CN111058818A - Pulse wave reinforced hydraulic fracturing evaluation experimental device and method - Google Patents
Pulse wave reinforced hydraulic fracturing evaluation experimental device and method Download PDFInfo
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Abstract
The invention discloses a pulse wave reinforced hydraulic fracturing evaluation experimental device and method, relates to the technical field of hydraulic fracturing, and solves the problems that the damage degree of a shock wave to shale is not clear, the fracturing mechanism is not clear, and the shock wave reinforced hydraulic fracturing evaluation experimental device cannot be applied to the reconstruction of a compact reservoir, and the technical scheme has the key points that: the triaxial pressure experimental device comprises a sleeve, a shock wave generator and a power supply control cabinet; a rock sample is arranged in the sleeve, and the shock wave generator is arranged in the rock sample; the top end of the sleeve is provided with an upper base, and the bottom end of the sleeve is provided with a lower base; the fluid conveying control device comprises a fracturing fluid tank, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline; the experimental parameter monitoring device comprises a data acquisition system, a flowmeter and a pressure sensor; the flowmeter is arranged on the third pipeline; the pressure sensor is installed on the fourth pipeline, and has the effect of being capable of simultaneously completing experiments such as rock fracturing caused by shock waves, rock fracturing caused by different shock wave reinforced hydraulic fracturing modes, permeability testing before and after fracturing and the like.
Description
Technical Field
The invention relates to the technical field of hydraulic fracturing, in particular to a pulse wave reinforced hydraulic fracturing evaluation experimental device and method.
Background
With the social development of energy requirements and the development of oil and gas resource exploration and development technologies, tight reservoirs such as shale gas, coal bed gas and tight oil and gas gradually become the main force for increasing the storage and production of oil and gas resources in various countries, and in order to realize the efficient development of the tight reservoirs, the productivity of the reservoirs is generally required to be improved through reservoir transformation measures.
At present, the common reservoir stratum reconstruction measures include a hydraulic fracturing technology, an acid fracturing technology, a water injection development technology, a high-energy gas fracturing technology, a pulse permeability-increasing reservoir stratum technology and the like, wherein the hydraulic fracturing method is the most main mode for permeability-increasing reconstruction of a compact reservoir stratum. The conventional hydraulic fracturing is to inject fracturing fluid into a well at a discharge capacity exceeding the absorption capacity of a stratum by utilizing a ground high-pressure pump set, build high pressure near the bottom of the well, and fracture the stratum after the pressure exceeds the rock ultimate strength so as to form a crack, thereby improving the seepage condition of a reservoir stratum. According to the change situation of the pump pressure during the site construction, the conventional hydraulic fracturing is to improve the seepage capability of a reservoir by fracturing the reservoir by hydrostatic pressure, and in order to improve the fracturing effect, a large-discharge-amount pressure-holding mode is required, so that the conventional hydraulic fracturing has the defects of large pump injection amount and low energy utilization rate; when the maximum and minimum stress difference in the direction perpendicular to the borehole is large, tree-shaped cracks or even single cracks are generally formed in hydraulic fracturing, and a good volume fracturing effect cannot be achieved.
The current research on the shock wave reinforced hydraulic fracturing technology and the field application thereof still have the following problems, which limit the application of the technology in the tight reservoir reconstruction:
1. the damage degree of the shock wave to the shale strength characteristic is not clear, and if the influence of the shock wave on physical and mechanical parameters of the shale is not considered, the mechanism that the shale crack initiation pressure and the expansion resistance are low and the crack net complexity is high when the hydraulic fracturing is strengthened by the shock wave cannot be disclosed;
2. the mechanism of the shock wave reinforced hydraulic fracturing fractured shale is unknown, and a guiding theory and a method for determining the quantitative relation between parameters such as shock wave amplitude, frequency, times, pumping pressure and the like and the fracture initiation pressure and the expansion range of the shale are lacked;
3. the action mechanism and the permeation enhancing effect of the three shock wave strengthening modes are different to a certain extent, but the comparison research of the three process methods is rarely reported at present;
the basis of the research of the mechanism problems is to carry out necessary shock wave reinforced hydraulic fracturing experiments, and a shock wave reinforced hydraulic fracturing experiment system which can simultaneously complete experimental contents such as shock wave fractured rocks, fractured rocks caused by different shock wave reinforced hydraulic fracturing modes, permeability tests before and after fracturing and the like is lacked at home and abroad at present. Therefore, how to design an experimental device and method for evaluating the pulse wave reinforced hydraulic fracturing is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a pulse wave reinforced hydraulic fracturing evaluation experimental device which can simultaneously complete experimental contents of impact wave fractured rocks, fractured rocks in different impact wave reinforced hydraulic fracturing modes, permeability tests before and after fracturing and the like, provides a foundation for realizing high-efficiency development of a compact reservoir and improving the reservoir capacity through reservoir transformation measures, and has wide application prospects in the field of compact reservoir fracturing transformation.
The technical purpose of the invention is realized by the following technical scheme: a pulse wave reinforced hydraulic fracturing evaluation experimental device comprises a triaxial pressure experimental device, a fluid conveying control device and an experimental parameter monitoring device; wherein,
the triaxial pressure experimental device comprises a sleeve pipe, a shock wave generator and a power supply control cabinet, wherein the sleeve pipe is arranged at an opening at the top end of the sleeve pipe, the power supply control cabinet is electrically connected with the shock wave generator, and the top end of the sleeve pipe is hermetically connected with a cable sealer; a rock sample is coaxially arranged in the sleeve, and the shock wave generator is arranged in the rock sample; the top end of the sleeve is provided with an upper base which is abutted against the top surface of the rock sample, and the bottom end of the sleeve is provided with a lower base which is abutted against the bottom surface of the rock sample;
the fluid conveying control device comprises a fracturing fluid tank, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline; two ends of the first pipeline are respectively communicated with the fracturing fluid box and the top end of the sleeve, a fracturing pump is arranged at the inlet end of the first pipeline close to the fracturing fluid box, and a first regulating valve is arranged at the outlet end of the first pipeline close to the sleeve; two ends of the second pipeline are respectively communicated with the fracturing fluid tank and the inner side wall of the sleeve, a confining pressure pump is arranged at the inlet end, close to the fracturing fluid tank, of the second pipeline, and a second regulating valve is arranged at the outlet end, close to the sleeve, of the second pipeline; two ends of the third pipeline are respectively communicated with the fracturing fluid tank and the bottom end of the sleeve, and the third pipeline is provided with a third regulating valve; two ends of the fourth pipeline are respectively communicated with the fracturing fluid tank and the center of the bottom end of the sleeve, and the fourth pipeline is provided with a fourth regulating valve;
the experimental parameter monitoring device comprises a data acquisition system, a flowmeter and a pressure sensor, wherein the flowmeter and the pressure sensor are connected with the data acquisition system; the flowmeter is arranged on the third pipeline and is positioned between the third regulating valve and the sleeve; and the pressure sensor is arranged on the fourth pipeline and is positioned between the fourth regulating valve and the sleeve.
By adopting the technical scheme, the confining pressure pump acts on the sleeve and can transmit the confining pressure of the horizontal stress of the simulated formation to the rock sample; the upper base and the lower base are respectively abutted against two ends of the sleeve and can transmit axial pressure simulating the pressure of the upper and lower coating layers to the rock sample, so that the rock sample is positioned under the condition of a triaxial pressure experiment; when the rock is fractured by the shock wave, the power supply control cabinet controls the shock wave generator to start, the shock wave generator generates instantaneous high-pressure shock waves, and the rock sample is fractured under the action of the shock waves; when the rock is fractured in a shock wave reinforced hydraulic fracturing mode, fracturing fluid is pumped out of a fracturing fluid tank under the action of a fracturing pump, enters an experimental device through a first regulating valve, flows out of the experimental device through a fourth regulating valve, enters the fracturing fluid tank, forms fluid circulation, regulates flow and pressure through the first regulating valve, converts signals into electric signals to be transmitted to an external data acquisition system when a pressure sensor receives signals such as pressure, and the like, so that an operator can change experimental parameters according to the acquired data to meet the requirements required by experiments; when permeability tests are carried out before and after the rock sample is fractured, the first regulating valve is closed, the third regulating valve is opened, so that an experimental medium is pressed into the rock sample from the lower part of the casing pipe to start displacement, the acquired data are transmitted to the data acquisition system by the flowmeter and the pressure sensor, and the permeability of the rock sample is measured after the data are processed.
The invention is further configured to: and protective cushion layers are arranged between the top end of the sleeve and the upper base and between the bottom end of the sleeve and the lower base.
Through adopting above-mentioned technical scheme, utilize the protection bed course, be convenient for fix and protect the rock specimen, prevent that the condition that influences the experimental effect because of abnormal damage when the rock specimen receives pressure from taking place.
The invention is further configured to: the protective cushion layer is an epoxy resin adhesive layer.
By adopting the technical scheme, the fixing performance of the upper base, the lower base and the rock sample is convenient to enhance.
The invention is further configured to: and the fourth pipeline is provided with a filter, and the filter is positioned between the fourth regulating valve and the sleeve.
Through adopting above-mentioned technical scheme, be convenient for filter the fracturing detritus in the circulation flow back fracturing fluid tank.
The invention is further configured to: the maximum load axial pressure of the triaxial pressure experimental device is 2800 and 3200KN, and the maximum confining pressure is 35-45 MPa.
Through adopting above-mentioned technical scheme, be convenient for strengthen experimental apparatus's experimental range.
The invention is further configured to: the diameter of the rock sample is 0-50mm, and the length is 0-100 mm.
By adopting the technical scheme, the experimental device is convenient to operate.
The invention also aims to provide a pulse wave reinforced hydraulic fracturing evaluation experiment method, which can simultaneously complete the experiment contents of impact wave fractured rocks, different impact wave reinforced hydraulic fracturing modes fractured rocks, permeability tests before and after fracturing and the like, provides a foundation for realizing the high-efficiency development of a compact reservoir and improving the reservoir capacity through reservoir transformation measures, and has wide application prospect in the field of compact reservoir fracturing transformation.
The technical purpose of the invention is realized by the following technical scheme: a pulse wave reinforced hydraulic fracturing evaluation experiment method comprises the following steps:
s1: storing the prepared fracturing fluid meeting the experimental requirements in a fracturing fluid tank for later use, and selecting and preparing a test rock sample meeting the experimental requirements for later use;
s2: determining the permeability Kb of the rock sample before fracturing; loading a test rock sample before fracturing into a casing, selecting formation water or standard saline water as a flowing experiment medium, closing the first regulating valve and opening the third regulating valve to press the experiment medium into the rock sample from the lower part of the casing to start displacing; controlling the flow and pressure of the fluid through a third regulating valve, measuring the permeability of the rock sample when the flow and the pressure difference tend to be stable, recording the flow and the pressure difference of the injected fluid, programming a computer software program according to a calculation formula, calculating the permeability of the rock sample, and mastering the change condition of the permeability in real time;
s3, re-placing the test rock sample into the sleeve, and adjusting the parameters of the triaxial pressure experimental device according to the experimental requirements;
s4, pressurizing by a fracturing pump to enable fracturing fluid to pass through a first regulating valve to reach a shock wave generator, controlling the shock wave generator by a power supply control cabinet, fracturing rock samples by the generated shock wave, enabling the fracturing fluid to flow out of the center of the lower end of the sleeve, passing through a fourth regulating valve and then flowing to a fracturing fluid box, and recording various data in the experimental process after fracturing is finished;
s5, measuring the permeability Ka of the fractured rock sample: after the rock sample is fractured by the shock waves, the first regulating valve and the fourth regulating valve are closed, and the flow and the pressure of the fluid are controlled by the third regulating valve; when the fracturing fluid flows out of the center of the lower end of the sleeve, recording the flow, total accumulation and pressure difference of the fracturing fluid and the rock-carrying fluid, and repeating the S2 method to determine the permeability of the experimental medium of the rock sample under the action of the fracturing fluid and the fracturing fluid;
s6, after the fracturing experiment is finished, taking out the rock sample, closing the running fracturing pump and confining pressure pump, closing the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve, and reasonably treating the fracturing waste liquid.
In conclusion, the invention has the following beneficial effects: the confining pressure pump, the upper base and the lower base are utilized to enable the rock sample to be positioned under the triaxial pressure experiment condition, so that the accuracy of the experiment evaluation result is enhanced; the experimental contents of rock fracturing by shock waves, rock fracturing by different shock wave reinforced hydraulic fracturing modes, permeability testing before and after fracturing and the like can be simultaneously completed, and a foundation is provided for realizing high-efficiency development of a compact reservoir and improving the reservoir capacity through reservoir transformation measures.
Drawings
Fig. 1 is a schematic view of the overall structure in the embodiment of the present invention.
In the figure: 1. a sleeve; 11. a cable sealer; 12. an upper base; 13. a lower base; 14. a protective cushion layer; 15. sampling rock; 16. a shock wave generator; 17. a power supply control cabinet; 2. a fracturing fluid tank; 21. a first pipeline; 211. a fracturing pump; 212. a first regulating valve; 22. a second pipeline; 221. a confining pressure pump; 222. a second regulating valve; 23. a third pipeline; 231. a third regulating valve; 24. a fourth pipeline; 241. a fourth regulating valve; 242. a filter; 3. a data acquisition system; 31. a pressure sensor; 32. a flow meter.
Detailed Description
The present invention is described in further detail below with reference to fig. 1.
Example 1: a pulse wave reinforced hydraulic fracturing evaluation experimental device is shown in figure 1 and comprises a triaxial pressure experimental device, a fluid conveying control device and an experimental parameter monitoring device. The triaxial pressure experimental device comprises a sleeve 1 with an opening at the top end, a shock wave generator 16 and a power supply control cabinet 17 electrically connected with the shock wave generator 16, wherein the top end of the sleeve 1 is hermetically connected with a cable sealer 11. A rock sample 15 is coaxially arranged in the sleeve 1, and a shock wave generator 16 is arranged in the rock sample 15. The top end of the sleeve 1 is provided with an upper base 12 which is abutted against the top surface of the rock sample 15, and the bottom end of the sleeve 1 is provided with a lower base 13 which is abutted against the bottom surface of the rock sample 15.
The fluid delivery control device comprises a fracturing fluid tank 2, a first pipeline 21, a second pipeline 22, a third pipeline 23 and a fourth pipeline 24. The both ends of first pipeline 21 communicate with fracturing fluid case 2 and sleeve pipe 1 top respectively, and first pipeline 21 is close to the entrance point of fracturing fluid case 2 and is equipped with fracturing pump 211, and first pipeline 21 is close to the exit end of sleeve pipe 1 and is equipped with first governing valve 212. Two ends of the second pipeline 22 are respectively communicated with the fracturing fluid tank 2 and the inner side wall of the casing 1, a confining pressure pump 221 is arranged at the inlet end, close to the fracturing fluid tank 2, of the second pipeline 22, and a second regulating valve 222 is arranged at the outlet end, close to the casing 1, of the second pipeline 22. The both ends of third pipeline 23 communicate with fracturing fluid case 2 and sleeve pipe 1 bottom respectively, and third pipeline 23 is equipped with third governing valve 231. The two ends of the fourth pipeline 24 are respectively communicated with the centers of the bottom ends of the fracturing fluid tank 2 and the sleeve 1, and the fourth pipeline 24 is provided with a fourth regulating valve 241.
The experimental parameter monitoring device comprises a data acquisition system 3, a flow meter 32 and a pressure sensor 31, wherein the flow meter 32 and the pressure sensor 31 are connected with the data acquisition system 3. The flow meter 32 is mounted on the third pipe 23 between the third regulating valve 231 and the casing 1. The pressure sensor 31 is installed on the fourth piping 24 between the fourth regulating valve 241 and the casing 1. In this embodiment, the data acquisition system 3 is a computer.
The confining pressure pump 221 acts on the casing 1 and can transmit confining pressure B simulating horizontal stress of the stratum to the rock sample 15. The upper base 12 and the lower base 13 are respectively abutted against two ends of the sleeve 1, and can transmit axial pressure A for simulating the pressure of the upper cladding layer and the lower cladding layer to the rock sample 15, so that the rock sample 15 is positioned under the condition of a triaxial pressure experiment. When the rock is fractured by the shock wave, the power supply control cabinet 17 controls the shock wave generator 16 to start, the shock wave generator 16 generates instantaneous high-voltage shock waves, and the rock sample 15 is fractured under the action of the shock waves. When the hydraulic fracturing mode is strengthened at the shock wave and is sent and split the rock, under fracturing pump 211's effect, fracturing fluid is taken out from fracturing fluid tank 2, get into experimental apparatus through first governing valve 212, through fourth governing valve 241 outflow experimental apparatus again, get into fracturing fluid tank 2, the liquid stream circulation has been formed, adjust flow and governing valve regulated pressure through first governing valve 212, and simultaneously, when pressure sensor 31 received signals such as pressure, convert the signal into the signal of telecommunication and pass for outside data acquisition system 3, the staff is according to the data of gathering, can change the experiment parameter, in order to satisfy the required requirement of experiment. When permeability is tested before and after the rock sample 15 is fractured, the first regulating valve 212 is closed, the third regulating valve 231 is opened, the experimental medium is pressed into the rock sample 15 from the lower part of the casing 1 to start displacement, the flowmeter 32 and the pressure sensor 31 transmit the acquired data to the data acquisition system 3, and the permeability of the rock sample 15 is measured after processing. Under the coordination of the first regulating valve 212, the fourth regulating valve 241, the fracturing fluid tank 2, the fracturing pump 211, the shock wave generator 16, the pressure sensor 31 and the data acquisition system 3, the fracturing fluids with different pressures, different discharge capacities, different frequencies and different performances can be generated, and various fracturing conditions are met.
Protective cushion layers 14 are arranged between the top end of the sleeve 1 and the upper base 12 and between the bottom end of the sleeve 1 and the lower base 13. Utilize protection bed course 14, be convenient for fix and protect rock specimen 15, prevent that the condition that influences the experimental effect takes place because of abnormal damage when rock specimen 15 receives the pressure. In this embodiment, the protective pad layer 14 is an epoxy resin adhesive layer.
The fourth pipeline 24 is provided with a filter 242, and the filter 242 is located between the fourth regulating valve 241 and the casing 1, so as to filter the fracturing debris which circulates back to the fracturing fluid tank 2.
The maximum load axial pressure of the triaxial pressure experimental device is 2800 and 3200KN, and the maximum confining pressure is 35-45 MPa. In this embodiment, the maximum load axial pressure of the triaxial pressure testing apparatus is 3000KN, and the maximum confining pressure is 40 MPa.
The diameter of the rock sample 15 is 0-50mm, and the length is 0-100mm, so that the experimental device is convenient to operate.
Example 2: a pulse wave reinforced hydraulic fracturing evaluation experiment method is shown in figure 1 and comprises the following steps:
step one, the prepared fracturing fluid meeting the experimental requirements is stored in a fracturing fluid tank 2 for later use, and a test rock sample 15 meeting the experimental requirements is selected and prepared for later use.
And step two, measuring the permeability Kb of the rock sample 15 before fracturing. The test rock sample 15 before fracturing is loaded into the casing 1, formation water or standard brine is selected as a flowing experiment medium, the first regulating valve 212 is closed, and the third regulating valve 231 is opened, so that the experiment medium is pressed into the rock sample 15 from the lower part of the casing 1 to start displacing. The third regulating valve 231 is used for controlling the flow and the pressure of the fluid, when the flow and the pressure difference tend to be stable, the permeability of the rock sample 15 is measured, the flow and the pressure difference of the injected fluid are recorded, a computer software program is programmed according to a calculation formula, the permeability of the rock sample 15 is calculated, and the change condition of the permeability is mastered in real time.
And step three, the test rock sample 15 is re-installed in the casing 1, and parameters of the triaxial pressure experiment device are adjusted according to experiment requirements.
And step four, pressurizing by using a fracturing pump 211 to enable fracturing fluid to pass through a first regulating valve 212 to reach a shock wave generator 16, controlling the shock wave generator 16 by using a power supply control cabinet 17, fracturing the rock sample 15 by using the generated shock wave, enabling the fracturing fluid to flow out from the center of the lower end of the sleeve 1, flowing to a fracturing fluid tank 2 after passing through a fourth regulating valve 241, and recording various data in the experimental process after fracturing is finished.
Step five, determining the permeability Ka of the fractured rock sample 15: after the rock sample 15 is fractured by the shock wave, the first regulating valve 212 and the fourth regulating valve 241 are closed, and the flow rate and pressure of the fluid are controlled by the third regulating valve 231. And when the fracturing fluid flows out from the center of the lower end of the casing 1, recording the flow, the total accumulation and the pressure difference of the fracturing fluid and the rock-carrying fluid, and repeating the step two to determine the permeability of the experimental medium of the rock sample 15 under the action of the fracturing fluid and the fracturing fluid.
And step six, after the fracturing experiment is finished, taking out the rock sample 15, closing the running fracturing pump 211 and the confining pressure pump 221, closing the first regulating valve 212, the second regulating valve 222, the third regulating valve 231 and the fourth regulating valve 241, and reasonably treating the fracturing waste liquid.
The working principle is as follows: by utilizing the confining pressure pump 221, the upper base 12 and the lower base 13, the rock sample 15 is positioned under the condition of a triaxial pressure experiment, so that the accuracy of an experiment evaluation result is enhanced; the experimental contents of rock fracturing by shock waves, rock fracturing by different shock wave reinforced hydraulic fracturing modes, permeability testing before and after fracturing and the like can be simultaneously completed, and a foundation is provided for realizing high-efficiency development of a compact reservoir and improving the reservoir capacity through reservoir transformation measures.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a hydraulic fracturing evaluation experimental apparatus is reinforceed to pulse wave which characterized by: the device comprises a triaxial pressure experiment device, a fluid conveying control device and an experiment parameter monitoring device; wherein,
the triaxial pressure experimental device comprises a sleeve (1) with an opening at the top end, a shock wave generator (16) and a power supply control cabinet (17) electrically connected with the shock wave generator (16), wherein the top end of the sleeve (1) is hermetically connected with a cable sealer (11); a rock sample (15) is coaxially arranged in the sleeve (1), and a shock wave generator (16) is arranged in the rock sample (15); an upper base (12) abutting against the top surface of the rock sample (15) is arranged at the top end of the sleeve (1), and a lower base (13) abutting against the bottom surface of the rock sample (15) is arranged at the bottom end of the sleeve (1);
the fluid conveying control device comprises a fracturing fluid tank (2), a first pipeline (21), a second pipeline (22), a third pipeline (23) and a fourth pipeline (24); two ends of the first pipeline (21) are respectively communicated with the fracturing fluid tank (2) and the top end of the casing (1), a fracturing pump (211) is arranged at the inlet end, close to the fracturing fluid tank (2), of the first pipeline (21), and a first regulating valve (212) is arranged at the outlet end, close to the casing (1), of the first pipeline (21); two ends of the second pipeline (22) are respectively communicated with the fracturing fluid tank (2) and the inner side wall of the casing (1), a confining pressure pump (221) is arranged at the inlet end, close to the fracturing fluid tank (2), of the second pipeline (22), and a second regulating valve (222) is arranged at the outlet end, close to the casing (1), of the second pipeline (22); two ends of the third pipeline (23) are respectively communicated with the fracturing fluid tank (2) and the bottom end of the sleeve (1), and the third pipeline (23) is provided with a third regulating valve (231); two ends of the fourth pipeline (24) are respectively communicated with the center of the bottom ends of the fracturing fluid tank (2) and the sleeve (1), and the fourth pipeline (24) is provided with a fourth regulating valve (241);
the experimental parameter monitoring device comprises a data acquisition system (3), a flowmeter (32) and a pressure sensor (31), wherein the flowmeter (32) and the pressure sensor (31) are both connected with the data acquisition system (3); the flowmeter (32) is arranged on the third pipeline (23) and is positioned between the third regulating valve (231) and the sleeve (1); the pressure sensor (31) is arranged on the fourth pipeline (24) and is positioned between the fourth regulating valve (241) and the sleeve (1).
2. The experimental device for evaluating the pulse wave reinforced hydraulic fracturing as claimed in claim 1, wherein: and protective cushion layers (14) are arranged between the top end of the sleeve (1) and the upper base (12) and between the bottom end of the sleeve (1) and the lower base (13).
3. The experimental device for evaluating the pulse wave reinforced hydraulic fracturing as claimed in claim 2, wherein: the protective cushion layer (14) is an epoxy resin adhesive layer.
4. The experimental device for evaluating the pulse wave reinforced hydraulic fracturing as claimed in claim 1, wherein: the fourth pipeline (24) is provided with a filter (242), and the filter (242) is located between the fourth regulating valve (241) and the sleeve (1).
5. The experimental device for evaluating the pulse wave reinforced hydraulic fracturing as claimed in claim 1, wherein: the maximum load axial pressure of the triaxial pressure experimental device is 2800 and 3200KN, and the maximum confining pressure is 35-45 MPa.
6. The experimental device for evaluating the pulse wave reinforced hydraulic fracturing as claimed in claim 1, wherein: the diameter of the rock sample (15) is 0-50mm, and the length is 0-100 mm.
7. A pulse wave reinforced hydraulic fracturing evaluation experiment method is characterized by comprising the following steps: the method is based on the pulse wave reinforced hydraulic fracturing evaluation experimental device of any one of claims 1 to 6, and comprises the following steps:
s1: storing the prepared fracturing fluid meeting the experimental requirements in a fracturing fluid box (2) for later use, and selecting and preparing a test rock sample (15) meeting the experimental requirements for later use;
s2: measuring the permeability Kb of the rock sample (15) before fracturing; the method comprises the steps of putting a test rock sample (15) before fracturing into a casing (1), selecting formation water or standard brine as a flowing experiment medium, closing a first regulating valve (212) and opening a third regulating valve (231), and pressing the experiment medium into the rock sample (15) from the lower part of the casing (1) to start displacing; controlling the flow and pressure of the fluid through a third regulating valve (231), measuring the permeability of the rock sample (15) when the flow and pressure difference tend to be stable, recording the flow and pressure difference of the injected fluid, and programming a computer software program according to a calculation formula to calculate the permeability of the rock sample (15) and grasp the change condition of the permeability in real time;
s3, the test rock sample (15) is re-installed in the casing (1), and parameters of the triaxial pressure experimental device are adjusted according to experimental requirements;
s4, pressurizing by using a fracturing pump (211) to enable fracturing fluid to pass through a first regulating valve (212) to reach a shock wave generator (16), controlling the shock wave generator (16) through a power supply control cabinet (17), fracturing a rock sample (15) by the generated shock wave, enabling the fracturing fluid to flow out from the center of the lower end of a sleeve (1), flowing to a fracturing fluid tank (2) after passing through a fourth regulating valve (241), and recording various data in the experimental process after fracturing is finished;
s5, measuring the permeability Ka of the fractured rock sample (15): after the rock sample (15) is fractured by the shock wave, the first regulating valve (212) and the fourth regulating valve (241) are closed, and the flow and the pressure of the fluid are controlled through the third regulating valve (231); when the fracturing fluid flows out of the center of the lower end of the casing (1), recording the flow, total accumulation and pressure difference of the fracturing fluid and the rock-carrying fluid, and repeating the S2 method to determine the permeability of the experimental medium of the rock sample (15) under the action of the fracturing fluid and the fracturing fluid;
s6, after the fracturing experiment is finished, taking out the rock sample (15), closing the running fracturing pump (211) and confining pressure pump (221), closing the first regulating valve (212), the second regulating valve (222), the third regulating valve (231) and the fourth regulating valve (241), and reasonably treating the fracturing waste liquid.
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