CN110857906A - Rock hydraulic fracture dynamic monitoring system and determination method thereof - Google Patents
Rock hydraulic fracture dynamic monitoring system and determination method thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
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- G01N2203/0058—Kind of property studied
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- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention discloses a dynamic rock hydraulic fracture dynamic monitoring system and a measuring method thereof, wherein the dynamic rock hydraulic fracture dynamic monitoring system comprises the following steps: a CT scanning lens is arranged in the CT closed chamber; the rock clamping cylinder is arranged in the CT closed chamber, an elastic cylinder is arranged in the rock clamping cylinder, and a closed annular confining pressure cavity is formed between the outer wall of the elastic cylinder and the inner wall of the rock clamping cylinder; the confining pressure pump is connected with the annular confining pressure cavity; the output end of the axial pressure pump is connected with the upper part of the inner cavity of the rock clamping barrel; the sleeve is embedded into the core sample, the wall of the sleeve is provided with a plurality of water outlet holes, and the central hydraulic pump is connected with the sleeve through a pipeline; in the CT closed chamber, a measured core sample is pressurized by using an axial pressure pump and a confining pressure pump simultaneously, the stress condition of rock under the bottom layer is simulated, water pressure is applied to the interior of the core sample through a central water pressure pump, so that the rock cracks, and the CT scanning lens scans and records the fracturing process of the core sample in real time, thereby realizing dynamic continuous monitoring of the change characteristics of the core sample under the fracturing condition.
Description
Technical Field
The invention belongs to the technical field of oil development, and particularly relates to a dynamic rock hydraulic fracture dynamic monitoring system and a determination method thereof.
Background
At the initial stage of oil and gas exploitation, because the micro-cracks in the oil reservoir are in an open state, the permeability of the oil reservoir is higher than that of the conventional oil reservoir, and the daily oil yield of the oil reservoir is higher than that of the conventional oil reservoir. Along with the progress of the mining process, the pressure of the oil reservoir is reduced under the condition of no water injection and energy supplement, the micro-cracks of the oil reservoir are closed, and the permeability is reduced, so that the daily oil production is lower than that of the conventional oil reservoir. Most of large oil and gas fields in China enter the later exploitation stage, oil and gas resources of low-permeability oil and gas fields are expected to become power for future energy and economic development, and oil and gas in compact reservoirs can be economically exploited only by fracturing. The reasonable, efficient and economic development of such reservoirs is an important subject and problem in the development process of low permeability oil fields. The research of fracturing technology has been carried out in the fifty years in China, and good technical achievements and higher economic benefits have been obtained so far. Along with the development process of the oil field, the fracturing technology is continuously developed, perfected and improved aiming at different objects in different periods and different requirements on the transformation technology.
The method is characterized in that the change rule of the mechanical parameter characteristics of the rock under the fracturing condition is dynamically monitored, and the actual fracturing effect is simulated, so that the fracturing theory can be verified and researched, and the method is vital to the improvement of the fracturing technology.
Disclosure of Invention
In order to verify and research a fracturing theory, construct a monitoring process of rock fracturing simulation and simulate the effect of actual production fracturing, the rock hydraulic fracturing dynamic monitoring system and the measuring method thereof are provided.
In order to achieve the above object, according to an aspect of the present invention, there is provided a rock hydraulic fracture dynamic monitoring system, including:
the CT closed chamber is internally provided with a CT scanning lens;
the rock clamping cylinder is arranged in the CT closed chamber and used for placing a rock core sample, a cover body is arranged at the upper end of the rock clamping cylinder, a base is arranged at the lower end of the rock clamping cylinder, the CT scanning lens is aligned to the rock clamping cylinder, an elastic cylinder is arranged in the rock clamping cylinder, and a closed annular confining pressure cavity is formed between the outer wall of the elastic cylinder and the inner wall of the rock clamping cylinder;
the confining pressure pump is connected with the annular confining pressure cavity and is used for applying circumferential pressure to the elastic cylinder;
the output end of the axial pressure pump is connected with the upper part of the inner cavity of the rock clamping cylinder and is used for applying axial pressure to the elastic cylinder;
the sleeve is embedded into the core sample, and the wall of the sleeve is provided with a plurality of water outlet holes;
and the central hydraulic pump is connected with the sleeve through a pipeline.
Preferably, the resilient barrel is made of rubber, the sleeve is made of metal and the rock clamping barrel is made of reinforced polypropylene material.
Preferably, the system further comprises a pressure control system, wherein the pressure control system is respectively connected with the central hydraulic pump, the axial pressure pump and the confining pressure pump and is used for controlling the opening and closing of the central hydraulic pump, the axial pressure pump and the confining pressure pump, and the pressure value and the pressure applying time.
Preferably, the cover body is provided with a first through hole and a second through hole, a piston is arranged in the rock clamping cylinder, the piston separates an inner cavity of the rock clamping cylinder into a first cavity and a second cavity, the first cavity is communicated with the axial pressure pump through the first through hole, the elastic cylinder is arranged in the second cavity, and the central hydraulic pump penetrates through the second through hole through a pipeline to be connected with the sleeve.
Preferably, the rock clamping cylinder is in sealed connection with the cover and the base respectively.
Preferably, the axial pressure sensor and the circumferential pressure sensor are further included, the axial pressure sensor is arranged on the outer wall of the elastic cylinder, and the axial pressure sensor is arranged at the output end of the axial pressure pump.
Preferably, the rock sound wave parameter tester is further included and is used for measuring the compressive strength of the core sample.
According to another aspect of the invention, the measuring system for dynamically describing the rock hydraulic fracture mechanism is used for providing a measuring method for dynamically monitoring rock hydraulic fracture, and the method comprises the following steps:
drilling a hole in the core sample, and embedding a sleeve into the hole;
putting the core sample into a rock clamping cylinder, and starting a confining pressure pump and an axial pressure pump to apply circumferential and axial pressures to the core sample in the rock clamping cylinder to a preset pressure value;
and starting the central hydraulic pump to enable the liquid to fracture the core sample through the plurality of water outlet holes of the sleeve, and simultaneously performing real-time CT scanning on the core sample to obtain scanning data.
Preferably, the scan data includes fracture azimuth length, height, shape, and fracture ductility of the core sample.
Preferably, before the core sample is put into the rock holding cylinder, the method further comprises the following steps: and carrying out sound wave test on the core sample by using a rock sound wave parameter tester to obtain the compressive strength of the core sample.
Preferably, the predetermined pressure value is set according to the compressive strength.
The invention has the following beneficial effects: in a CT closed chamber, a measured core sample is pressurized by an axial pressure pump and a confining pressure pump at the same time, pressure maintaining is carried out, the stress condition of rock under the bottom layer is simulated, water pressure is applied to the interior of the core sample through a central water pressure pump, so that the rock is cracked, a CT scanning lens scans and records the fracturing process of the core sample in real time, scanning data is obtained, so that crack extension analysis is carried out on the core sample, the change characteristics of the core sample under the fracturing condition are dynamically and continuously monitored, the actual mechanical characteristics of the core sample under the stratum are obtained, the effect of actual microseism exploration and development is simulated, the fracturing theory is verified and researched, and the research result of the fracturing theory has important significance for guiding the development and application of oil and gas fields, unconventional shale gas and coal bed gas.
The change characteristics of the core sample under the fracturing condition can be dynamically and continuously monitored, so that the effect of simulating actual microseismic exploration and development is achieved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings. Wherein like reference numerals generally represent like parts throughout the exemplary embodiments.
Fig. 1 shows a schematic structural diagram of a rock hydraulic fracture dynamic monitoring system in one embodiment of the invention.
Fig. 2 shows a flow chart of core sample pressurization for a rock hydraulic fracture dynamic monitoring system in one embodiment of the invention.
Fig. 3 shows a flow chart of a determination method for dynamic monitoring of hydraulic fracture of rock in an embodiment of the invention.
Description of reference numerals:
1. a CT closed room; 2. a CT scanning lens; 3. a core sample; 4. a rock clamping barrel; 5. a sample stage; 6. a confining pressure pump; 7. an axial compression pump; 8. a central hydraulic pump; 9. a pressure control system; 10. an elastic cylinder; 11. a piston.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
An embodiment of the present invention provides a rock hydraulic fracture dynamic monitoring system, including:
a CT scanning lens is arranged in the CT closed chamber; the rock clamping cylinder is arranged in the CT closed chamber and used for placing a rock core sample, a cover body is arranged at the upper end of the rock clamping cylinder, a base is arranged at the lower end of the rock clamping cylinder, the CT scanning lens is aligned to the rock clamping cylinder, an elastic cylinder is arranged in the rock clamping cylinder, and a closed annular confining pressure cavity is formed between the outer wall of the elastic cylinder and the inner wall of the rock clamping cylinder; the confining pressure pump is connected with the annular confining pressure cavity and is used for applying circumferential pressure to the elastic cylinder; the output end of the axial pressure pump is connected with the upper part of the inner cavity of the rock clamping cylinder and is used for applying axial pressure to the elastic cylinder; the sleeve is embedded into the core sample, and the wall of the sleeve is provided with a plurality of water outlet holes; the central hydraulic pump is connected with the sleeve through a pipeline.
Specifically, in a CT closed chamber, an elastic cylinder is arranged in a rock clamping cylinder, an annular confining pressure cavity is formed between the outer wall of the elastic cylinder and the inner wall of the rock clamping cylinder, a confining pressure pump is connected with the annular confining pressure cavity to apply circumferential pressure on a rock core sample in the rock clamping cylinder, an axial pressure pump is connected with the upper part of an inner cavity of the rock clamping cylinder to apply axial pressure on the rock clamping cylinder and simulate the stress condition of the rock core sample under the bottom layer; the sleeve is embedded in the core sample, and the central hydraulic pump is connected with the sleeve through a pipeline. The wall of the barrel is provided with a plurality of water outlet holes, the central hydraulic pump pressurizes water and then sprays the water out of the water outlet holes to apply water pressure to the interior of the rock core sample, so that cracks are generated on the rock, a CT scanning lens is used for scanning and recording the fracturing process of the rock core sample in real time, and the change characteristics of the rock core sample under the fracturing condition are dynamically and continuously monitored by using the simulated oil well fracturing principle, so that the actual mechanical characteristics of the rock core sample under the stratum are obtained, and the effect of simulating actual microseism exploration and development is achieved.
Preferably, the resilient barrel is made of rubber, the sleeve is made of metal and the rock clamping barrel is made of reinforced polypropylene material.
In particular, the rock clamping cylinder is made of a non-metallic reinforced polypropylene material that is transparent to x-rays to enable dynamic scanning of the sample.
More preferably, the core holding barrel can be made of Polyetheretherketone (PEEK), which is a special engineering plastic with excellent properties of high temperature resistance, self lubrication, easy processing, high mechanical strength and the like, and can be manufactured and processed into various mechanical parts, and the material can also be penetrated by x-ray, thereby realizing dynamic scanning of the sample.
Particularly, when the sleeve made of the metal material is embedded into the core sample to perform a hydraulic fracturing experiment, the sleeve has good strength.
Preferably, the system further comprises a pressure control system, wherein the pressure control system is respectively connected with the central hydraulic pump, the axial pressure pump and the confining pressure pump and is used for controlling the opening and closing of the central hydraulic pump, the axial pressure pump and the confining pressure pump, and the pressure application value and the pressure application time.
Specifically, the pressurizing actions and the pressures of the confining pressure pump, the axial pressure pump and the central hydraulic pressure pump can be controlled independently or simultaneously through the pressure control system, the pressurization to a pressure preset value and the continuous pressurization to a final pressure value can be controlled automatically, and the applied pressure and the applied stroke can be adjusted at will in a specified range.
As the preferred scheme, be equipped with first through-hole and second through-hole on the lid, be equipped with the piston in the rock clamping cylinder, the inner chamber that the piston keeps apart the rock clamping cylinder is first cavity and second cavity, and first cavity passes through first through-hole and axle pressure pump intercommunication, and the elastic cylinder is located in the second cavity, and central hydraulic pump passes the second through-hole through the pipeline and is connected with the muffjoint.
Specifically, after the axial pressure pump is started, the first chamber is communicated with the axial pressure pump through the first through hole, pressure liquid is injected into the first chamber, the piston is pushed to downwards compress the rock core, and loading of axial pressure is achieved.
Specifically, the rock core is placed into the elastic cylinder, water is injected into an annular confining pressure cavity between the outer wall of the elastic cylinder and the inner wall of the rock clamping cylinder for pressurization, the elastic cylinder is squeezed to the circumferential surface of the rock core sample, and confining pressure loading is achieved.
As preferred scheme, a rock clamping cylinder is respectively connected with the cover body and the base in a sealing mode, and air tightness when the rock core sample is subjected to pressure confining pressure is guaranteed.
As preferred scheme, still include axial pressure sensor and circumference pressure sensor, axial pressure sensor sets up in the outer wall of elastic cylinder, and axial pressure sensor locates the output of axial compression pump.
Specifically, the circumferential pressure value to which the core sample is subjected is detected through an axial pressure sensor, and the axial pressure value to which the core sample is subjected is detected through an axial pressure sensor.
Specifically, the axial pressure sensor and the circumferential pressure sensor are respectively connected with the pressure control system and used for detecting whether a pressure preset value applied to the core sample by the axial pressure pump and the confining pressure pump is consistent with an actual pressure value detected by the sensor, and if the detected pressure value does not reach the pressure preset value, the pressure system controls the axial pressure pump and/or the confining pressure pump to continuously apply pressure until the axial pressure and the circumferential pressure preset value applied to the core sample are reached.
As a preferable scheme, the test device further comprises a rock sound wave parameter tester, and the rock sound wave parameter tester is used for measuring the compressive strength of the core sample.
Specifically, the rock acoustic parameter tester is used for evaluating the mechanical property of the core sample by measuring the propagation characteristic parameters of acoustic waves in the core sample, and provides a basis for setting a pressure preset value for the core sample.
According to another aspect of the present invention, there is provided a method for dynamically monitoring hydraulic fracture of rock, the method comprising the steps of:
step 1: drilling a hole in the core sample, and embedding a sleeve into the hole;
specifically, firstly, a core sample is manufactured, the external dimension of the core sample meets the size requirement of the volume of the inner cavity of the rock clamping cylinder, then the top surface of the core sample is punched, and the sleeve is stuck and embedded into the hole.
Step 2: putting the core sample into a rock clamping cylinder, and starting a confining pressure pump and an axial pressure pump to apply circumferential and axial pressures to the core sample in the rock clamping cylinder to a preset pressure value;
specifically, a rock sound wave parameter tester is used for conducting sound wave testing on the core sample to obtain the compressive strength of the core sample, and a pressure preset value is set according to the compressive strength.
Specifically, the process of applying axial and axial pressure comprises the steps of:
firstly, setting a pressure preset value; and performing sound wave test on the core sample by using a rock sound wave parameter tester to obtain the compressive strength of the core sample, and setting a pressure preset value according to the compressive strength.
Secondly, starting pressurization; and starting the hydraulic pump and the confining pressure pump through the pressure control system to apply pressure to the core sample.
Thirdly, starting pressure detection; and detecting the pressure value to which the core sample is subjected through the axial pressure sensor and the circumferential pressure sensor.
Then, comparing the detected pressure value with a preset pressure value; and if the pressure value is smaller than the preset pressure value, continuing to detect the pressure value, and if the pressure value is larger than the preset pressure value, suspending pressurization and detecting the axial pressure and the circumferential pressure value of the core sample.
Then, it is judged whether or not the pressurization can be continued, or the pressurization is stopped, and the pressure holding is performed.
And step 3: and starting the central hydraulic pump to enable the liquid to fracture the core sample through the plurality of water outlet holes of the sleeve, and simultaneously performing real-time CT scanning on the core sample to obtain scanning data.
Specifically, in the pressure maintaining process, after a set value is reached, high-pressure liquid is used for fracturing a designated position through a water outlet hole in the front end of the sleeve to crack the rock, CT scanning is carried out on a rock core sample consistently in the process, scanning data is stored in a computer, and a fracturing result is evaluated.
Preferably, the scan data includes fracture azimuth length, height, shape, and fracture ductility of the core sample.
In particular, the scan data may be used to determine the azimuthal length, height, shape of the fracture and to analyze the propagation of the fracture.
Example 1
Fig. 1 shows a schematic structural diagram of a rock hydraulic fracture dynamic monitoring system in one embodiment of the invention.
As shown in fig. 1, an embodiment provides a rock hydraulic fracture dynamic monitoring system, including:
the CT device comprises a CT closed chamber 1, wherein a CT scanning lens 2 is arranged in the CT closed chamber 1; the rock clamping cylinder 4 is arranged in the CT closed chamber 1 and located on the sample workbench 5, the rock clamping cylinder 4 is used for placing a rock core sample 3, a cover body is arranged at the upper end of the rock clamping cylinder 4, a base is arranged at the lower end of the rock clamping cylinder 4, and the rock clamping cylinder 4 is respectively connected with the cover body and the base in a sealing mode.
The CT scanning lens 2 is aligned to the rock clamping barrel 4, an elastic barrel is arranged in the rock clamping barrel 4, and a closed annular confining pressure cavity is formed between the outer wall of the elastic barrel and the inner wall of the rock clamping barrel 4; the confining pressure pump 8 is connected with the annular confining pressure cavity and used for applying circumferential pressure to the elastic cylinder 10; the output end of the axial pressure pump 7 is connected with the upper part of the inner cavity of the rock clamping cylinder 4 and is used for applying axial pressure to the elastic cylinder 10; a sleeve (not shown) embedded in the core sample 3, wherein the wall of the sleeve is provided with a plurality of water outlet holes; the central hydraulic pump 8, the central hydraulic pump 8 is connected with the sleeve through a pipeline.
Be equipped with first through-hole and second through-hole on the lid, be equipped with piston 11 in the rock clamping cylinder 4, piston 11 keeps apart the inner chamber of rock clamping cylinder 4 for first cavity and second cavity, and first cavity passes through first through-hole and axle pressure pump 7 intercommunication, and in the second cavity was located to elastic tube 10, central hydraulic pump 8 passed the second through-hole through the pipeline and bushing.
The resilient barrel is made of rubber, the sleeve is made of metal and the rock-gripping barrel 4 is made of reinforced polypropylene material. The device is characterized by further comprising a pressure control system 9, wherein the pressure control system 9 is respectively connected with the central hydraulic pump 8, the axial pressure pump 7 and the confining pressure pump 6 and used for controlling the opening and closing of the central hydraulic pump 8, the axial pressure pump 7 and the confining pressure pump 6 and applying pressure values and pressure application time. The axial pressure sensor (not shown) and the circumferential pressure sensor (not shown) are further included, the axial pressure sensor is arranged on the outer wall of the elastic cylinder, and the axial pressure sensor is arranged at the output end of the axial pressure pump 7. And the rock sound wave parameter tester (not shown) is further included and is used for measuring the compressive strength of the core sample.
In the CT closed chamber, an axial pressure pump 7 and a confining pressure pump 6 are controlled by a pressure control system 9 to apply axial pressure and circumferential pressure to the core sample 3 in the rock clamping cylinder 4. After the axial pressure pump 7 is started, the first chamber is communicated with the axial pressure pump 7 through a first through hole, pressure liquid is injected into the first chamber, the piston 11 is pushed to downwards compress the rock core, and axial pressure loading is realized; injecting water into an annular confining pressure cavity between the outer wall of the elastic cylinder 10 and the inner wall of the rock clamping cylinder 4 for pressurization, so that the elastic cylinder 10 is squeezed to the circumferential surface of the rock core sample 3 to realize confining pressure loading; the central hydraulic pump 8 pressurizes water and then sprays the water from the water outlet hole to apply hydraulic pressure to the interior of the rock core sample, so that the rock is cracked, the CT scanning lens is used for scanning and recording the fracturing process of the rock core sample in real time, the change characteristics of the rock core sample under the fracturing condition are dynamically and continuously monitored, the actual mechanical characteristics of the rock core sample under the stratum are obtained, and the effect of simulating actual microseism exploration and development is achieved.
Example 2
Fig. 2 shows a flow chart of core sample pressurization of a rock hydraulic fracture dynamic monitoring system in an embodiment of the invention, and fig. 3 shows a flow chart of a determination method of rock hydraulic fracture dynamic monitoring in an embodiment of the invention.
As shown in fig. 3, the embodiment provides a measuring method for dynamic monitoring of rock hydraulic fracture, which comprises the following steps:
step 1: drilling a hole in the core sample, and embedding a sleeve into the hole;
step 2: putting the core sample into a rock clamping cylinder, and starting a confining pressure pump and an axial pressure pump to apply circumferential and axial pressures to the core sample in the rock clamping cylinder to a preset pressure value;
and performing sound wave test on the core sample by using a rock sound wave parameter tester to obtain the compressive strength of the core sample, and setting a pressure preset value according to the compressive strength.
As shown in fig. 2, the process of applying axial and axial pressure includes the steps of:
firstly, setting a pressure preset value; and performing sound wave test on the core sample by using a rock sound wave parameter tester to obtain the compressive strength of the core sample, and setting a pressure preset value according to the compressive strength.
Secondly, starting pressurization; and starting the hydraulic pump and the confining pressure pump through the pressure control system to apply pressure to the core sample.
Thirdly, starting pressure detection; and detecting the pressure value to which the core sample is subjected through the axial pressure sensor and the circumferential pressure sensor.
Then, judging whether the detected pressure value is smaller than a preset pressure value or not; and if the pressure value is smaller than the preset pressure value, continuing to detect the pressure value, and if the pressure value is larger than the preset pressure value, suspending pressurization and checking the axial pressure value and the circumferential pressure value of the core sample.
Then, it is judged whether or not the pressurization can be continued, or the pressurization is stopped, and the pressure holding is performed.
And step 3: and starting a central hydraulic pump to enable liquid to fracture the core sample through a plurality of water outlet holes of the sleeve, and simultaneously performing real-time CT scanning on the core sample to obtain scanning data, wherein the scanning data comprises the fracture azimuth length, height, shape and fracture ductility of the core sample.
In the pressure maintaining process, after a set value is reached, high-pressure liquid is used for fracturing the designated position through a water outlet hole at the front end of the sleeve, so that the rock is cracked, CT scanning is consistently carried out on the rock core sample in the process, scanning data is stored in a computer, and the fracturing result is evaluated.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A rock hydraulic fracture dynamic monitoring system, comprising:
the CT closed chamber is internally provided with a CT scanning lens;
the rock clamping cylinder is arranged in the CT closed chamber and used for placing a rock core sample, a cover body is arranged at the upper end of the rock clamping cylinder, a base is arranged at the lower end of the rock clamping cylinder, the CT scanning lens is aligned to the rock clamping cylinder, an elastic cylinder is arranged in the rock clamping cylinder, and a closed annular confining pressure cavity is formed between the outer wall of the elastic cylinder and the inner wall of the rock clamping cylinder;
the confining pressure pump is connected with the annular confining pressure cavity and is used for applying circumferential pressure to the elastic cylinder;
the output end of the axial pressure pump is connected with the upper part of the inner cavity of the rock clamping cylinder and is used for applying axial pressure to the elastic cylinder;
the sleeve is embedded into the core sample, and the wall of the sleeve is provided with a plurality of water outlet holes;
and the central hydraulic pump is connected with the sleeve through a pipeline.
2. The dynamic rock hydraulic fracture monitoring system of claim 1, wherein the resilient cartridge is made of rubber, the sleeve is made of metal, and the rock clamping cartridge is made of reinforced polypropylene material.
3. The dynamic rock hydraulic fracture monitoring system as claimed in claim 1, further comprising a pressure control system, wherein the pressure control system is connected to the central hydraulic pump, the axial pressure pump and the confining pressure pump respectively, and is used for controlling the opening and closing of the central hydraulic pump, the axial pressure pump and the confining pressure pump, and the pressure value and the pressure application time.
4. The dynamic rock hydraulic fracture monitoring system of claim 1, wherein the cover body is provided with a first through hole and a second through hole, the rock clamping cylinder is provided with a piston therein, the piston separates an inner cavity of the rock clamping cylinder into a first cavity and a second cavity, the first cavity is communicated with the axial pressure pump through the first through hole, the elastic cylinder is arranged in the second cavity, and the central hydraulic pump passes through the second through hole through a pipeline and is connected with the sleeve.
5. The dynamic rock hydraulic fracture monitoring system of claim 1, further comprising an axial pressure sensor and a circumferential pressure sensor, wherein the axial pressure sensor is arranged on the outer wall of the elastic cylinder, and the axial pressure sensor is arranged at the output end of the axial pressure pump.
6. The dynamic rock hydraulic fracture monitoring system as claimed in claim 1, further comprising a rock acoustic parameter tester for determining the compressive strength of the core sample.
7. An assay method for dynamic monitoring of hydraulic rock fracturing, which utilizes an assay system for dynamic profiling of hydraulic rock fracturing mechanisms according to any one of claims 1 to 6, the method comprising the steps of:
drilling a hole in the core sample, and embedding a sleeve into the hole;
putting the core sample into a rock clamping cylinder, and starting a confining pressure pump and an axial pressure pump to apply circumferential and axial pressures to the core sample in the rock clamping cylinder to a preset pressure value;
and starting the central hydraulic pump to enable the liquid to fracture the core sample through the plurality of water outlet holes of the sleeve, and simultaneously performing real-time CT scanning on the core sample to obtain scanning data.
8. An assay method for dynamic monitoring of hydraulic fracturing of rock as claimed in claim 7 wherein the scan data includes fracture azimuth length, height, shape and fracture ductility of the core sample.
9. A method for determining hydraulic fracture dynamic rock monitoring as claimed in claim 7, wherein before the core sample is placed in the rock holding cylinder, the method further comprises: and carrying out sound wave test on the core sample by using a rock sound wave parameter tester to obtain the compressive strength of the core sample.
10. A method of determining hydraulic fracture dynamic monitoring of rock according to claim 9, wherein said predetermined pressure value is set in accordance with said compressive strength.
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