An electric explosion unblocking test device

Abstract

The application discloses a kind of electric explosion unblocking test devices, it is related to screen pipe unblocking test technical field, including setting on the bench mixing system, three-phase flow generation system, impact unblocking test cylinder, data acquisition system, electric explosion control cabinet;The mixing system is used to prepare and save the circulating slurry used in test;Three-phase flow generation system is used to mix slurry with compressed air and form gas, liquid, solid three-phase fluid in homogenizing cylinder;Impact unblocking test cylinder and electric explosion control cabinet are used to simulate screen pipe plugging and unblocking process with three-phase fluid;The data acquisition system is used to detect and transmit the temperature, pressure, flow and differential pressure and other data of simulated screen pipe plugging and unblocking test process.The application can simulate screen pipe plugging process and unblocking process, monitor pressure, temperature, differential pressure and other parameters in screen pipe plugging and unblocking process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screen pipe plugging test, in particular to an electric explosion plugging test device. BACKGROUND

[0002] In oil and gas (natural gas hydrate) production wells and dissolution method production wells (such as potassium salt, natural soda, mirabilite, well salt, etc.), due to the destruction of the reservoir skeleton during the production process, a large number of mud and sand particles in the reservoir will inevitably change from a bound state to a free state, forming reservoir sand production and gathering with the fluid around the wellbore, resulting in screen pipe plugging, hindering the movement of fluid in the well, and directly restricting the production and life cycle of the production well. Therefore, plugging means must be taken to restore the production capacity of the production well and avoid the occurrence of early well shut-in, well abandonment and other situations caused by screen pipe plugging, so as to protect the life cycle of the production well and help stable production growth.

[0003] In fact, screen pipe sand plugging caused by reservoir sand production is very common and frequent, and chemical and physical methods have been developed for screen pipe sand plugging in production layers. The chemical method mainly includes conventional acid and retarded acid treatment method, which injects chemical reagents into the bottom of the well to react with the substances plugging the screen pipe to dissolve them, thereby achieving the purpose of dredging the well. The chemical plugging technology is very mature and widely used in oil and gas production wells, but it has the problem that the plugging effect decreases significantly with the increase of acid washing times, and it also causes environmental pollution, which limits its application in environments with high environmental protection requirements. In comparison, the physical method has no environmental pollution problem and has obvious environmental adaptability advantages, mainly including ultrasonic oscillation, high-pressure water jet, hydraulic oscillation, electric explosion impact and other technical methods. The electric explosion plugging method has the advantages of controllable energy, no pollution and simple operation, and has become a plugging technology method with obvious application and promotion potential, especially in natural gas hydrate production wells and dissolution method production wells. Its controllable energy feature can reduce the impact of plugging on the fragile well wall and avoid accidents in the well.

[0004] For the electric explosion screen pipe plugging process, there are currently few reports on test devices that can simulate the screen pipe plugging process and the plugging process. It is impossible to quantitatively evaluate the screen pipe plugging effect and the electric explosion screen pipe plugging effect, and it is even more impossible to monitor the dynamic changes of screen pipe plugging and plugging. Therefore, it is urgent to develop a test device that can monitor the dynamic process of screen pipe plugging and plugging, has the function of providing "solid-liquid" two-phase fluid and "solid-liquid-gas" three-phase fluid circulating medium, and can quantitatively evaluate the plugging and electric explosion plugging of screen pipes in oil and gas wells and dissolution method production wells, providing a basis for plugging technology optimization, new technology research and development, and field process development. SUMMARY

[0005] The electric explosion unblocking test device of the present application comprises a mixing system, a three-phase flow generating system, an impact unblocking test cylinder, a data acquisition system and an electric explosion control cabinet.

[0006] To achieve the above-mentioned object, the present application provides the following solutions.

[0007] The electric explosion unblocking test device of the present application comprises a mixing system, a three-phase flow generating system, an impact unblocking test cylinder, a data acquisition system and an electric explosion control cabinet.

[0008] Optionally, the impact unblocking test cylinder has a T-shaped structure and comprises a vertical chamber and a horizontal chamber which are in communication, and a filter section is arranged at the communication part of the horizontal chamber and the vertical chamber, the filter section is used for simulating the sand blocking medium of the screen pipe, the fluid flows out after being filtered by the filter section, and the solid phase particles are embedded or adhered to the surface of the sand blocking medium of the filter section to cause blocking; the electric explosion control cabinet is connected with an electrode arranged in the vertical chamber; and the data acquisition system is connected with the impact unblocking test cylinder.

[0009] Optionally, the mixing system comprises a stirring cylinder, in an optimal embodiment, the stirring cylinder has a heating function and is made of stainless steel; a speed reducer motor is arranged above the stirring cylinder, the speed reducer motor is in transmission connection with a stirring rod arranged in the stirring cylinder and can be used as a stirrer to prepare and store the circulating slurry (drilling fluid composed of solid-liquid two phases) used in the test; in order to ensure that the pump is not blocked and the safety of the test pressure system, an outlet is arranged on one side of the vertical chamber, the outlet flow is controlled by a valve, and the pressure difference between the inside and outside of the screen pipe can be adjusted to form the environmental pressure; the stirring cylinder is connected with the outlet on the side wall of the horizontal chamber through a first pipeline, and the stirring cylinder is connected with the outlet on the side wall of the vertical chamber through a second pipeline; control valves are respectively arranged on the first pipeline and the second pipeline, a one-way pressure regulating valve is arranged at the outlet end of the horizontal chamber to ensure that the environmental pressure does not exceed the limit and affects the safety of the device, the pressure regulating valve is set to the upper limit of the allowable environmental pressure, and when the environmental pressure exceeds the allowable environmental pressure, the fluid in the chamber is discharged through the outlet.

[0010] Optionally, the three-phase flow generating system comprises a mud pump, an air compressor and a homogenizing cylinder connected by a three-way pipe, the mud pump extracts the homogenized fluid in the mud tank and injects into the three-way pipe, and the air compressor injects compressed air into the three-way pipe to form a gas-liquid-solid three-phase fluid in the homogenizing cylinder, the drilling fluid flow can be determined by different displacements of the mud pump, and the gas flow can be controlled by a throttle valve, so as to realize different ratios of the drilling fluid and the gas flow; the inlet of the mud pump is connected with the stirring cylinder through a pipeline, and the outlet of the homogenizing cylinder is communicated with the inlet of the horizontal bin through a pipeline.

[0011] Optionally, the first end cover is fixedly and sealingly connected at the top of the vertical bin, a sealing gasket is installed therebetween to realize sealing, and the electrode is inserted into the first end cover; the horizontal bin is fixedly and sealingly connected with an extension cylinder at the end, the extension cylinder can be configured with different numbers as needed to meet the needs of measuring the changes of the pressure and temperature along the pipeline, the second end cover is fixedly arranged at the end of the extension cylinder, and a feed inlet connected with the homogenizing cylinder is formed in the second end cover; the filter section comprises a sand blocking cylinder arranged in the horizontal bin, and sand blocking medium is arranged in the sand blocking cylinder.

[0012] Optionally, the data acquisition system comprises an acquisition instrument, a pressure sensor, a temperature sensor, a differential pressure sensor and a flow sensor, the pressure sensor and the temperature sensor are arranged in the vertical bin and the horizontal bin, the differential pressure sensor is arranged on both sides of the sand blocking medium of the sand blocking cylinder, and the flow sensor is arranged at the feed inlet of the second end cover; the pressure sensor, the temperature sensor, the differential pressure sensor and the flow sensor are electrically connected with the acquisition instrument, and the acquisition instrument comprises a data acquisition system and an oscilloscope; specifically, the pressure sensor comprises a conventional pressure sensor and a high-frequency pressure sensor, the high-frequency pressure sensor is used for measuring the controllable plasma shock waveform, energy efficiency and the pressure change at the moment of impact unblocking; the data acquisition uses a conventional data acquisition system and an oscilloscope, the conventional data acquisition system is used for conventional low-frequency data acquisition, and the oscilloscope can collect the measurement signals of the high-frequency pressure sensor in time; the electric explosion control cabinet is connected with the discharge electrode, and a plasma channel is formed after the discharge electrode is short-circuited after being electrified, and then the electric explosion shock wave is implemented to unblock.

[0013] Optionally, the electrode sleeve with open ends is threadedly connected to the first end cover, the electrode is threadedly fixed in the electrode sleeve, the electrode sleeve is made of an insulating material, polytetrafluoroethylene is used to ensure sufficient strength and insulation effect, and the inner hole thread and the outer thread of the electrode sleeve are both installed with insulating glue to ensure the sealing effect.

[0014] Optionally, the vertical tank bottom is provided with a fluid outlet, and an outlet valve is fixedly installed at the fluid outlet; during the test, the outlet valve is ensured to be in a closed state, and after the test, the outlet valve can be opened for cleaning the inside of the tank.

[0015] Optionally, an inner thread is formed on the inner wall of the sand blocking cylinder, and a mesh supporting plate is fixedly arranged at the end of the sand blocking cylinder close to the electrode to prevent the sand blocking medium (sieve plate) from being blocked to cause the pressure difference between the two sides to be too large to damage the sand blocking sieve plate; a locking nut is threadedly and fixedly connected to the end of the sand blocking cylinder away from the electrode to fix the components such as the filter screen, rubber ring, filler cylinder and pressure ring in the sand blocking cylinder, and the sand blocking medium is arranged between the mesh supporting plate and the locking nut; the sand blocking medium comprises a plurality of filter screens arranged in the sand blocking cylinder in sequence, and a filler cylinder is selectively arranged between two adjacent filter screens; the filler cylinder is filled with ceramsite, and sieve plates are arranged on the two sides of the filler cylinder to fill ceramsite in the middle to simulate a pre-filled screen pipe; the two measuring ends of the pressure difference sensor are located on the two sides of the sand blocking medium to measure the pressure difference and directly reflect the blocking state of the sand blocking medium; a rubber ring is arranged between the filler cylinder and the filter screen.

[0016] Optionally, two lengthening cylinders are fixedly connected to the ends of the horizontal tank, and the two lengthening cylinders are fixedly connected through bolts; since the sand blocking cylinder needs to be frequently disassembled and the sand blocking medium needs to be replaced, a supporting rod is arranged at the joint of the two lengthening cylinders, a sliding block is arranged at the lower part of the supporting rod, the sliding block is slidingly arranged in a sliding channel, and the sliding channel is fixed to a rack or a table top; through the movement of the sliding channel, the flange of the lengthening cylinder and the flange of the end of the horizontal tank can be connected and separated to realize quick disassembly and assembly; a sensor interface is reserved on the side wall of the lengthening cylinder, and the required sensor can be arranged on the sensor interface to collect corresponding data; when the sensor is not used, a plug wire can be used for plugging; a plurality of groups of lengthening cylinders can be arranged, and corresponding sensors are matched to collect the parameters of the electric explosion shock wave in the horizontal direction.

[0017] The present application has the following technical effects compared with the prior art:

[0018] The present application can simulate the screen pipe blocking process and the unblocking process, monitor the parameters such as pressure, temperature and pressure difference in the screen pipe blocking and unblocking process, and quantitatively analyze and evaluate the screen pipe blocking state and unblocking effect. The present application has the simulation functions of single fluid medium, solid-liquid two-phase flow medium and solid-liquid gas three-phase flow medium, has the characteristics of adjustable and controllable environmental pressure (pressure difference between the two sides of the screen pipe), and can be used for simulating the screen pipe blocking and unblocking in different environments such as oil and gas wells, solution mining wells and natural gas hydrate mining wells. At the same time, the present application can realize real-time monitoring of the blocking and unblocking process, can be used for evaluating the unblocking effect of various unblocking methods under different process parameters, can provide a preliminary research basis and support for field application, and has relatively wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 It is a schematic diagram of the arrangement of the electric explosion plugging test device of the present application.

[0021] Figure 2 It is a schematic diagram of the impact plugging test cylinder structure of the electric explosion plugging test device of the present application.

[0022] Figure 3 It is a schematic diagram of the internal structure arrangement of the sand blocking cylinder of the electric explosion plugging test device of the present application.

[0023] Figure 4 It is a schematic diagram of the mesh support plate structure of the electric explosion plugging test device of the present application.

[0024] Figure 5 It is a side view of the first end cover of the electric explosion plugging test device of the present application.

[0025] Figure 6 It is a top view of the first end cover of the electric explosion plugging test device of the present application.

[0026] Figure 7 It is a schematic diagram of the electrode sleeve structure of the electric explosion plugging test device of the present application.

[0027] Figure 8 It is a schematic diagram of the electric explosion plugging test device of the present application. Figure 3

[0028] Explanation of reference numerals: 1-impact plugging test cylinder, 101-vertical bin, 102-horizontal bin, 2-data acquisition system, 3-electric explosion control cabinet, 4-filtering section, 401-sand blocking cylinder, 5-first end cover, 6-electrode, 7-elongated cylinder, 8-second end cover, 9-homogenizing cylinder, 10-feeding port, 11-supporting rod, 12-sliding block, 13-slideway, 14-electrode sleeve, 15-stirring cylinder, 16-first outlet, 17-fluid outlet, 18-mud pump, 19-air compressor, 20-rubber ring, 21-pressure sensor, 22-temperature sensor, 23-pressure difference sensor, 24-mesh support plate, 25-locking nut, 26-filter screen, 27-packing cylinder, 28-second outlet, 29-pressing ring, 30-first pipeline, 31-second pipeline. DETAILED DESCRIPTION

[0029] ​The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The purpose of this invention is to provide an electrical explosion unblocking test device to solve the problems existing in the prior art. It can simulate the screen tube blockage process and unblocking process, and monitor parameters such as pressure, temperature, and pressure difference during the screen tube blockage and unblocking process.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Appendix Figure 1 As shown, this invention provides an electro-explosion unblocking test device, including a mixing system, a three-phase flow generation system, an impact unblocking test cylinder 1, a data acquisition system 2, and an electro-explosion control cabinet 3, all mounted on a test bench. The mixing system is used to prepare and store the circulating slurry used in the test. The three-phase flow generation system is used to mix the slurry with compressed air and form a gas-liquid-solid three-phase fluid in a homogenizing cylinder. The impact unblocking test cylinder 1 and the electro-explosion control cabinet 3 are used to simulate the screen tube blockage and unblocking process with the three-phase fluid. The data acquisition system 2 is used to detect and transmit data such as temperature, pressure, flow rate, and pressure difference during the simulated screen tube blockage and unblocking test process.

[0033] This invention enables the conduct of electro-explosive screen unblocking tests under both solid-liquid two-phase and solid-liquid-gas three-phase fluid circulation conditions. It obtains data on changes in parameters such as pressure difference, pressure, and temperature during the screen unblocking and unblocking processes, facilitating scientific research, process verification, and effect analysis. The invention also features a high-frequency explosive pressure testing sensor, which can quantitatively evaluate the impact effect of electro-explosives under different occurrence parameters and conduct energy efficiency characteristic analysis. It provides a basic platform for indoor electro-explosive unblocking tests, thereby providing fundamental data and technical support for the development of downhole impactors for electro-explosive screen unblocking and the formulation of field application processes. This invention can contribute to screen unblocking in oil and gas wells, screen unblocking in wells using the dissolution method, and the trial production and industrialization of natural gas hydrates.

[0034] Specifically, such as Figure 2As shown, the impact deblocking test cylinder 1 is T-shaped structure, including the vertical bin 101 and horizontal bin 102, the horizontal bin 102 is provided with a filter section 4 at the communication with the vertical bin 101, the filter section 4 is used to simulate the screen pipe sand retaining medium, the fluid is filtered through the filter section 4 and flows out, the solid phase particles are embedded or adhered to the surface of the filter section sand retaining medium to cause the blockage; the first end cover 5 is fixedly and sealingly connected at the top of the vertical bin 101, the structure of the first end cover 5 is as shown in Figure 5 and Figure 6 As shown, the sealing washer is installed between the two to realize the sealing, and the electrode 6 is inserted on the first end cover 5; the elongated cylinder 7 is fixedly and sealingly connected at the end of the horizontal bin 102, the elongated cylinder 7 can be configured with different numbers according to the needs to meet the needs of the test on the change measurement of the pressure and temperature along the way, the second end cover 8 is fixedly provided at the end of the elongated cylinder 7, and the feed inlet 10 connected with the homogenizing cylinder 9 is opened on the second end cover 8; in the embodiment, preferably, two elongated cylinders 7 are fixedly connected at the end of the horizontal bin 102, and the two elongated cylinders 7 are fixedly connected through bolts; since the sand retaining cylinder needs to be frequently disassembled and the sand retaining medium needs to be replaced, the support rod 11 is installed at the connection of the two elongated cylinders 7, the lower part of the support rod 11 is provided with the sliding block 12, the sliding block 12 is slidingly arranged in the slide 13, and the slide 13 is fixed on the rack or the table top; through the movement of the sliding block 12 on the slide 13, the flange of the elongated cylinder 7 and the end flange of the horizontal bin 102 can be connected and separated, and the quick disassembly and assembly can be realized. The sensor interface is reserved on the side wall of the elongated cylinder 7, which can be used to install the required sensor to collect the corresponding data, and the plug wire can be used for plugging when the sensor is not used; the filter section 4 includes the sand retaining cylinder 401 arranged in the horizontal bin 102, and the sand retaining medium is arranged in the sand retaining cylinder 401; the electrode 6 arranged in the vertical bin 101 is connected with the electric explosion control cabinet 3, the electrode 6 is a high-voltage discharge electrode, the electric explosion control cabinet 3 is connected with the discharge electrode, and the controllable plasma shock wave generator is connected with the discharge electrode. After power-on, the discharge electrode is short-circuited to form a controllable plasma channel, and then the shock wave is generated to implement deblocking; the electrode sleeve 14 with two open ends is threadedly connected on the first end cover 5, the structure of the electrode sleeve 14 is as shown in Figure 7 The electrode 6 is threadedly fixed in the electrode sleeve 14, the electrode sleeve 14 is made of insulating material, polytetrafluoroethylene can be used to ensure sufficient strength and insulation effect, and the insulating glue is used for the thread installation of the inner hole and the outer thread of the electrode sleeve 14 to ensure the sealing effect.

[0035] The mixing system comprises a stirring barrel 15, which in the embodiment is made of stainless steel and has a heating function; a speed reducer motor is arranged above the stirring barrel 15, and the speed reducer motor is in transmission connection with a stirring rod arranged in the stirring barrel 15, which can be used as a stirrer for preparing and storing the circulating slurry (drilling fluid composed of solid and liquid phases) used in the test; in order to prevent the occurrence of pump blocking and ensure the safety of the test pressure system, an outlet is arranged at each of the vertical bin 101 and the horizontal bin 102, the outlet comprises a first outlet 16 and a second outlet 28, one first outlet 16 is arranged on one side of the vertical bin 101, the flow of the first outlet 16 is controlled by a valve, and the pressure difference between the inside and outside of the screen pipe can be adjusted to form an environmental pressure; the stirring barrel 15 is connected with the outlet on the side wall of the horizontal bin 102 through a first pipeline 30, and the stirring barrel 15 is connected with the outlet on the side wall of the vertical bin 101 through a second pipeline 31; in order to ensure that the environmental pressure does not exceed the limit and affect the safety of the device, a one-way pressure regulating valve is arranged at the second outlet 28 arranged at the end of the horizontal bin 102, the pressure regulating valve is set to the upper limit of the environmental pressure, and when the environmental pressure exceeds the allowable environmental pressure, the fluid in the bin is discharged through the outlet; control valves are arranged on the first pipeline 30 and the second pipeline 31; a fluid outlet 17 is arranged at the bottom of the vertical bin 101, and an outlet valve is fixedly arranged at the fluid outlet 17; during the test, the outlet valve is kept in a closed state, and after the test, the outlet valve can be opened for cleaning the inside of the bin.

[0036] The three-phase flow generating system comprises a mud pump 18, an air compressor 19 and a homogenizing barrel 9 which are communicated through a three-way pipe; the mud pump 18 draws the homogenized fluid in the mud pool or the stirring barrel and injects the homogenized fluid into the three-way pipe, and the air compressor 19 injects compressed air into the three-way pipe to form a gas-liquid-solid three-phase fluid in the homogenizing barrel 9; the drilling fluid flow can be determined by different displacements of the mud pump, and the gas flow can be controlled by a throttle valve, so that different ratios of the drilling fluid and the gas flow can be realized; the inlet of the mud pump is connected with the stirring barrel through a pipeline, and the outlet of the homogenizing barrel is communicated with the inlet of the horizontal bin through a pipeline.

[0037] The data acquisition system comprises an acquisition instrument, a pressure sensor 21, a temperature sensor 22, a differential pressure sensor 23 and a flow sensor, the pressure sensor 21 and the temperature sensor 22 are arranged in the vertical bin 101 and the horizontal bin 102, the differential pressure sensor 23 is arranged on both sides of the sand blocking medium of the sand blocking cylinder 401, and the flow sensor is arranged at the feed inlet 10 of the second end cover 8; the pressure sensor 21, the temperature sensor 22, the differential pressure sensor 23 and the flow sensor are electrically connected with the acquisition instrument, and the acquisition instrument comprises a data acquisition system and an oscilloscope; specifically, the pressure sensor comprises a conventional pressure sensor and a high-frequency pressure sensor, the high-frequency pressure sensor is used for controllable plasma shock waveform measurement, energy efficiency analysis and impact unblocking instantaneous pressure change. The data acquisition uses a conventional data acquisition system and an oscilloscope or a high-frequency data acquisition system, the conventional data acquisition system is used for conventional low-frequency data acquisition, and the oscilloscope or the high-frequency data acquisition system can collect high-frequency pressure sensor measurement signals in time. The controllable plasma shock wave generator (control cabinet) is connected with the discharge electrode, a controllable plasma channel is formed after short circuit of the discharge electrode after power-on, and then an impact wave is generated to implement unblocking.

[0038] As shown in Figure 3 , Figure 4 and Figure 8 , an inner thread is formed on the inner wall of the sand blocking cylinder 401, and a mesh supporting plate 24 is fixedly arranged at one end of the sand blocking cylinder 401 close to the electrode 6, so as to prevent the sand blocking medium (screen plate) from being blocked to cause excessive pressure difference on both sides and damage the sand blocking screen plate; a locking nut 25 is threadedly fixedly connected at one end of the sand blocking cylinder 401 away from the electrode 6, for fixing components such as a filter screen, a rubber ring, a filler cylinder and a pressure ring in the sand blocking cylinder 401, the sand blocking medium is arranged between the mesh supporting plate 24 and the locking nut 25, and a pressure ring 29 is arranged between the locking nut 25 and the sand blocking medium, so as to facilitate sealing and limiting the sand blocking medium; the sand blocking medium comprises a plurality of filter screens 26 (three are shown in the figure) arranged in the sand blocking cylinder 401 in sequence, and a filler cylinder 27 can be selectively arranged between two adjacent filter screens 26, the filler cylinder 27 is filled with ceramsite, and a screen plate can be installed on both sides of the filler cylinder 27, the ceramsite is filled in the middle, the pre-filled screen pipe is simulated, two measurement ends of the differential pressure sensor are located on both sides of the sand blocking medium, so as to measure the pressure difference and directly reflect the blocking state of the sand blocking medium; the rubber ring 20 is arranged between the filler cylinder 27 and the filter screen 26, so as to increase the sealing property of the connection.

[0039] Example one

[0040] The embodiment is based on the above technical solution to simulate the screen pipe plugging process and the plugging removal process, monitor the pressure, temperature, pressure difference and other parameters in the screen pipe plugging and plugging removal process, and quantitatively analyze and evaluate the screen pipe plugging state and the plugging removal effect. Specifically, the electric explosion energy efficiency test: using the above device, the electric explosion test can be carried out not only in a liquid environment (static or circulating state), but also in a "solid-liquid" two-phase fluid and a "solid-liquid-gas" three-phase fluid circulating state. By using different discharge methods (metal wire discharge, gap discharge, metal wire discharge with energy-containing material), the electric explosion test is carried out by setting different electric explosion parameters such as discharge voltage. The instantaneous shock wave generated by electric explosion can be measured by a high-frequency blasting pressure sensor to obtain a time sequence signal, and based on the time sequence signal, a shock wave type can be drawn, and the relationship between the shock wave peak value, the decay time and the electric explosion generation parameters can be further analyzed to evaluate the energy utilization efficiency.

[0041] Screen pipe plugging process simulation: using the above device, artificial plugging test can be carried out under the circulation of "solid-liquid" two-phase fluid and "solid-liquid-gas" three-phase fluid. Different types, different formulations, and different solid phase particle sizes of drilling fluids are configured, and under different flow rates, different sand blocking media such as screen meshes of different diameters, sand blocking cylinders containing different particle size ceramsite (equivalent to pre-packed screen pipes), wire-wound screen plates, and slotted screen meshes are artificially plugged, the pressure and pressure difference change process of the sand blocking medium on both sides of the sand blocking medium from unblocked, half-blocked to fully blocked is monitored, the plugging law of the solid phase particles of the drilling fluid to the sand blocking medium is studied, and the sand blocking effect of different sand blocking media on different drilling fluids and different "solid-liquid-gas" three-phase flow is evaluated.

[0042] Electric explosion screen pipe plugging removal effect test: based on the screen pipe plugging process simulation test, after the sand blocking medium is plugged by the solid phase of the drilling fluid, the electric explosion can be used for impact plugging removal. The pressure and pressure difference on both sides of the sand blocking medium are monitored by pressure sensors and pressure difference sensors to quantitatively evaluate the plugging state of the sand blocking medium and evaluate the electric explosion impact plugging removal effect. The electric explosion plugging removal can be carried out under the circulation of "solid-liquid" two-phase fluid and "solid-liquid-gas" three-phase fluid, and can be tested and evaluated for different flow rates, different environmental pressures, different sand blocking media, and different electric explosion intensities. For different electric explosion types, the plugging removal effects of gap discharge, metal wire discharge, and metal wire discharge with energy-containing material can be evaluated, and the plugging removal effects of single electric explosion impact and multiple electric explosion impacts, and cyclic electric explosion impact can be tested and evaluated.

[0043] Other plugging removal method test and evaluation: using high-precision temperature sensors, the temperature change in the bin can also be monitored, and the thermal effect of electric explosion can be evaluated under the circulation of "solid-liquid" two-phase fluid and "solid-liquid-gas" three-phase fluid.

[0044] In the description of the present application, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0045] The principles and implementation modes of the present application are described by applying specific examples in the present application. The above examples are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in specific implementation modes and application scope. In summary, the content of the specification should not be understood as a limitation on the present application.

Claims

1. An electrical explosion deplugging test device, characterized in that: The device comprises a mixing system arranged on a rack, a three-phase flow generating system, an impact unblocking test cylinder, a data acquisition system and an electric explosion control cabinet; the mixing system is used for preparing and storing circulating slurry used in the test; the three-phase flow generating system is used for mixing the slurry with compressed air and forming a gas, liquid and solid three-phase fluid in a homogenizing cylinder; the impact unblocking test cylinder and the electric explosion control cabinet are used for simulating screen pipe plugging and unblocking process with the three-phase fluid; the data acquisition system is used for detecting and transmitting temperature, pressure, flow and differential pressure data of the simulated screen pipe plugging and unblocking test process; the impact unblocking test cylinder has a T-shaped structure and comprises a communicating vertical bin and a horizontal bin; a filter section is arranged at the communication position of the horizontal bin and the vertical bin, and the filter section is used for simulating screen pipe sand blocking medium; the electric explosion control cabinet is connected with an electrode arranged in the vertical bin; the data acquisition system is connected with the impact unblocking test cylinder; a first end cover is fixedly and sealingly connected to the top of the vertical bin, and the electrode is inserted into the first end cover; an extended cylinder is fixedly and sealingly connected to the end of the horizontal bin, a second end cover is fixedly arranged at the end of the extended cylinder, and a feeding port is formed in the second end cover and connected with the homogenizing cylinder; the filter section comprises a sand blocking cylinder arranged in the horizontal bin, and sand blocking medium is arranged in the sand blocking cylinder.

2. The electro-explosive de-blocking test device of claim 1, wherein: The mixing system comprises a stirring cylinder, a speed reducer motor is arranged above the stirring cylinder, and the speed reducer motor is in transmission connection with a stirring rod arranged in the stirring cylinder; the stirring cylinder is connected with an outlet on the side wall of the horizontal bin through a first pipeline, and the stirring cylinder is connected with an outlet on the side wall of the vertical bin through a second pipeline; control valves are respectively installed on the first pipeline and the second pipeline.

3. The electro-explosive de-blocking test device of claim 2, wherein: The three-phase flow generating system comprises a mud pump, an air compressor and a homogenizing cylinder which are communicated through a three-way pipe; the inlet of the mud pump is connected with the stirring cylinder through a pipeline, and the outlet of the homogenizing cylinder is communicated with the inlet of the horizontal bin through a pipeline.

4. The electro-explosive de-blocking test device of claim 1, wherein: The data acquisition system comprises an acquisition instrument, pressure sensors, temperature sensors, differential pressure sensors and flow sensors; the pressure sensors and the temperature sensors are arranged in the vertical bin and the horizontal bin; the differential pressure sensors are arranged on both sides of the sand blocking medium of the sand blocking cylinder; the flow sensor is arranged at the feeding port of the second end cover; the pressure sensors, the temperature sensors, the differential pressure sensors and the flow sensors are electrically connected with the acquisition instrument; the acquisition instrument comprises a data acquisition system and an oscilloscope.

5. The electro-explosive de-blocking test device of claim 1, wherein: An electrode sleeve which is open along an axis is threadedly connected to the first end cover; the electrode is fixed in the electrode sleeve through threads; the electrode sleeve is made of insulating material.

6. The electro-explosive de-blocking test device of claim 1, wherein: A fluid outlet is formed in the bottom of the vertical bin, and an outlet valve is fixedly installed at the fluid outlet.

7. The electro-explosive de-blocking test device of claim 1, wherein: The inner wall of the sand blocking cylinder is provided with an internal thread, one end of the sand blocking cylinder close to the electrode is fixedly provided with a mesh supporting plate, and the end of the sand blocking cylinder away from the electrode is fixedly connected with a locking nut in a threaded mode, and the sand blocking medium is arranged between the mesh supporting plate and the locking nut; the sand blocking medium comprises a plurality of filter screens arranged in the sand blocking cylinder in sequence, a filler cylinder can be arranged between two adjacent filter screens, and the filler cylinder is used for filling ceramsite; a rubber ring is arranged between the filler cylinder and the filter screen.

8. The electro-explosive de-blocking test device of claim 7, wherein: The horizontal bin end is fixedly connected with two lengthened cylinders, and the two lengthened cylinders are fixedly connected through bolts; a supporting rod is installed at the joint of the two lengthened cylinders, a sliding block is installed at the lower part of the supporting rod, the sliding block is slidingly arranged in a slide, and the slide is fixed on a rack or a table top; the lengthened cylinder can be arranged in multiple groups, and corresponding sensors are matched, and are used for collecting electric explosion shock wave parameters in the horizontal direction.

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