Water-rock interface energy regulation and control method and device based on supercritical CO2 phase change pulse
By calculating the energy distribution ratio of supercritical CO2 phase change pulses at the water-rock interface and combining the energy distribution ratio threshold and control variable method, the problem of damage to underwater organisms caused by energy overflow in the existing technology is solved, and effective control of energy overflow is achieved.
Patent Information
- Application Number
- CN202510834580.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-09-23
AI Technical Summary
The existing supercritical CO2 underwater phase change rock breaking method cannot effectively control energy overflow, resulting in the risk of damage to underwater organisms.
By calculating the energy distribution ratio of supercritical CO2 phase change pulse at the water-rock interface and combining it with the energy distribution ratio threshold, the control variable method is used to analyze the changing law of the energy distribution ratio, control the energy overflow effect, and prevent damage to underwater organisms.
The pulse energy distribution ratio is controlled during the underwater rock breaking process to prevent excessive energy overflow from causing damage to aquatic organisms.
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Figure CN120685472A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of ecological protection technology, and in particular to a method and device for regulating water-rock interface energy based on supercritical CO2 phase change pulses. Background Art
[0002] With the advancement of waterway regulation projects and the deepening of ecological awareness, supercritical CO2 underwater phase-change rock breaking (a non-explosive physical rock breaking method) has been applied to underwater reef clearing. This method uses a chemical activator to heat liquid CO2 in a sealed tube, causing it to transform into a gas. This high-pressure gas is then generated for rock fracturing. This method achieves efficient reef fragmentation without explosives, resulting in minimal environmental disturbance and no chemical residue.
[0003] However, although this method can achieve efficient reef breaking in a non-explosive environment, thereby carrying out underwater reef clearing, it cannot control the amount of energy overflow during underwater reef clearing, which puts underwater organisms (especially underwater organisms in ecologically protected waters) at risk of damage. Summary of the Invention
[0004] In response to the above-mentioned deficiencies in the prior art, the present invention provides a method and device for regulating water-rock interface energy based on supercritical CO2 phase change pulses. By calculating the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface, the control variable method is used to analyze the changing law of the energy distribution ratio. Combined with the energy distribution ratio threshold, the energy overflow effect is controlled to avoid damage to underwater organisms.
[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is: The water-rock interface energy control method based on supercritical CO2 phase change pulse includes the following steps: S1. When supercritical CO2 phase change pulse acts on the reef, the radial stress of the reef under different resistance line lengths is obtained; S2. Calculate the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface based on the radial stress of the reef at different resistance line lengths and the Rankine-Hugo-Nio condition; S3. Conduct underwater supercritical CO2 rock breaking tests to collect data on the radial stress of the reef and the peak pressure of the underwater supercritical CO2 phase change pulse; S4. Based on the energy distribution ratio of supercritical CO2 phase change pulse at the water-rock interface, and combined with the collected reef radial stress and supercritical CO2 phase change pulse peak pressure, the control variable method is used to analyze the variation law of the energy distribution ratio to achieve energy overflow control under supercritical CO2 rock breaking.
[0006] A supercritical CO2 rock breaking test device for collecting radial stress of reefs and supercritical CO2 phase change pulse peak pressure, comprising: The CO2 filling component is used to store liquid CO2 and control the filling temperature and pressure of the liquid CO2. When the filling temperature and pressure of the liquid CO2 reach the set thresholds, the liquid CO2 is in a supercritical state. Underwater fracturing assembly, used to stimulate the release of supercritical CO2 energy through blasting operation when liquid CO2 is in a supercritical state, generating supercritical CO2 phase change pulse peak pressure; The pulse monitoring component is used to collect real-time radial stress of reefs and peak pressure of supercritical CO2 phase change pulses under blasting.
[0007] The present invention has the following beneficial effects: The water-rock interface energy regulation method and device based on supercritical CO2 phase change pulse proposed in the present invention analyzes the changing law of the energy distribution ratio of supercritical CO2 phase change pulse at the water-rock interface to control the pulse energy distribution ratio when supercritical CO2 phase change pulse is used to clear reefs, thereby preventing excessive energy overflow from causing damage to aquatic organisms. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 This is a schematic diagram of the process of the water-rock interface energy control method based on supercritical CO2 phase change pulse proposed in the present invention; Figure 2 This is a schematic structural diagram of the supercritical CO2 rock breaking test device proposed in the present invention. DETAILED DESCRIPTION
[0009] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.
[0010] like Figure 1 As shown, the energy distribution control method of supercritical CO2 phase change pulse at the water-rock interface includes the following steps S1-S4: S1. When a supercritical CO2 phase change pulse acts on a reef, the radial stress of the reef is obtained at different resistance line lengths.
[0011] Specifically, step S1 includes S11-S13: S11. When the supercritical CO2 phase change pulse acts on the reef, calculate the supercritical CO2 phase change pulse peak pressure, that is:
[0012] in, Indicates the supercritical CO2 phase change pulse peak pressure, in MPa, Indicates the shear strength of the cracked pipe, in MPa. Indicates the thickness of the cracked pipe in mm. Indicates the radius of the fracture tube, in mm.
[0013] S12. Considering the transient pressurization effect of the supercritical CO2 phase change pulse peak pressure acting on the crack wall of the reef, calculate the incident stress of the reef wall, that is:
[0014] in, Represents the incident stress on the reef hole wall, in MPa. It indicates the increase factor of supercritical CO2 phase change pulse peak pressure, and its value is generally 10. Indicates the radius of the crack hole, in mm.
[0015] S13. When the peak pressure of the supercritical CO2 phase change pulse reaches the rock breaking condition, calculate the radial stress of the reef under different resistance line lengths, that is:
[0016]
[0017]
[0018]
[0019] in, Indicates the ratio of distance, It indicates the length of the reef resistance line, that is, the minimum distance from the center of the fracture hole (the central drilling hole of the fracture hole) to the free surface of the rock, in meters. represents the attenuation coefficient of the reef rock mass, represents the reef Poisson's ratio, Indicates the length of the reef resistance line The radial stress of the reef under the φ is in MPa.
[0020] S2. Based on the radial stress of the reef at different resistance line lengths and combined with the Rankine-Hugoniot condition, the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface is calculated.
[0021] Specifically, step S2 includes S21-S27: S21, when the supercritical CO2 phase change pulse is at a speed During propagation, combined with the Rankine-Hugognot condition, the water-rock interface reference system is fixed on the wavefront of the supercritical CO2 phase change pulse, and the mass conservation equations, momentum conservation equations, and energy conservation equations of the media on both sides of the wavefront under disturbance and non-disturbance are established, namely:
[0022]
[0023]
[0024]
[0025] in, represents the mass conservation equation, represents the momentum conservation equation, represents the energy conservation equation, It represents the density of the undisturbed reef medium before the wave front, in kg / m 3 , Indicates the density of the disturbed water medium behind the wave front, in kg / m 3 , represents the velocity of the undisturbed reef medium before the wave front, represents the velocity of the disturbed water medium behind the wave front, represents the unit mass internal energy of the undisturbed reef medium before the wave front, represents the unit mass internal energy of the disturbed water medium behind the wave front, represents the pressure of the undisturbed reef medium before the wave front, Indicates the pressure of the disturbed water medium behind the wave front.
[0026] S22. Perform algebraic transformation on the mass conservation equation, momentum conservation equation, and energy conservation equation to generate a simplified set of conservation equations, namely: .
[0027] S23. Use Tait equation to describe the state of water and establish the water quality state equation, namely:
[0028] in, 、 Represent different constant terms, Indicates the static water density in kg / m 3 .
[0029] In this embodiment, The value is 304.7 MPa, The value is 7.15.
[0030] S24. Combine the simplified conservation equations with the water quality state equation to solve and obtain the pulse parameters in the water, which include the density, velocity and pressure of the disturbed water medium behind the wave front.
[0031] In this embodiment, the reef medium parameters 、 as well as are known, and , so according to the reef medium parameters 、 、 and supercritical CO2 phase change pulse velocity , the pulse parameters in water can be obtained by solving 、 、 .
[0032] S25. Calculate the incident energy flux density of the supercritical CO2 phase change pulse based on the density, velocity, and pressure of the undisturbed reef medium before the wavefront, namely:
[0033] in, represents the incident energy flux density.
[0034] S26. Calculate the transmitted energy flux density of the supercritical CO2 phase change pulse based on the density, velocity, and pressure of the disturbed water medium behind the wavefront, namely:
[0035] in, Represents the transmitted energy flux density.
[0036] S27. Calculate the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface based on the incident energy flux density and the transmitted energy flux density, namely:
[0037] in, Represents the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface.
[0038] S3. Conduct underwater supercritical CO2 rock breaking tests to collect data on the radial stress of the reef and the peak pressure of the supercritical CO2 phase change pulse.
[0039] In this embodiment, a supercritical CO2 rock breaking test device can be used to conduct a supercritical CO2 rock breaking test, and the test process is as follows: Set the range of the TP-SJB-5M water pressure sensor to ±1 V / ±10 V and the maximum sampling rate to 4 MHz.
[0040] The test rock sample was the original limestone cut from the reef clearing site. The rock sample was taken from Jiangjin District, Chongqing, and belongs to the Jialingjiang Formation limestone. Its density is 2770 kg / m 3 , Poisson's ratio is 0.25, elastic modulus is 20.56 GPa, uniaxial tensile strength and compressive strength are 8.43 MPa and 78.55 MPa, respectively.
[0041] Before the test, limestone was processed into specimens measuring 500 × 500 × 500 mm. To reserve the fracture site, a fracture hole with a diameter of 100 mm and a depth of 250 mm was drilled in the center of the limestone top. After the specimen was immersed in water, a fracturing tube was placed into the fracture hole of the rock sample and then secured with a protective device. The protective device consists of a cylindrical iron barrel (2 m in diameter, 12 mm in wall thickness, and weighing 1.7 t), an iron chain, and a limiter to prevent the fracturing tube from flying out.
[0042] The experimental steps mainly include the following aspects: (1) Sample preparation: After the standardized cut limestone sample is processed through the central drilling, the sample is slowly immersed in water using a sling to ensure that the sample is in full contact with the water body and to avoid air bubble interference; (2) System connection: Connect the TP-SJB-5M water pressure sensor to the Blast-PRO pulse tester (display and export collected data), set the collection frequency (4 MHz) and related parameters, and at the same time, use a protective device to fix the fracturing tube, and check the integrity of the fracturing tube circuit and the installation of the fracturing tube; (3) Test implementation: Use the CO2 filling system to inject supercritical CO2 into the fracturing tube, and control the pressure within 10 MPa; when the fracturing tube is detonated, the strain gauge records the radial strain of the reef at different positions, and the water pressure sensor records the supercritical CO2 phase change pulse peak pressure at different positions. Among them, strain gauges are pasted on the upper surface of the test rock sample and arranged linearly along a straight line perpendicular to the free surface of the rock sample and connecting the center of the fracture hole to monitor the radial attenuation of the supercritical CO2 phase change pulse in the reef and obtain the radial strain of the reef; TP-SJB-5M water pressure sensors are arranged linearly along the water tank, at a distance of 1, 3, 5, 7, and 9 meters from the center of the fracture hole, respectively, to monitor the attenuation of the underwater supercritical CO2 phase change pulse pressure and obtain the supercritical CO2 phase change pulse peak pressure.
[0043] S4. Based on the energy distribution ratio of supercritical CO2 phase change pulse at the water-rock interface, and combined with the collected reef radial stress and supercritical CO2 phase change pulse peak pressure, the control variable method is used to analyze the variation law of the energy distribution ratio to achieve energy overflow control under supercritical CO2 rock breaking.
[0044] Specifically, step S4 includes S41-S42: S41. Based on the collected reef radial stress and supercritical CO2 phase change pulse peak pressure, calculate the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface.
[0045] S42. Using the single control variable method, by setting the energy distribution ratio threshold, taking the supercritical CO2 phase change pulse peak pressure, reef density, reef elastic modulus, reef Poisson's ratio and water density as variables, the variation law of the energy distribution ratio at the water-rock interface under supercritical CO2 phase change pulse is analyzed to achieve energy overflow control under supercritical CO2 rock breaking.
[0046] In this embodiment, the supercritical CO2 phase change pulse peak pressure, the density of the reef, the elastic modulus of the reef, the Poisson's ratio of the reef, and the density of water are respectively used as variables to analyze the influence of these variables on the energy distribution ratio. That is, according to the set energy distribution ratio threshold (such as 0.1), the construction parameters are optimized in turn to control energy overflow.
[0047] like Figure 2 As shown, a supercritical CO2 rock breaking test device is used to collect the radial stress of reefs and the supercritical CO2 phase change pulse peak pressure, including: The CO2 filling component is used to store liquid CO2 and control the filling temperature and pressure of the liquid CO2. When the filling temperature and pressure of the liquid CO2 reach the set thresholds respectively, the liquid CO2 is in a supercritical state.
[0048] Specifically, the CO2 filling assembly includes a liquid CO2 storage tank 1, a workbench 2, a temperature and pressure control center 3, a display 4, a valve 5, a booster pump 6, and a chiller 7.
[0049] Liquid CO2 gas cylinders are used to store liquid CO2.
[0050] The workbench is used to place various components, temperature and pressure control center.
[0051] The temperature and pressure control center is used to control the filling temperature and pressure of liquid CO2 in the liquid CO2 storage cylinder by controlling the booster pump and the chiller respectively.
[0052] A display is used to display the filling temperature and pressure of liquid CO2 in the liquid CO2 storage cylinder.
[0053] Valve, used to control the opening and closing of liquid CO2 storage cylinders.
[0054] Booster pump, used to pressurize liquid CO2 storage cylinders.
[0055] Chiller, used to regulate the temperature of liquid CO2 storage cylinders.
[0056] The underwater fracturing assembly is used to stimulate the release of supercritical CO2 energy through blasting operation when the liquid CO2 is in a supercritical state, thereby generating a supercritical CO2 phase change pulse peak pressure.
[0057] In this embodiment, when the temperature and pressure in the fracturing tube reach 31.1°C and 7.38 MPa, respectively, the liquid CO2 in the fracturing tube reaches a supercritical state. At this time, a detonator is used to trigger the explosion of the explosive in the fracturing tube, thereby instantly releasing the energy accumulated in the supercritical liquid CO2 to generate a supercritical CO2 phase change pulse pressure.
[0058] Specifically, the underwater fracturing assembly includes a test rock sample 8 , a fracturing tube 11 , a test water tank 10 , and a detonator 9 .
[0059] The test water tank is used as a test site for supercritical CO2 phase change pulses and is used to place test rock samples.
[0060] Test rock samples are used to generate fracturing holes through the center drilling, and the fracturing tubes are placed through the fracturing holes.
[0061] Fracturing tube, used to receive supercritical CO2.
[0062] In this embodiment, an explosive pack is placed in the fracturing tube. When an initiator such as a CHA-2000E initiator detonates the explosive pack, a supercritical CO2 phase change pulse peak pressure can be generated.
[0063] The detonator is used to detonate the supercritical CO2 in the fracturing tube and generate a supercritical CO2 phase change pulse peak pressure in the fracturing tube.
[0064] Specifically, the underwater fracturing assembly also includes a protective device, which includes a cylindrical iron barrel, an iron chain, and a limiter.
[0065] The stopper is used to fix the position of the fracture tube.
[0066] In this embodiment, the purpose of the stopper fixing the position of the fracturing tube is to prevent the fracturing tube from flying upward when the real-time explosion of supercritical CO2 phase change fracturing is achieved.
[0067] Cylindrical iron barrel, used to wrap and fix the position of test rock samples.
[0068] In this embodiment, the purpose of wrapping and fixing the test rock sample in the cylindrical iron barrel is to prevent the test rock sample from flying out after being broken.
[0069] Iron chains are used to fix the position of fracturing tubes and test rock samples.
[0070] In this embodiment, the purpose of fixing the position of the fracturing tube and the test rock sample with the iron chain is to prevent the fracturing tube from flying out.
[0071] The pulse monitoring component is used to collect real-time radial stress of reefs and peak pressure of supercritical CO2 phase change pulses under blasting.
[0072] Specifically, the pulse monitoring assembly includes a strain gauge 12 and a TP-SJB-5M water pressure sensor 13; Strain gauges are used to collect radial stress of reefs in test rock samples.
[0073] TP-SJB-5M water pressure sensor is used to collect the peak pressure of supercritical CO2 phase change pulse under blasting.
[0074] The energy distribution control method and device of supercritical CO2 phase change pulse at the water-rock interface proposed in the present invention analyzes the changing law of the energy distribution ratio of supercritical CO2 phase change pulse at the water-rock interface to control the pulse energy distribution ratio when supercritical CO2 phase change pulse is used to clear reefs, thereby preventing excessive energy overflow from causing damage to aquatic organisms.
[0075] Specific embodiments are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.
[0076] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and such variations and combinations are still within the scope of protection of the present invention.
Claims
1. A water-rock interface energy control method based on supercritical CO2 phase change pulses, characterized in that: The following steps are involved: S1. When supercritical CO2 phase change pulse acts on the reef, the radial stress of the reef under different resistance line lengths is obtained; S2. Calculate the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface based on the radial stress of the reef at different resistance line lengths and the Rankine-Hugo-Nio condition; S3. Conduct underwater supercritical CO2 rock breaking tests to collect data on the radial stress of the reef and the peak pressure of the underwater supercritical CO2 phase change pulse; S4. Based on the energy distribution ratio of supercritical CO2 phase change pulse at the water-rock interface, and combined with the collected reef radial stress and supercritical CO2 phase change pulse peak pressure, the control variable method is used to analyze the variation law of the energy distribution ratio to achieve energy overflow control under supercritical CO2 rock breaking.
2. The water-rock interface energy control method based on supercritical CO2 phase change pulse according to claim 1 is characterized in that: Step S1 specifically includes: S11. When the supercritical CO2 phase change pulse acts on the reef, calculate the supercritical CO2 phase change pulse peak pressure, that is: in, represents the supercritical CO2 phase change pulse peak pressure, Indicates the shear strength of the cracked pipe, Indicates the thickness of the fracture tube, represents the radius of the fracture tube; S12. Considering the transient pressurization effect of the supercritical CO2 phase change pulse peak pressure acting on the crack wall of the reef, calculate the incident stress of the reef wall, that is: in, represents the incident stress on the reef pore wall, Indicates the increase in the peak pressure of supercritical CO2 phase change pulse, represents the radius of the rupture hole; S13. When the peak pressure of the supercritical CO2 phase change pulse reaches the rock breaking condition, calculate the radial stress of the reef under different resistance line lengths, that is: in, Indicates the ratio of distance, Indicates the length of the reef resistance line, represents the attenuation coefficient of the reef rock mass, represents the reef Poisson's ratio, Indicates the length of the reef resistance line Radial stress of the reef under the .
3. The water-rock interface energy control method based on supercritical CO2 phase change pulse according to claim 2 is characterized in that: Step S2 specifically includes: S21, when the supercritical CO2 phase change pulse is at a speed During propagation, combined with the Rankine-Hugognot condition, the water-rock interface reference system is fixed on the wavefront of the supercritical CO2 phase change pulse, and the mass conservation equations, momentum conservation equations, and energy conservation equations of the media on both sides of the wavefront under disturbance and non-disturbance are established, namely: in, represents the mass conservation equation, represents the momentum conservation equation, represents the energy conservation equation, represents the density of the undisturbed reef medium before the wave front, represents the density of the disturbed water medium behind the wave front, represents the velocity of the undisturbed reef medium before the wave front, represents the velocity of the disturbed water medium behind the wave front, represents the unit mass internal energy of the undisturbed reef medium before the wave front, represents the unit mass internal energy of the disturbed water medium behind the wave front, represents the pressure of the undisturbed reef medium before the wave front, It represents the pressure of the disturbed water medium behind the wave front; S22. Perform algebraic transformation on the mass conservation equation, momentum conservation equation, and energy conservation equation to generate a simplified set of conservation equations, namely: ； S23. Use Tait equation to describe the state of water and establish the water quality state equation, namely: in, 、 Represent different constant terms, represents the static water density; S24. Solving the simplified conservation equations and the water quality state equation to obtain the pulse parameters in the water, which include the density, velocity, and pressure of the disturbed water medium behind the wave front; S25. Calculate the incident energy flux density of the supercritical CO2 phase change pulse based on the density, velocity, and pressure of the undisturbed reef medium before the wavefront, namely: in, represents the incident energy flux density; S26. Calculate the transmitted energy flux density of the supercritical CO2 phase change pulse based on the density, velocity, and pressure of the disturbed water medium behind the wavefront, namely: in, represents the transmitted energy flux density; S27. Calculate the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface based on the incident energy flux density and the transmitted energy flux density, namely: in, Represents the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface.
4. The water-rock interface energy control method based on supercritical CO2 phase change pulse according to claim 3 is characterized in that: Step S4 specifically includes: S41. Calculate the energy distribution ratio of the supercritical CO2 phase change pulse at the water-rock interface based on the collected reef radial stress and the supercritical CO2 phase change pulse peak pressure; S42. Using the single control variable method, by setting the energy distribution ratio threshold, taking the supercritical CO2 phase change pulse peak pressure, reef density, reef elastic modulus, reef Poisson's ratio and water density as variables, the variation law of the energy distribution ratio at the water-rock interface under supercritical CO2 phase change pulse is analyzed to achieve energy overflow control under supercritical CO2 rock breaking.
5. A supercritical CO2 rock breaking test device for collecting the reef radial stress and supercritical CO2 phase change pulse peak pressure as described in claim 1, characterized in that: include: The CO2 filling component is used to store liquid CO2 and control the filling temperature and pressure of the liquid CO2. When the filling temperature and pressure of the liquid CO2 reach the set thresholds, the liquid CO2 is in a supercritical state. Underwater fracturing assembly, used to stimulate the release of supercritical CO2 energy through blasting operation when liquid CO2 is in a supercritical state, generating supercritical CO2 phase change pulse peak pressure; The pulse monitoring component is used to collect real-time radial stress of reefs and peak pressure of supercritical CO2 phase change pulses under blasting.
6. The supercritical CO2 rock breaking test device according to claim 5, characterized in that: CO2 filling components include liquid CO2 storage tanks, workbenches, temperature and pressure control centers, displays, valves, booster pumps, and chillers; Liquid CO2 gas cylinder, used to store liquid CO2; Workbench, used to place various components, temperature and pressure control center; The temperature and pressure control center is used to control the filling temperature and pressure of liquid CO2 in the liquid CO2 storage cylinder by controlling the booster pump and chiller respectively; A display for displaying the filling temperature and pressure of liquid CO2 in the liquid CO2 storage cylinder; Valve, used to control the opening and closing of liquid CO2 gas cylinders; Booster pump, used to pressurize liquid CO2 storage cylinders; Chiller, used to regulate the temperature of liquid CO2 storage cylinders.
7. The supercritical CO2 rock breaking test device according to claim 6, characterized in that: The underwater fracturing assembly includes a test rock sample, a fracturing tube, a test water tank, and a detonator; Test water tank, used as a test site for supercritical CO2 phase change pulses and for placing test rock samples; Test rock samples are used to drill a central hole to create a fracturing hole, which is then used to place a fracturing tube; Fracturing tube, used to receive supercritical CO2; The detonator is used to detonate the supercritical CO2 in the fracturing tube and generate a supercritical CO2 phase change pulse peak pressure in the fracturing tube.
8. The supercritical CO2 rock breaking test device according to claim 7, characterized in that: The underwater fracturing assembly also includes a protective device, which includes a cylindrical iron barrel, an iron chain, and a limiter; A stopper, used to fix the position of the fracture tube; Cylindrical iron drum, used to wrap and fix the test rock sample; Iron chains are used to fix the position of fracturing tubes and test rock samples.
9. The supercritical CO2 rock breaking test device according to claim 8, characterized in that: The pulse monitoring components include strain gauges and TP-SJB-5M water pressure sensors; Strain gauges, used to collect radial stress of reefs in test rock samples; TP-SJB-5M water pressure sensor is used to collect the peak pressure of supercritical CO2 phase change pulse under blasting.