Hydraulic control well flushing valve

Abstract

This invention relates to the field of well washing technology, specifically a hydraulically controlled well washing valve. It includes an upper connector, a sliding sleeve, a central tube, a spring, and a retaining ring. A first outer ring platform is located on the outer side of the lower end of the upper connector. A central tube, with its lower end positioned below it, is fixedly installed on the inner side of the middle portion of the upper connector. From bottom to top, the inner side of the lower end of the upper connector has a first inner ring groove and a second inner ring groove, with the inner diameter of the first inner ring groove being larger than that of the second inner ring groove. This invention features a reasonable and compact structure, is easy to use, and utilizes a guide vertical groove to allow the guide and limiting pin to move up and down, thus guiding and limiting the movement of the sliding sleeve. The inner and outer through-holes connect to facilitate the ejection of high-temperature hot washing fluid from the outer through-hole, creating negative pressure in the annulus below, ensuring reliable sealing of the annulus by the packer below and preventing large amounts of high-temperature hot washing fluid from entering the reservoir. It is characterized by stability, reliability, and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of well cleaning technology, specifically a hydraulically controlled well cleaning valve. Background Technology

[0002] In crude oil production, when crude oil travels upwards to areas with lower tubing temperatures, wax forms on the tubing walls, reducing the flow channel area, increasing the load on production equipment, increasing energy consumption, and even causing production shutdowns. To ensure normal crude oil production, crude oil producers need to implement various wax removal measures to clean the inner walls of the tubing. Previously, the tubing was pulled out of the wellbore, and high-pressure steam was used to remove the wax buildup inside and outside the tubing, which was very costly. To avoid moving the tubing, a movable wax scraper was later installed on the sucker rod in rod-operated wells. The reciprocating motion of the sucker rod scraped off some of the wax buildup inside the tubing, which was somewhat effective, but some wax remained, increasing the load on the pumping unit and affecting normal production. With the application of hollow sucker rods in production, a hot-washing wax removal method using hollow sucker rods and a well-washing check valve is employed. High-temperature hot water is injected from the middle of the hollow sucker rod, the well-washing check valve is opened, and the hot water returns to the surface through the annulus between the hollow sucker rod and the tubing, completing the hot-washing wax removal process. Because hollow sucker rods are more expensive than ordinary solid sucker rods, and the annulus between the sucker rod and the tubing is smaller, the resistance to crude oil flow is increased, the waxing is more severe, and the wax removal cycle is further shortened, which in turn increases the production costs of oil and gas production companies.

[0003] Patent document CN211692367U discloses an oil well washing valve device, comprising: a central pipe with a radial through hole; a sealing joint fitted on the outer wall of the central pipe, the inner wall of the sealing joint being axially sealed and slidingly connected to the outer wall of the central pipe, capable of sealing and releasing the radial through hole; and an elastic return mechanism, also fitted on the outer wall of the central pipe, with its lower end connected to the sealing joint; the elastic return mechanism includes: an outer pipe fitted on the outer wall of the central pipe, its lower end connected to the sealing joint, and its inner wall being sealed to the outer wall of the central pipe. A sealed cavity is formed between the walls. The cross-sectional area of ​​the lower end of the sealed cavity is equal to the area of ​​the upper end face of the sealing joint, and the area of ​​the upper end face of the sealing joint is smaller than the area of ​​the lower end face of the sealing joint. A spring is also fitted onto the outer wall of the central tube, with its lower end pressing against the upper end face of the outer tube. A reducing diameter ring is formed at the upper end of the outer tube, and an expanding diameter ring is formed on the outer wall of the central tube. The inner diameter of the reducing diameter ring is smaller than the outer diameter of the expanding diameter ring, i.e., the upper end face of the expanding diameter ring is axially limited to the lower end face of the reducing diameter ring. A sealing groove is formed on the outer circumference of the expanding diameter ring, and a sealing ring is installed in the sealing groove. This sealing ring makes the inner wall of the outer tube and the outer wall of the expanding diameter ring a sealed state.

[0004] Patent document CN208122789U discloses a hydraulically controlled well-washing valve for water injection wells, comprising an upper cylinder sleeve and a lower cylinder sleeve. The lower cylinder sleeve has a flow hole on its cylinder body. The upper and lower cylinder sleeves are threaded together. The upper part of the upper cylinder sleeve is connected to an upper connector with a central hole. A hydraulically controlled valve core is installed inside the upper and lower cylinder sleeves. The flow hole of the hydraulically controlled valve core can communicate with the flow hole on the lower cylinder sleeve. The hydraulically controlled valve core includes a mandrel, an upper sealing body, a lower sealing body, and a back cap, which are threaded together sequentially from top to bottom. A spring is also installed between the mandrel and the inner circular step of the upper cylinder sleeve. The flow hole of the hydraulically controlled valve core is located in the upper sealing body. Sealing sleeves are installed on both sides of the flow hole of the hydraulically controlled valve core and the flow ring groove of the lower sealing body. The upper sealing body comprises three sealing sleeves: a second sealing sleeve and a third sealing sleeve. The mandrel is a T-shaped solid rod-shaped body. A spring is installed between the upper step of the mandrel and the inner circular step of the upper cylinder sleeve. A fluid flow gap is left between the rod body of the mandrel and the lower central hole of the upper cylinder sleeve. The upper body of the upper sealing body has no central blind hole and is threadedly connected to the mandrel. The lower body has an inner cavity and a fluid flow ring groove on the outer wall of the lower body. A fluid flow hole for the hydraulic control valve core is set in the fluid flow ring groove on the outer wall of the upper sealing body. The lower sealing body has a central hole, which corresponds to the lower inner cavity of the upper sealing body. When the hydraulic control valve core is in the closed state, the fluid flow ring groove of the lower sealing body corresponds to the fluid flow hole of the lower cylinder sleeve. When the hydraulic control valve core is in the open state, the fluid flow hole in the fluid flow ring groove of the upper sealing body communicates with the fluid flow hole of the lower cylinder sleeve. Summary of the Invention

[0005] This invention provides a hydraulically controlled well-washing valve that overcomes the shortcomings of the prior art and can effectively solve the problem that existing wax removal operations cannot perform hot washing and wax removal by keeping the tubing stationary.

[0006] The technical solution of this invention is achieved through the following measures: A hydraulically controlled well-washing valve includes an upper connector, a sliding sleeve, a central tube, a spring, and a retaining ring. A first outer ring platform is provided on the outer side of the lower end of the upper connector. A central tube with its lower end located below it is fixedly installed on the inner side of the middle part of the upper connector. A first inner ring groove and a second inner ring groove are sequentially provided from bottom to top on the inner side of the lower end of the upper connector. The inner diameter of the first inner ring groove is larger than the inner diameter of the second inner ring groove. A retaining ring is fixedly installed on the outer side of the lower part of the central tube. A sliding sleeve and a spring are sequentially provided from top to bottom on the outer side of the central tube corresponding to the position between the upper connector and the retaining ring. A second outer ring platform and a third outer ring platform are sequentially provided from top to bottom on the outer side of the upper part of the central tube. The outer diameter of the second outer ring platform is larger than the outer diameter of the third outer ring platform. The upper end of the second outer ring platform is located below the first inner ring groove. A first inner ring platform and a second inner ring platform are sequentially provided from top to bottom on the inner side of the lower end of the sliding sleeve. The inner diameter of the first inner ring platform is larger than that of the second inner ring platform. The first inner ring platform is located below the second outer ring platform, and the second inner ring platform is located below the third outer ring platform. The upper side of the first outer ring platform is provided with a first liquid passage hole whose lower end communicates with the second inner ring groove. The outer side of the central tube corresponding to the position between the lower end of the second outer ring platform and the upper end of the first inner ring platform is provided with a push hole. The upper side of the second outer ring platform is provided with a second liquid passage hole whose lower end communicates with the inner end of the push hole. The outer side of the sliding sleeve corresponding to the position between the second inner ring platform and the third outer ring platform is provided with a pressure relief hole that is connected internally and externally. The inner side of the upper part of the second inner ring platform is provided with a third inner ring groove. The outer side of the lower part of the sliding sleeve is provided with several external guide holes that can communicate with the third inner ring groove at intervals along the circumference. The outer side of the middle part of the central tube corresponding to the position between the external guide holes and the spring is provided with an outer ring groove. The inner side of the middle part of the central tube is provided with several internal guide holes that can communicate with the outer ring groove at intervals along the circumference.

[0007] The following are further optimizations and / or improvements to the above-mentioned technical solution: The above may also include O-rings, with at least one O-ring spaced vertically between the second outer ring platform and the upper connector, at least one O-ring spaced vertically between the upper part of the sliding sleeve above the push hole and the second outer ring platform, at least one O-ring spaced vertically between the first inner ring platform and the third outer ring platform below the push hole, at least one O-ring spaced vertically between the second inner ring platform above the third inner ring groove and the central tube, at least one O-ring spaced vertically between the second inner ring platform between the third inner ring groove and the outer ring groove and the central tube, and at least one O-ring spaced vertically between the second inner ring platform below the outer ring groove and the central tube.

[0008] The above may also include guide pins, and at least two vertically arranged guide grooves are provided on the outer side of the center tube at the position above the lower end of the slide sleeve along the circumference. A guide pin with its inner end located in the upper end of the guide groove is fixedly installed on the outer side of the lower part of the slide sleeve at the position of each guide groove.

[0009] The lower outer side of the aforementioned sliding sleeve may have two external through holes evenly distributed along the circumference, each external through hole being inclined with the outer side higher than the inner side, and four internal through holes evenly distributed along the circumference on the inner side of the middle part of the central tube.

[0010] The above may also include a capillary connector, wherein a capillary connector is fixedly installed on the inner side of the upper end of the first liquid passage.

[0011] The above may also include a tubing coupling, with a tubing coupling fixedly installed on the outer side of the upper end of the upper connector.

[0012] The above may also include set screws, a central tube is fixedly installed on the inner side of the middle part of the upper connector by a threaded connection, a retaining ring is fixedly installed on the outer side of the lower part of the central tube by a threaded connection, and at least two set screws are provided at intervals along the circumference on the outer side of the retaining ring to fix it together with the central tube.

[0013] This invention features a reasonable and compact structure, and is easy to use. By setting a guide groove, the guide limiting pin can move up and down within it, thereby guiding and limiting the movement of the sliding sleeve. The inner and outer through holes are connected, facilitating the spraying of high-temperature hot washing fluid from the outer through hole, creating a negative pressure on the annulus below. This ensures that the packer below can reliably seal the annulus, preventing a large amount of high-temperature hot washing fluid from entering the reservoir. It is characterized by stability, reliability, and high efficiency. Attached Figure Description

[0014] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of embodiments 1 to 7 of the present invention.

[0015] Appendix Figure 2 For the appendix Figure 1 Enlarged structural schematic diagram of the upper and middle joint from the front view.

[0016] Appendix Figure 3 For the appendix Figure 1 Enlarged structural schematic diagram of the central tube from the front view section.

[0017] Appendix Figure 4 For the appendix Figure 1 Enlarged structural schematic diagram of the main sectional view of the middle sliding sleeve.

[0018] Appendix Figure 5 This is a schematic diagram of the main cross-sectional structure of the hydraulically controlled cup packer in Example 8.

[0019] Appendix Figure 6 This is a schematic cross-sectional view of the hydraulically controlled packer for cable transfer in Example 9. Figure 1 .

[0020] Appendix Figure 7 This is a schematic cross-sectional view of the hydraulically controlled packer for cable transfer in Example 9. Figure 2 .

[0021] Appendix Figures 1 to 4 The codes in the diagram are as follows: 1 for upper connector, 2 for sliding sleeve, 3 for central tube, 4 for spring, 5 for retaining ring, 6 for O-ring seal, 7 for guide limit pin, 8 for capillary connector, 9 for oil pipe coupling, 10 for set screw, 11 for first outer ring platform, 12 for second outer ring platform, 13 for third outer ring platform, 14 for first inner ring platform, 15 for second inner ring platform, 16 for first inner ring groove, 17 for second inner ring groove, 18 for third inner ring groove, 19 for outer ring groove, 20 for guide vertical groove, 21 for first liquid passage hole, 22 for second liquid passage hole, 23 for push hole, 24 for pressure relief hole, 25 for external through hole, and 26 for internal through hole.

[0022] Appendix Figure 5 The codes in the diagram are as follows: 101 is the bleed valve seat, 102 is the lower connector, 103 is the filter cartridge, 104 is the piston cup, 105 is the support frame, 106 is the bleed channel, 107 is the sealing ring, 108 is the mounting ring, 109 is the sealing ring, 110 is the connecting neck, 111 is the guide hole, 112 is the unblocking spring, 113 is the floating piston, 114 is the plug, 115 is the connecting cone hole, 116 is the mounting cone hole, 117 is the fixed ring, 118 is the guide cone hole, 119 is the connecting ring, and 120 is the filter hole.

[0023] Appendix Figures 6 to 7 The codes in the diagram are as follows: 201 is the adapter, 202 is the connector, 203 is the retaining ring, 204 is the eccentric connecting neck, 205 is the hydraulic cylinder, 206 is the mounting plate, 207 is the hydraulic eccentric hole, 208 is the hydraulic cylinder ring platform, 209 is the hydraulic hole, 210 is the hydraulic blind hole, 211 is the connecting ring groove, 212 is the cable outlet hole, 213 is the cable routing blind hole, 214 is the rubber sleeve assembly, 215 is the push ring platform, 216 is the cable routing vertical groove, 217 is the connecting sleeve, 218 is the upper support ring, 219 is the upper spring, 220 is the bushing, 221 is the pressure cap, 222 is the spring seat, and 223 is the lower... Support ring, 224 is lower spring, 225 is drag screw, 226 is bushing ring platform, 227 is support ring platform, 228 is guide limit pin, 229 is guide vertical groove, 230 is O-ring seal, 231 is capillary ferrule, 232 is inlet hole, 233 is hydraulic window, 234 is flat cable sealing sleeve, 235 is flat cable clamping sleeve, 236 is clamping screw, 237 is cable routing window, 238 is clamping wedge, 239 is lower connector, 240 is set pin, 241 is round nut, 242 is loose nut, 243 is round cable sealing sleeve, and 244 is round cable clamping sleeve. Detailed Implementation

[0024] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0025] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0026] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2As shown in Figures 3 and 4, the hydraulically controlled well-washing valve includes an upper connector 1, a sliding sleeve 2, a central tube 3, a spring 4, and a retaining ring 5. A first outer ring platform 11 is provided on the outer side of the lower end of the upper connector 1. A central tube 3, with its lower end located below it, is fixedly installed on the inner side of the middle part of the upper connector 1. A first inner ring groove 16 and a second inner ring groove 17 are provided sequentially from bottom to top on the inner side of the lower end of the upper connector 1. The inner diameter of the first inner ring groove 16 is larger than the inner diameter of the second inner ring groove 17. A retaining ring 5 is fixedly installed on the outer side of the lower part of the central tube 3, corresponding to the upper connector... A sliding sleeve 2 and a spring 4 are arranged sequentially from top to bottom on the outer side of the central tube 3 between the head 1 and the retaining ring 5. A second outer ring platform 12 and a third outer ring platform 13 are arranged sequentially from top to bottom on the upper outer side of the central tube 3. The outer diameter of the second outer ring platform 12 is larger than the outer diameter of the third outer ring platform 13. The upper end of the second outer ring platform 12 is located below the first inner ring groove 16. A first inner ring platform 14 and a second inner ring platform 15 are arranged sequentially from top to bottom on the inner side of the lower end of the sliding sleeve 2. The inner diameter of the first inner ring platform 14 is larger than the inner diameter of the second inner ring platform 15. The inner diameter of the ring platform 15 is such that the first inner ring platform 14 is located below the second outer ring platform 12, and the second inner ring platform 15 is located below the third outer ring platform 13. The upper side of the first outer ring platform 11 has a first liquid passage hole 21 whose lower end communicates with the second inner ring groove 17. A pushing hole 23 is provided on the outer side of the central tube 3, corresponding to the position between the lower end of the second outer ring platform 12 and the upper end of the first inner ring platform 14. The upper side of the second outer ring platform 12 has a second liquid passage hole 22 whose lower end communicates with the inner end of the pushing hole 23. The second inner ring platform 15 has a corresponding... The outer side of the sliding sleeve 2, located between the second inner ring platform 15 and the third outer ring platform 13, is provided with a pressure relief hole 24 that runs through both the inner and outer sides. The inner side of the upper part of the second inner ring platform 15 is provided with a third inner ring groove 18. The outer side of the lower part of the sliding sleeve 2 is provided with a number of external guide holes 25 that can communicate with the third inner ring groove 18 at intervals along the circumference. The outer side of the middle part of the central tube 3, corresponding to the position between the external guide holes 25 and the spring 4, is provided with an outer ring groove 19. The inner side of the middle part of the central tube 3 is provided with a number of internal guide holes 26 that can communicate with the outer ring groove 19 at intervals along the circumference.During use, the existing hydraulic packer is tightly screwed onto the lower end of the hydraulic wash valve, so that the control fluid capillary is connected to the first through hole 21. According to the design of the rod-type production tubing for a certain well, the hydraulic packer and the hydraulic wash valve are tightly screwed into the correct position in the tubing string during the on-site tubing string operation. During normal oil production, the spring 4 is squeezed by the retaining ring 5 to generate sufficient thrust to overcome the hydrostatic pressure in the capillary, pushing the sliding sleeve 2 to the upper position. At this time, the outer through hole 25 and the inner through hole 26 are not connected, and normal production can be carried out. When hot washing and dewaxing are required... Pressurize the tubing to ensure the hydraulic packer reliably seals the annulus of the tubing. Then pressurize the control fluid capillary. The control fluid enters the cavity formed by the upper connector 1 and the central tube 3 (i.e., the upper end of the second inner annular groove 17, i.e., the upper end of the first inner annular groove 16) through the first fluid passage 21 in the control fluid capillary. After passing through the second fluid passage 22 eccentrically set on the central tube 3, it enters the cavity formed by the sliding sleeve 2 and the central tube 3 (i.e., below the second outer annular platform 12 and above the first inner annular platform 14) through the push hole 23. The control fluid with a certain pressure exerts a downward thrust on the sliding sleeve 2. Overcoming the upward thrust of spring 4 on sliding sleeve 2, sliding sleeve 2 moves downward. The outer through hole 25 on sliding sleeve 2 connects to the inner cavity of the tubing through the third inner annular groove 18 and the inner through hole 26 on the central tube 3, allowing for hot washing and dewaxing operations. At this time, the hot washing liquid sprays out from the outer through hole 25 on sliding sleeve 2, creating a certain negative pressure on the annulus below the outlet, further ensuring that the hydraulic control packer reliably seals the annulus and prevents a large amount of hot washing liquid from entering the reservoir. After the dewaxing operation is completed, the control fluid capillary continues to maintain the previous opening pressure, and the tubing is not... Continue supplying hot wash liquid at a certain pressure, the hydraulic packer drain channel opens, and the remaining small amount of hot wash liquid is discharged into the lower annulus, which will not have a negative impact on the reservoir. After the remaining hot wash liquid is discharged, the control fluid capillary is depressurized, and the spring 4 overcomes the hydrostatic pressure in the capillary, pushing the sliding sleeve 2 upward, so that the sliding sleeve 2 is in the upper position. At this time, the outer through hole 25 and the inner through hole 26 are not connected, and normal oil pumping production can be resumed. The entire process does not move the tubing, effectively solving the problem that existing dewaxing operations cannot be carried out by hot washing and dewaxing without moving the tubing.

[0027] The above-mentioned hydraulically controlled well-washing valve can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1 , 2As shown in Figures 3 and 4, the system also includes O-ring seals 6. At least one O-ring seal 6 is provided vertically between the second outer ring platform 12 and the upper connector 1. At least one O-ring seal 6 is provided vertically between the upper part of the sliding sleeve 2 above the push hole 23 and the second outer ring platform 12. At least one O-ring seal 6 is provided vertically between the first inner ring platform 14 and the third outer ring platform 13 below the push hole 23. At least one O-ring seal 6 is provided vertically between the second inner ring platform 15 above the third inner ring groove 18 and the central tube 3. At least one O-ring seal 6 is provided vertically between the second inner ring platform 15 between the third inner ring groove 18 and the outer ring groove 19 and the central tube 3. At least one O-ring seal 6 is provided vertically between the second inner ring platform 15 below the outer ring groove 19 and the central tube 3. During use, this setup ensures the sealing between components; in addition, it allows the control fluid to pass through the first fluid passage 21, the second fluid passage 22 and the push hole 23, thus driving the sliding sleeve 2 downward.

[0028] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the device also includes guide pins 7. At least two vertically arranged guide grooves 20 are provided circumferentially on the outer side of the center tube 3 at the position above the lower end of the sliding sleeve 2. A guide pin 7, with its inner end located within the upper end of the guide groove 20, is fixedly installed on the outer side of the lower part of the sliding sleeve 2 at each guide groove 20. During use, by setting the guide grooves 20, the guide pins 7 move up and down within them, thus guiding and limiting the movement of the sliding sleeve 2.

[0029] Example 4: As shown in the appendix Figure 1 , 2 As shown in Figures 3 and 4, the lower outer side of the sliding sleeve 2 has two external through holes 25 evenly distributed along the circumference, each of which is inclined with the outer side higher than the inner side. The inner side of the central tube 3 has four internal through holes 26 evenly distributed along the circumference. During use, this arrangement facilitates the ejection of high-temperature hot washing fluid from the external through holes 25, creating a negative pressure in the annulus below, ensuring that the packer below can reliably seal the annulus and prevent a large amount of high-temperature hot washing fluid from entering the reservoir.

[0030] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, it also includes a capillary connector 8, which is fixedly installed on the inner side of the upper end of the first liquid passage 21. During use, this arrangement facilitates the connection between the control liquid capillary and the capillary connector 8, thereby facilitating the control liquid to enter the first liquid passage 21.

[0031] Example 6: As attached Figure 1 , 2As shown in Figures 3 and 4, it also includes a pipe coupling 9, which is fixedly installed on the outer side of the upper end of the upper connector 1. This design facilitates connection to the upper pipe during use.

[0032] Example 7: As attached Figure 1 , 2 As shown in Figures 3 and 4, the device also includes set screws 10. A central tube 3 is fixedly installed on the inner side of the middle part of the upper connector 1 via a threaded connection. A retaining ring 5 is fixedly installed on the outer side of the lower part of the central tube 3 via a threaded connection. At least two set screws 10 are provided at intervals along the circumference of the outer side of the retaining ring 5 to fix it together with the central tube 3. This arrangement facilitates the connection between the various components during use.

[0033] The specific implementation process of the preferred embodiment of the present invention is as follows: (1) Tightly screw the existing hydraulic packer to the lower end of the hydraulic well-washing valve, so that the control fluid capillary is connected to the capillary connector 8. According to the design of the rod production tubing string of a certain well, when running the tubing string on site, tighten the hydraulic packer and the hydraulic well-washing valve to the correct position in the tubing string. (2) During normal oil pumping production, the spring 4 is squeezed by the retaining ring 5 to generate sufficient thrust to overcome the hydrostatic pressure in the capillary tube, pushing the sliding sleeve 2 to the upper position. The guide limit pin 7 is located at the upper end of the guide vertical groove 20 on the central tube 3. At this time, the inner through hole 26 and the outer ring groove 19 set on the central tube 3 are blocked by two sets of O-ring seals 6 and the sliding sleeve 2 to ensure that the normal production tube column does not leak. (3) When hot cleaning and wax removal are required, pressurize the oil pipe to ensure that the hydraulic packer reliably seals the annulus of the oil sleeve. Then pressurize the control fluid capillary connected to the capillary connector 8. The control fluid enters the cavity formed by the upper connector 1 and the central tube 3 (i.e., the upper end of the second inner annular groove 17, i.e., the first inner annular groove 16) through the first liquid passage hole 21 via the control fluid capillary and the capillary connector 8. After passing through the second liquid passage hole 22 eccentrically set on the central tube 3, it enters the cavity formed by the sliding sleeve 2 and the central tube 3 (i.e., below the second outer annular platform 12 and above the first inner annular platform 14) through the push hole 23, and has a certain pressure. The force control fluid applies a downward thrust to the sliding sleeve 2, overcoming the upward thrust of the spring 4 on the sliding sleeve 2. The sliding sleeve 2 moves downward until the guide limit pin 7 moves to the lower end of the guide vertical groove 20 on the central tube 3. The outer through hole 25 on the sliding sleeve 2 communicates with the inner cavity of the tubing column through the third inner ring groove 18 and the inner through hole 26 on the central tube 3, so that hot washing and dewaxing operations can be performed. At this time, after the hot washing liquid is sprayed out from the outer through hole 25 on the sliding sleeve 2, it can form a certain negative pressure on the oil sleeve annulus below the outlet, further ensuring that the hydraulic control packer reliably seals the oil sleeve annulus and prevents a large amount of hot washing liquid from entering the reservoir. (4) After the wax removal operation is completed, the control fluid capillary continues to maintain the previous opening pressure, and the hot washing liquid at a certain pressure is no longer supplied into the tubing. The hydraulic packer drain channel is opened to discharge the remaining small amount of hot washing liquid into the oil jacket annulus below, which will not have a bad impact on the reservoir. (5) After the residual hot washing liquid is drained, the control liquid capillary is depressurized, the spring 4 overcomes the static liquid column pressure in the capillary and pushes the sliding sleeve 2 to move upward, so that the sliding sleeve 2 is in the upper position and the guide limit pin 7 is located at the upper end of the guide vertical groove 20 on the central tube 3. At this time, the inner through hole 26 and the outer ring groove 19 set on the central tube 3 are blocked by two sets of O-ring seals 6 and the sliding sleeve 2, and normal oil pumping production can be carried out again.

[0034] Example 8: As attached Figure 5As shown, the hydraulically controlled cup packer includes a relief valve seat 101, a lower connector 102, a plug 114, a floating piston 113, and a cup assembly. A mounting ring platform 108 is provided on the outer side of the lower end of the relief valve seat 101. Several vertically penetrating relief channels 106 are spaced along the circumference of the mounting ring platform 108. A sealing ring platform 109 is provided on the inner side of the upper part of each relief channel 106. A connecting neck 110 is fixedly installed at the lower end of the mounting ring platform 108 corresponding to the outer position of the relief channel 106. A sealing ring platform 109 is fixedly installed on the inner side of the connecting neck 110, with its upper end connected to the mounting ring platform 108. The lower connector 102, which abuts against the lower side, has a guide hole 111 on the outer side of the connecting neck 110 at the upper position of each discharge channel 106, which can communicate with the corresponding discharge channel 106. The inner side of the upper end of the lower connector 102 has a connecting cone hole 115 that can communicate with the lower end of the discharge channel 106. The connecting cone hole 115 is a frustum shape that is larger at the top and smaller at the bottom. A floating piston 113 is provided in the discharge channel 106, which can block the guide hole 111 after upward movement. A release mechanism is provided in the discharge channel 106 at the position between the sealing ring platform 109 and the floating piston 113. A plug 114 is provided on the upper side of the unblocking spring 112 and the floating piston 113, which is located inside the unblocking spring 112 and can block the discharge channel 106 after rising to the sealing ring platform 109; a cup assembly is installed on the upper outer side of the discharge valve seat 101 corresponding to the position above the mounting ring platform 108; the cup assembly includes a filter cylinder 103, a cup 104 and a support frame 105; a mounting cone hole 116 is provided on the upper side of the mounting ring platform 108, the mounting cone hole 116 is a frustum shape with a larger upper part and a smaller lower part, and a cup 104 is provided inside the mounting cone hole 116. The valve is a cone-shaped valve with a larger upper end and a smaller lower end. The lower inner side of the cup 104 is provided with a fixed ring platform 117. The lower inner side of the fixed ring platform 117 is fixedly installed with a support frame 105. The lower inner side of the support frame 105 is provided with a guide cone hole 118, which is a frustum-shaped hole with a smaller upper end and a larger lower end. The upper outer side of the drain valve seat 101 is provided with a connecting ring platform 119. The lower outer side of the connecting ring platform 119 is fixedly installed with a filter cylinder 103 whose lower end is located inside the cup 104 and abuts against the upper side of the fixed ring platform 117. The filter cylinder 103 is provided with several filter holes 120. During use, the presence of the cup 104 prevents hot washing liquid from entering the annulus below during hot washing and dewaxing. The cup 104 also allows associated gas generated by the well to pass through its outer side during normal pumping production, entering the annulus above it and then flowing into the process pipeline through the side hole of the wellhead device. The system also includes sealing rings 107: at least one sealing ring 107 is provided at intervals on the upper outer side of the floating piston 113, at least one sealing ring 107 is provided at intervals on the lower outer side of the floating piston 113, and at least one sealing ring 107 is provided at intervals between the upper outer side of the lower connector 102 and the connecting neck 110. This configuration allows the floating piston 113 to block the guide hole 111 after it rises during use.

[0035] The specific implementation method of Example 8 is as follows: (1) Install the hydraulic control cup packer below the hydraulic control well washing valve. According to the design of the rod production tubing of a certain well, when running the tubing on site, tighten the hydraulic control cup packer and the hydraulic control well washing valve in the correct position in the tubing; (2) During normal oil production, the hydraulic control well washing valve is closed, there is no liquid in the annulus above the hydraulic control cup packer, and the liquid in the tubing enters the discharge channel 106 through the connecting cone hole 115 set at the upper end of the lower connector 102 and acts on the lower side of the floating piston 113, applying pressure to the floating piston 113. After applying a certain upward force to overcome the elastic force of the unblocking spring 112, push the floating piston 113 upward and push the plug 114 into the sealing ring platform 109, thereby sealing the leakage channel 106. At this time, the associated gas generated by the oil well can pass through the outer side of the hydraulic control cup packer and enter the annulus above the cup packer 104, and then enter the process pipeline through the side hole of the wellhead device; (3) When hot washing and wax removal are required, shut down the pumping unit, close the oil production and transportation pipeline, connect the hot washing pipeline, and first inject a certain pressure of hot washing liquid into the oil pipe through the boiler truck to ensure the floating Piston 113 tightly squeezes plug 114 into sealing ring 109 to block drain channel 106. Then, the ground uses a hand pump or a special hydraulic station to gradually open the hydraulic control well washing valve. The boiler truck continuously supplies hot washing liquid into the tubing. The opened hydraulic control well washing valve connects the tubing cavity with the annulus. The hot washing liquid flows through the tubing cavity into the annulus and returns to the ground from the annulus above the hydraulic control cup packer, thus achieving hot washing and wax removal. (4) After wax removal, the hydraulic control well washing valve is kept open to ensure that the liquid pressure in the tubing and the annulus is equal. Under the elastic force of the unblocking spring 112, the floating piston 113 moves down, the discharge channel 106 opens, and the small amount of remaining hot washing liquid in the annulus above the hydraulic control cup packer enters the area between the filter cylinder 103 and the discharge valve seat 101 through the filter hole 120 provided on the filter cylinder 103, and flows into the discharge channel 106. It then flows from the guide hole 111 into the annulus below the hydraulic control cup packer. After the remaining hot washing liquid in the annulus above the hydraulic control cup packer is discharged, the hydraulic control well washing valve is closed, and normal oil pumping production is restarted.

[0036] Example 8, in conjunction with the hydraulically controlled well-washing valve, can be implemented as follows: (1) Install the hydraulic control cup packer below the hydraulic control well washing valve, so that the control fluid capillary is connected to the capillary connector 8. According to the design of the rod production tubing of a certain well, when running the tubing on site, tighten the hydraulic control cup packer and the hydraulic control well washing valve in the correct position in the tubing. (2) During normal oil pumping production, the spring 4 is squeezed by the retaining ring 5 to generate sufficient thrust to overcome the hydrostatic pressure in the capillary tube, pushing the sliding sleeve 2 to the upper position. The guide limit pin 7 is located at the upper end of the guide vertical groove 20 on the central tube 3. At this time, the inner through hole 26 and the outer ring groove 19 set on the central tube 3 are blocked by two sets of O-ring seals 6 and the sliding sleeve 2 to ensure that the tubing does not leak during normal production. At this time, the hydraulic control well washing valve is closed, and there is no liquid in the annulus above the hydraulic control cup packer. The liquid in the tubing passes through the lower connector 1. The connecting cone hole 115 at the upper end of 02 enters the discharge channel 106 and acts on the lower side of the floating piston 113, applying a certain upward force to the floating piston 113. After overcoming the elastic force of the unblocking spring 112, the floating piston 113 is pushed upward and the plug 114 is pushed into the sealing ring platform 109, thereby sealing the discharge channel 106. At this time, the associated gas generated by the oil well can pass through the outer side of the hydraulic control cup packer and enter the annulus above the cup packer 104, and then enter the process pipeline through the side hole of the wellhead device. (3) When hot washing and dewaxing are required, shut down the pumping unit, close the oil production and delivery pipeline, connect the hot washing pipeline, and first inject a certain pressure of hot washing liquid into the oil pipe through the boiler truck to ensure that the floating piston 113 tightly squeezes the plug 114 into the sealing ring platform 109 to seal the discharge channel 106, and ensure that the hydraulic control cup packer reliably seals the annulus of the oil casing. Then, the ground uses a hand pump or a special hydraulic station to pressurize the control fluid capillary tube connected to the capillary tube joint 8, and gradually opens the hydraulic control well washing valve. The control fluid enters the cavity formed by the upper joint 1 and the central tube 3 (i.e., the second inner annular groove 17, i.e. the upper end of the first inner annular groove 16) through the first liquid passage hole 21 via the control fluid capillary tube and the capillary tube joint 8, and then passes through the second liquid passage hole eccentrically set on the central tube 3. After 22, the fluid enters the cavity formed by the sliding sleeve 2 and the central tube 3 through the push hole 23 (i.e., below the second outer ring platform 12 and above the first inner ring platform 14). The control fluid with a certain pressure applies a downward thrust to the sliding sleeve 2, overcoming the upward thrust of the spring 4 on the sliding sleeve 2. The sliding sleeve 2 moves down until the guide limit pin 7 moves to the lower end of the guide vertical groove 20 on the central tube 3. The outer guide hole 25 on the sliding sleeve 2 communicates with the inner cavity of the tubing string through the third inner ring groove 18 and the inner guide hole 26 on the central tube 3. The boiler truck continuously supplies hot washing fluid into the tubing. The opened hydraulic control well washing valve connects the inner cavity of the tubing with the annulus. The hot washing fluid flows through the inner cavity of the tubing into the annulus and returns to the surface from the annulus above the hydraulic control cup packer, thus achieving hot washing and wax removal. (4) After the dewaxing is completed, keep the hydraulic control well washing valve in the open position to ensure that the fluid pressure in the tubing and the annulus is balanced. Under the elastic force of the unblocking spring 112, the floating piston 113 moves down, the discharge channel 106 opens, and the small amount of hot washing fluid remaining in the annulus above the hydraulic control cup packer enters the area between the filter cylinder 103 and the discharge valve seat 101 through the filter hole 120 set on the filter cylinder 103, and flows into the discharge channel 106, and flows into the hydraulic control cup from the guide hole 111. After the remaining hot wash fluid in the annulus above the hydraulic control cup packer is drained from the annulus below the packer, the control fluid capillary is depressurized. The spring 4 overcomes the hydrostatic pressure in the capillary and pushes the sliding sleeve 2 upward, so that the sliding sleeve 2 is in the upper position. The guide limit pin 7 is located at the upper end of the guide vertical groove 20 on the central tube 3. At this time, the inner through hole 26 and the outer annular groove 19 set on the central tube 3 are blocked by two sets of O-ring seals 6 and the sliding sleeve 2. The hydraulic control well washing valve is closed, and normal oil pumping production is restarted.

[0037] Example 9: As attached Figure 6 , 7As shown, the cable-controlled hydraulic packer includes a conversion connector 201, a connector 202, a retaining ring 203, an eccentric connecting neck 204, a hydraulic cylinder 205, a rubber sleeve assembly 214, and a tensioning assembly. A retaining ring 203 is fixedly installed on the outer side of the upper end of the connector 202. A conversion connector 201, with its upper end positioned above the connector 202, is fixedly installed on the outer side of the retaining ring 203. A mounting plate 206 is provided on the inner side of the middle of the conversion connector 201. An eccentrically oriented liquid-passing eccentric hole 207 is eccentrically provided on the connector 202. An eccentric mounting hole is provided on the mounting plate 206 corresponding to the position of the liquid-passing eccentric hole 207. An eccentric connecting neck 204, with its upper end positioned within the mounting eccentric hole, is fixedly installed on the upper side of the connector 202 corresponding to the position of the liquid-passing eccentric hole 207. A hydraulic cylinder ring platform 208 is provided on the outer side of the upper part of the connector 202. A hydraulic hole 205 is provided on the outer side of the upper part of the connector 202 corresponding to the position above the hydraulic cylinder ring platform 208. A hydraulic hole 205 is provided on the outer side of the upper part of the connector 205. The connector 202 at the inner end of 09 has a hydraulic blind hole 210 on its upper side that can communicate with its lower end. The connector 202 has a connecting ring groove 211 on its lower outer side. The connector 202 at the position above the connecting ring groove 211 has a cable outlet hole 212 on its lower outer side. The connector 202 at the inner end of the cable outlet hole 212 has a cable routing blind hole 213 on its upper side that can communicate with its lower end. The adapter 201 has a rubber sleeve assembly 214 fixedly installed on its lower inner side. The rubber sleeve assembly 214 has a hydraulic cylinder 205 fixedly installed on its lower outer side. The hydraulic cylinder 205 has a push ring platform 215 on its upper side of the hydraulic cylinder ring platform 208 on its middle inner side. The push ring platform 215 has a push ring groove on its lower inner side. The hydraulic cylinder 205 has a tensioning component that can pull the hydraulic cylinder 205 downward. The tensioning component at the position of the cable outlet hole 212 has a cable routing vertical groove 216 with an opening facing downward on its lower outer side.The tensioning assembly includes a connecting sleeve 217, an upper support ring 218, an upper spring 219, a bushing 220, a pressure cap 221, a spring seat 222, a lower support ring 223, a lower spring 224, and a drag screw 225. A connecting sleeve 217 is fixedly installed on the outer side of the lower end of the hydraulic cylinder 205. A pressure cap 221 is fixedly installed on the inner side of the lower end of the connecting sleeve 217. A bushing 220 is located on the inner side of the pressure cap 221, with its upper end positioned above it. A bushing ring platform 226, seated on the upper outer side of the bushing 220, is located on the upper outer side of the pressure cap 221. A spring seat 222, with its lower end located on the outer side of the middle of the connecting ring groove 211, is fixedly installed on the outer side of the lower part of the bushing 220 by the drag screw 225. A support ring platform 227 is located on the inner side of the lower end of the spring seat 222. A downward-opening vertical groove 216 is located on the outer side of the lower end of the spring seat 222 corresponding to the position of the cable outlet 212. A connecting body 202, corresponding to the position below the hydraulic cylinder ring platform 208, is located on the outer side of the connecting body 202. An upper support ring 218 is provided on the side within the connecting sleeve 217. An upper spring 219 is provided on the outside of the connecting body 202 corresponding to the position between the upper support ring 218 and the bushing 220. A lower support ring 223 is fixedly installed on the outside of the connecting body 202 corresponding to the position at the upper end of the connecting ring groove 211. A lower spring 224 is provided on the outside of the connecting body 202 corresponding to the position between the lower support ring 223 and the support ring platform 227. The tensioning assembly also includes a guide limiting pin 228. At least one guide vertical groove 229 is provided circumferentially on the outside of the connecting body 202 corresponding to the middle position of the bushing 220. An inner mounting hole is provided on the outer side of the middle part of the bushing 220 corresponding to the lower part of each guide vertical groove 229. An outer mounting hole is provided on the outer side of the lower part of the pressure cap 221 corresponding to each inner mounting hole. A guide limiting pin 228 with its outer end located in the outer mounting hole and its inner end located at the lower part of the guide vertical groove 229 is provided in the inner mounting hole. During use, the guide groove 229 guides and limits the upward and downward movement of the bushing 220, pressure cap 221, and spring seat 222. It also includes O-ring seals 230, with at least one O-ring seal 230 spaced vertically between the push ring platform 215 above the push ring groove and the connecting body 202, and at least one O-ring seal 230 spaced vertically between the hydraulic cylinder ring platform 208 and the hydraulic cylinder 205. Furthermore, it includes a capillary tube sleeve 231, with vertically spaced... It has an inlet hole 232 and a hydraulic window 233. A capillary sleeve 231 is fixedly installed on the inner side of the upper end of the hydraulic blind hole 210. A wiring window 237 is provided on the outer side of the conversion connector 201 above the wiring blind hole 213. It also includes a round cable sealing sleeve 243 and a round cable clamping sleeve 244. The wiring blind hole 213 is a round hole. A sealing installation ring groove is provided on the inner side of the upper end of the wiring blind hole 213. A round cable sealing sleeve 243 is provided at the bottom of the sealing installation ring groove. A round cable clamping sleeve 244 with its lower end abutting against the upper side of the round cable sealing sleeve 243 is fixedly installed on the upper part of the sealing installation ring groove.It also includes a flat cable sealing sleeve 244, a flat cable clamping sleeve 235, and a clamping screw 236. The cable routing blind hole 213 is an elongated hole. A sealing installation groove is provided on the inner side of the upper end of the cable routing blind hole 213. A flat cable sealing sleeve 244 is provided at the bottom of the sealing installation ring groove. A round cable clamping sleeve 244 with its lower end abutting against the upper side of the round cable sealing sleeve 243 is installed on the upper part of the sealing installation groove. A clamping wedge 238 is provided on the outer side of the upper end of the round cable clamping sleeve 244. A clamping opening is provided on the outer side of the adapter 201 corresponding to the position of the clamping wedge 238. A clamping screw 236 with its inner lower end abutting against the upper side of the clamping wedge 238 is fixedly installed in the clamping opening. It also includes a lower connector 239 and a locking mechanism. A screw 240, a round nut 241, and a slipknot nut 242 are provided. A round nut 241 is threadedly fixed to the lower outer side of the connecting body 202, corresponding to the middle position of the connecting ring groove 211. A slipknot nut 242 is provided outside the round nut 241. An inner ring platform is provided on the inner side of the upper end of the slipknot nut 242, and the lower side of the inner ring platform sits on the upper side of the round nut 241. A lower connector 239, located on the outer side of the lower end of the connecting body 202, is threadedly fixed to the inner side of the lower end of the slipknot nut 242. The round nut 241 and the connecting body 202 are fixed together by a set screw 240, and the slipknot nut 242 and the lower connector 239 are fixed together by a set screw 240.

[0038] The specific implementation method of Example 9 is as follows: During on-site construction, the cable sealing sleeve and cable sealing clamping sleeve are first placed on the power cable. Then, the power cable is passed through the cable hydraulic control packer from the blind hole 213, the outlet hole 212, and the vertical groove 216, and connected to the motor of the submersible pump or downhole screw pump. During normal pumping operations, according to the construction process, the power cable and tubing string must be tied together with cable clamps at each interval. At the same time as pumping, a designated person must be responsible for pulling the power cable out of the cable hydraulic control packer. When the tubing string is lowered to the point where the cable hydraulic control packer needs to be installed, the lower connector 239 is screwed into the tubing string. During the tightening process, it is ensured that the cable hydraulic control packer and the power cable do not twist. Then, the cable sealing sleeve is tightened. The sealing sleeve and cable sealing clamping sleeve are installed on the upper end of the connector 202 through the cable routing window 237. The cable sealing sleeve is pressed with the cable clamping sleeve to seal the cable routing blind hole 213. Then, the capillary tube is inserted into the hydraulic blind hole 210 through the inlet hole 232 and sealed with the capillary tube clamp 231. The capillary tube is installed on the upper end of the connector 202 through the hydraulic window 233 to introduce hydraulic oil into the hydraulic cylinder 205. The hydraulic control well washing valve is screwed to the upper end of the conversion joint 201 and connected together with the cable hydraulic control packer. The hydraulic control well washing valve inlet capillary tube and the cable hydraulic control packer inlet capillary tube are connected to the main inlet capillary tube through the clamp tee. The tubing string insertion operation is completed according to the construction process. The power cable is connected to the power supply, and the main inlet capillary tube is connected to the main inlet capillary tube. (2) During normal oil production, the hydraulic control well washing valve is closed, there is no liquid in the annulus above the hydraulic control packer of the cable, the pressure of the capillary tube is balanced with the tension of the upper spring 219 and the lower spring 224, the tension of the upper spring 219 and the lower spring 224 pulls the hydraulic cylinder 205 to prevent the hydraulic cylinder 205 from moving upward to set the rubber sleeve assembly 214. At this time, the associated gas generated by the oil well can enter the process pipeline from the annulus; (3) When hot washing and wax removal are required, turn off the power of the submersible electric pump or the downhole screw pump, pressurize with the hand pump, open the hydraulic control well washing valve, shut down the pumping unit, shut down the oil production and transportation pipeline, connect the hot washing pipeline, and first inject a certain pressure of hot washing liquid into the oil pipe through the boiler truck. Under the action of the control fluid, the hydraulic packer overcame the tension of the spring, and the hydraulic cylinder 205 moved upward to squeeze the rubber sleeve assembly 214, sealing the annulus. The boiler truck continuously supplied hot washing liquid into the oil pipe, and the opened hydraulic washing valve connected the inner cavity of the oil pipe with the annulus. The hot washing liquid flowed through the inner cavity of the oil pipe into the annulus and returned to the ground from the annulus above the hydraulic packer, thus achieving hot washing and wax removal. (4) After the wax removal was completed, the hand pump was depressurized, the spring tension balanced the hydrostatic column pressure in the capillary, the hydraulic washing valve was closed, and the rubber sleeve assembly 214 on the hydraulic packer was restored to achieve unsealing. The annulus was unblocked again, and the associated gas entered the ground process pipeline normally from the annulus, continuing normal production.

[0039] Example 9, in conjunction with the hydraulically controlled well-washing valve, can be implemented as follows: (1) During on-site construction, the cable sealing sleeve and cable sealing clamping sleeve should first be placed on the power cable. Then, the power cable should be passed through the cable hydraulic control packer from the blind hole 213, the outlet hole 212 and the vertical groove 216, and connected to the motor of the submersible pump or downhole screw pump. During normal pumping operations, the power cable should be tied to the tubing string with cable clamps at each interval according to the construction process. At the same time as pumping, a person should be responsible for pulling the power cable out of the cable hydraulic control packer. When the tubing string is lowered to the point where the cable hydraulic control packer needs to be installed, the lower connector 239 should be screwed into the tubing string. During the screwing process, ensure that the cable hydraulic control packer and the power cable do not twist. Then, the cable sealing sleeve and cable sealing clamping sleeve should be passed through the cable hydraulic control packer. The cable routing window 237 is installed on the upper end of the connector 202. The cable sealing sleeve is pressed with the cable clamping sleeve to seal the cable routing blind hole 213. Then, the capillary tube is inserted from the inlet hole 232 into the hydraulic blind hole 210 and sealed with the capillary tube clamp 231. The hydraulic window 233 is installed on the upper end of the connector 202 to introduce hydraulic oil into the hydraulic cylinder 205. The hydraulic control well washing valve is screwed to the upper end of the conversion joint 201 and connected together with the cable hydraulic control packer. The hydraulic control well washing valve inlet capillary tube and the cable hydraulic control packer inlet capillary tube are connected to the main inlet capillary tube through the clamp tee. Continue to complete the tubing string insertion operation according to the construction process. The power cable is connected to the power supply. The main inlet capillary tube is connected to the hand pump, and normal production can be carried out. (2) During normal oil pumping production, the spring 4 is squeezed by the retaining ring 5 to generate sufficient thrust to overcome the hydrostatic pressure in the capillary tube and push the sliding sleeve 2 to the upper position. The guide limit pin 7 is located at the upper end of the guide vertical groove 20 on the central tube 3. At this time, the inner through hole 26 and outer ring groove 19 set on the central tube 3 are blocked by two sets of O-ring seals 6 and the sliding sleeve 2 to ensure that the normal production tubing does not leak. At this time, the hydraulic control well washing valve is closed, and there is no liquid in the annulus above the hydraulic control packer of the cable. The pressure of the capillary tube is balanced with the tension of the upper spring 219 and the lower spring 224. The tension of the upper spring 219 and the lower spring 224 pulls the hydraulic cylinder 205 to prevent the hydraulic cylinder 205 from moving upward to set the rubber sleeve assembly 214. At this time, the associated gas generated by the oil well can enter the process pipeline from the annulus. (3) When hot washing and dewaxing are required, turn off the power of the submersible pump or downhole screw pump, pressurize with a hand pump, and gradually open the hydraulic control well washing valve. The control fluid enters the cavity formed by the upper connector 1 and the central tube 3 through the first fluid passage hole 21 via the control fluid capillary tube and capillary connector 8 (i.e., the upper end of the second inner annular groove 17, i.e. the first inner annular groove 16). After passing through the second fluid passage hole 22 eccentrically set on the central tube 3, it enters the cavity formed by the sliding sleeve 2 and the central tube 3 through the push hole 23 (i.e., below the second outer annular platform 12 and above the first inner annular platform 14). The control fluid with a certain pressure applies a downward thrust to the sliding sleeve 2, overcoming the upward thrust of the spring 4 on the sliding sleeve 2. The sliding sleeve 2 descends until the guide limit pin 7 moves to the lower end of the guide vertical groove 20 on the central tube 3. The outer through hole 25 on the sliding sleeve 2 communicates with the inner cavity of the tubing string through the third inner ring groove 18 and the inner through hole 26 on the central tube 3. Under the action of the control fluid, the cable hydraulic control packer overcomes the tension of the spring. The hydraulic cylinder 205 moves upward to squeeze the rubber sleeve assembly 214 and seal the annulus. The boiler truck continuously supplies hot washing liquid into the tubing. The opened hydraulic control well washing valve connects the inner cavity of the tubing with the annulus. The hot washing liquid flows through the inner cavity of the tubing into the annulus and returns to the ground through the annulus above the cable hydraulic control packer, thus achieving hot washing and dewaxing. (4) After the wax removal is completed, the hand pump is depressurized and the control fluid capillary is depressurized. The spring 4 overcomes the static pressure in the capillary and pushes the sliding sleeve 2 to move upward, so that the sliding sleeve 2 is in the upper position. The guide limit pin 7 is located at the upper end of the guide vertical groove 20 on the central tube 3. At this time, the inner through hole 26 and the outer ring groove 19 set on the central tube 3 are blocked by two sets of O-ring seals 6 and the sliding sleeve 2. The hydraulic control well washing valve is closed, the spring tension balances the static pressure in the capillary, and the rubber sleeve assembly 214 on the hydraulic control packer of the cable is restored to achieve unsealing. The oil casing annulus is unblocked again, and the associated gas enters the surface process pipeline normally from the oil casing annulus to continue normal production.

[0040] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A hydraulically controlled well-washing valve, characterized in that... The system includes an upper connector, a sliding sleeve, a central tube, a spring, and a retaining ring. The lower outer side of the upper connector has a first outer ring platform. A central tube, with its lower end below it, is fixedly installed on the inner side of the middle portion of the upper connector. From bottom to top, the inner side of the lower end of the upper connector has a first inner ring groove and a second inner ring groove, with the inner diameter of the first inner ring groove being larger than that of the second inner ring groove. A retaining ring is fixedly installed on the lower outer side of the central tube. Corresponding to the position between the upper connector and the retaining ring, from top to bottom, a sliding sleeve and a spring are arranged on the outer side of the central tube. From top to bottom, the upper outer side of the central tube has a second outer ring platform and a third outer ring platform, with the outer diameter of the second outer ring platform being larger than that of the third outer ring platform. The upper end of the second outer ring platform is located below the first inner ring groove. From top to bottom, the inner side of the lower end of the sliding sleeve has a first inner ring platform and a second inner ring platform, with the inner diameter of the first inner ring platform being larger than that of the second inner ring platform. The inner diameter of the first inner ring platform is located below the second outer ring platform, and the second inner ring platform is located below the third outer ring platform. The upper side of the first outer ring platform is provided with a first liquid passage hole whose lower end is connected to the second inner ring groove. The outer side of the central tube corresponding to the position between the lower end of the second outer ring platform and the upper end of the first inner ring platform is provided with a push hole. The upper side of the second outer ring platform is provided with a second liquid passage hole whose lower end is connected to the inner end of the push hole. The outer side of the sliding sleeve corresponding to the position between the second inner ring platform and the third outer ring platform is provided with a pressure relief hole that is connected to both the inner and outer sides. The inner side of the upper part of the second inner ring platform is provided with a third inner ring groove. The outer side of the lower part of the sliding sleeve is provided with several external guide holes that can communicate with the third inner ring groove at intervals along the circumference. The outer side of the middle part of the central tube corresponding to the position between the external guide holes and the spring is provided with an outer ring groove. The inner side of the middle part of the central tube is provided with several internal guide holes that can communicate with the outer ring groove at intervals along the circumference.

2. The hydraulically controlled well-washing valve according to claim 1, characterized in that... It also includes O-ring seals. At least one O-ring seal is provided vertically between the second outer ring platform and the upper connector. At least one O-ring seal is provided vertically between the upper part of the sliding sleeve above the push hole and the second outer ring platform. At least one O-ring seal is provided vertically between the first inner ring platform and the third outer ring platform below the push hole. At least one O-ring seal is provided vertically between the second inner ring platform above the third inner ring groove and the central tube. At least one O-ring seal is provided vertically between the second inner ring platform and the central tube at the position between the third inner ring groove and the outer ring groove. At least one O-ring seal is provided vertically between the second inner ring platform and the central tube at the position below the outer ring groove.

3. The hydraulically controlled well-washing valve according to claim 1 or 2, characterized in that... It also includes guide pins. At least two vertical guide grooves are provided on the outer side of the center tube at the position above the lower end of the slide sleeve along the circumference. A guide pin with its inner end located inside the upper end of the guide groove is fixedly installed on the outer side of the lower part of the slide sleeve at the position of each guide groove.

4. The hydraulically controlled well-washing valve according to claim 1 or 2, characterized in that... Two external through holes are evenly distributed along the circumference on the lower outer side of the sliding sleeve. Each external through hole is inclined with the outer side higher than the inner side. Four internal through holes are evenly distributed along the circumference on the inner side of the middle part of the central tube.

5. The hydraulically controlled well-washing valve according to claim 3, characterized in that... Two external through holes are evenly distributed along the circumference on the lower outer side of the sliding sleeve. Each external through hole is inclined with the outer side higher than the inner side. Four internal through holes are evenly distributed along the circumference on the inner side of the middle part of the central tube.

6. The hydraulically controlled well-washing valve according to claim 1, 2, or 5, characterized in that... It also includes a capillary connector, which is fixedly installed on the inner side of the upper end of the first liquid passage.

7. The hydraulically controlled well-washing valve according to claim 3, characterized in that... It also includes a capillary connector, which is fixedly installed on the inner side of the upper end of the first liquid passage.

8. The hydraulically controlled well-washing valve according to claim 4, characterized in that... It also includes a capillary connector, which is fixedly installed on the inner side of the upper end of the first liquid passage.

9. The hydraulically controlled well-washing valve according to claim 1, 2, 5, 7, or 8, characterized in that... It also includes a tubing coupling, with a tubing coupling fixedly installed on the outer side of the upper end of the upper connector; or / and includes set screws, with a central tube fixedly installed on the inner side of the middle part of the upper connector by a threaded connection, and a retaining ring fixedly installed on the outer side of the lower part of the central tube by a threaded connection, with at least two set screws spaced circumferentially on the outer side of the retaining ring to fix it together with the central tube.

10. The hydraulically controlled well-washing valve according to claim 6, characterized in that... It also includes a tubing coupling, with a tubing coupling fixedly installed on the outer side of the upper end of the upper connector; or / and includes set screws, with a central tube fixedly installed on the inner side of the middle part of the upper connector by a threaded connection, and a retaining ring fixedly installed on the outer side of the lower part of the central tube by a threaded connection, with at least two set screws spaced circumferentially on the outer side of the retaining ring to fix it together with the central tube.

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