A test bench and a test method for acid liquid jet rock breaking

Abstract

The application provides a test bench and a test method for acid liquid jet rock breaking. The test bench for acid liquid jet rock breaking comprises an acid liquid tank, a silica gel heating sheet, a supporting device, a speed control feeding unit, an acid liquid jet generator, a confining pressure loading device, a second flow meter, a second pressure gauge, a pump source system and a water tank, the acid liquid tank and the pump source system are connected with the acid liquid jet generator through pipelines, the silica gel heating sheet is sleeved outside the confining pressure loading device, the speed control feeding unit and the confining pressure loading device are both installed on the supporting device, the acid liquid jet generator is connected with the speed control feeding unit, and the pump source system is connected with the water tank.

Description

Technical Field

[0001] This invention relates to the field of acid jet rock breaking technology, and in particular to a test bench and test method for acid jet rock breaking. Background Technology

[0002] Carbonate reservoirs are important oil and gas reservoirs with wide distribution. They are generally characterized by deep burial, high ambient temperature, high pressure, and low porosity and permeability. Existing oil and gas extraction methods, such as hydraulic fracturing and supercritical carbon dioxide fracturing, often face challenges such as high drilling difficulty and slow drilling speed. Acid jetting for enhanced production was first proposed by a company for carbonate oil and gas reservoirs. This technology combines the high-speed impact of the jet with the highly dissolving effect of the acid, fully leveraging the rock-breaking and fracture-creating advantages of acid jets in carbonate rocks, significantly improving extraction speed and oil and gas production. However, research on acid jetting for rock breaking is still in the exploratory stage, lacking dedicated test rigs to address the coupled effects of acid corrosion and high-speed jet impact. Therefore, research on acid jetting for rock breaking test rigs and methods is of great significance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a test bench and test method for acid jet rock breaking, which addresses the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A test bench for acid jet rock breaking includes: an acid tank, a silicone heating plate, a support device, a speed-controlled feeding unit, an acid jet generator, a confining pressure loading device, a second flow meter, a second pressure gauge, a pump source system, and a water tank. The acid tank and the pump source system are respectively connected to the acid jet generator through pipelines. The silicone heating plate is sleeved on the outside of the confining pressure loading device. The speed-controlled feeding unit and the confining pressure loading device are both mounted on the support device. The acid jet generator is connected to the speed-controlled feeding unit, and the pump source system is connected to the water tank.

[0005] The beneficial effects of adopting the technical solution of this invention are as follows: The silicone heating pad is located outside the confining pressure loading device, providing a heat source for the test system. It can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions, simulating drilling and rock-breaking behavior in real oil and gas extraction, revealing the mechanical behavior and failure mechanism of rocks under different stress conditions, and thus conducting acid jet rock-breaking tests under real working conditions. The influence of different technical parameters on the rock-breaking effect obtained through indoor tests is more feasible and valuable for reference, helping to optimize design and adjust parameters for construction operations. By conducting macro- and micro-scale tests on the rock after acid jet damage, the mass loss of the rock, the geometry of the fracture pit, the crack propagation mode of the fractured area, and the rock's fracture mechanism under different action durations can be obtained, providing data support for in-depth exploration of the rock-breaking mechanism and mechanical properties of acid jets. By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens, simulating the stress state of rocks in various real environments, and testing the rock-breaking effect of acid jets under different confining pressures, providing guidance for improving the rock-breaking effect of this method in different environments.

[0006] Furthermore, a pressure sensor is installed on the acid jet generator, a first pressure gauge and a first flow meter are installed on the pipeline between the acid tank and the acid jet generator, a second flow meter and a second pressure gauge are installed on the pipeline between the pump source system and the acid jet generator, and the pressure sensor, the first pressure gauge, the first flow meter, the second flow meter, and the second pressure gauge are all connected to a data acquisition system.

[0007] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The data acquisition system, by collecting data from pressure sensors, flow meters, temperature sensors, and pH meters installed at different key locations on the test bench, achieves real-time dynamic monitoring of the test process, providing a data foundation for the accurate analysis of various key technical parameters. By replacing the power nozzles and mixing chamber components of different sizes in the acid jet generator, and combining this with data collection from flow meters and pressure gauges located on the flexible water pipe and acid-resistant hose, the influence of different acid concentrations on the rock-breaking effect can be tested. Flow meters are used to monitor the flow rates of acid and water in real time. Pressure gauges are used to monitor the pressures of acid and water in real time.

[0008] Furthermore, the confining pressure loading device includes: an outer sleeve, an upper end cap, a triaxial clamping unit, and a base. The outer sleeve is a cylindrical structure with an internal annular cavity. The upper end cap is installed on the top of the outer sleeve, the base is installed on the bottom of the outer sleeve, and the triaxial clamping unit is installed in the outer sleeve. A cubic rock specimen is disposed in the outer sleeve.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are: by adjusting the confining pressure loading device, different confining pressures can be set for the rock specimen to simulate the stress state of rocks in various real environments, and the rock-breaking effect of acid jet under different confining pressures can be tested, providing guidance for improving the rock-breaking effect of this method in different environments.

[0010] Furthermore, the three-axis clamping unit is powered by three independent hydraulic pumps, each of which is connected to a servo control system. Each of the three hydraulic pumps is equipped with a pressure sensor. The upper end cover is provided with a confining pressure inlet, and a temperature sensor is provided at the confining pressure inlet. The pressure sensors on the three hydraulic pumps and the temperature sensor at the confining pressure inlet are all connected to a data acquisition system.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens to simulate the stress state of rocks in various real environments. The rock-breaking effect of the acid jet under different confining pressures can be tested, providing guidance for improving the rock-breaking effect of this method in different environments. Pressure sensors are located on three independent hydraulic pumps to collect confining pressure values ​​in the X, Y, and Z axes in real time. Temperature sensors are located at the confining pressure inlet, with signal lines leading out from the upper part of the confining pressure chamber's upper cover, for real-time monitoring of the inlet temperature.

[0012] Furthermore, the speed-controlled feeding unit includes: a pair of Y-axis moving modules, an X-axis moving module, and a Z-axis moving module. The pair of Y-axis moving modules are installed on both sides of the top of the support device. The two ends of the X-axis moving module are slidably installed on the pair of Y-axis moving modules. The Z-axis moving module is slidably installed on the X-axis moving module. The acid jet generator is slidably installed on the Z-axis moving module. The pair of Y-axis moving modules, the X-axis moving module, and the Z-axis moving module are all connected to a three-axis control system.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By adjusting the moving speed of the Z-axis moving module in the speed control feed unit, the actual downhole drilling process can be simulated, and the rock-breaking effect at different drilling speeds can be tested, providing guidance for the selection of on-site construction parameters. The three-axis control system coordinates the movement of the three axes through a program to achieve precise positioning and achieves precise movement along the Z-axis direction in the drilling rock-breaking test.

[0014] Further, the acid jet generator includes: a water pipe connector, a power nozzle, a mixing chamber, a first connecting sleeve, a second connecting sleeve, a third connecting sleeve, a nozzle, and an acid-resistant hose connector. The water pipe connector is connected to the pump source system via a pipeline. The water tank contains clean water. The acid-resistant hose connector is connected to the acid tank via a pipeline. The acid tank contains acid. The power nozzle is connected to the water pipe connector. The nozzle is connected to the mixing chamber. The first connecting sleeve, the second connecting sleeve, and the third connecting sleeve are connected sequentially. The water pipe connector is installed at the free end of the first connecting sleeve. The power nozzle is located in the first connecting sleeve. The acid-resistant hose connector is installed on one side of the first connecting sleeve and communicates with the interior of the first connecting sleeve. There is a gap between the power nozzle and the first connecting sleeve. There is a gap between the power nozzle and the mixing chamber. The mixing chamber is located in the second connecting sleeve and the third connecting sleeve. The nozzle is installed at the free end of the third connecting sleeve.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By replacing the jet nozzles with different dimensional parameters in the acid jet generator and combining the data collected by the pressure sensor located at the nozzle, the influence of different jet pressures on the rock-breaking effect can be tested. This provides guidance for optimizing the structural parameters of the acid jet generator. The power nozzle is connected to the water pipe connector, converting the high-pressure water flow into a high-speed jet, generating negative pressure to draw in acid. The mixing chamber is located inside the second and third connecting sleeves, where acid and water are mixed to form an acid jet of a certain concentration. The nozzle is connected to the mixing chamber, ejecting the mixed acid in a predetermined shape and pressure. The first, second, and third connecting sleeves connect the various parts of the acid jet generator, ensuring sealing and structural stability.

[0016] Furthermore, the confining pressure loading device is connected to a waste liquid collector, which is equipped with a rock debris filter plate. The waste liquid collector is connected to a waste liquid tank via a pipeline. A valve is installed on the pipeline between the waste liquid collector and the waste liquid tank. Temperature sensors and pH meters are installed inside both the waste liquid tank and the acid tank. The temperature sensors and pH meters are connected to a control system.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The waste liquid collector is located below the support device and connected to the confining pressure chamber, used for receiving and initially collecting waste liquid. A rock cuttings filter plate is installed inside the waste liquid collector to filter rock cuttings from the waste liquid, ensuring initial purification. A valve is located at the discharge end of the waste liquid collector to control the flow of waste liquid. A waste liquid tank is connected to the waste liquid collector via a pipeline for centralized storage of waste liquid, facilitating subsequent acidification treatment. A temperature sensor and a pH meter are located inside the waste liquid tank for real-time monitoring of the temperature, concentration, etc., inside the tank. The control system is connected to the temperature sensor, pH meter, and valve, adjusting the valve opening and closing based on the monitoring data.

[0018] Furthermore, this invention also provides a test method for acid jet rock breaking, based on a test bench for acid jet rock breaking as described in any one of the above. The test method for acid jet rock breaking includes: S1, turning on the pump source system, mixing acid and water through an acid jet generator and spraying it onto a rock specimen to conduct an acid jet rock breaking test, and collecting data from various sensors in real time during the acid jet rock breaking test; S2, after the acid jet rock breaking test is completed, analyzing the rock specimen to obtain the test results; S3, based on the data obtained from each sensor and the test results of the rock specimen, obtaining the laws and mechanisms of acid jet rock breaking; S4, based on the laws and mechanisms of acid jet rock breaking, obtaining the influence laws of various technical parameters on the acid jet rock breaking effect.

[0019] The beneficial effects of adopting the technical solution of this invention are as follows: The silicone heating pad is located outside the confining pressure loading device, providing a heat source for the test system. It can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions, simulating drilling and rock-breaking behavior in real oil and gas extraction, revealing the mechanical behavior and failure mechanism of rocks under different stress conditions, and thus conducting acid jet rock-breaking tests under real working conditions. The influence of different technical parameters on the rock-breaking effect obtained through indoor tests is more feasible and valuable for reference, helping to optimize design and adjust parameters for construction operations. By conducting macro- and micro-scale tests on the rock after acid jet damage, the mass loss of the rock, the geometry of the fracture pit, the crack propagation mode of the fractured area, and the rock's fracture mechanism under different action durations can be obtained, providing data support for in-depth exploration of the rock-breaking mechanism and mechanical properties of acid jets. By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens, simulating the stress state of rocks in various real environments, and testing the rock-breaking effect of acid jets under different confining pressures, providing guidance for improving the rock-breaking effect of this method in different environments. The data obtained from each sensor are analyzed and compared with the test results to summarize the laws and mechanisms of acid jet rock breaking, evaluate the influence of parameters such as pressure, flow rate, and nozzle shape on the rock breaking effect of acid jet, and use this as the basis for optimization to continuously upgrade the system.

[0020] Further, before step S1, the steps include: S11, placing the rock specimen in the confining pressure loading device; S12, applying confining pressure to the rock specimen through the triaxial clamping unit in the confining pressure loading device; S13, heating the confining pressure loading device through the silicone heating sheet; and S14, adjusting the initial relative position between the acid jet generator and the rock specimen through the speed control feeding unit.

[0021] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The silicone heating element is located outside the confining pressure loading device, providing a heat source for the test system. It can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions, simulate the drilling and rock-breaking behavior in real oil and gas extraction, reveal the mechanical behavior and failure mechanism of rocks under different stress conditions, and then conduct acid jet rock-breaking tests under real working conditions. The influence of different technical parameters on the rock-breaking effect obtained through indoor tests is more feasible and valuable for reference, which helps in subsequent optimization design and parameter adjustment during construction operations.

[0022] Further, step S1 includes: fixing the positions of the Y-axis moving module, X-axis moving module and Z-axis moving module of the speed control feed unit, conducting a fixed-point rock breaking test of acid jet, and collecting data from each sensor in real time during the acid jet rock breaking test; or, fixing only the positions of the Y-axis moving module and X-axis moving module of the speed control feed unit, controlling the acid jet generator to advance on the Z-axis moving module at a preset speed, and conducting an acid jet drilling rock breaking test.

[0023] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By adjusting the moving speed of the Z-axis moving module in the speed-controlled feed unit, the actual downhole drilling process can be simulated, and the rock-breaking effect at different drilling speeds can be tested, providing guidance for the selection of on-site construction parameters. By fixing only the X-axis and Y-axis moving modules of the speed-controlled feed unit and setting the Z-axis to move at a certain speed in the three-axis control system, while keeping other steps unchanged, the acid jet generator can be moved at a constant speed towards the rock specimen during acid jet rock breaking, thus conducting acid jet drilling rock breaking tests.

[0024] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the test rig for acid jet rock breaking provided in an embodiment of the present invention.

[0026] Figure 2 This is a partial cross-sectional view of a test rig for acid jet rock breaking provided in an embodiment of the present invention.

[0027] Figure 3 This is a cross-sectional view of an acid jet generator provided in an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the speed control feeding unit provided in an embodiment of the present invention.

[0029] Reference numerals: 1. Acid tank; 2. Waste liquid collector; 3. Silicone heating element; 4. Support device; 5. Acid-resistant hose; 6. Speed-controlled feeding unit; 6-1. Y-axis moving module; 6-2. X-axis moving module; 6-3. Z-axis moving module; 7. Flexible water pipe; 8. Acid jet generator; 8-1. Water pipe connector; 8-2. Power nozzle; 8-3. Mixing chamber; 8-4. First connecting sleeve; 8-5. Second connecting sleeve; 8-6. Third connecting sleeve; 8-7. Nozzle; 8-8. Acid-resistant hose connector; 9. Pressure sensor; 10. Confining pressure loading device; 11. Waste liquid conveying pipeline; 12. Valve; 13. Waste liquid tank; 14. First pressure gauge; 15. Rock cuttings filter plate; 16. First flow meter; 17. Second flow meter; 18. Second pressure gauge; 19. Pump source system; 20. Water tank. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] like Figures 1 to 4 As shown, this embodiment of the invention provides a test bench for acid jet rock breaking, comprising: an acid tank 1, a silicone heating plate 3, a support device 4, a speed-controlled feeding unit 6, an acid jet generator 8, a confining pressure loading device 10, a second flow meter 17, a second pressure gauge 18, a pump source system 19, and a water tank 20. The acid tank 1 and the pump source system 19 are respectively connected to the acid jet generator 8 through pipelines. The silicone heating plate 3 is sleeved on the outside of the confining pressure loading device 10. The speed-controlled feeding unit 6 and the confining pressure loading device 10 are both mounted on the support device 4. The acid jet generator 8 is connected to the speed-controlled feeding unit 6, and the pump source system 19 is connected to the water tank 20.

[0032] The beneficial effects of adopting the technical solution of this invention are as follows: The silicone heating pad is located outside the confining pressure loading device, providing a heat source for the test system. It can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions, simulating drilling and rock-breaking behavior in real oil and gas extraction, revealing the mechanical behavior and failure mechanism of rocks under different stress conditions, and thus conducting acid jet rock-breaking tests under real working conditions. The influence of different technical parameters on the rock-breaking effect obtained through indoor tests is more feasible and valuable for reference, helping to optimize design and adjust parameters for construction operations. By conducting macro- and micro-scale tests on the rock after acid jet damage, the mass loss of the rock, the geometry of the fracture pit, the crack propagation mode of the fractured area, and the rock's fracture mechanism under different action durations can be obtained, providing data support for in-depth exploration of the rock-breaking mechanism and mechanical properties of acid jets. By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens, simulating the stress state of rocks in various real environments, and testing the rock-breaking effect of acid jets under different confining pressures, providing guidance for improving the rock-breaking effect of this method in different environments.

[0033] To address the difficulties in existing acid jet carbonate reservoir exploitation operations, and to improve the applicability and field application effectiveness of acid jet generators, it is necessary to establish an indoor testing rig and testing methods capable of simulating downhole operating conditions. The testing rig should be able to perform point-to-point rock-breaking tests under different nozzle structures, confining pressures, acid ratios, and jet velocities. It should also be able to simulate the downhole drilling process, enabling drilling and rock-breaking tests under various conditions. The testing methods must be scientific, feasible, and effective, and should be able to comprehensively evaluate the working performance of the acid jet generator, providing a basis for structural parameter design and structural optimization directions for field applications.

[0034] The present invention provides a test bench for acid jet rock breaking, which can achieve the following technical effects as a test bench for acid jet targeted rock breaking:

[0035] The test bench, through the combined operation of components such as a data acquisition system, confining pressure loading device 10, silicone heating element 3, speed control feed unit 6, acid jet generator (acid jet generator 8), waste liquid collection device, acid tank 1, water tank 20, and flow meter, can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions. It simulates the drilling and rock-breaking behavior in real oil and gas extraction, revealing the mechanical behavior and failure mechanism of rocks under different stress conditions. This allows for the conduct of acid jet rock-breaking tests under real-world conditions. The influence of different technical parameters on rock-breaking performance obtained through indoor tests is more feasible and valuable for reference, aiding in subsequent parameter adjustments for optimized design and construction operations. The data acquisition system collects data from pressure sensors, flow meters, temperature sensors, and pH meters installed at different key locations on the test bench, enabling real-time dynamic monitoring of the testing process and providing a data foundation for accurate analysis of key technical parameters.

[0036] like Figures 1 to 4 As shown, a pressure sensor 9 is installed on the acid jet generator 8, a first pressure gauge 14 and a first flow meter 16 are installed on the pipeline between the acid tank 1 and the acid jet generator 8, and a second flow meter 17 and a second pressure gauge 18 are installed on the pipeline between the pump source system 19 and the acid jet generator 8. The pressure sensor 9, the first pressure gauge 14, the first flow meter 16, the second flow meter 17, and the second pressure gauge 18 are all connected to a data acquisition system.

[0037] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The data acquisition system, by collecting data from pressure sensors, flow meters, temperature sensors, and pH meters installed at different key locations on the test bench, achieves real-time dynamic monitoring of the test process, providing a data foundation for the accurate analysis of various key technical parameters. By replacing the power nozzles and mixing chamber components of different sizes in the acid jet generator, and combining this with data collection from flow meters and pressure gauges located on the flexible water pipe and acid-resistant hose, the influence of different acid concentrations on the rock-breaking effect can be tested. Flow meters are used to monitor the flow rates of acid and water in real time. Pressure gauges are used to monitor the pressures of acid and water in real time.

[0038] like Figures 1 to 4 As shown, the confining pressure loading device 10 further includes: an outer sleeve, an upper end cover, a triaxial clamping unit, and a base. The outer sleeve is a cylindrical structure with an internal annular cavity. The upper end cover is installed on the top of the outer sleeve, the base is installed on the bottom of the outer sleeve, and the triaxial clamping unit is installed in the outer sleeve. A cubic rock specimen is disposed in the outer sleeve.

[0039] The beneficial effects of adopting the above-mentioned further technical solution are: by adjusting the confining pressure loading device, different confining pressures can be set for the rock specimen to simulate the stress state of rocks in various real environments, and the rock-breaking effect of acid jet under different confining pressures can be tested, providing guidance for improving the rock-breaking effect of this method in different environments.

[0040] Furthermore, the three-axis clamping unit is powered by three independent hydraulic pumps, each of which is connected to a servo control system. Each of the three hydraulic pumps is equipped with a pressure sensor. The upper end cover is provided with a confining pressure inlet, and a temperature sensor is provided at the confining pressure inlet. The pressure sensors on the three hydraulic pumps and the temperature sensor at the confining pressure inlet are all connected to a data acquisition system.

[0041] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens to simulate the stress state of rocks in various real environments. The rock-breaking effect of the acid jet under different confining pressures can be tested, providing guidance for improving the rock-breaking effect of this method in different environments. Pressure sensors are located on three independent hydraulic pumps to collect confining pressure values ​​in the X, Y, and Z axes in real time. Temperature sensors are located at the confining pressure inlet, with signal lines leading out from the upper part of the confining pressure chamber's upper cover, for real-time monitoring of the inlet temperature.

[0042] like Figures 1 to 4 As shown, the speed control feeding unit 6 further includes: a pair of Y-axis moving modules 6-1, an X-axis moving module 6-2, and a Z-axis moving module 6-3. The pair of Y-axis moving modules 6-1 are installed on the top two sides of the support device 4. The two ends of the X-axis moving module 6-2 are respectively slidably installed on the pair of Y-axis moving modules 6-1. The Z-axis moving module 6-3 is slidably installed on the X-axis moving module 6-2. The acid jet generator 8 is slidably installed on the Z-axis moving module 6-3. The pair of Y-axis moving modules 6-1, the X-axis moving module 6-2, and the Z-axis moving module 6-3 are all connected to a three-axis control system.

[0043] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By adjusting the moving speed of the Z-axis moving module in the speed control feed unit, the actual downhole drilling process can be simulated, and the rock-breaking effect at different drilling speeds can be tested, providing guidance for the selection of on-site construction parameters. The three-axis control system coordinates the movement of the three axes through a program to achieve precise positioning and achieves precise movement along the Z-axis direction in the drilling rock-breaking test.

[0044] like Figures 1 to 4As shown, the acid jet generator 8 further includes: a water pipe connector 8-1, a power nozzle 8-2, a mixing chamber 8-3, a first connecting sleeve 8-4, a second connecting sleeve 8-5, a third connecting sleeve 8-6, a nozzle 8-7, and an acid-resistant hose connector 8-8. The water pipe connector 8-1 is connected to the pump source system 19 via a pipeline. The water tank 20 contains clean water. The acid-resistant hose connector 8-8 is connected to the acid tank 1 via a pipeline. The acid tank 1 contains acid. The power nozzle 8-2 is connected to the water pipe connector 8-1. The nozzle 8-7 is connected to the mixing chamber 8-3. The first connecting sleeve 8-4 and the second connecting sleeve 8-5... The third connecting sleeve 8-6 is connected in sequence. The water pipe connector 8-1 is installed at the free end of the first connecting sleeve 8-4. The power nozzle 8-2 is located in the first connecting sleeve 8-4. The acid-resistant hose connector 8-8 is installed on one side of the first connecting sleeve 8-4 and communicates with the interior of the first connecting sleeve 8-4. There is a gap between the power nozzle 8-2 and the first connecting sleeve 8-4. There is a gap between the power nozzle 8-2 and the mixing chamber 8-3. The mixing chamber 8-3 is located in the second connecting sleeve 8-5 and the third connecting sleeve 8-6. The nozzle 8-7 is installed at the free end of the third connecting sleeve 8-6.

[0045] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By replacing the jet nozzles with different dimensional parameters in the acid jet generator and combining the data collected by the pressure sensor located at the nozzle, the influence of different jet pressures on the rock-breaking effect can be tested. This provides guidance for optimizing the structural parameters of the acid jet generator. The power nozzle is connected to the water pipe connector, converting the high-pressure water flow into a high-speed jet, generating negative pressure to draw in acid. The mixing chamber is located inside the second and third connecting sleeves, where acid and water are mixed to form an acid jet of a certain concentration. The nozzle is connected to the mixing chamber, ejecting the mixed acid in a predetermined shape and pressure. The first, second, and third connecting sleeves connect the various parts of the acid jet generator, ensuring sealing and structural stability.

[0046] like Figures 1 to 4 As shown, the confining pressure loading device 10 is further connected to a waste liquid collector 2, which is equipped with a rock debris filter plate 15. The waste liquid collector 2 is connected to a waste liquid tank 13 via a pipeline. A valve 12 is installed on the pipeline between the waste liquid collector 2 and the waste liquid tank 13. Temperature sensors and pH meters are installed inside both the waste liquid tank 13 and the acid tank 1. The temperature sensors and pH meters are connected to a control system.

[0047] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The waste liquid collector is located below the support device and connected to the confining pressure chamber, used for receiving and initially collecting waste liquid. A rock cuttings filter plate is installed inside the waste liquid collector to filter rock cuttings from the waste liquid, ensuring initial purification. A valve is located at the discharge end of the waste liquid collector to control the flow of waste liquid. A waste liquid tank is connected to the waste liquid collector via a pipeline for centralized storage of waste liquid, facilitating subsequent acidification treatment. A temperature sensor and a pH meter are located inside the waste liquid tank for real-time monitoring of the temperature, concentration, etc., inside the tank. The control system is connected to the temperature sensor, pH meter, and valve, adjusting the valve opening and closing based on the monitoring data.

[0048] This invention provides a test bench for acid jet rock breaking, which can be used for acid jet rock breaking at a fixed point. It consists of a data acquisition system, a confining pressure loading device 10, a silicone heating element 3, a speed control feeding unit 6, an acid jet generating device (acid jet generator 8), a waste liquid collection device, an acid tank 1, a water tank 20, flow meters (first flow meter 16 and second flow meter 17), a pressure sensor 9, and pressure gauges (first pressure gauge 14 and second pressure gauge 18).

[0049] The data acquisition system has the function of acquiring data such as flow parameters, pressure parameters, pH parameters and temperature parameters, and is connected to the signal output terminals of pressure sensor, temperature sensor, silicone heating element 3, pH meter and flow meter (first flow meter 16 and second flow meter 17).

[0050] The confining pressure loading device 10 consists of a confining pressure chamber, a pressure sensor, and a temperature sensor.

[0051] The confining pressure chamber includes an outer sleeve, an upper cover, a three-axis clamping unit, and a base. The outer sleeve is a cylindrical structure with an internal annular structure. Its upper part is connected to the upper cover via a threaded rod, and its lower part is connected to the base via a threaded rod. The outer sleeve is equipped with a three-axis clamping unit. The X-axis, Y-axis, and Z-axis are powered by three independent hydraulic pumps for confining pressure loading, and it is equipped with a high-precision servo control system. The confining pressure chamber can accommodate cubic rock specimens of up to 0.5m × 0.5m × 0.5m. In addition, smaller specimens can be placed by adding pads.

[0052] Pressure sensors are located on three independent hydraulic pumps to collect confining pressure values ​​in the X, Y, and Z axes in real time.

[0053] The temperature sensor is located at the confining pressure inlet, and the signal line is led out from the upper part of the upper cover of the confining pressure chamber to monitor the temperature at the inlet in real time.

[0054] The silicone heating element 3 is located outside the confining pressure loading device 10 and provides a heat source for the test system (a test bench for acid jet rock breaking).

[0055] The speed control feed unit 6 includes an X-axis movement module 6-2, a Y-axis movement module 6-1, a Z-axis movement module 6-3, and a three-axis control system.

[0056] The X-axis movement module 6-2 includes a linear guide, a servo motor, and a ball screw, enabling precise linear movement along the X-axis.

[0057] The Y-axis moving module 6-1 has a similar structure to the X-axis moving module 6-2. It is installed on both sides of the support device 4 and connected to the X-axis moving module 6-2 through a fixed block to achieve precise linear movement along the Y-axis.

[0058] Z-axis moving module 6-3 includes a vertical guide rail, a servo motor, and a ball screw. It is connected to X-axis moving module 6-2 via a fixed block to achieve precise linear movement along the Z-axis.

[0059] The three-axis control system coordinates the movement of the three axes through a program to achieve precise positioning and enables precise movement along the Z-axis during drilling and rock breaking tests.

[0060] The acid jet generator (acid jet generator 8) includes a water pipe connector 8-1, an acid-resistant hose connector 8-8, a power nozzle 8-2, a mixing chamber 8-3, a nozzle 8-7, and connecting sleeves (first connecting sleeve 8-4, second connecting sleeve 8-5, and third connecting sleeve 8-6). The water pipe connector 8-1 is connected to an external water tank (water tank 20) ​​via a flexible water pipe 7. The acid-resistant hose connector 8-8 is connected to the acid tank 1 via an acid-resistant hose 5. The power nozzle 8-2 is connected to the water pipe connector 8-1, converting the high-pressure water flow into a high-speed jet to generate negative pressure to draw in acid. The mixing chamber 8-3 is located inside the connecting sleeves (second connecting sleeve 8-5 and third connecting sleeve 8-6), where acid and water mix to form an acid jet of a certain concentration. The nozzle 8-7 is connected to the mixing chamber 8-3, ejecting the mixed acid liquid with a predetermined shape and pressure. The connecting sleeves (first connecting sleeve 8-4, second connecting sleeve 8-5 and third connecting sleeve 8-6) connect the various parts of the acid jet generator (acid jet generator 8) to ensure sealing and structural stability.

[0061] The waste liquid recovery device includes a waste liquid collector 2, a rock cuttings filter plate 15, a valve 12, a waste liquid tank 13, a temperature sensor, a pH meter, and a control system.

[0062] Waste liquid collector 2 is located below support device 4 and connected to confining chamber, used for receiving and initially collecting waste liquid. Rock cuttings filter plate 15 is installed inside waste liquid collector 2 to filter rock cuttings from the waste liquid, ensuring initial purification. Valve 12 is located at the discharge end of waste liquid collector 2 to control the flow of waste liquid. Waste liquid tank 13 is connected to waste liquid collector 2 via pipeline, used for centralized storage of waste liquid, facilitating subsequent acidification treatment. Temperature sensor and pH meter are located inside waste liquid tank 13 to monitor the temperature, concentration, etc., inside waste liquid tank 13 in real time. Control system is connected to the sensors (temperature sensor and pH meter) and valve 12, adjusting valve opening and closing based on monitoring data.

[0063] The acid tank 1 is connected to the acid-resistant hose connector 8-8 of the acid jet generator 8 via the acid-resistant hose 5, providing acid to the test system (a test bench for acid jet rock breaking).

[0064] Water tank 20 is connected to water pipe joint 8-1 of acid jet generator 8 via pump source system 19 and flexible water pipe 7 to provide clean water to the test system.

[0065] Flow meters (first flow meter 16 and second flow meter 17) are installed on the acid-resistant hose 5 and the flexible water pipe 7 to monitor the flow rate of acid and clean water in real time.

[0066] Pressure sensor 9 is installed on nozzle 8-7 of acid jet generator (acid jet generator 8) to accurately measure pressure fluctuations in nozzle 8-7.

[0067] Pressure gauges (first pressure gauge 14 and second pressure gauge 18) are installed on the acid-resistant hose 5 and the flexible water pipe 7 to monitor the pressure of acid and water in real time.

[0068] This invention provides a test bench for acid jet rock breaking, which can be used for targeted acid jet rock breaking. The installation and connection method is as follows: Open the inlet of the pump source system 19, connect the inlet pipe to the water tank interface (water tank 20), and tighten the nut. Open the outlet of the pump source system 19, connect the outlet pipe (flexible water pipe 7) to the water pipe connector 8-1 of the acid jet generator (acid jet generator 8), and tighten the nut. Install a second flow meter 17 and a second pressure gauge 18 on the outlet pipe (flexible water pipe 7). Open the outlet of the acid tank 1, connect the acid tank interface using an acid-resistant hose 5, and tighten the nut. Install a first flow meter 16 and a first pressure gauge 14 on the hose (acid-resistant hose 5). Open the upper cover of the confining pressure chamber, place the rock specimen used in the test into the center position of the confining pressure chamber, adjust the triaxial clamping unit, and close the upper cover of the confining pressure chamber. Install nozzle 8-7 onto the acid jet generator (acid jet generator 8), and install pressure sensor 9 above nozzle 8-7. Adjust the speed control feed unit 6 (acid jet generator 8) to a suitable position. Install waste liquid collector 2 and rock debris filter plate 15 below support device 4 and tighten nuts. Connect waste liquid collector 2, valve 12, and waste liquid tank 13 using acid-resistant pipe (waste liquid conveying pipe 11) and tighten nuts. Connect pressure sensor, temperature sensor, flow meter, pH meter, and data acquisition system using cables.

[0069] Furthermore, this invention also provides a test method for acid jet rock breaking, based on a test bench for acid jet rock breaking as described in any one of the above. The test method for acid jet rock breaking includes: S1, turning on the pump source system, mixing acid and water through an acid jet generator and spraying it onto a rock specimen to conduct an acid jet rock breaking test, and collecting data from various sensors in real time during the acid jet rock breaking test; S2, after the acid jet rock breaking test is completed, analyzing the rock specimen to obtain the test results; S3, based on the data obtained from each sensor and the test results of the rock specimen, obtaining the laws and mechanisms of acid jet rock breaking; S4, based on the laws and mechanisms of acid jet rock breaking, obtaining the influence laws of various technical parameters on the acid jet rock breaking effect.

[0070] The beneficial effects of adopting the technical solution of this invention are as follows: The silicone heating pad is located outside the confining pressure loading device, providing a heat source for the test system. It can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions, simulating drilling and rock-breaking behavior in real oil and gas extraction, revealing the mechanical behavior and failure mechanism of rocks under different stress conditions, and thus conducting acid jet rock-breaking tests under real working conditions. The influence of different technical parameters on the rock-breaking effect obtained through indoor tests is more feasible and valuable for reference, helping to optimize design and adjust parameters for construction operations. By conducting macro- and micro-scale tests on the rock after acid jet damage, the mass loss of the rock, the geometry of the fracture pit, the crack propagation mode of the fractured area, and the rock's fracture mechanism under different action durations can be obtained, providing data support for in-depth exploration of the rock-breaking mechanism and mechanical properties of acid jets. By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens, simulating the stress state of rocks in various real environments, and testing the rock-breaking effect of acid jets under different confining pressures, providing guidance for improving the rock-breaking effect of this method in different environments. The data obtained from each sensor are analyzed and compared with the test results to summarize the laws and mechanisms of acid jet rock breaking, evaluate the influence of parameters such as pressure, flow rate, and nozzle shape on the rock breaking effect of acid jet, and use this as the basis for optimization to continuously upgrade the system.

[0071] The present invention provides a test method for acid jet rock breaking, which can be used for acid jet fixed-point rock breaking tests and can achieve the following technical effects:

[0072] (1) The failure mechanism of acid jet rock breaking at a fixed point was obtained by testing.

[0073] By conducting macroscopic and microscopic tests on rocks damaged by acid jets, we can obtain the mass loss, geometry of the fracture pit, crack propagation mode of the fractured area, and fracture mechanism of the rock under different action durations, providing data support for in-depth exploration of the rock-breaking mechanism and mechanical properties of acid jets.

[0074] (2) The influence of different acid concentrations and jet pressures on the rock-breaking effect was obtained by testing.

[0075] By replacing the power nozzles and mixing chamber components of different sizes in the acid jet generator, and by collecting data from flow meters and pressure gauges located on the flexible water pipes and acid-resistant hoses, the influence of different acid concentrations on the rock-breaking effect can be tested. Similarly, by replacing the jet nozzles of different sizes and parameters in the acid jet generator, and by collecting data from pressure sensors located at the nozzles, the influence of different jet pressures on the rock-breaking effect can be tested. This provides guidance for optimizing the structural parameters of the acid jet generator.

[0076] (3) The rock-breaking effect of acid jet under different confining pressures was tested.

[0077] By adjusting the confining pressure loading device, different confining pressures can be set for the rock specimens to simulate the stress state of rocks in various real environments. The rock-breaking effect of acid jet under different confining pressures can be tested, providing guidance for improving the rock-breaking effect of this method in different environments.

[0078] (4) Test the rock-breaking effect at different drilling speeds.

[0079] By adjusting the moving speed of the Z-axis moving module in the speed control feed unit, the actual drilling process downhole can be simulated, and the rock breaking effect at different drilling speeds can be tested, providing guidance for the selection of on-site construction parameters.

[0080] Further, before step S1, the steps include: S11, placing the rock specimen in the confining pressure loading device; S12, applying confining pressure to the rock specimen through the triaxial clamping unit in the confining pressure loading device; S13, heating the confining pressure loading device through the silicone heating sheet; and S14, adjusting the initial relative position between the acid jet generator and the rock specimen through the speed control feeding unit.

[0081] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The silicone heating element is located outside the confining pressure loading device, providing a heat source for the test system. It can simulate the stress state and temperature of rocks deep underground under ground-based indoor test conditions, simulate the drilling and rock-breaking behavior in real oil and gas extraction, reveal the mechanical behavior and failure mechanism of rocks under different stress conditions, and then conduct acid jet rock-breaking tests under real working conditions. The influence of different technical parameters on the rock-breaking effect obtained through indoor tests is more feasible and valuable for reference, which helps in subsequent optimization design and parameter adjustment during construction operations.

[0082] Further, step S1 includes: fixing the positions of the Y-axis moving module, X-axis moving module and Z-axis moving module of the speed control feed unit, conducting a fixed-point rock breaking test of acid jet, and collecting data from each sensor in real time during the acid jet rock breaking test; or, fixing only the positions of the Y-axis moving module and X-axis moving module of the speed control feed unit, controlling the acid jet generator to advance on the Z-axis moving module at a preset speed, and conducting an acid jet drilling rock breaking test.

[0083] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By adjusting the moving speed of the Z-axis moving module in the speed-controlled feed unit, the actual downhole drilling process can be simulated, and the rock-breaking effect at different drilling speeds can be tested, providing guidance for the selection of on-site construction parameters. By fixing only the X-axis and Y-axis moving modules of the speed-controlled feed unit and setting the Z-axis to move at a certain speed in the three-axis control system, while keeping other steps unchanged, the acid jet generator can be moved at a constant speed towards the rock specimen during acid jet rock breaking, thus conducting acid jet drilling rock breaking tests.

[0084] A test bench comprising a data acquisition system, a confining pressure loading device 10, a silicone heating element 3, a speed-controlled feeding unit 6, an acid jet generator (acid jet generator 8), a waste liquid collection device, an acid tank 1, a water tank 20, flow meters (first flow meter 16 and second flow meter 17), a pressure sensor 9, and pressure gauges (first pressure gauge 14 and second pressure gauge 18) is provided for conducting acid jet rock-breaking tests. The test method includes the following steps:

[0085] (1) Specimen Arrangement: First, open the upper cover of the confining pressure chamber (upper cover), place a rock specimen of a certain size in the center of the confining pressure chamber, adjust the confining pressure loading device 10 to apply confining pressure to the rock specimen, and adjust the silicone heating plate 3 to heat the confining pressure loading device 10. Then, install the selected jet nozzle (nozzle 8-7) on the acid jet generator (acid jet generator 8), and use the speed control feed unit 6 to adjust the initial relative position of nozzle 8-7 and rock specimen. Finally, inject the prepared acid and water into the acid tank 1 and water tank 20 respectively, and ensure that all components and pipelines are well sealed.

[0086] (2) Debugging the data acquisition system: Install pH probes and temperature sensors in acid tank 1 and waste tank 13 to monitor the acidity and temperature of the liquid in the tanks in real time. Install pressure sensors 9 at nozzles 8-7 of the acid jet generator 8 to monitor the acid pressure at that location in real time. Install a temperature sensor at the inlet of the confining pressure chamber to monitor the acid temperature at that location in real time. Install pressure sensors on the three independent hydraulic pumps controlling the triaxial clamping unit to monitor the confining pressure values ​​of the rock specimen in three directions in real time. Debug the data acquisition system to ensure that all sensors, transmission cables, and the central control system are operating normally.

[0087] (3) Acid jet point-breaking test: Fix the position of the speed control feed unit 6, turn on the pump source system 19, set the required pressure value, and use the negative pressure generated by the power nozzle 8-2 to draw acid into the acid jet generator (acid jet generator 8), mix it with water in the mixing chamber 8-3, and spray it onto the rock specimen through the selected nozzle 8-7 to carry out the acid jet point-breaking test. The high pressure and acidity of the jet will cause chemical reaction and physical breakage on the rock surface.

[0088] (4) Data Acquisition and Processing: While turning on the pump source system 19, collect data from each sensor and monitor it continuously during the experiment to ensure safe and stable operation. After the expected sampling time is reached, turn off the data acquisition system and the pump source system 19. After taking acid-proof measures, remove the rock specimen from the confined pressure chamber, rinse it with clean water under normal pressure, and then dry it. Conduct relevant macro- and micro-scale tests such as pore measurement, mass measurement, and industrial CT. Remove the acid jet generator (acid jet generator 8) and rinse it with clean water to prevent acid residue corrosion. Remove some pipelines, rinse and store them, check the operating status of the pump source system 19, sensors, and other equipment, and perform necessary maintenance and upkeep. Analyze and compare the data obtained from each sensor with the test results, summarize the laws and mechanisms of acid jet rock breaking, evaluate the influence of parameters such as pressure, flow rate, and nozzle shape on the acid jet rock breaking effect, and use this as a basis for optimization to continuously upgrade the system.

[0089] In addition, if only the X-axis and Y-axis moving modules of the speed control feed unit 6 are fixed in step (3), and the Z-axis direction is set to move forward at a certain speed in the three-axis control system, while other steps remain unchanged, the acid jet generator can be made to move at a constant speed towards the rock specimen below during the acid jet rock breaking process, and the acid jet drilling rock breaking test can be carried out.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test rig for acid jet rock breaking, characterized in that, include: The system comprises an acid tank (1), a silicone heating plate (3), a support device (4), a speed-controlled feeding unit (6), an acid jet generator (8), a confining pressure loading device (10), a second flow meter (17), a second pressure gauge (18), a pump source system (19), and a water tank (20). The acid tank (1) and the pump source system (19) are respectively connected to the acid jet generator (8) through pipelines. The silicone heating plate (3) is sleeved on the outside of the confining pressure loading device (10). The speed-controlled feeding unit (6) and the confining pressure loading device (10) are both installed on the support device (4). The acid jet generator (8) is connected to the speed-controlled feeding unit (6), and the pump source system (19) is connected to the water tank (20).

2. The test rig for acid jet rock breaking according to claim 1, characterized in that, A pressure sensor (9) is installed on the acid jet generator (8). A first pressure gauge (14) and a first flow meter (16) are installed on the pipeline between the acid tank (1) and the acid jet generator (8). A second flow meter (17) and a second pressure gauge (18) are installed on the pipeline between the pump source system (19) and the acid jet generator (8). The pressure sensor (9), the first pressure gauge (14), the first flow meter (16), the second flow meter (17), and the second pressure gauge (18) are all connected to a data acquisition system.

3. The test rig for acid jet rock breaking according to claim 1, characterized in that, The confining pressure loading device (10) includes: an outer sleeve, an upper end cover, a triaxial clamping unit and a base. The outer sleeve is a cylindrical structure with an internal annular structure. The upper end cover is installed on the top of the outer sleeve, the base is installed on the bottom of the outer sleeve, and the triaxial clamping unit is installed in the outer sleeve. A cubic rock specimen is provided in the outer sleeve.

4. The test rig for acid jet rock breaking according to claim 3, characterized in that, The three-axis clamping unit is powered by three independent hydraulic pumps, each of which is connected to a servo control system. Each of the three hydraulic pumps is equipped with a pressure sensor. The upper end cover is provided with a confining pressure inlet, and a temperature sensor is provided at the confining pressure inlet. The pressure sensors on the three hydraulic pumps and the temperature sensor at the confining pressure inlet are all connected to a data acquisition system.

5. A test bench for acid jet rock breaking according to claim 1, characterized in that, The speed control feeding unit (6) includes: a pair of Y-axis moving modules (6-1), an X-axis moving module (6-2), and a Z-axis moving module (6-3). The pair of Y-axis moving modules (6-1) are installed on the top two sides of the support device (4). The two ends of the X-axis moving module (6-2) are slidably installed on the pair of Y-axis moving modules (6-1). The Z-axis moving module (6-3) is slidably installed on the X-axis moving module (6-2). The acid jet generator (8) is slidably installed on the Z-axis moving module (6-3). The pair of Y-axis moving modules (6-1), the X-axis moving module (6-2), and the Z-axis moving module (6-3) are all connected to a three-axis control system.

6. The test rig for acid jet rock breaking according to claim 1, characterized in that, The acid jet generator (8) includes: a water pipe connector (8-1), a power nozzle (8-2), a mixing chamber (8-3), a first connecting sleeve (8-4), a second connecting sleeve (8-5), a third connecting sleeve (8-6), a nozzle (8-7), and an acid-resistant hose connector (8-8). The water pipe connector (8-1) is connected to the pump source system (19) via a pipeline. The water tank (20) contains clean water. The acid-resistant hose connector (8-8) is connected to the acid tank (1) via a pipeline. The acid tank (1) contains acid. The power nozzle (8-2) is connected to the water pipe connector (8-1). The nozzle (8-7) is connected to the mixing chamber (8-3). The first connecting sleeve (8-4) and the second connecting sleeve (8-5) are connected to the water pipe connector (8-1). The third connecting sleeve (8-6) is connected in sequence. The water pipe connector (8-1) is installed at the free end of the first connecting sleeve (8-4). The power nozzle (8-2) is located in the first connecting sleeve (8-4). The acid-resistant hose connector (8-8) is installed on one side of the first connecting sleeve (8-4) and communicates with the interior of the first connecting sleeve (8-4). There is a gap between the power nozzle (8-2) and the first connecting sleeve (8-4). There is a gap between the power nozzle (8-2) and the mixing chamber (8-3). The mixing chamber (8-3) is located in the second connecting sleeve (8-5) and the third connecting sleeve (8-6). The nozzle (8-7) is installed at the free end of the third connecting sleeve (8-6).

7. A test rig for acid jet rock breaking according to claim 1, characterized in that, The confining pressure loading device (10) is connected to a waste liquid collector (2), which is equipped with a rock debris filter plate (15). The waste liquid collector (2) is connected to a waste liquid tank (13) through a pipeline. A valve (12) is installed on the pipeline between the waste liquid collector (2) and the waste liquid tank (13). Temperature sensors and pH meters are installed inside both the waste liquid tank (13) and the acid tank (1). The temperature sensors and pH meters are connected to a control system.

8. A test method for acid jet rock breaking, characterized in that, Based on any one of claims 1 to 7, a test rig for acid jet rock breaking is provided, and a test method for acid jet rock breaking includes: S1. Turn on the pump source system, mix the acid and water through the acid jet generator and spray it onto the rock specimen to carry out the acid jet rock breaking test, and collect the data obtained by each sensor in the acid jet rock breaking test in real time. S2. After the acid jet rock breaking test is completed, the rock specimen is analyzed to obtain the test results of the rock specimen; S3. Based on the data obtained from each sensor and the test results of the rock specimen, the laws and mechanisms of acid jet rock breaking are obtained; S4. Based on the laws and mechanisms of acid jet rock breaking, the influence of various technical parameters on the rock breaking effect of acid jet was obtained.

9. A test method for acid jet rock breaking according to claim 8, Its features are, Before step S1, the following are included: S11. Place the rock specimen in the confining pressure loading device; S12. Apply confining pressure to the rock specimen through the triaxial clamping unit in the confining pressure loading device; S13. The confining pressure loading device is heated by a silicone heating pad; S14. Adjust the initial relative position between the acid jet generator and the rock specimen through the speed control feed unit.

10. A test method for acid jet rock breaking according to claim 8, characterized in that, Step S1 includes: fixing the positions of the Y-axis moving module, X-axis moving module and Z-axis moving module of the speed control feeding unit, conducting a fixed-point rock breaking test of acid jet, and collecting data from each sensor in the acid jet rock breaking test in real time; Alternatively, the positions of the Y-axis and X-axis moving modules of the fixed speed control feed unit can be fixed, and the acid jet generator can be controlled to move forward at a preset speed on the Z-axis moving module to conduct an acid jet drilling and rock breaking test.

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