An electric pulse unblocking device and a multi-stage continuous liquid-electric pulse unblocking device

Abstract

The present invention discloses an electric pulse unblocking device and a multi-stage continuous liquid-electric pulse unblocking equipment, the device comprising a shell, the shell comprising a controller, an energy storage capacitor, a vacuum trigger device and a positive electrode column connected in sequence through a steel pipe cable, and a negative electrode column is correspondingly arranged below the positive electrode column. The positive and negative electrode columns are fixed in the shell by insulating materials, and a cavity is formed between the insulating materials for storing liquid. The shell is provided with perforations at the cavity position for liquid to enter and exit the cavity. The device comprises more than two electric pulse unblocking devices. The device of the present invention integrates a pulse generator, and has a simple, compact and complete structure. The single energy release of the liquid-electric pulse unblocking device can be changed by setting different parameters of the controller; the device of the present invention can realize multi-stage pulse discharge, form a multi-dimensional unblocking area, and also adapt to a variety of underground environments.

Description

Technical Field

[0001] The invention relates to the technical field of liquid-electric pulse petroleum plugging removal, and in particular to an electric pulse plugging removal device and a multi-stage continuous liquid-electric pulse plugging removal device. Background Art

[0002] Existing oil well unblocking technologies usually use physical or chemical methods to remove blockages in oil wells, such as using drilling tools, acidifiers or solvents. However, these traditional methods have some limitations, including high cost, time consumption, risk of equipment damage, and environmental pollution. In order to overcome the limitations of traditional methods and provide a more effective and environmentally friendly oil well unblocking device, the proposal of a downhole liquid-electric pulse unblocking device is of great significance. The device is based on liquid-electric pulse technology and achieves the unblocking and removal of oil well blockages by controlling the generation and propagation of electric pulses.

[0003] The electric pulse plugging removal technology based on the "liquid-electric effect" is widely used in the fields of oil and gas field production increase, shale gas and coalbed methane mining because it uses physical methods to effectively remove mechanical impurities, drilling mud and sediments in the near-wellbore area, destroy salt deposits, and form unclosed micro-cracks. This technology has the following advantages:

[0004] (1) Efficient unblocking: Electric pulse unblocking technology can quickly and efficiently remove blockages in oil wells or pipelines. By controlling the intensity, frequency and timing of the electric pulse, the structure and adhesion of the blockage can be effectively destroyed, thereby quickly restoring the fluid channel and improving production efficiency.

[0005] (2) Environmentally friendly and sustainable: Compared with traditional physical or chemical deblocking methods, electric pulse deblocking technology is more environmentally friendly and sustainable. It does not require the use of chemical agents, reducing environmental pollution and the use of hazardous substances. In addition, the energy consumption of electric pulse deblocking technology is relatively low, which meets the requirements of sustainable development.

[0006] (3) Wide applicability: Electric pulse plugging removal technology is applicable to various types of blockages, including sediments, scale, wax, gel, etc. Whether it is an oil well, pipeline or other fluid system, electric pulse plugging removal technology can provide a solution and can be adjusted and optimized according to the characteristics of different blockages.

[0007] (4) Non-invasive operation: Electric pulse unblocking technology can usually be operated without interrupting production or operations. It does not require dismantling equipment or large-scale engineering, avoiding production interruptions and additional manpower and material costs.

[0008] (5) Real-time monitoring and control: Electric pulse unblocking technology is usually used in conjunction with a real-time monitoring and control system to monitor and adjust the unblocking process in real time. By monitoring fluid pressure, flow, and the state of the blockage, timely measures can be taken to optimize the unblocking effect.

[0009] There has been a lot of research on electric pulse unblocking devices, but there are still some problems.

[0010] Chinese patent publication number CN110107272A discloses a high-energy electric pulse unblocking device, including an electrode device, a filter section and a pulse power supply body. The electrode device includes an electrode body and a control valve, a sealing ring and positive and negative electrodes respectively arranged on the electrode body. When the device is working underground, the liquid is introduced and discharged through the control valve, and the control valve is more easily blocked by impurities, which makes the electrode unusable. In addition, the device uses the internal and external pressure difference to remove the liquid, which also puts forward strict conditions for sealing. If the sealing effect does not meet the requirements, it will not be able to store a large amount of liquid, which reduces the intensity of the shock wave.

[0011] Chinese patent publication number CN115788387A discloses an electrode system for a liquid-electric pulse shock wave oil production enhancement device, in which an open groove is radially arranged on the side wall of the electrode base, and an upper electrode and a lower electrode are arranged in the open groove. The two electrodes generate a liquid-electric pulse shock wave and emit it along the direction of the open groove, which can change the direction of each electric pulse shock wave. However, in order to achieve the purpose of changing the pulse direction, the device is designed with an open groove that will cause the liquid to be unable to remain in the electrode cavity, and the electric pulse will not be completely in the liquid dielectric, which greatly reduces the intensity of the shock wave generated by the liquid-electric pulse.

[0012] Chinese patent publication number CN105952426A discloses an oil well unblocking and production-increasing device based on liquid-electric pulse shock waves, including a ground power supply control device, a logging cable, and a downhole liquid-electric pulse shock wave transmitter. During operation, the logging cable places the liquid-electric pulse shock wave transmitter at the perforation of the downhole oil layer, and the number and repetition frequency of the liquid-electric pulse shock waves are set by controlling the ground power supply control device. Since the power supply control device is located on the ground above the well, the high-voltage pulse used for the liquid-electric pulse shock wave needs to be transmitted to the downhole electric pulse shock wave transmitter via the logging cable, and long-distance transmission will result in energy loss or attenuation. This may cause the electric pulse energy to be unable to fully reach the target blockage, affecting the unblocking effect.

[0013] The electric pulse deblocking device needs to meet stringent conditions when working underground, which poses a huge challenge for its manufacturing equipment. Summary of the invention

[0014] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and to provide an electric pulse unblocking device and a multi-stage continuous liquid-electric pulse unblocking equipment based on the electric pulse unblocking device, which has a simple and compact structure and a high degree of integration, can realize multi-stage pulse discharge, and the energy release of a single pulse discharge is controllable.

[0015] The technical solution of the present invention is described in detail as follows:

[0016] In a first aspect, the present invention provides an electric pulse unblocking device, comprising a housing (4-16), wherein the housing (4-16) comprises a controller (4-4), an energy storage capacitor (4-5), a vacuum trigger device (4-6) and a positive electrode column (4-7) which are sequentially connected via a steel pipe cable (4-3), and a negative electrode column (4-10) is correspondingly arranged below the positive electrode column (4-7);

[0017] The positive electrode column (4-7) and the negative electrode column (4-10) are both fixed in the outer shell (4-16) by means of an insulating material (4-15); a cavity (4-11) for storing liquid is formed between the insulating material (4-15) that fixes the positive electrode column (4-7) and the negative electrode (4-10); and the outer shell (4-16) is provided with perforations (4-12) at the position of the cavity (4-11) for liquid to enter and exit the cavity (4-11).

[0018] Optionally or preferably, in the above-mentioned electric pulse unblocking device, a water-blocking round shell (4-14) is provided in the cavity (4-11), and the water-blocking round shell (4-14) is a cylindrical shell structure including a side wall and a top surface, the side wall is in contact with the outer shell (4-16) and can be moved up and down to open or cover the perforation (4-12), and a through hole is provided in the middle of the top surface, and the through hole can correspond to the positive electrode column (4-7) passing through; the outer shell (4-16) is not sealed at a position above the side wall of the cavity (4-11) to allow liquid to flow; and the water-blocking round shell (4-14) is made of a material with a density less than that of water.

[0019] Optionally or preferably, in the above-mentioned electric pulse unblocking device, the water blocking round shell (4-14) is made of a carbon fiber reinforced polymer to form an outer skin and a foam material to be filled inside.

[0020] Optionally or preferably, in the electric pulse unblocking device, the through hole on the top surface of the water blocking round shell (4-14) is slightly lowered so that the outer circumference of the top surface is tilted downward in the direction of the through hole, and the tilt angle is 3-5°.

[0021] Optionally or preferably, in any of the above electric pulse unblocking devices, the insulating material (4-15) is fluororubber and / or polyimide.

[0022] Optionally or preferably, in any of the above electric pulse unblocking devices, the positive electrode column (4-7) is T-shaped, and the front end is configured as a conical positive electrode discharge end (4-8); the negative electrode column (4-10) is T-shaped, and the front end is configured as a conical negative electrode discharge end (4-9); the front end is the end portion of the positive electrode column (4-7) and the negative electrode (4-10) facing each other.

[0023] Optionally or preferably, in any of the above electric pulse unblocking devices, the housing (4-16) is further provided with an annular filter screen (4-13) at a position above the side wall of the cavity (4-11).

[0024] Optionally or preferably, any of the above electric pulse unblocking devices further includes a first isolation seal (4-17), and the controller (4-4), energy storage capacitor (4-5) and vacuum trigger device (4-6) are all fixed in the shell (4-16) through the first isolation seal (4-17); the shell (4-16) is also provided with a cable through hole (4-2) for the steel pipe cable (4-3) to pass through.

[0025] In a second aspect, the present invention provides a multi-stage continuous hydraulic-electric pulse plugging removal device, comprising a shell, in which a ground device and a drill string are installed, as well as a ground controller (1), a main steel pipe cable (2), a cable positioning seal (3), an electric pulse plugging removal device (4), a round plug (5), a sand control screen (6), a second isolation packer (7), a sliding sleeve (8), a safety valve (9) and a hydraulic control pipeline (10); wherein,

[0026] The cable positioning seal (3) and the electric pulse unblocking device (4) are fixed in the housing through a second isolation packer (7), and there are more than two electric pulse unblocking devices (4);

[0027] The ground controller (1) is installed on the ground device, one end of the main steel pipe cable (2) is connected to the ground controller (1), and the other end passes through the cable positioning seal (3) and is connected to the steel pipe cable (4-3) of the electric pulse unblocking device (4);

[0028] The round plug (5) is installed at the lower end of the electric pulse unblocking device (4) at the lower end.

[0029] Optionally or preferably, in the above-mentioned multi-stage continuous liquid-electric pulse unblocking equipment, the upper and lower ends of the electric pulse unblocking device (4) are respectively provided with end threaded seals (4-1) sealedly connected to the outer shell (4-16), and the end threaded seals (4-1) are connected to the second isolation packer (7) by threads.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The controller (4-4) in the electric pulse unblocking device (4) can be set with different parameters for adjustment, thereby changing the single energy release of the electric pulse unblocking device and achieving variable intensity of electric pulse shock waves. This is different from the previous electric pulse unblocking devices, which maintain a fixed energy output for stable use and are not effective for areas with larger blockages. The controller (4) of this device can control the pulse discharge time and the intensity of a single pulse shock wave.

[0032] (2) A lightweight water-blocking round shell (4-14) is arranged in the cavity (4-11) of the electric pulse unblocking device (4), and the buoyancy of the liquid is used to change the sedimentation of the water-blocking round shell (4-14), thereby controlling the opening and closing of the perforation (4-12), so as to better store the liquid in the cavity (4-11). That is, the liquid medium is stored in the cavity (4-11) at a fixed time, and the perforation (4-12) is opened and closed at a fixed time to release the shock wave. Different from the previous use of magnetic suction devices and internal and external pressure difference devices, which not only occupy the internal space of the electrode, but also easily cause damage, once damaged, it cannot be used any more and needs to be lifted up and replaced, resulting in unnecessary economic waste. The present device has a simple structure and is stable and efficient.

[0033] (3) Electric pulse unblocking device (4) The pulse generator, capacitor, high-voltage rectifier and other controllers are integrated to achieve integration and a more complete structure. Different from the previous mode of well control and underground discharge, this will greatly reduce energy loss and improve unblocking efficiency.

[0034] (4) The multi-stage continuous liquid-electric pulse unblocking equipment realizes multi-stage pulse discharge by setting multiple electric pulse unblocking devices (4). Each electric pulse unblocking device can be adjusted by setting different parameters through the controller (4-4), forming a multi-dimensional unblocking area and adapting to various underground environments.

[0035] In summary, the device and equipment of the present invention have the advantages of continuous unblocking, safe structure, and long-term stable operation underground, which promotes the practical application of industrial electric pulse unblocking in underground wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the cross-sectional structure of a multi-stage continuous liquid-electric pulse unblocking equipment;

[0037] Figure 2 This is a schematic diagram of the cross-sectional structure of the electric pulse unblocking device.

[0038] Description of reference numerals:

[0039] 1: Ground controller, 2: Main steel pipe cable, 3: Cable positioning seal

[0040] 4: Electric pulse unblocking device, 4-1: End thread seal, 4-2: Cable through hole,

[0041] 4-3: Steel pipe cable, 4-4: Controller, 4-5: Energy storage capacitor,

[0042] 4-6: vacuum trigger device, 4-7: T-shaped positive electrode column, 4-8: positive electrode discharge end,

[0043] 4-9: Negative electrode discharge terminal, 4-10: T-shaped negative electrode column, 4-11: cavity,

[0044] 4-12: Perforation, 4-13: Annular filter, 4-14: Water blocking round shell,

[0045] 4-15: Insulation material, 4-16: Shell, 4-17: First isolation packer,

[0046] 5: round plug, 6: sand control screen, 7: second isolation packer,

[0047] 8: Sleeve, 9: Safety valve, 10: Hydraulic control pipeline. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is explained and illustrated in detail below in conjunction with the accompanying drawings and preferred embodiments, so that those skilled in the art can better understand the present invention and implement it.

[0049] Please refer to Figure 2 , an electric pulse unblocking device 4, the main structure of which includes an end threaded seal 4-1, a cable through hole 4-2, a steel pipe cable 4-3, a controller 4-4, an energy storage capacitor 4-5, a vacuum trigger device 4-6, a T-shaped positive electrode column 4-7, a positive electrode discharge end 4-8, a negative electrode discharge end 4-9, a T-shaped negative electrode column 4-10, a cavity 4-11, a perforation 4-12, an annular filter 4-13, a water blocking round shell 4-14, an insulating material 4-15, an outer shell 4-16 and a first isolation packer 4-17.

[0050] The outer shell 4-16 is a hollow cylinder, and the upper and lower ends of the outer shell 4-16 are sealed by end threaded seals 4-1 respectively. A cable through hole 4-2 is provided on the side wall of the outer shell 4-16 for the steel tube cable 4-3 to penetrate and fix the steel tube cable 4-3.

[0051] Inside the housing 4-16, the controller 4-4, the energy storage capacitor 4-5, the vacuum trigger device 4-6 and the positive electrode column 4-7 are connected in sequence from top to bottom through the steel pipe cable 4-3, and the negative electrode column 4-10 is correspondingly arranged below the positive electrode column 4-7. The positive electrode column 4-7 is T-shaped, and the front end is configured as a conical positive electrode discharge end 4-8, and the negative electrode column 4-10 is T-shaped, and the front end is configured as a conical negative electrode discharge end 4-9, and the front end is the end of the positive electrode column 4-7 and the negative electrode 4-10 facing each other.

[0052] Among them, the controller 4-4, the energy storage capacitor 4-5 and the vacuum trigger device 4-6 are all fixedly connected to the inner wall of the shell 4-16 through the first isolation packer 4-17. The positive electrode column 4-7 and the negative electrode column 4-10 are both fixedly connected to the inner wall of the shell 4-16 through the insulating material 4-15. The use of the first isolation packer 4-17 can ensure the safe distance between the components on the one hand, and also play a role in waterproof sealing. The positive electrode discharge end 4-8 and the negative electrode discharge end 4-9 extend out of the insulating material 4-15.

[0053] The insulating material 4-15 can enhance the rigidity and stability of the electrode, prevent the electrode from deformation or breakage, and prevent direct contact with other components, reducing the risk of mechanical wear and damage, while limiting the current to a set path and preventing the current from passing through unintended paths.

[0054] Insulating materials 4-15 can be fluororubber (such as polytetrafluoroethylene) and polyimide (such as PI). Polyimide has excellent high-temperature insulation performance and mechanical strength, can work stably for a long time in high-temperature environments, and has good chemical resistance. Fluororubber such as polytetrafluoroethylene has excellent voltage resistance and chemical stability, and can provide reliable insulation protection under high voltage and harsh environments.

[0055] A cavity 4-11 is formed between the insulating material 4-15 fixing the positive electrode column 4-7 and the negative electrode 4-10 for storing liquid, and the shell 4-16 is provided with a perforation 4-12 at the position of the cavity 4-11 for liquid to enter and exit the cavity 4-11.

[0056] A water-blocking round shell 4-14 is provided in the cavity 4-11. The water-blocking round shell 4-14 is a cylindrical shell structure including a side wall and a top surface. The side wall is attached to the outer shell 4-16 and can be moved up and down to open or cover the perforation 4-12. A through hole is provided in the middle of the top surface, and the through hole can correspond to the positive electrode column 4-7. The outer shell 4-16 is not sealed at the position above the side wall of the cavity 4-11 to allow liquid to flow. An annular filter 4-13 is provided to filter out liquid impurities, and the filtered liquid can enter the cavity 4-11.

[0057] The through hole on the top surface of the water blocking round shell 4-14 is slightly lowered so that the outer circumference of the top surface is tilted downward toward the through hole, and the tilt angle is 3-5 degrees. The liquid medium entering through the annular filter screen 4-13 will flow from the through hole in the middle of the water blocking round shell 4-14 to the cavity 4-11 due to the existence of the tilt angle.

[0058] The water-blocking round shell 4-14 is made of a material with a density less than that of water, preferably composed of carbon fiber reinforced polymer on the outside and filled with foam material on the inside. Since the overall density of the water-blocking round shell 4-14 is less than the density of water, the injected liquid uses buoyancy to lift the water-blocking round shell 4-14, and the floating water-blocking round shell 4-14 will open the blocked perforation 4-12 area. The perforation 4-12 is preferably located in the middle position of the cavity 4-11 in the vertical direction, which is also the middle position of the plasma channel, so that the shock wave can act on the well wall to the greatest extent.

[0059] By utilizing the buoyancy of the liquid to change the settlement of the water plugging round shell 4-14, and then controlling the opening and closing of the perforation 4-12, the liquid can be better stored in the cavity.

[0060] At present, most electric pulse unblocking devices have the following problems: in order to release the shock wave generated by the liquid-electric effect, it is necessary to open perforations around the electrode cavity, and the size of the aperture will affect the intensity of the shock wave. In order to release as many shock waves as possible, it is necessary to open large-sized perforations, but too large an aperture will make it impossible to store liquid media in the cavity. Opening small-sized perforations can store liquid media, but it greatly reduces the intensity of the liquid-electric shock wave. If the aperture is too small, it will also hinder the propagation of the shock wave, which will also reduce the intensity of the shock wave and weaken the unblocking effect. The two cannot be taken into account at the same time. The water-blocking round shell 4-14 of the present invention can properly solve these two problems and release the shock wave to the greatest extent while ensuring that there is sufficient liquid. The specific aperture can be set according to the actual situation.

[0061] Please refer to Figure 1 A multi-stage continuous hydraulic-electric pulse unblocking equipment includes a shell, in which a ground device and a drill string are installed, as well as a ground controller 1, a main steel pipe cable 2, a cable positioning seal 3, an electric pulse unblocking device 4, a round plug 5, a sand control screen 6, a second isolation packer 7, a sliding sleeve 8, a safety valve 9 and a hydraulic control pipeline 10.

[0062] Among them, the ground device is located above the ground, mainly playing the role of ground support, blowout prevention and isolation, and the drill string plays the role of overall penetration and torque transmission.

[0063] The cable positioning seal 3 and the electric pulse unblocking device 4 are fixed in the shell through the second isolation seal 7. The electric pulse unblocking devices 4 are three connected in series from top to bottom, and the adjacent electric pulse unblocking devices 4 are connected through the steel pipe cable 4-3. The second isolation seal 7 is connected to both ends of the electric pulse unblocking device 4. The end thread seal 4-1 of the electric pulse unblocking device 4 is provided with an external thread, and the second isolation seal 7 is provided with an internal thread. The two are connected by threads to achieve the effect of fixing and sealing. The cable positioning seal 3 is filled between the adjacent electric pulse unblocking devices 4 to play the role of support and sealing.

[0064] One end of the main steel pipe cable 2 is connected to the ground controller 1, and the other end passes through the cable positioning seal 3 and is connected to the steel pipe cable 4-3 of the electric pulse unblocking device 4. When there are multiple electric pulse unblocking devices 4, the main steel pipe cable 2 is respectively connected to the steel pipe cable 4-3 of each electric pulse unblocking device 4. That is, the ground controller 1 can control each electric pulse unblocking device 4 separately.

[0065] The round plug 5 is installed at the lower end of the electric pulse unblocking device 4 at the lower end, and is mainly used to control the flow of fluid in the wellbore or prevent the intrusion of drilling fluid in the wellbore.

[0066] The sand-proof screen 6 is arranged around the electric pulse plugging removal device 4 to prevent sediments such as sand particles from entering the wellbore.

[0067] The sleeve (8) and the safety valve (9) are installed on the drill string. One end of the hydraulic control line (10) is connected to the ground device, and the other end is connected to the safety valve (9). The 10-hydraulic control line controls the 9-safety valve, which will open and release pressure when the pressure exceeds the preset limit. The 8-sleeve is installed on the drill string to control the flow of liquid and channel selection in the drill string.

[0068] When in use, the ground controller 1 is connected through the main steel pipe cable 2 to transmit the pulse signal, and the cable positioning seal 3 ensures the sealing performance of the cable penetration and provides accurate positioning of the cable. The electric pulse signal is transmitted to the electric pulse unblocking device 4, and a series of controls are performed in the device to generate a liquid-electric shock wave, which continuously acts on the well wall blockage to play a role in unblocking. There are multiple electric pulse unblocking devices 4, which can be controlled separately by the ground controller 1 to achieve multi-stage pulse discharge, form a multi-dimensional unblocking area, and adapt to various underground environments.

[0069] The specific control methods are as follows:

[0070] The ground power supply equipment provides 220V or 380V voltage, which is transmitted to the main steel pipe cable 2 through the cable, and then transmitted to the underground steel pipe cable 4-3. The steel pipe cable 4-3 passes through the cable through hole 4-2 and enters the electric pulse unblocking device 4. The steel pipe cable 4-3 is first connected to the controller 4-4, and then connected to the energy storage capacitor 4-5 and the vacuum trigger device 4-6. The controller 4-4 changes the parameters such as voltage and frequency through high-voltage rectification and other technologies to control the energy storage time and the amount of energy released by the energy storage capacitor 4-5. When the energy storage capacitor 4-5 reaches the preset value, the vacuum trigger device 4-6 is triggered to form a path and complete a single pulse discharge.

[0071] When there is no liquid in the cavity 4-11, the water-blocking round shell 4-14 will slide onto the insulating material 4-15 due to gravity, just blocking the perforation 4-12. When the liquid in the pipeline passes through the annular filter 4-13 and continuously flows into the cavity 4-11, the buoyancy of the liquid will continuously lift the water-blocking round shell 4-14, and when it is lifted to the top, the perforation 4-12 is completely opened.

[0072] The high-energy pulse of the vacuum trigger device 4-6 is transmitted to the T-shaped positive electrode column 4-7. Due to the conical structure of the positive electrode discharge end 4-8 and the negative electrode discharge end 4-9, a plasma pulse channel is easily formed. At the same time, the liquid-electric effect generates a shock wave in the cavity 4-11 filled with liquid, which acts on the well wall blockage, and the liquid in the cavity 4-11 will also be discharged due to the shock wave pressure. The water-blocking round shell 4-14 loses buoyancy and falls again, blocking the perforation area 4-12 again, and the liquid in the pipeline is poured into the cavity 4-11 again through the annular filter 4-13. After a single discharge is completed, the controller 4-4 will also re-store energy to prepare for the next pulse discharge, so that the electric pulse unblocking device 4 starts a cyclic discharge, and the liquid-electric shock wave continuously acts on the blockage.

[0073] The upper and lower ends of the electric pulse unblocking device 4 are threaded, which is easy to install, and multiple unblocking devices can be laid underground. In addition, the controller 4-4 can also set different parameters, such as triggering once every minute, with a single trigger energy of 2kJ; triggering once every 2 minutes, with a single trigger energy of 4kJ; triggering once every 3 minutes, with a single trigger energy of 5kJ, etc. In this way, multi-dimensional pulse unblocking can be formed, greatly improving the unblocking efficiency.

[0074] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. An electric pulse unblocking device, comprising a housing (4-16), characterized in that: The housing (4-16) includes a controller (4-4), an energy storage capacitor (4-5), a vacuum trigger device (4-6) and a positive electrode column (4-7) which are connected in sequence through a steel pipe cable (4-3), and a negative electrode column (4-10) is correspondingly provided below the positive electrode column (4-7); The positive electrode column (4-7) and the negative electrode column (4-10) are both fixed in the outer shell (4-16) by means of an insulating material (4-15); a cavity (4-11) is formed between the insulating materials (4-15) that fix the positive electrode column (4-7) and the negative electrode column (4-10) for storing liquid; and the outer shell (4-16) is provided with perforations (4-12) at the position of the cavity (4-11) for liquid to enter and exit the cavity (4-11); A water-blocking round shell (4-14) is provided in the cavity (4-11), the water-blocking round shell (4-14) being a cylindrical shell structure including a side wall and a top surface, the side wall being in contact with the outer shell (4-16) and being movable up and down to open or cover the perforation (4-12), a through hole being provided in the middle of the top surface, the through hole being capable of correspondingly passing through the positive electrode column (4-7); the outer shell (4-16) is not sealed at a position above the side wall of the cavity (4-11) to allow liquid to flow; the water-blocking round shell (4-14) is made of a material having a density less than that of water; The positive electrode column (4-7) is T-shaped, and the front end is a tapered positive electrode discharge end (4-8); the negative electrode column (4-10) is T-shaped, and the front end is a tapered negative electrode discharge end (4-9); the front end is the end portion of the positive electrode column (4-7) and the negative electrode column (4-10) facing each other; The outer shell (4-16) is also provided with an annular filter screen (4-13) at a position above the side wall of the cavity (4-11); It also includes a first isolation packer (4-17), and the controller (4-4), energy storage capacitor (4-5) and vacuum trigger device (4-6) are all fixed in the shell (4-16) through the first isolation packer (4-17); the shell (4-16) is also provided with a cable through hole (4-2) for the steel pipe cable (4-3) to pass through.

2. The electric pulse unblocking device according to claim 1, characterized in that: The water blocking round shell (4-14) is made of a carbon fiber reinforced polymer to form an outer skin and a foam material to be filled inside.

3. The electric pulse unblocking device according to claim 1, characterized in that: The through hole on the top surface of the water blocking round shell (4-14) is slightly lowered so that the outer circumference of the top surface is inclined downward in the direction of the through hole, and the inclination angle is 3-5°.

4. The electric pulse unblocking device according to any one of claims 1 to 3, characterized in that: The insulating material (4-15) is fluororubber and / or polyimide.

5. A multi-stage continuous liquid-electric pulse unblocking device, comprising a housing, characterized in that: The housing is provided with a ground device and a drill string, as well as a ground controller (1), a main steel pipe cable (2), a cable positioning seal (3), an electric pulse unblocking device (4) as claimed in any one of claims 1 to 3, a round plug (5), a sand control screen (6), a second isolation packer (7), a sliding sleeve (8), a safety valve (9) and a hydraulic control pipeline (10); wherein: The cable positioning seal (3) and the electric pulse unblocking device (4) are fixed in the housing through a second isolation packer (7), and there are more than two electric pulse unblocking devices (4); The ground controller (1) is installed on the ground device, one end of the main steel pipe cable (2) is connected to the ground controller (1), and the other end passes through the cable positioning seal (3) and is connected to the steel pipe cable (4-3) of the electric pulse unblocking device (4); The round plug (5) is installed at the lower end of the electric pulse unblocking device (4) at the lower end.

6. The multi-stage continuous liquid-electric pulse unblocking equipment according to claim 5 is characterized in that: The upper and lower ends of the electric pulse unblocking device (4) are respectively provided with end thread seals (4-1) which are sealedly connected to the outer shell (4-16), and the end thread seals (4-1) are connected to the isolation packer (7) via threads.

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