Hydraulic control cup seal packer

Abstract

This invention relates to the field of well washing technology and is a hydraulically controlled cup packer, comprising a venting valve seat, a lower connector, a plug, a floating piston, and a cup assembly. The lower outer side of the venting valve seat has an mounting ring platform. Several vertically penetrating venting channels are spaced along the circumference of the mounting ring platform. A sealing ring platform is located on the inner side of the upper part of each venting channel. A connecting neck is fixedly installed at the lower end of the mounting ring platform corresponding to the outer position of the venting channel. A lower connector, whose upper end abuts against the lower side of the mounting ring platform, is fixedly installed on the inner side of the connecting neck. This invention has a reasonable and compact structure and is easy to use. By incorporating the cup, it prevents the hot washing liquid above from entering the annulus below during hot washing and dewaxing. By incorporating the cup, it allows associated gas generated in the oil well to pass through its outer side during normal oil production and enter the annulus above, then enter the process pipeline through the side hole of the wellhead device. It features stability, reliability, and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of well cleaning technology, specifically a hydraulically controlled cup packer. 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 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, with hot washing being the most commonly used process. In rod-based oil production systems, hot washing is primarily performed using hollow sucker rods with a well-washing check valve. 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 process. Because hollow sucker rods are more expensive than solid sucker rods, and the reduced annulus between the sucker rod and tubing increases crude oil flow resistance, leading to more severe wax buildup and a shorter dewaxing cycle, some oil and gas producers are reluctant to use hollow sucker rods for hot washing and dewaxing. Instead, they use a hydraulically controlled well-washing valve to control the opening and closing of the casing-oil communication channel for hot washing and dewaxing. 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 valve is opened on the surface using the hand pump. After dewaxing, the hand pump is depressurized, the hydraulically controlled well-washing valve is closed, and normal production can resume. During normal production, to improve pump efficiency, associated gas needs to be discharged through the casing-oil annulus to the surface process pipeline. Since packers cannot be used to isolate the casing-oil annulus, using a hydraulically controlled well-washing valve for hot washing and dewaxing would result in a large amount of washing fluid entering the reservoir, requiring a longer time to restore normal production. This not only wastes the well-washing fluid, but also causes serious pollution to the reservoir, resulting in significant losses.

[0003] Patent document CN110552654B discloses a hydraulically controlled release type cup packer, which includes a central tube, a cup, a support tube, a release sleeve, a spring, a cylinder sleeve, and a piston. The support tube is sleeved outside the central tube, forming a hydraulically controlled annulus between the support tube and the central tube. The cup, release sleeve, cylinder sleeve, and piston are all sleeved on the outer wall of the support tube. A lower annular platform is formed on the inner wall of the cup. The cylinder sleeve rests on the lower end face of the lower annular platform, and the piston is installed inside the cylinder sleeve. The upper end of the piston also rests on the lower end face of the lower annular platform. A pressure transmission through hole is formed in the support tube, which allows the hydraulically controlled annulus and the cylinder sleeve to pass through. The inner cavity of the sleeve is interconnected, and the pressure transmission hole is lower than the lower end face of the piston. The upper end of the cup is fixed on the cup seat. The unsealing sleeve consists of a cylindrical sleeve body and a necking ring cap set at the upper end of the cylindrical sleeve body. A spring is installed inside the unsealing sleeve. The lower end of the spring abuts against the upper end face of the cup seat, and the upper end of the spring abuts against the lower end face of the necking ring cap at the upper end of the unsealing sleeve. The cup and cup seat can overcome the spring pressure and enter the unsealing sleeve completely under the drive of the piston. At least one cup is provided, and the number of cups, unsealing sleeves, cylinder liners, and pistons are all consistent. When the cup is provided... When there are two or more valves, the lower valve cup corresponding to the unsealing sleeve and the upper valve cup corresponding to the cylinder sleeve are connected as a single unit. The cylinder sleeve is fixed to the support tube by positioning screws. The upper end of the support tube is limited by the outer clamping platform of the central tube on the outer wall of the central tube. The upper end of the necking ring cap of the uppermost valve cup is limited by the outer clamping platform of the support tube on the outer wall of the upper end of the support tube. The upper end of the central tube is connected to the upper connector. The lower end of the support tube and the lower end of the lowermost cylinder sleeve both rest on the adjusting ring. The adjusting ring is connected to the lower connector. The upper end of the lower connector is connected to the central tube. It is also fixed to the lower connector by fixing screws; the upper end of the support tube has an oblique hydraulic control through hole, which connects to the hydraulic control annulus; the upper inner wall of the support tube is sealed with the central tube by a sealing ring, and the lower end face of the support tube is sealed with the adjusting ring and the central tube by a sealing ring; the inner surface of the unsealing sleeve is sealed with the support tube by a sealing ring; the leather cup seat is sealed with the leather cup by a sealing ring; the inner and outer walls of the piston are sealed with the support tube and the cylinder liner by sealing rings respectively; the cylinder liner and the support tube are sealed by a sealing ring; the upper end of the adjusting ring is provided with a concave sealing groove, which contains a sealing ring.

[0004] Patent document CN110439500B discloses a pressure-relieving self-sealing cup packer, comprising: an upper connector; a connecting sleeve, the upper end of which is connected to the outer wall of the lower end of the upper connector; a central tube, the upper end of which is connected to the inner wall of the lower end of the connecting sleeve, and a pressure balancing mechanism is provided inside the central tube; a cup rubber sleeve, which is connected to the outer wall of the lower end of the central tube; a rubber sleeve seat, which is connected to the bottom of the cup rubber sleeve; a guide rail, the inner wall of the upper end of which is connected to the outer wall of the bottom of the lower end of the central tube, and the end face of the upper end of the guide rail is matched with the bottom end face of the rubber sleeve seat, the outer wall of the upper end of the guide rail being a conical structure; and a slip assembly. The system comprises: a guide rail connected to the outer wall of the guide rail; a centering head connected to the outer wall of the guide rail, with its upper end contacting the lower end of the slip assembly; a slip ring sleeve connected to the outer wall of the guide rail, with its upper end connecting to the bottom outer wall of the centering head; and a lower connector connected to the outer wall of the lower end of the guide rail. The pressure balancing mechanism includes an orifice plate, a valve stem, and a valve seat. One end of the orifice plate is connected to the inner wall of the upper end of the sleeve, the valve stem is connected to the other end of the orifice plate and is located inside the central tube, and the valve seat is connected to the inner wall of the bottom of the central tube, with the bottom end face of the valve stem matching the upper end face of the valve seat. The valve seat and the inner wall of the bottom of the central tube are connected to the outer wall of the guide rail. A sealing ring groove is provided on the diameter, and a sealing ring is provided in the sealing ring groove. The sealing ring is an "O" type sealing ring. There are two sealing ring grooves, and a sealing ring is provided in both sealing ring grooves. The orifice plate is provided with a central hole and flow holes evenly distributed around the circumference. The upper end of the valve stem passes through the central hole of the orifice plate, and a locking nut is also provided on the valve stem to fix the valve stem to the orifice plate. A guide pin is provided on the outer wall of the connecting sleeve perpendicular to the outer wall of the connecting sleeve. The upper end of the inner wall of the connecting sleeve is provided with an upper step, and the lower end of the inner wall of the connecting sleeve is provided with a lower step. The inner wall of the connecting sleeve above the upper step is connected to the lower outer wall of the upper connector. One end of the tube is mounted on the upper step, and the upper end of the orifice plate is in contact with the lower end of the upper connector. A guide groove is provided on the outer wall of the upper end of the central tube, and the groove cooperates with the guide pin. A bypass hole is provided in the circumferential direction of the central tube. The upper end of the central tube is connected to the inner wall of the lower end of the connecting sleeve by mounting on the lower step. A slip ring and a slip ring pin are provided on the inner wall of the slip ring sleeve. The guide rail is provided with a long / short switching groove. The slip ring is connected to the inner wall of the slip ring sleeve by the slip ring pin. One end of the slip ring pin is located in the long / short switching groove, and the other end of the slip ring pin is in contact with the inner wall of the slip ring sleeve. The slip ring pin can slide freely up and down in the switching groove of the guide rail. Summary of the Invention

[0005] This invention provides a hydraulically controlled cup packer that overcomes the shortcomings of the prior art. It can effectively solve the problem that the washing fluid cannot be prevented from entering the reservoir when using a hydraulically controlled well-washing valve for hot washing and dewaxing in existing rod-operated oil production systems.

[0006] The technical solution of this invention is achieved through the following measures: A hydraulically controlled cup packer includes a vent valve seat, a lower connector, a plug, a floating piston, and a cup assembly. A mounting ring is provided on the outer side of the lower end of the vent valve seat. Several vertically penetrating vent channels are spaced along the circumference of the mounting ring. A sealing ring is provided on the inner side of the upper part of each vent channel. A connecting neck is fixedly installed at the lower end of the mounting ring corresponding to the outer position of the vent channel. A lower connector, whose upper end abuts against the lower side of the mounting ring, is fixedly installed on the inner side of the connecting neck. A connecting neck is also fixedly installed at the upper position of each vent channel. The outer side is provided with a guide hole that can communicate with the corresponding discharge channel; the inner side of the upper end of the lower connector is provided with a connecting cone hole that can communicate with the lower end of the discharge channel. The connecting cone hole is a frustum shape that is larger at the top and smaller at the bottom. The discharge channel is provided with a floating piston that can block the guide hole after rising. The discharge channel corresponding to the position between the sealing ring platform and the floating piston is provided with a deblocking spring. The upper side of the floating piston is provided with a plug located inside the deblocking spring that can block the discharge channel after rising to the sealing ring platform; a cup assembly is installed on the outer side of the upper part of the discharge valve seat corresponding to the position above the installation ring platform.

[0007] The following are further optimizations and / or improvements to the above-mentioned technical solution: The aforementioned cup assembly may include a filter cylinder, a cup, and a support frame. An mounting cone hole is provided on the upper side of the mounting ring platform. The mounting cone hole is a frustum-shaped structure, wider at the top and narrower at the bottom. A cup is installed inside the mounting cone hole. The cup is a cone-shaped structure, wider at the top and narrower at the bottom. A fixing ring platform is provided on the inner side of the lower end of the cup. A support frame is fixedly installed on the inner side of the lower end of the fixing ring platform. A flow guide cone hole is provided on the inner side of the lower end of the support frame. The flow guide cone hole is a frustum-shaped hole, narrower at the top and wider at the bottom. A connecting ring platform is provided on the outer side of the upper end of the vent valve seat. A filter cylinder, with its lower end located inside the cup and abutting against the upper side of the fixing ring platform, is fixedly installed on the outer side of the lower end of the connecting ring platform. The filter cylinder has several filter holes.

[0008] The above may also include a tubing coupling, with the tubing coupling fixedly installed on the outer side of the upper end of the connecting ring platform.

[0009] The above may also include set screws, an oil pipe coupling is fixedly installed on the outer side of the upper end of the connecting ring platform by a threaded connection, a filter cartridge is fixedly installed on the outer side of the lower end of the connecting ring platform by a threaded connection, a lower connector is fixedly installed on the inner side of the lower end of the connecting neck by a threaded connection, at least two set screws are provided at circumferential intervals on the outer side of the lower end of the connecting neck to fix it together with the lower connector, and a support frame is fixedly installed on the inner side of the lower end of the fixing ring platform by vulcanization.

[0010] The above may also include O-rings, with at least one O-ring spaced vertically on the upper outer side of the floating piston, at least one O-ring spaced vertically on the lower outer side of the floating piston, and at least one O-ring spaced vertically between the upper outer side of the lower connector and the connecting neck.

[0011] The aforementioned mounting ring platform can have six vertically connected drainage channels evenly distributed along the circumference.

[0012] The upper part of the aforementioned plug can be a frustum shape, with the lower part of the plug having a smaller outer diameter than the inner diameter of the sealing ring.

[0013] The invention has a reasonable and compact structure and is easy to use. By setting a diaphragm cup, it can prevent the hot washing liquid above it from entering the annulus below it during hot washing and wax removal. By setting a diaphragm cup, it can allow the associated gas generated by the oil well to pass through its outer side during normal oil pumping production and enter the annulus above it, and then enter the process pipeline through the side hole of the wellhead device. It has the characteristics of 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 A schematic diagram of the front sectional view of the structure in use.

[0016] Appendix Figure 3 For the appendix Figure 1 Enlarged front view sectional view of the middle bleed valve seat.

[0017] Appendix Figure 4 This is a schematic diagram of the main cross-sectional structure of the hydraulic control well-washing valve in Examples 1 to 8.

[0018] Appendix Figures 1 to 3 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.

[0019] Appendix Figure 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. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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 , 2 As shown in Figures 3 and 4, the hydraulically controlled cup packer includes a vent 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 vent valve seat 101. Several vertically penetrating vent 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 vent 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 vent channel 106. A lower connector 102, whose upper end abuts against the lower side of the mounting ring platform 108, is fixedly installed on the inner side of the connecting neck 110. A sealing ring platform 109 is provided on the outer side of the connecting neck 110 corresponding to the upper position of each vent channel 106, which can connect with the corresponding position. A guide hole 111 is provided in connection with the discharge channel 106; a connecting cone hole 115 is provided on the inner side of the upper end of the lower connector 102, which can communicate with the lower end of the discharge channel 106. The connecting cone hole 115 is a frustum shape with a larger upper part and a smaller lower part. A floating piston 113 is provided in the discharge channel 106, which can block the guide hole 111 after rising. A deblocking spring 112 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 floating piston 113, which is located in the deblocking spring 112 and can block the discharge channel 106 after rising to the sealing ring platform 109; a cup assembly is installed on the outer side of the upper part of the discharge valve seat 101 at the position above the installation ring platform 108.

[0023] During use, the hydraulically controlled packer is installed below the hydraulically controlled well-washing valve. Based on the design of a rod-operated production tubing string for a certain well, the hydraulically controlled packer and the hydraulically controlled well-washing valve are tightly screwed into the correct position within the tubing string during on-site tubing string operation. During normal oil production, the hydraulically controlled well-washing valve is closed, and there is no liquid in the annulus above the hydraulically controlled packer. The liquid in the tubing enters the discharge channel 106 through the connecting cone hole 115 at the upper end of the lower connector 102 and acts on the lower side of the floating piston 113. Applying a certain upward force to overcome the elastic force of the unblocking spring 112, the floating piston 113 is pushed upward, pushing 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. When hot washing and dewaxing are required, the pumping unit is shut down, the oil production and delivery pipeline is closed, the hot washing pipeline is connected, and a certain amount is first injected into the tubing through the boiler truck. The pressurized hot wash fluid ensures that the floating piston 113 tightly squeezes the plug 114 into the sealing ring 109 to seal the discharge channel 106. Then, the ground uses a hand pump or a dedicated hydraulic station to gradually open the hydraulically controlled well-washing valve. The boiler truck continuously supplies hot wash fluid into the tubing. The opened hydraulically controlled well-washing valve connects the tubing cavity with the annulus. The hot wash fluid flows through the tubing cavity into the annulus and returns to the ground from the annulus above the hydraulically controlled packer, achieving hot wash and dewaxing. After dewaxing is completed, the hydraulically controlled well-washing valve remains open. With the valve in the open position, 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, opening the drain channel 106. The small amount of hot wash fluid remaining in the annulus above the hydraulically controlled cup packer flows through the cup assembly into the drain channel 106, and then flows from the guide hole 111 into the annulus below the hydraulically controlled cup packer. After the remaining hot wash fluid in the annulus above the hydraulically controlled cup packer is drained, the hydraulically controlled well washing valve is closed, and normal oil pumping production is restarted.

[0024] The above-mentioned hydraulically controlled cup packer can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1 , 2As shown in Figure 3, the diaphragm assembly includes a filter cylinder 103, a diaphragm 104, and a support frame 105. An 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, wider at the top and narrower at the bottom. A diaphragm 104 is installed inside the mounting cone hole 116. The diaphragm 104 is a cone shape, wider at the top and narrower at the bottom. A fixing ring platform 117 is provided on the inner side of the lower end of the diaphragm 104. The support frame 105 is fixedly installed on the inner side of the lower end of the fixing ring platform 117. A flow guiding cone hole 118 is provided on the inner side of the lower end of the support frame 105. The flow guiding cone hole 118 is a frustum shape, narrower at the top and wider at the bottom. A connecting ring platform 119 is provided on the outer side of the upper end of the vent valve seat 101. A filter cylinder 103, with its lower end located inside the diaphragm 104 and its lower end abutting against the upper side of the fixing ring platform 117, is fixedly installed on the outer side of the lower end of the connecting ring platform 119. The filter cylinder 103 has several filter holes 120. During use, by setting up the cup 104, the hot washing liquid above it can be prevented from entering the annulus below it during hot washing and wax removal. By setting up the cup 104, the associated gas generated by the oil well can pass through its outer side during normal oil pumping production and enter the annulus above it, and then enter the process pipeline through the side hole of the wellhead device.

[0025] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figure 3, it also includes a tubing coupling, which is fixedly installed on the outer side of the upper end of the connecting ring platform 119. This design facilitates connection to the upper tubing string during use.

[0026] Example 4: As shown in the appendix Figure 1 , 2 As shown in Figure 3, the system also includes set screws. An oil pipe coupling is threadedly fixed to the outer side of the upper end of the connecting ring 119. A filter cartridge 103 is threadedly fixed to the outer side of the lower end of the connecting ring 119. A lower connector 102 is threadedly fixed to the inner side of the lower end of the connecting neck 110. At least two set screws are spaced circumferentially along the outer side of the lower end of the connecting neck 110 to secure it to the lower connector 102. A support frame 105 is vulcanized and fixed to the inner side of the lower end of the fixing ring 117. This configuration facilitates the connection between the components during use.

[0027] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figure 3, it 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. During use, this arrangement allows the floating piston 113 to block the guide hole 111 after it rises.

[0028] Example 6: As attached Figure 1 , 2 As shown in Figure 3, six vertically connected drainage channels 106 are evenly distributed along the circumference of the mounting ring 108. During use, this design facilitates the discharge of any remaining small amount of hot washing liquid from the annulus above the diaphragm cup 104 into the annulus below the diaphragm cup 104.

[0029] Example 7: As attached Figure 1 , 2 As shown in Figure 3, the upper end of the plug 114 is a frustum shape, smaller at the top and larger at the bottom, with the outer diameter of the lower part of the plug 114 being larger than the inner diameter of the sealing ring platform 109. During use, this design facilitates the plug 114 to rise to the sealing ring platform 109 and then seal the leakage channel 106.

[0030] The specific implementation methods of this invention are 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 string of a certain well, when running the tubing string on site, tighten the hydraulic control cup packer and the hydraulic control well washing valve in the correct position in the tubing string. (2) During normal oil production, 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 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 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 blocking 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, first inject hot washing liquid at a certain pressure into the oil pipe through the boiler truck, and ensure that the floating piston 113 tightly squeezes the plug 114 into the sealing ring platform 109 to block the discharge channel 106. Then, the ground uses a hand pump or a special hydraulic station to pressurize and gradually open the hydraulic control well washing valve. The boiler truck continuously supplies hot washing liquid into the oil pipe. The opened hydraulic control well washing valve connects the inner cavity of the oil pipe with the annulus of the casing. The hot washing liquid flows through the inner cavity of the oil pipe into the annulus of the casing and returns to the ground from the annulus of the casing above the hydraulic control cup packer, thus achieving hot washing and dewaxing. (4) After the wax removal is completed, keep the hydraulic control well washing valve in the open state to ensure that the liquid pressure in the tubing and the annulus is balanced. Under the elastic force of the unblocking spring 112, the floating piston 113 moves down and the discharge channel 106 opens. The small amount of hot washing liquid 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. It 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, close the hydraulic control well washing valve and restart normal oil pumping production.

[0031] In step (3) above, due to the opening of the hydraulic control well washing valve, the hot washing liquid flows through the inner cavity of the tubing and enters the annulus through the hydraulic control well washing valve. As a result, the hot washing liquid entering the annulus will generate throttling pressure loss. Moreover, the area of ​​the lower end of the floating piston 113 affected by the liquid inside the tubing is larger than the area of ​​the upper end of the plug 114 affected by the liquid in the annulus. Even if there is a small amount of leakage at the plug 114, the upward force below the floating piston 113 is always greater than the sum of the pressure above the plug 114 and the elastic force generated by the unblocking spring 112. Therefore, the discharge channel 106 will be reliably blocked during the hot washing and wax removal process.

[0032] In step (3) above, the pressure of the hot washing liquid provided by the boiler car must be sufficient to overcome the pressure loss caused by throttling and friction, so that the hot washing liquid can return to the ground from the oil jacket annulus.

[0033] In step (3) above, it is important to pay close attention to the flow rate of the hot washing fluid entering the tubing and the flow rate of the hot washing fluid returning to the surface. If the two flow rates are very close, it indicates that the hydraulic control cup packer is in good sealing condition. If the flow rate of the hot washing fluid entering the tubing is greater than the flow rate of the well washing fluid returning to the surface, it indicates that the seal at the plug 114 has failed, the drain channel 106 is open, and leakage occurs. At this time, the opening of the hydraulic control well washing valve should be reduced to generate a large throttling pressure loss, thereby pressing the plug 114 upward through the floating piston 113 to seal the drain channel 106.

[0034] In step (4) above, after the wax removal is completed, the remaining hot washing liquid in the annulus above the hydraulic control cup packer must be drained. Otherwise, during subsequent normal oil pumping production, the associated gas generated by the oil well cannot pass through the outer side of the hydraulic control cup packer and enter the annulus above the cup 104 packer.

[0035] In step (4) above, under normal circumstances, when the hot wash liquid stops being injected into the oil pipe, the pressure below the floating piston 113 in the hydraulic control cup packer will decrease, thereby reducing the sealing performance of the conical plug 114. The hot wash liquid in the annulus of the oil sleeve will leak onto the floating piston 113, and the pressure above and below the floating piston 113 will tend to balance. Thus, with the thrust of the unblocking spring 112, the seal of the conical plug 114 completely fails, and the remaining hot wash liquid in the annulus of the oil sleeve above the hydraulic control cup packer enters through the filter hole 120 set on the filter cylinder 103. The fluid enters the area between the filter cartridge 103 and the drain valve seat 101, flows into the drain channel 106, and flows from the guide hole 111 into the annulus below the hydraulic control cup packer. If the conical plug 114 remains blocked and cannot be released, and the remaining hot wash fluid in the annulus above the hydraulic control cup packer cannot be discharged, it is necessary to pressurize the annulus with gas to push the conical plug 114 open. After the remaining hot wash fluid 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: 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.

[0037] Example 8: The specific usage process is as follows: (1) Tightly screw the existing hydraulic control cup 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 the rod production tubing of a certain well, when running the tubing on site, the hydraulic control cup packer and the hydraulic control well washing valve are tightly screwed to 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 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-rings. The sealing ring 6 and the sliding sleeve 2 are sealed to ensure that the normal production tubing does not leak; (3) When hot cleaning and wax removal are required, pressure is applied to the oil pipe to ensure that the hydraulic control cup packer reliably seals the oil sleeve annulus. Then, the control fluid capillary connected to the capillary connector 8 is pressurized. 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, i.e., the upper end of the first inner ring groove 16), and then enters the cavity formed by the sliding sleeve 2 and the central tube 3 through the push hole 23 via the second liquid passage hole 22 on the central tube 3 (i.e., below the second outer ring platform 12 and above the first inner ring platform 14). A certain pressure of 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 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 cup packer reliably seals the oil sleeve annulus and prevents a large amount of hot washing liquid from entering the reservoir; (4) After the dewaxing operation is completed, the control fluid capillary 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 tubing. The discharge channel 106 of the hydraulic control cup 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 liquid capillary 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.

[0038] 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.

[0039] The specific implementation of this invention may be 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 the fluid pressure balance between the tubing and the annulus. Under the elastic force of the unblocking spring 112, the floating piston 113 moves down, the drain 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 drain valve seat 101 through the filter hole 120 provided on the filter cylinder 103, and flows into the drain channel 106, and flows from the guide hole 111 to the hydraulic control cup. 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.

Claims

1. A hydraulically controlled cup packer, characterized in that... The device includes a relief valve seat, a lower connector, a plug, a floating piston, and a cup assembly. The lower outer side of the relief valve seat has an mounting ring platform. Several vertically penetrating relief channels are spaced along the circumference of the mounting ring platform. A sealing ring platform is located on the upper inner side of each relief channel. A connecting neck is fixedly installed at the lower end of the mounting ring platform corresponding to the outer position of the relief channel. A lower connector, whose upper end abuts against the lower side of the mounting ring platform, is fixedly installed on the inner side of the connecting neck. A guide hole, capable of communicating with the corresponding relief channel, is located on the outer side of the connecting neck at the upper position of each relief channel. A connecting cone hole, shaped like a frustum (larger at the top and smaller at the bottom), is located on the inner side of the upper end of the lower connector, capable of communicating with the lower end of the relief channel. A floating piston, capable of blocking the guide hole after ascending, is located within the relief channel. A release spring is located within the relief channel between the sealing ring platform and the floating piston. A plug, located within the release spring and capable of blocking the relief channel after ascending to the sealing ring platform, is located on the upper side of the floating piston. A cup assembly is installed on the upper outer side of the relief valve seat corresponding to the position above the mounting ring platform.

2. The hydraulically controlled cup packer according to claim 1, characterized in that... The diaphragm assembly includes a filter cartridge, a diaphragm, and a support frame. An mounting cone hole, shaped like a frustum (larger at the top and smaller at the bottom), is located on the upper side of the mounting ring platform. The diaphragm is a cone-shaped tube, also larger at the top and smaller at the bottom. A fixing ring platform is located on the inner side of the lower end of the diaphragm. The support frame is fixedly installed on the inner side of the lower end of the fixing ring platform. A flow guide cone hole, shaped like a frustum (smaller at the top and larger at the bottom), is located on the inner side of the lower end of the support frame. A connecting ring platform is located on the outer side of the upper end of the vent valve seat. A filter cartridge, with its lower end inside the diaphragm and abutting against the upper side of the fixing ring platform, is fixedly installed on the outer side of the lower end of the connecting ring platform. The filter cartridge has several filter holes.

3. The hydraulically controlled cup packer according to claim 2, characterized in that... It also includes a pipe coupling, which is fixedly installed on the outer side of the upper end of the connecting ring platform.

4. The hydraulically controlled cup packer according to claim 3, characterized in that... It also includes set screws, an oil pipe coupling is fixedly installed on the outer side of the upper end of the connecting ring platform by a threaded connection, a filter cartridge is fixedly installed on the outer side of the lower end of the connecting ring platform by a threaded connection, a lower connector is fixedly installed on the inner side of the lower end of the connecting neck by a threaded connection, at least two set screws are provided at circumferential intervals on the outer side of the lower end of the connecting neck to fix it together with the lower connector, and a support frame is fixedly installed on the inner side of the lower end of the fixing ring platform by vulcanization.

5. The hydraulically controlled cup packer according to claim 1, 2, 3, or 4, characterized in that... It also includes O-rings, with at least one O-ring spaced vertically on the upper outer side of the floating piston, at least one O-ring spaced vertically on the lower outer side of the floating piston, and at least one O-ring spaced vertically between the upper outer side of the lower connector and the connecting neck.

6. The hydraulically controlled cup packer according to claim 1, 2, 3, or 4, characterized in that... The mounting ring platform has six vertically connected drainage channels evenly distributed along its circumference.

7. The hydraulically controlled cup packer according to claim 5, characterized in that... The mounting ring platform has six vertically connected drainage channels evenly distributed along its circumference.

8. The hydraulically controlled cup packer according to claim 1, 2, 3, 4, or 7, characterized in that... The upper part of the plug is a frustum shape with a smaller top and a larger bottom, and the outer diameter of the lower part of the plug is larger than the inner diameter of the sealing ring.

9. The hydraulically controlled cup packer according to claim 5, characterized in that... The upper part of the plug is a frustum shape with a smaller top and a larger bottom, and the outer diameter of the lower part of the plug is larger than the inner diameter of the sealing ring.

10. The hydraulically controlled cup packer according to claim 6, characterized in that... The upper part of the plug is a frustum shape with a smaller top and a larger bottom, and the outer diameter of the lower part of the plug is larger than the inner diameter of the sealing ring.

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