Cable-controlled packer

Abstract

This invention relates to the field of well cleaning technology, specifically a hydraulically controlled packer for cable conveying. It includes a conversion connector, a connecting body, a retaining ring, an eccentric connecting neck, a hydraulic cylinder, a rubber sleeve assembly, and a tensioning assembly. A retaining ring is fixedly installed on the outer side of the upper end of the connecting body, and a conversion connector, with its upper end positioned above the connecting body, is fixedly installed on the outer side of the retaining ring. This invention features a reasonable and compact structure, is easy to use, and under normal pumping conditions, the capillary pressure is balanced by the tension of the upper and lower springs. The tension of the upper and lower springs holds the hydraulic cylinder in place, preventing the cylinder from moving upwards and causing the rubber sleeve assembly to set. During wax washing, the capillary pressure exceeds the tension of the upper and lower springs, causing the hydraulic cylinder to move upwards and compress the rubber sleeve assembly to set. After wax washing, the capillary pressure balances with the tension of the upper and lower springs, and under the action of the upper and lower springs, the hydraulic cylinder is pulled downwards, and the rubber sleeve assembly returns to its stretched state, completing the unsealing process. This invention is characterized by stability, reliability, and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of well cleaning technology, and is a hydraulically controlled packer via cable. Background Technology

[0002] In crude oil production, according to the geothermal gradient map of each wellbore, the temperature is higher at deeper levels, making it less prone to wax formation. When crude oil moves 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 adopt various wax removal measures to clean the inner walls of the tubing, with hot washing being the most common process. In rod-based production systems, hot washing can be performed using a hollow sucker rod and a well-washing check valve. In rodless production systems such as submersible electric pumps or downhole screw pumps, hot washing can be performed by running a smaller diameter coiled tubing inside the tubing. Due to the high cost of using coiled tubing, some oil and gas producers have adopted a hydraulically controlled well-washing valve to control the opening and closing of the casing-oil communication channel for hot washing. The hydraulically controlled well-washing valve is connected to a surface hand pump via a capillary tube and is closed during normal production. When hot washing and dewaxing are required, the hydraulically controlled well washing valve is opened by pressurizing a hand pump on the surface before hot washing and dewaxing. After dewaxing is completed, the hand pump is depressurized, the hydraulically controlled well washing valve is closed, and normal production can resume. During normal production, in order to improve pump efficiency, associated gas needs to be discharged to the surface process pipeline through the annulus. A packer cannot be used to isolate the annulus. Using a hydraulically controlled well washing valve for hot washing and dewaxing would cause a large amount of washing fluid to enter the reservoir, requiring a long time to restore normal production. This not only wastes washing fluid but also causes serious reservoir pollution, resulting in significant losses.

[0003] Patent document CN202228039U discloses a ground-based hydraulically controlled cable packer, comprising a lower fixing device and an upper sealing device connected by a short section. Both the fixing and sealing devices are connected to a ground pressure control device via hydraulic lines, which control the fixing and sealing devices through these lines. The sealing device includes a fixed stop ring and a hydraulic cylinder. A piston gauge ring located outside the cylinder body is mounted on the piston of the hydraulic cylinder. An upper ring gauge and a rubber sleeve are clamped between the piston gauge ring and the fixed stop ring, with the rubber sleeve adjacent to the piston gauge ring. The piston and cylinder body of the hydraulic cylinder are connected by a pin. The fixing device includes an anchor body with several symmetrically arranged hydraulic anchors radially arranged on it. A pressure plate fixed to the anchor body is mounted on top of each hydraulic anchor, and a spring is clamped between the pressure plate and the hydraulic anchors. The ground pressure control device includes a submerged check valve. This cable packer... Summary of the Invention

[0004] This invention provides a hydraulically controlled packer for cable-operated wells, which overcomes the shortcomings of the prior art and can effectively solve the problem of preventing the well-washing fluid from entering the reservoir when using a hydraulically controlled well-washing valve for hot washing and dewaxing.

[0005] The technical solution of this invention is achieved through the following measures: A hydraulically controlled packer for cable transfer includes a conversion connector, a connecting body, a fixing ring, an eccentric connecting neck, a hydraulic cylinder, a rubber sleeve assembly, and a tensioning assembly. A fixing ring is fixedly installed on the outer side of the upper end of the connecting body. A conversion connector with its upper end located above the connecting body is fixedly installed on the outer side of the fixing ring. A mounting plate is provided on the inner side of the middle of the conversion connector. An eccentrically oriented liquid-passing hole is eccentrically provided on the connecting body, and an eccentric mounting hole is provided on the mounting plate corresponding to the position of the liquid-passing eccentric hole. An eccentric connecting neck with its upper end located within the mounting eccentric hole is fixedly installed on the upper side of the connecting body corresponding to the position of the liquid-passing eccentric hole. A hydraulic cylinder ring platform is provided on the outer side of the upper part of the connecting body, and a hydraulic cylinder ring platform is provided on the outer side of the upper part of the connecting body corresponding to the position above the hydraulic cylinder ring platform. The connector has a hydraulic blind hole on its upper side corresponding to the inner end of the hydraulic hole, which can communicate with the lower end of the connector. The lower outer side of the connector has a connecting ring groove. The lower outer side of the connector above the connecting ring groove has a cable outlet hole. The upper side of the connector corresponding to the inner end of the cable outlet hole has a cable routing blind hole on its lower end that can communicate with the cable routing blind hole. A rubber sleeve assembly located on the upper outer side of the connector is fixedly installed on the lower inner side of the adapter. A hydraulic cylinder is fixedly installed on the lower outer side of the rubber sleeve assembly. A push ring platform located on the upper side of the hydraulic cylinder ring platform is located on the middle inner side of the hydraulic cylinder. A push ring groove is located on the lower inner side of the push ring platform. A tensioning component that can pull the hydraulic cylinder downward is fixedly installed on the lower outer side of the hydraulic cylinder. A cable routing vertical groove with an opening downward is located on the lower outer side of the tensioning component corresponding to the cable outlet hole.

[0006] The following are further optimizations and / or improvements to the above-mentioned technical solution: The aforementioned tensioning assembly may include a connecting sleeve, an upper support ring, an upper spring, a bushing, a pressure cap, a spring seat, a lower support ring, a lower spring, and a drag screw. A connecting sleeve is fixedly installed on the outer side of the lower end of the hydraulic cylinder. A pressure cap is fixedly installed on the inner side of the lower end of the connecting sleeve. A bushing with its upper end positioned above the pressure cap is provided on the inner side of the pressure cap. A bushing ring platform is provided on the outer side of the upper end of the bushing, which sits on the upper side of the pressure cap. A spring seat with its lower end positioned on the outer side of the middle of the connecting ring groove is fixedly installed on the outer side of the lower part of the bushing by a drag screw. A support ring platform is provided on the inner side of the lower end of the spring seat. A vertical groove for wiring with an opening facing downwards is provided on the outer side of the lower end of the spring seat corresponding to the position of the cable outlet hole. An upper support ring is provided on the outer side of the connecting body located inside the connecting sleeve, corresponding to the position between the upper support ring and the bushing. A lower support ring is fixedly installed on the outer side of the connecting body corresponding to the position at the upper end of the connecting ring groove. A lower spring is provided on the outer side of the connecting body corresponding to the position between the lower support ring and the support ring platform.

[0007] The aforementioned tensioning assembly may further include guide pins. At least one guide groove is provided circumferentially on the outer side of the connecting body corresponding to the middle position of the bushing. An inner mounting hole is provided on the outer side of the middle of the bushing corresponding to the lower position of each guide groove. An outer mounting hole is provided on the outer side of the lower part of the pressure cap corresponding to each inner mounting hole. A guide pin is provided in the inner mounting hole with its outer end located in the outer mounting hole and its inner end located at the lower part of the guide groove.

[0008] The above may also include O-rings, with at least one O-ring spaced vertically between the push ring platform and the connecting body at the position above the push ring groove, and at least one O-ring spaced vertically between the cylinder ring platform and the cylinder.

[0009] The above may also include a capillary sleeve, with an inlet hole and a hydraulic window spaced at intervals on the outer side of the conversion joint corresponding to the position above the hydraulic blind hole, and a capillary sleeve fixedly installed on the inner side of the upper end of the hydraulic blind hole.

[0010] A wiring opening may be provided on the outside of the adapter above the corresponding blind hole for wiring.

[0011] The above may also include a round cable sealing sleeve and a round cable clamping sleeve. The cable routing blind hole is a round hole. A sealing installation ring groove is provided on the inner side of the upper end of the cable routing blind hole. A round cable sealing sleeve is provided at the bottom of the sealing installation ring groove. A round cable clamping sleeve with its lower end abutting against the upper side of the round cable sealing sleeve is fixedly installed on the upper part of the sealing installation ring groove.

[0012] The above may also include a flat cable sealing sleeve, a flat cable clamping sleeve, and a clamping screw. The cable routing blind hole is an elongated hole. A sealing installation groove is provided on the inner side of the upper end of the cable routing blind hole. A flat cable sealing sleeve is provided at the bottom of the sealing installation ring groove. A round cable clamping sleeve with its lower end abutting against the upper side of the round cable sealing sleeve is installed on the upper part of the sealing installation groove. A clamping wedge is provided on the outer side of the upper end of the round cable clamping sleeve. A clamping opening is provided on the outer side of the conversion connector corresponding to the position of the clamping wedge. A clamping screw with its inner lower end abutting against the upper side of the clamping wedge is fixedly installed in the clamping opening.

[0013] The above may also include a lower connector, a set screw, a round nut, and a loose nut. A round nut is fixedly installed on the lower outer side of the connecting body corresponding to the middle position of the connecting ring groove by a threaded connection. A loose nut is provided on the outer side of the round nut. An inner ring platform is provided on the inner side of the upper end of the loose nut. The lower side of the inner ring platform sits on the upper side of the round nut. A lower connector located on the outer side of the lower end of the connecting body is fixedly installed on the inner side of the lower end of the loose nut by a threaded connection. The round nut and the connecting body are fixed together by a set screw. The loose nut and the lower connector are fixed together by a set screw.

[0014] This invention features a reasonable and compact structure, and is easy to use. Under normal oil extraction conditions, the pressure of the capillary tube is balanced with the tension of the upper and lower springs. The tension of the upper and lower springs holds the liquid cylinder in place, preventing the liquid cylinder from moving upwards and causing the rubber sleeve assembly to set. During the wax washing process, the capillary tube pressure is greater than the tension of the upper and lower springs, causing the liquid cylinder to move upwards and compress the rubber sleeve assembly to set. After the wax washing is completed, the capillary tube pressure is balanced with the tension of the upper and lower springs. Under the action of the upper and lower springs, the liquid cylinder is pulled downwards, and the rubber sleeve assembly returns to its stretched state, completing the unsealing process. This invention is characterized by stability, reliability, and high efficiency. Attached Figure Description

[0015] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of Examples 1 to 9.

[0016] Appendix Figure 2 For the appendix Figure 1 A top-down enlarged structural diagram.

[0017] Appendix Figure 3 For the appendix Figure 2 A schematic diagram of the front sectional view at point AA.

[0018] Appendix Figure 4 For the appendix Figure 1 Enlarged front view sectional diagram of the connecting body.

[0019] Appendix Figure 5 This is a partially enlarged structural diagram of Example 7.

[0020] Appendix Figure 6 This is a partially enlarged structural diagram of Example 8.

[0021] Appendix Figure 7 This is a schematic diagram of the main cross-sectional structure of the hydraulic control well-washing valve in Examples 1 to 10.

[0022] Appendix Figures 1 to 6The 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.

[0023] Appendix Figure 7 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. 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, 4, 5, and 6, the cable-operated hydraulic packer includes a conversion connector 201, a connecting body 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 connecting body 202. A conversion connector 201, with its upper end positioned above the connecting body 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 connecting body 202, penetrating vertically. 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 eccentric mounting hole, is fixedly installed on the upper side of the connecting body 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 connecting body 202. A hydraulic hole 209 is provided on the outer side of the upper part of the connecting body 202 corresponding to the position above the hydraulic cylinder ring platform 208. The upper side of the connector 202 at the inner end of the hydraulic hole 209 is provided with a hydraulic blind hole 210 that can communicate with it at the lower end. The lower outer side of the connector 202 is provided with a connecting ring groove 211. The lower outer side of the connector 202 above the connecting ring groove 211 is provided with a cable outlet hole 212. The upper side of the connector 202 at the inner end of the cable outlet hole 212 is provided with a cable routing blind hole 213 that can communicate with it at the lower end. The inner side of the lower end of the adapter 201 is fixedly installed with a rubber sleeve assembly 214 located on the upper outer side of the connector 202. The outer side of the lower end of the rubber sleeve assembly 214 is fixedly installed with a hydraulic cylinder 205. The inner side of the middle part of the hydraulic cylinder 205 is provided with a push ring platform 215 located on the upper side of the hydraulic cylinder ring platform 208. The inner side of the lower end of the push ring platform 215 is provided with a push ring groove. The outer side of the lower end of the hydraulic cylinder 205 is fixedly installed with a tensioning component that can pull the hydraulic cylinder 205 downward. The outer side of the lower end of the tensioning component corresponding to the cable outlet hole 212 is provided with a cable routing vertical groove 216 with an opening facing downward.

[0027] During normal oil production, the hydraulic control well-washing valve is closed, and there is no liquid in the annulus above the hydraulic control packer. The capillary pressure and the tension of the tensioning assembly are balanced, and the tensioning assembly holds the hydraulic cylinder 205 to prevent it from moving upward and setting the rubber sleeve assembly 214. At this time, the associated gas generated in the oil well can enter the process pipeline from the annulus. When hot washing and dewaxing are required, the power to the submersible pump or downhole screw pump is turned off, and the pump is pressurized by hand. The hydraulic control well-washing valve is opened, the pumping unit is shut down, the production pipeline is closed, and the hot washing pipeline is connected. A certain pressure of hot washing liquid is first injected into the tubing through the boiler truck. Under the action of the control fluid, the hydraulic control packer passes through the cable. Overcoming the tension of the tensioning component, the hydraulic cylinder 205 moves upward to squeeze the rubber sleeve assembly 214, sealing the annulus. 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 surface from the annulus above the hydraulic control packer over the cable, achieving hot washing and dewaxing. After dewaxing, the hand pump is depressurized, the tension of the tensioning component balances the hydrostatic pressure in the capillary, the hydraulic control well-washing valve closes, and the rubber sleeve assembly 214 on the hydraulic control packer over the cable is restored to unsealed state. The annulus is unblocked again, and associated gas normally enters the surface process pipeline from the annulus, continuing normal production.

[0028] The above-mentioned hydraulically controlled packer for cable crossings 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 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 with its upper end positioned above the pressure cap 221 is located on the inner side of the pressure cap 221. A bushing ring platform 226, seated on the upper side of the pressure cap 221, is located on the outer side of the upper end of the bushing 220. A spring seat with its lower end positioned 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. 222, a support ring platform 227 is provided on the inner side of the lower end of the spring seat 222, and a vertical groove 216 with an opening facing downward is provided on the outer side of the lower end of the spring seat 222 corresponding to the position of the cable outlet hole 212. An upper support ring 218 is provided on the outer side of the connector 202 corresponding to the position of the lower side of the hydraulic cylinder ring platform 208, located inside the connecting sleeve 217. An upper spring 219 is provided on the outer side of the connector 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 outer side of the connector 202 corresponding to the position of the upper end of the connecting ring groove 211. A lower spring 224 is provided on the outer side of the connector 202 corresponding to the position between the lower support ring 223 and the support ring platform 227. During use, under normal oil extraction conditions, the pressure of the capillary tube is balanced by the tension of the upper spring 219 and the lower spring 224. The tension of the upper spring 219 and the lower spring 224 holds the liquid cylinder 205, preventing the liquid cylinder 205 from moving upwards and setting the rubber sleeve assembly 214. During the wax washing process, the capillary tube pressure is greater than the tension of the upper spring 219 and the lower spring 224, and the liquid cylinder 205 moves upwards to compress and set the rubber sleeve assembly 214. After the wax washing is completed, the capillary tube pressure is balanced by the tension of the upper spring 219 and the lower spring 224. Under the action of the upper spring 219 and the lower spring 224, the liquid cylinder 205 is pulled downwards, and the rubber sleeve assembly 214 also returns to the stretched state, completing the unsealing.

[0029] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the tensioning assembly also includes guide pins 228. At least one guide groove 229 is provided circumferentially at intervals on the outer side 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 portion of the bushing 220 corresponding to the lower position of each guide groove 229. An outer mounting hole is provided on the outer side of the lower portion of the pressure cap 221 corresponding to each inner mounting hole. A guide pin 228 is provided within the inner mounting hole, with its outer end located within the outer mounting hole and its inner end located below the guide groove 229. During use, the guide grooves 229 guide and limit the upward and downward movement of the bushing 220, pressure cap 221, and spring seat 222.

[0030] Example 4: As shown in the appendix Figure 1 , 2As shown in Figures 3 and 4, the assembly also includes O-ring seals 230. At least one O-ring seal 230 is provided vertically between the push ring platform 215 and the connecting body 202, corresponding to the position above the push ring groove. At least one O-ring seal 230 is also provided vertically between the hydraulic cylinder ring platform 208 and the hydraulic cylinder 205. During use, the O-ring seals 230 ensure the stability of the rubber sleeve assembly 214 during setting and unsetting.

[0031] Example 5: As shown in the attached document Figure 3 As shown, it also includes a capillary sleeve 231. The adapter 201, located above the hydraulic blind hole 210, has an inlet hole 232 and a hydraulic window 233 spaced apart vertically on its outer side. The capillary sleeve 231 is fixedly installed on the inner side of the upper end of the hydraulic blind hole 210. During use, the inlet hole 232 facilitates the insertion of the capillary into the hydraulic blind hole 210; the hydraulic window 233 facilitates the installation of the capillary sleeve 231.

[0032] Example 6: As attached Figure 1 , 5 As shown in Figure 6, a cable routing window 237 is provided on the outside of the adapter 201 above the cable routing blind hole 213. During use, by setting the cable routing window 237, it is convenient to pass the cable into the cable routing blind hole 213 and out through the cable outlet hole 212 and the cable routing vertical groove 216.

[0033] Example 7: As attached Figure 1 , 5 As shown, it also includes a round cable sealing sleeve 243 and a round cable clamping sleeve 244. The cable routing blind hole 213 is a round hole, and a sealing mounting annular groove is provided on the inner side of the upper end of the cable routing blind hole 213. The round cable sealing sleeve 243 is provided at the bottom of the sealing mounting annular groove, and the round cable clamping sleeve 244, whose lower end abuts against the upper side of the round cable sealing sleeve 243, is fixedly installed on the upper part of the sealing mounting annular groove. During use, the round cable clamping sleeve 244 clamps the round cable sealing sleeve 243 to ensure the sealing performance within the cable routing blind hole 213.

[0034] Example 8: As attached Figure 1 , 6As shown, 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 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. During use, the clamping screw 236 abuts against the clamping wedge 238 on the outer side of the flat cable clamping sleeve 235, thereby causing the flat cable clamping sleeve 235 to clamp the flat cable sealing sleeve 244, ensuring the sealing performance of the cable routing blind hole 213.

[0035] Example 9: As attached Figure 1 , 3 As shown, it also includes a lower connector 239, a set screw 240, a round nut 241, and a loose nut 242. The round nut 241 is fixedly installed on the lower outer side of the connecting body 202 corresponding to the middle position of the connecting ring groove 211 by a threaded connection. The loose nut 242 is provided on the outer side of the round nut 241. The upper inner side of the loose nut 242 is provided with an inner ring platform. The lower side of the inner ring platform sits on the upper side of the round nut 241. The lower connector 239 located on the lower outer side of the connecting body 202 is fixedly installed on the lower inner side of the loose nut 242 by a threaded connection. The round nut 241 and the connecting body 202 are fixedly installed together by the set screw 240. The loose nut 242 and the lower connector 239 are fixedly installed together by the set screw 240. During use, when the tubing string is lowered to the point where the hydraulic packer with cable needs to be installed, screw the lower connector 239 into the tubing string. During the tightening process, ensure that the hydraulic packer with cable and the power cable do not twist. If necessary, first remove the tightening screw, loosen the loose nut 242 and the lower connector 239 by about one or two turns, tighten the lower connector 239 to the tubing string below, and then screw the loose nut 242 and the lower connector 239 together. Tighten the set screw to prevent loosening.

[0036] The specific implementation methods of this invention are 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 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, and 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 electric pump or downhole screw pump, pressurize with a hand pump, open the hydraulic control well washing valve, shut down the pumping unit, close the oil production and delivery pipeline, connect the hot washing pipeline, first inject a certain pressure of hot washing liquid into the tubing through the boiler truck, and under the action of the control fluid, the hydraulic control packer of the cable overcomes the tension of the spring, the hydraulic cylinder 205 moves upward to squeeze the rubber sleeve assembly 214, and seals the annulus. The boiler truck continuously supplies hot washing liquid into the tubing, and 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 packer of the cable, thus achieving hot washing and dewaxing. (4) After the wax removal is completed, the hand pump is depressurized, the spring tension balances the hydrostatic pressure in the capillary, the hydraulic control well washing valve is closed, the rubber sleeve assembly 214 on the hydraulic control packer over the cable is restored to achieve unsealing, the annulus is unblocked again, the associated gas enters the surface process pipeline normally from the annulus, and normal production continues.

[0037] Example 10: As attached Figure 4As shown, 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. A sliding sleeve 2 and a spring 4 are provided sequentially from top to bottom on the outer side of the central tube 3, corresponding to the position between the upper connector 1 and the retaining ring 5. A second outer ring platform 12 and a third outer ring platform 13 are provided sequentially from top to bottom on the outer side of the upper part 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 is located below the first inner ring groove 16. The inner side of the lower end of the sliding sleeve 2 is provided with a first inner ring platform 14 and a second inner ring platform 15 from top to bottom. The inner diameter of the first inner ring platform 14 is larger than the inner diameter of the second inner ring platform 15. 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 is provided with 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 is provided with a second liquid passage hole 22 whose lower end communicates with the inner end of the pushing hole 23. A pressure relief hole 24, which is internally and externally connected, is provided on the outer side of the sliding sleeve 2 corresponding to the position between the second inner ring platform 15 and the third outer ring platform 13. The second inner ring platform 15 has a third inner ring groove 18 on its upper inner side. The lower outer side of the sliding sleeve 2 has several external through holes 25 spaced along the circumference, which can communicate with the third inner ring groove 18. The outer side of the middle part of the central tube 3, corresponding to the position between the external through holes 25 and the spring 4, has an outer ring groove 19 on its middle outer side. The inner side of the middle part of the central tube 3 has several internal through holes 26 spaced along the circumference, which can communicate with the outer ring groove 19. It also includes O-ring seals 6. At least one O-ring seal 6 is spaced vertically between the second outer ring platform 12 and the upper connector 1. At least one O-ring seal 6 is spaced vertically between the upper part of the sliding sleeve 2 above the pushing hole 23 and the second outer ring platform 12. At least one O-ring seal 6 is spaced vertically between the first inner ring platform 14 and the third outer ring platform 13 below the pushing hole 23. The system includes O-ring seals 6, with at least one O-ring seal 6 spaced vertically between the second inner ring platform 15 and the central tube 3 at the position above the third inner ring groove 18, at least one O-ring seal 6 spaced vertically between the second inner ring platform 15 and the central tube 3 at the position between the third inner ring groove 18 and the outer ring groove 19, and at least one O-ring seal 6 spaced vertically between the second inner ring platform 15 and the central tube 3 at the position below the outer ring groove 19; it also includes guide pins 7, with at least two vertically arranged guide grooves 20 spaced circumferentially along the outer side of the central tube 3 at the position above the lower end of the sliding sleeve 2, and a guide pin 7 with its inner end located in the upper end of the guide groove 20 fixedly installed on the outer side of the lower part of the sliding sleeve 2 at the position of each guide groove 20.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; it also includes an oil pipe coupling 9, which is fixedly installed on the outer side of the upper end of the upper connector 1; it also includes set screws 10, on which a central tube 3 is fixedly installed via a threaded connection on the inner side of the middle part of the upper connector 1, and a retaining ring 5 is fixedly installed via a threaded connection on the outer side of the lower part of the central tube 3, with at least two set screws 10 spaced circumferentially on the outer side of the retaining ring 5 to fix it together with the central tube 3.

[0038] Example 10 The specific usage process is as follows: (1) Tightly screw the existing cable-controlled hydraulic packer to the lower end of the hydraulic control well-washing valve, so that the control fluid capillary is connected to the capillary connector 8. According to the design of a rod-type oil production string for a certain well, when running the tubing on site, the cable-controlled hydraulic packer and the hydraulic control well-washing valve are tightly screwed 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 static liquid column pressure in the capillary, 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 (3) When hot cleaning and wax removal are required, pressure is applied to the oil pipe to ensure that the hydraulic control packer can reliably seal the oil sleeve annulus. Then, pressure is applied to 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 through the first liquid passage hole 21 via the control fluid capillary and the capillary connector 8 (i.e., the second inner ring groove 17 is the upper end of the first inner ring groove 16). After passing through the second liquid passage hole 22 set eccentrically 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 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 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 can be carried out. 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 of the cable can reliably seal the oil sleeve annulus and prevent a large amount of hot washing liquid from entering the reservoir; (4) After the dewaxing operation is completed, the control fluid is... The capillary tube continues to maintain the previous opening pressure, and the hot wash liquid under a certain pressure is no longer supplied in the tube column. The discharge channel 106 of the cable hydraulic control packer is opened, and the remaining small amount of hot wash liquid is discharged to the oil jacket annulus below, which will not have a bad impact on the reservoir. (5) After the remaining hot wash liquid is discharged, the control fluid capillary tube is depressurized, and the spring 4 overcomes the static liquid column pressure in the capillary tube and pushes the sliding sleeve 2 to move up, 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.

[0039] 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.

[0040] The specific implementation of this invention may be 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.

Claims

1. A hydraulically controlled packer for cable transfer, characterized in that... The system includes an adapter, connector, retaining ring, eccentric connecting neck, hydraulic cylinder, rubber sleeve assembly, and tensioning assembly. A retaining ring is fixedly installed on the outer upper end of the connector. An adapter, with its upper end positioned above the connector, is fixedly installed on the outer side of the retaining ring. A mounting plate is located on the inner side of the middle of the adapter. An eccentrically oriented hydraulic through-hole is eccentrically positioned on the connector. An eccentric mounting hole is located on the mounting plate corresponding to the position of the hydraulic through-hole. An eccentric connecting neck, with its upper end positioned within the mounting eccentric hole, is fixedly installed on the upper side of the connector. A hydraulic cylinder ring is located on the outer upper part of the connector. A hydraulic hole is located on the outer upper part of the connector corresponding to the position above the hydraulic cylinder ring. A hydraulic hole is located on the inner end of the connector corresponding to the position of the hydraulic hole. The upper side is provided with a hydraulic blind hole that can communicate with the lower end thereto. The lower outer side of the connector is provided with a connecting ring groove. The lower outer side of the connector above the connecting ring groove is provided with a cable outlet hole. The upper side of the connector corresponding to the inner end of the cable outlet hole is provided with a cable routing blind hole that can communicate with the lower end thereto. The lower inner side of the adapter is fixedly installed with a rubber sleeve assembly located on the upper outer side of the connector. The lower outer side of the rubber sleeve assembly is fixedly installed with a hydraulic cylinder. The middle inner side of the hydraulic cylinder is provided with a push ring platform located above the hydraulic cylinder ring platform. The lower inner side of the push ring platform is provided with a push ring groove. The lower outer side of the hydraulic cylinder is fixedly installed with a tensioning component that can pull the hydraulic cylinder downward. The lower outer side of the tensioning component corresponding to the cable outlet hole is provided with a cable routing vertical groove with an opening facing downward.

2. The hydraulically controlled packer for cable transfer according to claim 1, characterized in that... The tensioning assembly includes a connecting sleeve, an upper support ring, an upper spring, a bushing, a pressure cap, a spring seat, a lower support ring, a lower spring, and a drag screw. A connecting sleeve is fixedly installed on the outer side of the lower end of the hydraulic cylinder. A pressure cap is fixedly installed on the inner side of the lower end of the connecting sleeve. A bushing with its upper end positioned above the pressure cap is located inside the pressure cap. A bushing ring platform is located on the outer side of the upper end of the bushing, seated on the upper side of the pressure cap. A spring seat with its lower end positioned outside the middle of the connecting ring groove is fixedly installed on the outer side of the lower part of the bushing via a drag screw. A support ring platform is located on the inner side of the lower end of the spring seat. A vertical cable routing groove with an opening downwards is located on the outer side of the lower end of the spring seat corresponding to the cable outlet position. An upper support ring is located inside the connecting sleeve on the outer side of the connecting body corresponding to the lower side of the hydraulic cylinder ring platform. An upper spring is located on the outer side of the connecting body corresponding to the position between the upper support ring and the bushing. A lower support ring is fixedly installed on the outer side of the connecting body corresponding to the upper end of the connecting ring groove. A lower spring is located on the outer side of the connecting body corresponding to the position between the lower support ring and the support ring platform.

3. The hydraulically controlled packer for cable transfer according to claim 2, characterized in that... The tensioning assembly also includes guide pins. At least one guide groove is provided on the outer side of the connector corresponding to the middle position of the bushing along the circumference. An inner mounting hole is provided on the outer side of the middle of the bushing corresponding to the lower position of each guide groove. An outer mounting hole is provided on the outer side of the lower part of the pressure cap corresponding to each inner mounting hole. A guide pin is provided in the inner mounting hole with its outer end located in the outer mounting hole and its inner end located at the lower part of the guide groove.

4. The hydraulically controlled packer for cable transfer according to claim 1, 2, or 3, characterized in that... It also includes O-rings, with at least one O-ring spaced vertically between the push ring platform and the connecting body at the position above the push ring groove, and at least one O-ring spaced vertically between the cylinder ring platform and the cylinder.

5. The hydraulically controlled packer for cable transfer according to claim 1, 2, 3, or 4, characterized in that... It also includes a capillary sleeve, and the outer side of the conversion joint corresponding to the position above the hydraulic blind hole is provided with an inlet hole and a hydraulic window spaced at intervals. A capillary sleeve is fixedly installed on the inner side of the upper end of the hydraulic blind hole.

6. The hydraulically controlled packer for cable transfer according to claim 1, 2, 3, or 4, characterized in that... The adapter above the blind hole for wiring has a wiring opening on the outside.

7. The hydraulically controlled packer for cable transfer according to claim 7, characterized in that... It also includes a round cable sealing sleeve and a round cable clamping sleeve. The cable routing blind hole is a round hole. A sealing installation ring groove is provided on the inner side of the upper end of the cable routing blind hole. A round cable sealing sleeve is provided at the bottom of the sealing installation ring groove. A round cable clamping sleeve with its lower end abutting against the upper side of the round cable sealing sleeve is fixedly installed on the upper part of the sealing installation ring groove.

8. The hydraulically controlled packer for cable transfer according to claim 7, characterized in that... It also includes a flat cable sealing sleeve, a flat cable clamping sleeve, and a clamping screw. The cable routing blind hole is an elongated hole. A sealing installation groove is provided on the inner side of the upper end of the cable routing blind hole. A flat cable sealing sleeve is provided at the bottom of the sealing installation ring groove. A round cable clamping sleeve with its lower end abutting against the upper side of the round cable sealing sleeve is installed on the upper part of the sealing installation groove. A clamping wedge is provided on the outer side of the upper end of the round cable clamping sleeve. A clamping opening is provided on the outer side of the conversion connector corresponding to the position of the clamping wedge. A clamping screw with its inner lower end abutting against the upper side of the clamping wedge is fixedly installed in the clamping opening.

9. The hydraulically controlled packer for cable transfer according to claim 1, 2, 3, 7, or 8, characterized in that... It also includes a lower connector, a set screw, a round nut, and a slip nut. A round nut is fixedly installed on the lower outer side of the connecting body corresponding to the middle position of the connecting ring groove by a threaded connection. A slip nut is provided on the outer side of the round nut. An inner ring platform is provided on the inner side of the upper end of the slip nut. The lower connector located on the outer side of the lower end of the connecting body is fixedly installed on the inner side of the lower end of the slip nut by a threaded connection. The round nut and the connecting body are fixed together by a set screw. The slip nut and the lower connector are fixed together by a set screw.

10. The hydraulically controlled packer for cable transfer according to claim 4, 5, or 6, characterized in that... It also includes a lower connector, a set screw, a round nut, and a slip nut. A round nut is fixedly installed on the lower outer side of the connecting body corresponding to the middle position of the connecting ring groove by a threaded connection. A slip nut is provided on the outer side of the round nut. An inner ring platform is provided on the inner side of the upper end of the slip nut. The lower connector located on the outer side of the lower end of the connecting body is fixedly installed on the inner side of the lower end of the slip nut by a threaded connection. The round nut and the connecting body are fixed together by a set screw. The slip nut and the lower connector are fixed together by a set screw.

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