Device and method for testing large-displacement erosion resistance of petroleum tool

Abstract

The invention relates to the technical field of petroleum tool testing, in particular to a device and method for testing the large-displacement erosion resistance of a petroleum tool. The device comprises a water storage tank (1), a sand mixing tank (2), a sand settling tank (3), eight valves (4-11), a lifting device (12), a large-displacement water pump (13), a water pump baffle (14), a circulation pipeline (15), a test assembly (16), a test assembly baffle frame (17) and a temperature (18), flow (19) and pressure (20) sensing device, and operation is adjusted through a central controller (21) and a signal transceiver (22). The testing method comprises the steps of assembling the petroleum tool, preparing the erosion liquid, adjusting the output power of the pump, monitoring data in real time and cleaning after testing. The testing accuracy, the automation degree and the safety are improved, the erosion resistance of the downhole tool under the large-displacement working condition can be comprehensively evaluated, and the testing cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum industry, and in particular relates to a device and a method for testing the large-displacement erosion resistance performance of petroleum tools. Background Art

[0002] With the rapid development of the petroleum industry, the large-displacement erosion resistance test of downhole tools has gradually become a research hotspot. The existing technology mainly uses a plunger pump to pump liquid, and conducts local tests on the small test specimens of the oil tool itself without buckles. The main tests are the erosion resistance test of the inner wall and the surface of the specimen, as well as the anti-splashing ability of the surface of the specimen. Usually, the maximum displacement of the plunger pump for large-scale fracturing in the industry is 2.6-3.5 cubic meters / minute, and the operating power of a single unit is above 2000kw. A single plunger pump cannot provide a larger displacement, and the plunger pump has high energy consumption. The higher the displacement, the easier it is to damage the plunger when it is maintained in a high-frequency reciprocating pumping state. The maintenance cost of the plunger pump is high. If the displacement exceeds 3.5 cubic meters / minute, a plunger pump needs to be added. The cost of a single long-term test is high, and the economy is poor, which is not conducive to the continuous research and development of downhole tool technology. Although the existing test methods and devices can evaluate the erosion resistance of downhole tools to a certain extent, there are still some shortcomings that affect the accuracy and economy of the test.

[0003] After searching, a gas injection and production wellhead device with a publication number of CN117404041B was disclosed, and the publication date was February 23, 2024. This patent relates to a gas injection and production wellhead device for solving the problem of poor corrosion resistance of existing wellhead devices, including a casing head mechanism and a gas tree mechanism connected to the top of the casing head mechanism. The inner flow passages of the casing head mechanism and the gas tree mechanism are clad with 625 nickel-based alloy to achieve long-term corrosion resistance. The right wing pipe of the four-way adopts a 45° elbow structure. When a large displacement of fluid is injected or discharged, the slope formed at the elbow acts as a buffer, greatly reducing the erosion of the gas tree mechanism and extending the service life of the gas tree mechanism. However, in this technical solution, although 625 nickel-based alloy is used to improve corrosion resistance, its main focus is on the corrosion resistance of the wellhead device, rather than directly testing the large-volume erosion resistance of downhole tools. In addition, the testing range and accuracy of the device are limited, and it is impossible to fully evaluate the erosion performance of downhole tools under large displacement conditions.

[0004] The above problems show that the existing testing methods and devices still have certain deficiencies in terms of testing range, accuracy, energy consumption and economy, etc. Therefore, the present invention provides a downhole tool large-displacement erosion testing system and a testing method thereof, aiming to optimize the structure and process of the testing system, improve the accuracy and economy of the test, and thus meet the oil industry's demand for efficient and low-cost downhole tool testing. Summary of the invention

[0005] The present invention provides a large displacement erosion resistance test device for petroleum tools and a test method thereof, which solves the problems of limited test range, low precision, high energy consumption and poor economy in existing test devices. The present invention aims to provide a new test system with optimized structure, accurate test and high economic efficiency, so as to comprehensively evaluate the erosion resistance performance of downhole tools under large displacement conditions, provide reliable data support for the design and manufacture of downhole tools, improve the overall applicability of downhole tools, and avoid the occurrence of engineering accidents.

[0006] The first object of the present invention is to provide a large-displacement erosion resistance testing device for petroleum tools, including a water storage tank, a sand mixing tank, a sand settling tank, eight valves, a pulling device, a large-displacement water pump, a water pump baffle, a circulation pipeline, a test assembly, a test assembly baffle, and temperature, flow, and pressure sensing devices. The above devices are regulated and operated by a central controller and a signal transceiver.

[0007] The water storage tank is a cylindrical water barrel, which includes a support frame, a fence, a drain port, a tank body and a water outlet connected to a pipeline, and is used to store clean water. When the test is stopped midway or after the test is completed, the clean water can be used to replace the erosion liquid in the erosion process pipeline to avoid sand accumulation in the pipeline and quickly cool the pipeline.

[0008] The sand mixing tank comprises a tank body, a water inlet 1, a support frame, a fence, a lifting device support, a lifting device, a water inlet 2, a circulating water outlet and a flushing pipe. The flushing pipe is spiral, and there are multiple flushing ports on the pipe, which can flush the tank body in all directions. The sand mixing tank is used to store and stir the erosion medium and is the transfer center of the erosion liquid in the cyclic erosion test.

[0009] The sand settling tank is a square water tank, including stairs, fences, an upper cleaning port, a water outlet connected to a clean water tank, a water inlet, a drain port and a tank body. The sand settling tank is used to store the erosion liquid after the test, and the erosion liquid is allowed to settle in the tank body, which is convenient for replacing the erosion medium.

[0010] The eight valves are respectively installed on the erosion pipeline, and the flow direction of the erosion liquid is controlled by opening and closing the valves. The valves can be controlled by a computer to open and close a single valve or multiple valves in groups.

[0011] The lifting device includes a plug, a plug buffer spring, a buffer sleeve, a lifting rod, a positioning sleeve, a limit switch, a stroke and a lifting motor. The lifting device is installed in the sand mixing tank, and its rise and fall are controlled by a computer. The plug at the lower end of the device can block the circulating water outlet of the sand mixing tank, and block the bottom water outlet of the sand mixing tank when the test is stopped and ended, so as to prevent the erosion medium in the sand mixing tank from settling and blocking the water outlet.

[0012] The large-displacement water pump adjusts the flow of the erosion fluid by adjusting the output power of the frequency converter cabinet to achieve the actual erosion displacement underground. By connecting multiple groups of water pumps in parallel, the erosion displacement is increased to achieve the erosion displacement requirements of different tools, and fully simulate the large-displacement erosion underground.

[0013] The circulation pipeline and the test assembly are connected to the tank, the water pump and the test assembly through the pipeline, and the pipeline passage is used to realize the opening of different processes. The pipelines at the parallel test assembly are used to realize the simultaneous testing of the erosion resistance of multiple groups of petroleum tools.

[0014] The temperature, flow and pressure sensing device comprises a temperature sensor, a flow sensor and a pressure sensor, which are installed on different test assemblies to monitor the temperature, pressure and flow changes of petroleum tools at different positions during the erosion test, so as to facilitate real-time observation and recording of data and curves during the experiment.

[0015] A second object of the present invention is to provide a large displacement erosion resistance test method, comprising the following steps:

[0016] S1: Assemble the oil tools in the process pipeline and connect all sensors. Add the required clean water to the sand mixing tank and water storage tank, open valves 3, 4 and 7, lift the lifting device to make the circulation process fully open, and start the large-displacement water pump to circulate the liquid;

[0017] S2: During the circulation process, erosion medium is added to the sand mixing tank according to the test requirements to prepare the erosion liquid; after the erosion liquid is prepared, the output power of the large-displacement water pump inverter cabinet is adjusted to achieve the erosion displacement required by the test;

[0018] S3: Monitor and record the temperature, flow rate and pressure changes of the tool in real time during the erosion test through sensors;

[0019] S4: When the erosion time or erosion displacement reaches the test requirements, the experiment ends. First, open valve No. 5 and close valve No. 3; open valve No. 1 and close valve No. 7 to complete the liquid replacement cycle, reduce the output power of the frequency converter cabinet, turn off the large-displacement water pump, and then close all valves to lower the lifting device;

[0020] S5: Drain the water in the test pipe through the outlet on the test assembly, remove the oil tool for inspection and measurement, export the test data and curve, and compare them with the test requirements to see whether they meet the requirements;

[0021] S6: Drain the liquid in the water storage tank, sand settling tank and sand mixing tank through the outlet valves and clean the water tank. The erosion test is now completed.

[0022] The working principle of the large displacement erosion resistance test device is as follows: the first group of cyclic test processes is from the sand mixing tank through the No. 3 valve, temperature sensor, large displacement water pump, pressure sensor, No. 4 valve, No. 7 valve and finally back to the sand mixing tank. This group of processes is a test process, that is, the erosion liquid in the sand mixing tank passes through the pipeline, and the large displacement water pump is used to control the erosion liquid displacement to meet the erosion displacement requirements of the petroleum tool, and the sensor is used to monitor and record the changes in temperature, pressure and flow during the erosion process in real time. The second group of liquid replacement processes is that after the test is stopped or ended, the No. 5 valve is opened and the No. 3 valve is closed, so that the clean water in the water storage tank replaces the erosion liquid in the pipeline, and the pipeline can be quickly cooled; the No. 1 valve is opened and the No. 7 valve is closed, so that the erosion liquid in the circulation process flows to the sand settling tank to prevent the liquid in the sand mixing tank from escaping. The sand settling tank is connected to the top of the water storage tank by a pipeline, which can make the clean water on the upper part flow to the water storage tank after standing.

[0023] Preferably, the present invention adopts a multi-stage centrifugal pump parallel system, the multi-stage centrifugal pumps are connected in parallel, the water inlet and outlet of each pump are respectively connected to the sand mixing tank and the test assembly, and the output power of each pump is adjusted by the frequency conversion cabinet to achieve the erosion displacement requirements of different tools. According to the test requirements, the central controller sends instructions to the frequency conversion cabinet through the signal transceiver to adjust the operating state of the pump to ensure that the flow and pressure of the erosion liquid meet the test requirements. The parallel design of the multi-stage centrifugal pump enables the test system to maintain stable displacement and pressure under different conditions, thereby improving the accuracy and reliability of the test.

[0024] Preferably, the eight valves all adopt an intelligent valve control system, and the opening and closing of the valves are controlled individually or in groups by a computer. The eight intelligent valves are respectively installed at different positions of the erosion pipeline and connected to the central controller through a signal transceiver. The central controller sends instructions to each valve through the signal transceiver according to the needs of the test process to control the opening and closing of the valve. The intelligent valve control system can automatically adjust the valve state according to the needs of the test process, reduce human intervention, and improve the automation and safety of the test. The state of each valve is transmitted to the central controller in real time through a feedback signal to ensure accurate control of the valve.

[0025] Preferably, the present invention adopts an all-round flushing pipeline system. The flushing pipeline in the sand mixing tank is spiral, and multiple flushing ports are evenly distributed on the inner wall of the tank body, and the tank body is flushed in all directions by high-pressure water flow. The inlet of the flushing pipeline is connected to the clean water tank, and the outlet is connected to the drain at the bottom of the tank body. The central controller controls the valves of the water inlet and drain of the flushing pipeline through the signal transceiver according to the cleaning instruction to achieve thorough cleaning of the tank body. The use of the all-round flushing pipeline system ensures that the erosion medium in the tank body is completely removed, thereby improving the cleaning effect and reusability of the test device.

[0026] The beneficial effects of the present invention are as follows: First, the multi-stage centrifugal pump parallel system significantly improves the displacement and flexibility of the test system, avoids the problem that a single plunger pump cannot provide a larger displacement, and reduces energy consumption and maintenance costs. Under the same power conditions, the displacement can reach 50 cubic meters per minute, which fully meets the testing requirements of downhole tools under large displacement conditions. Secondly, the intelligent valve control system improves the automation and safety of the test, reduces the probability of operating errors and accidents, and ensures the safety and reliability of the test process. Finally, the all-round flushing pipeline system ensures that the erosion medium in the tank body is completely removed, improves the cleaning effect and reusability of the test device, and reduces the time and cost of cleaning and maintenance.

[0027] This test system is suitable for testing the resistance to large-volume erosion of all types of downhole tools. It can simulate the erosion of the inside and outside of downhole tools by mud, sand-carrying fluid, and high-temperature liquid under large-volume and long-term working conditions, further optimize the design and manufacture of downhole tools, improve the overall applicability of downhole tools, and avoid the occurrence of engineering accidents. This invention uses a multi-stage centrifugal pump to pump liquid, and the displacement can reach 50 cubic meters / minute under the same power of 2000kw. The process design is simplified, and the valve switch during the test is remotely controlled. The test process is safe and reliable. Under the same test conditions, the cost of a single long-term test is greatly reduced compared with the existing test technology, which is conducive to long-term continuous research and development of downhole tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the large displacement erosion resistance testing device for petroleum tools of the present invention;

[0029] Figure 2 This is a schematic diagram of a large displacement erosion resistance testing device for petroleum tools of the present invention;

[0030] Figure 3 It is a flow chart of a method for testing the large displacement erosion resistance of petroleum tools of the present invention;

[0031] Figure 4 It is a structural schematic diagram of a water storage tank of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the sand mixing tank of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the sand settling tank of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the flushing pipeline of the present invention;

[0035] Figure 8 It is a schematic structural diagram of the lifting device of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of a large-displacement water pump of the present invention;

[0037] Fig.10 It is a schematic diagram of the operating system interface of the present invention.

[0038] In the figure: 1, water storage tank; 2, sand mixing tank; 3, sand settling tank; 4, valve 1; 5, valve 2; 6, valve 3; 7, valve 4; 8, valve 5; 9, valve 6; 10, valve 7; 11, valve 8; 12, lifting device; 13, large displacement water pump; 14, water pump baffle; 15, circulation pipeline; 16, test assembly; 17, test assembly baffle; 18, temperature sensor; 19, flow sensor; 20, pressure sensor; 21, central controller; 22, signal transceiver; 23, support frame; 24, fence; 25, water outlet; 26, tank body; 27, water outlet; 28, tank body; 2 9. Water inlet 1; 30. Support frame; 31. Fence; 32. Lifting device support; 33. Lifting device; 34. Water inlet 2; 35. Circulating water outlet; 36. Flushing pipe; 37. Stairs; 38. Fence; 39. Upper cleaning port; 40. Water outlet; 41. Water inlet; 42. Drain; 43. Tank; 44. Plug; 45. Plug buffer spring; 46. Buffer sleeve; 47. Lifting rod; 48. Positioning sleeve; 49. Limit switch; 50. Stroke; 51. Lifting motor; 52. Frequency converter cabinet; 53. Flushing pipe inlet; 54. Flushing pipe outlet; 55. Operating system interface. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] The embodiment of the present invention solves the problems of limited test range, low precision, high energy consumption and poor economy in existing test devices by providing a test device and test method for large displacement erosion resistance of petroleum tools. The present invention aims to provide a new test system with optimized structure, accurate test and high economic efficiency, so as to comprehensively evaluate the erosion resistance performance of downhole tools under large displacement conditions, provide reliable data support for the design and manufacture of downhole tools, improve the overall applicability of downhole tools, and avoid the occurrence of engineering accidents.

[0041] See also Figures 1 to 10A large-displacement erosion resistance testing device for petroleum tools includes a water storage tank 1, a sand mixing tank 2, a sand settling tank 3, eight valves 4, 5, 6, 7, 8, 9, 10, 11, a pulling device 12, a large-displacement water pump 13, a water pump baffle 14, a circulation pipeline 15, a test assembly 16, a test assembly baffle 17, a temperature sensor 18, a flow sensor 19 and a pressure sensor 20. The above devices are regulated and operated by a central controller 21 and a signal transceiver 22.

[0042] The water storage tank 1 is a cylindrical water bucket, comprising a support frame 23, a fence 24, a water outlet 25, a tank body 26 and a water outlet 27 connected to a pipeline, for storing clean water. When the test is stopped midway or after the test is completed, the erosion liquid in the erosion process pipeline can be replaced with clean water to avoid sand accumulation in the pipeline and quickly cool the pipeline.

[0043] The sand mixing tank 2 comprises a tank body 28, a water inlet 129, a support frame 30, a fence 31, a lifting device support 32, a lifting device 33, a water inlet 234, a circulating water outlet 35 and a flushing pipe 36. The flushing pipe 36 is spiral, and there are multiple flushing ports on the pipe, which can perform all-round flushing of the tank body 28. The sand mixing tank 2 is used to store and stir the erosion medium, and is the transfer center of the erosion liquid in the cyclic erosion test.

[0044] The sand settling tank 3 is a square water tank, comprising stairs 37, fences 38, upper cleaning ports 39, water outlets 40 connected to the clean water tank, water inlets 41, drain ports 42 and tank bodies 43. The sand settling tank 3 is used to store the erosion liquid after the test, and the erosion liquid is allowed to settle in the tank body 43, which is convenient for replacing the erosion medium.

[0045] The eight valves 4, 5, 6, 7, 8, 9, 10, 11 are respectively installed on the erosion pipeline, and the flow direction of the erosion liquid is controlled by opening and closing the valves. The valves can be controlled by a computer to open and close a single valve or multiple valves in groups.

[0046] The lifting device 12 includes a plug 44, a plug buffer spring 45, a buffer sleeve 46, a lifting rod 47, a positioning sleeve 48, a limit switch 49, a stroke 50 and a lifting motor 51. The lifting device 12 is installed in the sand mixing tank 2, and its rise and fall are controlled by a computer. The plug 44 at the lower end of the device can block the circulating water outlet 35 of the sand mixing tank 2, and block the bottom water outlet of the sand mixing tank 2 when the test is stopped and ended, so as to prevent the erosion medium in the sand mixing tank 2 from settling and blocking the water outlet.

[0047] The large displacement water pump 13 adjusts the flow of the erosion fluid by adjusting the output power of the frequency converter cabinet 52 to achieve the actual erosion displacement underground. By connecting multiple groups of water pumps in parallel, the erosion displacement is increased to achieve the erosion displacement requirements of different tools, and the underground large displacement erosion is completely simulated.

[0048] The circulation pipeline 15 and the test assembly 16 are connected to the tank 28, the water pump 13 and the test assembly 16 through a pipeline, and the pipeline passage is used to realize the opening of different processes. The pipelines at the parallel test assembly 16 are used to realize the simultaneous testing of the erosion resistance of multiple groups of petroleum tools.

[0049] The temperature sensor 18, flow sensor 19 and pressure sensor 20 are installed on different test assemblies 16 to monitor the temperature, pressure and flow changes of oil tools at different positions during the erosion test, so as to facilitate real-time observation and recording of data and curves during the experiment.

[0050] A second object of the present invention is to provide a large displacement erosion resistance test method, comprising the following steps:

[0051] S1: Assemble the oil tools in the process pipeline and connect all sensors. Add the required clean water to the sand mixing tank 2 and the water storage tank 1, open the No. 3 valve 6, the No. 4 valve 7 and the No. 7 valve 10, and the lifting device 12 to make the circulation process fully open, and open the large-displacement water pump 13 to circulate the liquid;

[0052] S2: During the circulation process, erosion medium is added to the sand mixing tank 2 according to the test requirements to prepare an erosion liquid; after the erosion liquid is prepared, the output power of the large-displacement water pump 13 frequency conversion cabinet 52 is adjusted to achieve the erosion displacement required by the test;

[0053] S3: Monitor and record the temperature, flow rate and pressure changes of the tool in real time during the erosion test through sensors;

[0054] S4: When the erosion time or erosion displacement reaches the test requirements, the experiment is ended. First, open valve No. 5 8 and close valve No. 3 6; open valve No. 1 4 and close valve No. 7 10 to complete the liquid replacement cycle, reduce the output power of the frequency converter 52, turn off the large-displacement water pump 13, and then close all valves to lower the lifting device 12;

[0055] S5: drain the water in the test pipe through the water outlet on the test assembly 16, remove the oil tool for inspection and measurement, export the test data and curve, and compare them with the test requirements to see whether they meet the requirements;

[0056] S6: The liquid in the water storage tank 1, the sand settling tank 3 and the sand mixing tank 2 are discharged through the water outlet valves and the water tanks are cleaned. At this point, the erosion test is completed.

[0057] The working principle of the large displacement erosion resistance test device is as follows: the first group of cyclic test processes is from the sand mixing tank 2 through the No. 3 valve 6, the temperature sensor 18, the large displacement water pump 13, the pressure sensor 20, the No. 4 valve 7, and the No. 7 valve 10, and finally returns to the sand mixing tank 2. This group of processes is a test process, that is, the erosion liquid in the sand mixing tank 2 passes through the pipeline, and the large displacement water pump 13 is used to control the displacement of the erosion liquid to meet the erosion displacement requirements of the petroleum tool, and the changes in temperature, pressure and flow rate during the erosion process are monitored and recorded in real time by the sensor. The second group of liquid replacement processes is that after the test is stopped or ended, the No. 5 valve 8 is opened and the No. 3 valve 6 is closed, so that the clean water in the water storage tank 1 replaces the erosion liquid in the pipeline, and the pipeline can be quickly cooled; the No. 1 valve 4 is opened and the No. 7 valve 10 is closed, so that the erosion liquid in the circulation process flows to the sand settling tank 3 to prevent the liquid in the sand mixing tank 2 from bubbling out. The sand settling tank 3 is connected to the top of the water storage tank 1 by a pipe, so that the clean water in the upper part can flow into the water storage tank 1 after standing still.

[0058] Preferably, the present invention adopts a multi-stage centrifugal pump parallel system, the multi-stage centrifugal pumps are connected in parallel, the water inlet and outlet of each pump are respectively connected to the sand mixing tank 2 and the test assembly 16, and the output power of each pump is adjusted by the frequency conversion cabinet 52 to achieve the erosion displacement requirements of different tools. The central controller 21 sends instructions to the frequency conversion cabinet 52 through the signal transceiver 22 according to the test requirements, adjusts the operating state of the pump, and ensures that the flow and pressure of the erosion liquid meet the test requirements. The parallel design of the multi-stage centrifugal pump enables the test system to maintain a stable displacement and pressure under different conditions, thereby improving the accuracy and reliability of the test.

[0059] Preferably, the eight valves 4, 5, 6, 7, 8, 9, 10, and 11 all adopt an intelligent valve control system, and the opening and closing of the valves are controlled individually or in groups by a computer. The eight intelligent valves are respectively installed at different positions of the erosion pipeline and are connected to the central controller 21 through a signal transceiver 22. The central controller 21 sends instructions to each valve through the signal transceiver 22 according to the needs of the test process to control the opening and closing of the valve. The intelligent valve control system can automatically adjust the valve state according to the needs of the test process, reduce human intervention, and improve the automation and safety of the test. The state of each valve is transmitted to the central controller 21 in real time through a feedback signal to ensure accurate control of the valve.

[0060] Preferably, the present invention adopts an all-round flushing pipeline system, the flushing pipeline 36 in the sand mixing tank 2 is spiral, and multiple flushing ports are evenly distributed on the inner wall of the tank body 28, and the tank body 28 is flushed all-round by high-pressure water flow. The inlet of the flushing pipeline 36 is connected to the clean water tank, and the outlet is connected to the drain at the bottom of the tank body 28. The central controller 21 controls the valves of the water inlet and the drain of the flushing pipeline 36 through the signal transceiver 22 according to the cleaning instruction to achieve thorough cleaning of the tank body 28. The use of the all-round flushing pipeline system ensures that the erosion medium in the tank body is completely removed, and improves the cleaning effect and reusability of the test device.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A large displacement erosion test device for petroleum tools, characterized in that: The invention comprises a water storage tank (1), a sand mixing tank (2), a sand settling tank (3), eight valves (4, 5, 6, 7, 8, 9, 10, 11), a lifting device (12), a large-displacement water pump (13), a water pump baffle (14), a circulation pipeline (15), a test assembly (16), a test assembly baffle (17), a temperature sensor (18), a flow sensor (19) and a pressure sensor (20), wherein the above devices are regulated and operated through a central controller (21) and a signal transceiver (22).

2. A large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The water storage tank (1) is a cylindrical water barrel, comprising a support frame (23), a fence (24), a water outlet (25), a tank body (26) and a water outlet (27) connected to a pipeline, and is used to store clean water.

3. A large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The sand mixing tank (2) comprises a tank body (28), a water inlet 1 (29), a support frame (30), a fence (31), a lifting device support (32), a lifting device (33), a water inlet 2 (34), a circulating water outlet (35) and a flushing pipe (36). The flushing pipe (36) is spiral and has a plurality of flushing ports, so that the tank body (28) can be flushed in all directions.

4. A large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The sand settling tank (3) is a square water tank, comprising a staircase (37), a fence (38), an upper cleaning port (39), a water outlet (40) connected to a clean water tank, a water inlet (41), a drain outlet (42) and a tank body (43).

5. The large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The eight valves (4, 5, 6, 7, 8, 9, 10, 11) are respectively installed on the erosion pipeline, and the flow direction of the erosion liquid is controlled by opening and closing the valves. The valves can be controlled by a computer to open and close a single valve or a plurality of valves in groups.

6. A large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The lifting device (12) comprises a plug (44), a plug buffer spring (45), a buffer sleeve (46), a lifting rod (47), a positioning sleeve (48), a limit switch (49), a stroke (50) and a lifting motor (51). The lifting device (12) is installed in the sand mixing tank (2) and its rise and fall are controlled by a computer. The plug (44) at the lower end of the device can block the circulating water outlet (35) of the sand mixing tank (2).

7. A large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The large-displacement water pump (13) adjusts the flow rate of the erosion liquid by adjusting the output power of the frequency conversion cabinet (52), and increases the erosion displacement by connecting multiple groups of water pumps in parallel.

8. The large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The circulation pipeline (15) and the test assembly (16) are connected to the tank (28), the water pump (13) and the test assembly (16) through the pipeline, and the opening of different processes is realized by using the passage of the pipeline. The pipelines at the parallel test assembly (16) are used to realize the simultaneous testing of the erosion resistance of multiple groups of petroleum tools.

9. A large displacement erosion resistance testing device for petroleum tools according to claim 1, characterized in that: The temperature sensor (18), flow sensor (19) and pressure sensor (20) are installed on different test assemblies (16) to monitor the temperature, pressure and flow changes of petroleum tools at different positions during the erosion test process.

10. A large displacement erosion resistance test method, characterized in that: The following steps are involved: S1: Assemble the oil tool in the process pipeline and connect all sensors. Add the required clean water to the sand mixing tank (2) and the water storage tank (1), open valve No. 3 (6), valve No. 4 (7) and valve No. 7 (10), lift the lifting device (12) to make the circulation process fully open, and start the large-displacement water pump (13) to circulate the liquid; S2: During the circulation process, the erosion medium is added to the sand mixing tank (2) according to the test requirements to prepare the erosion liquid; after the erosion liquid is prepared, the output power of the large-displacement water pump (13) and the frequency conversion cabinet (52) is adjusted to achieve the erosion displacement required by the test; S3: Monitor and record the temperature, flow rate and pressure changes of the tool in real time during the erosion test through sensors; S4: When the erosion time or erosion displacement reaches the test requirements, the experiment is terminated. First, open valve No. 5 (8) and close valve No. 3 (6); open valve No. 1 (4), close valve No. 7 (10) to complete the liquid replacement cycle, reduce the output power of the frequency converter cabinet (52), turn off the large-displacement water pump (13), and then close all valves to lower the lifting device (12); S5: drain the water in the test pipe through the water outlet on the test assembly (16), remove the oil tool for inspection and measurement, export the test data and curve, and compare them with the test requirements to see whether they meet the requirements; S6: The liquid in the water storage tank (1), the sand settling tank (3) and the sand mixing tank (2) are discharged through the water outlet valves and the water tank is cleaned. At this point, the erosion test is completed.

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