly 25 is used to push the piston assembly 24 to move upward.

[0061] When the external hydraulic control line is opened, i.e., after ground pressurization, the piston assembly 24 moves downward, connecting the connection hole 121 and the opening hole 133 through the through hole 112. At this time, the sliding sleeve switch is opened. When the external hydraulic control line is closed, the piston assembly 24 moves upward under the push of the spring assembly 25, closing the connection hole 121. At this time, the sliding sleeve switch is closed.

[0062] The high-temperature hydraulically controlled sliding sleeve switch in this embodiment controls the opening and closing of the sliding sleeve switch via ground hydraulic control, which reduces the safety risks of high-temperature and pressurized operations, improves operational convenience, and reduces operational difficulty. Furthermore, this sliding sleeve switch can withstand a working pressure difference of 20MPa at a high temperature of 350℃, meeting the field usage conditions, and has a simple structure and reliable performance.

[0063] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the outer cylinder 20 includes a shell connecting sleeve 5, a shell sealing sleeve 12 and a spring sleeve 15 connected sequentially from top to bottom. The shell connecting sleeve 5 is connected to the upper connector 1, the spring sleeve 15 is connected to the lower connector 19, and the connecting hole 121 is opened on the shell sealing sleeve 12.

[0064] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the inner cylinder 22 includes an upper central tube 13, a lower central tube 17 and a lower spring seat 18 connected sequentially from top to bottom. The upper central tube 13 is connected to the upper connector 1. The lower connector 19 has a support groove 191. The lower spring seat 18 is located in the support groove 191 and is connected to the lower connector 19.

[0065] In one embodiment, such as Figure 2 , Figure 3 , Figure 4As shown, the upper connector 1, the upper central tube 13, the lower central tube 17, the lower spring seat 18, and the lower connector 19 together form a central passage 201. The opening hole 133 is opened on the lower central tube 17 and is connected to the central passage 201.

[0066] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the piston assembly 24 includes two piston sleeves 3, which are symmetrically distributed on both sides of the annular cavity 23. A piston rod 2 is vertically slidably mounted on each piston sleeve 3, with the top end of the piston rod 2 located within the hydraulic channel 100. Simultaneously, a set of sealing rings 4 is provided between each piston rod 2 and its corresponding piston sleeve 3 to improve the sealing effect between the piston rod 2 and the piston sleeve 3. In this embodiment, each set of sealing rings 4 has two or three rings.

[0067] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, a control component 26 is vertically slidably connected within the annular cavity 23, and a through hole 112 is provided on the control component 26. When the ground hydraulic control line is pressurized, the piston rod 2 can push the control component 26 downward under the action of hydraulic pressure. When the ground hydraulic control line is closed, the spring assembly 25 can push the control component 26 upward to achieve the reset of each component.

[0068] In one embodiment, such as Figure 2 , Figure 5 As shown, a sealing cone surface 21 is integrally formed on the piston rod 2, and a supporting cone surface 31 is integrally formed on the top of the piston sleeve 3. The supporting cone surface 31 matches the sealing cone surface 21, which serves to position the stroke and form a cone-to-cone shut-off seal to improve the sealing performance.

[0069] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the hydraulic channel 100 includes two hydraulic control passages 102, which are respectively opened in the upper connector 1 and communicate with the annular cavity 23. At the same time, the top ends of the two piston rods 2 are respectively located in the corresponding hydraulic control passages 102.

[0070] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the upper connector 1 has two hydraulic control holes 101. The bottom of the two hydraulic control holes 101 are connected to the corresponding hydraulic control passages 102, and the tops are used to connect to the hydraulic control pipelines, so that the sliding sleeve switch can be stably connected to the ground hydraulic control pipelines.

[0071] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the control assembly 26 includes a flow sleeve 11 that is vertically slidably disposed in the annular cavity 23, and a through hole 112 is formed on the flow sleeve 11. A piston ring 10 and a piston retaining ring 7 are respectively disposed at both ends of the flow sleeve 11, and the elastic force of the spring assembly 25 can act on the bottom surface of the piston ring 10 located at the lower position.

[0072] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, a piston connecting sleeve 6 is provided at the upper end of the flow sleeve 11. The top of the piston connecting sleeve 6 is integrally formed with a stepped surface 61, and the stepped surface 61 is tightly fitted with the bottom surfaces of the two piston sleeves 3 respectively.

[0073] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, sealing rings 9 are respectively provided on the inner and outer sides of the two piston rings 10, dividing the annular cavity 23 into a top cavity 200, a middle cavity 205, and a bottom cavity 204. The piston connecting sleeve 6 divides the top cavity 200 into a first top annular cavity 202, a second top annular cavity 212, and a third top annular cavity 222. A piston flow hole 62 is provided on the piston connecting sleeve 6, which connects the second top annular cavity 212 and the third top annular cavity 222. Multiple first flow holes 131 and second flow holes 132 are provided on the upper central tube 13, with the first flow holes 131 communicating with the first top annular cavity 202 and the second flow holes 132 communicating with the second top annular cavity 212.

[0074] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the flow sleeve 11 divides the central cavity 205 into a central annular cavity 203 and a central annular cavity 213. A through hole 112 connects the central annular cavity 203 and the central annular cavity 213. A connecting hole 121 connects to the central annular cavity 203, and an opening hole 133 connects to the bottom cavity 204. When the flow sleeve 11 moves downwards, the opening hole 133 connects to the central annular cavity 213, opening the sliding sleeve switch. When the flow sleeve 11 moves upwards, the opening hole 133 separates from the central annular cavity 213, closing the sliding sleeve switch. Simultaneously, multiple third flow holes 171 are evenly distributed on the lower central tube 17, and each of these third flow holes 171 connects to the bottom cavity 204.

[0075] In one embodiment, such as Figure 2 , Figure 3 , Figure 4As shown, the spring assembly 25 includes an upper spring seat 14 and a support spring 16. The upper spring seat 14 and the support spring 16 are respectively disposed in the bottom cavity 204. The upper spring seat 14 abuts against the bottom surface of the piston ring 10 located below. The top end of the support spring 16 is fixed to the upper spring seat 14 and the bottom end is fixed to the lower spring seat 18.

[0076] In this implementation, the sliding switch is in the closed state when no pressure is applied to the ground. At this time, the support spring 16, positioned by the lower spring seat 18, has an upward restoring force, maintaining the upper spring seat 14, piston connecting sleeve 6, and piston rod 2 in an upward tendency, so that the piston rod 2 can overcome the liquid column pressure of the hydraulic control passage 102 and maintain its uppermost position. At the same time, the stepped surface 61 at the top of the piston connecting sleeve 6 is in contact with the lower surface of the piston sleeve 3.

[0077] The first flow passage 131 connects the central passage 201 and the top annular cavity 202. The second flow passage 132 and the piston flow passage 62 connect the top annular cavity 212, the top annular cavity 222, and the central passage 201. The opening hole 133 and the third flow passage 171 connect the bottom cavity 204 to the central passage 201. At this time, the central passage 201, the top cavity 200, and the bottom cavity 204 are in the same pressure system, and the fluid pressure in the central passage 201 will not exert a force on the piston assembly 24.

[0078] The connecting hole 121 and the through hole 112 connect the external space of the tool to the first and second central annular cavities 203 and 213. Simultaneously, the two sets of piston rings 10 and the sealing ring 9 isolate the central cavity 205 from the top cavity 200 and the bottom cavity 204, placing the external space of the tool and the central cavity 205 under the same pressure system. Since the piston areas of the two piston rings 10 are identical, the external pressure of the tool does not exert any force on the piston assembly 24. Because neither the external pressure of the tool nor the central passage 201 exerts any external force on the piston assembly 24, the closing action of the sliding sleeve switch is more reliable and unaffected by external operating conditions.

[0079] In its implementation in this city, when the sliding sleeve switch needs to be opened, ground pressure is transmitted to the hydraulic control passage 102 through the hydraulic control pipeline. Subsequently, components such as the piston rod 2, piston connecting sleeve 6, and upper spring seat 14 move downwards under the action of hydraulic pressure, overcoming the rebound force of the support spring 16. Immediately afterwards, the sealing cone surface 21 and the support cone surface 31 form an abutment fit, which serves both as a stroke positioning function and as a cone-to-cone stop seal, improving the sealing performance of the hydraulic control passage 102.

[0080] At this time, the first flow-through hole 131 connects the central passage 201 and the top annular cavity 202, and the second flow-through hole 132 and the piston flow-through hole 62 connect the top annular cavity 212, the top annular cavity 222, and the central passage 201. The opening hole 133, the through hole 112, and the connecting hole 121 together connect the tool's external space, the middle annular cavity 203, the middle annular cavity 213, and the central passage 201, that is, the central passage 201 and the tool's external space are connected, thereby realizing the opening of the sliding sleeve switch. At the same time, the third flow-through hole 171 connects the central passage 201 and the bottom cavity 204.

[0081] Since the central passage 201, top cavity 200, middle cavity 205, bottom cavity 204, and tool external space are within the same pressure system, neither the central passage 201 nor the tool external space exerts any force on the piston assembly 24. Because the stepped surface 61 fits snugly against the housing sealing sleeve 12, the first flow hole 131 and the second flow hole 132 can effectively communicate with the top annular cavity 1 202, the top annular cavity 212, and the top annular cavity 3 222, avoiding resistance due to throttling during the opening or closing of the sliding sleeve switch.

[0082] The sliding sleeve switch achieves effective connection of multiple sealed or semi-sealed spaces through multiple flow holes, effectively balancing the pressure on both sides of the piston assembly 24, preventing the sliding sleeve switch from failing to operate due to pressure imbalance during opening or closing, and making the operation more stable.

[0083] As described above, this device enables the opening and closing of the sliding sleeve switch via ground hydraulic control, reducing safety risks associated with high-temperature and pressurized operations, improving operational convenience, and lowering operational difficulty. Furthermore, the sliding sleeve switch can withstand a working pressure difference of 20MPa at 350℃, meeting on-site usage conditions, and boasts a simple structure and reliable performance. Moreover, the sliding sleeve switch employs a pressure balance design, resulting in lower opening pressure and a greater insertion depth.

[0084] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0085] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-temperature hydraulically controlled sliding sleeve switch, characterized in that, include: Upper connector (1), used to connect to the upper tool; The lower connector (19) is used to connect to the lower tool; The outer cylinder (20) is connected at its top end to the upper connector (1) and at its bottom end to the lower connector (19); The inner cylinder (22) is connected to the upper connector (1) at its top end and to the lower connector (19) at its bottom end. The inner cylinder (22) is located inside the outer cylinder (20), and an annular cavity (23) is formed between the inner cylinder (22) and the outer cylinder (20). The piston assembly (24) is vertically slidably disposed within the annular cavity (23); A connecting hole (121) is provided on the outer cylinder (20) and is used to communicate with the external space of the tool; A through hole (112) is provided on the piston assembly (24); An opening hole (133) is provided on the inner cylinder (22); The hydraulic channel (100) is connected at one end to the annular cavity (23) and at the other end to the hydraulic control line; A spring assembly (25) is disposed within the annular cavity (23) and is used to push the piston assembly (24) upward; When the external hydraulic control line is opened, the piston assembly (24) moves downward and the through hole (112) connects the connecting hole (121) and the opening hole (133) to realize the opening control of the sliding sleeve switch; when the external hydraulic control line is closed, the piston assembly (24) moves upward under the push of the spring assembly (25) and closes the connecting hole (121) to realize the closing control of the sliding sleeve switch. The outer cylinder (20) includes a shell connecting sleeve (5), a shell sealing sleeve (12) and a spring sleeve (15) connected sequentially from top to bottom. The shell connecting sleeve (5) is connected to the upper connector (1), the spring sleeve (15) is connected to the lower connector (19), and the connecting hole (121) is provided on the shell sealing sleeve (12). The inner cylinder (22) includes an upper central tube (13), a lower central tube (17) and a lower spring seat (18) connected sequentially from top to bottom. The upper central tube (13) is connected to the upper connector (1), and the lower spring seat (18) is connected to the lower connector (19). The upper connector (1), the upper central tube (13), the lower central tube (17), the lower spring seat (18) and the lower connector (19) together form a central passage (201). The opening hole (133) is provided on the lower central tube (17) and communicates with the central passage (201). The piston assembly (24) includes: Piston sleeves (3), two in number, are symmetrically distributed on both sides of the annular cavity (23); Two piston rods (2) are vertically slidably mounted on the corresponding piston sleeves (3), and the top of the piston rods (2) is located in the hydraulic channel (100); Two sets of sealing rings (4) are respectively disposed between the piston rod (2) and the corresponding piston sleeve (3) to improve the sealing effect between the piston rod (2) and the piston sleeve (3); The control component (26) is vertically slidably disposed in the annular cavity (23), and the through hole (112) is disposed on the control component (26); Wherein, the piston rod (2) is used to push the control component (26) to move downward, and the spring component (25) is used to push the control component (26) to move upward; The control component (26) includes: The flow sleeve (11) is vertically slidably disposed in the annular cavity (23), and the through hole (112) is opened on the flow sleeve (11). The two ends of the flow sleeve (11) are respectively provided with piston ring (10) and piston retaining ring (7). The elastic force of the spring assembly (25) can act on the bottom surface of the piston ring (10) located at the lower position. A piston connecting sleeve (6) is disposed at the upper end of the flow sleeve (11). The top of the piston connecting sleeve (6) is provided with a stepped surface (61), and the stepped surface (61) is tightly fitted with the bottom surfaces of the two piston sleeves (3). The inner and outer sides of the two piston rings (10) are respectively provided with sealing rings (9), which divide the annular cavity (23) into a top cavity (200), a middle cavity (205) and a bottom cavity (204); The piston connecting sleeve (6) divides the top cavity (200) into top annular cavity one (202), top annular cavity two (212) and top annular cavity three (222). The piston connecting sleeve (6) is provided with a piston flow hole (62), which connects top annular cavity two (212) and top annular cavity three (222). The upper central tube (13) is provided with a plurality of first flow holes (131) and second flow holes (132). The first flow holes (131) are connected to top annular cavity one (202), and the second flow holes (132) are connected to top annular cavity two (212).

2. The high-temperature hydraulically controlled sliding sleeve switch according to claim 1, characterized in that, The piston rod (2) is provided with a sealing cone surface (21), and the top end of the piston sleeve (3) is provided with a supporting cone surface (31), and the supporting cone surface (31) matches the sealing cone surface (21).

3. The high-temperature hydraulically controlled sliding sleeve switch according to claim 1, characterized in that, The hydraulic channel (100) includes: There are two hydraulic control passages (102), each opened in the upper connector (1), and the top ends of the two piston rods (2) are respectively located in the corresponding hydraulic control passages (102); Two hydraulic control holes (101) are provided on the upper connector (1). The bottom of each hydraulic control hole (101) is connected to the corresponding hydraulic control passage (102), and the top is used to connect to the hydraulic control pipeline.

4. The high-temperature hydraulically controlled sliding sleeve switch according to claim 1, characterized in that, The flow sleeve (11) divides the central cavity (205) into a central annular cavity one (203) and a central annular cavity two (213). The through hole (112) connects the central annular cavity one (203) and the central annular cavity two (213). The connecting hole (121) connects to the central annular cavity one (203). The opening hole (133) connects to the bottom cavity (204). When the flow sleeve (11) moves downward, the opening hole (133) connects to the central annular cavity two (213) to open the sliding sleeve switch. When the flow sleeve (11) moves upward, the opening hole (133) separates from the central annular cavity two (213) to close the sliding sleeve switch.

5. The high-temperature hydraulically controlled sliding sleeve switch according to claim 1, characterized in that, The lower central tube (17) is provided with a plurality of third flow holes (171) evenly distributed, and the plurality of third flow holes (171) are respectively connected to the bottom cavity (204).

6. The high-temperature hydraulically controlled sliding sleeve switch according to claim 1, characterized in that, The spring assembly (25) includes: The upper spring seat (14) is disposed in the bottom cavity (204) and abuts against the bottom surface of the piston ring (10) located below; A support spring (16) is disposed in the bottom cavity (204). The top end of the support spring (16) is fixed to the upper spring seat (14), and the bottom end is fixed to the lower spring seat (18).

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