CN109975140A - Supercritical carbon dioxide pulse fracturing and permeability testing integrated experimental device and method - Google Patents
Supercritical carbon dioxide pulse fracturing and permeability testing integrated experimental device and method Download PDFInfo
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- CN109975140A CN109975140A CN201910305306.0A CN201910305306A CN109975140A CN 109975140 A CN109975140 A CN 109975140A CN 201910305306 A CN201910305306 A CN 201910305306A CN 109975140 A CN109975140 A CN 109975140A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 230000035699 permeability Effects 0.000 title claims abstract description 38
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 34
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000011065 in-situ storage Methods 0.000 claims abstract description 10
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 70
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000002474 experimental method Methods 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- 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
- G01N2203/0067—Fracture or rupture
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fluid Mechanics (AREA)
- Dispersion Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses an experimental device and method for integrating supercritical carbon dioxide pulse fracturing and permeability testing, and the experimental device and method comprise a first gas source, a second gas source, a carbon dioxide gas source, a first throttle valve, a second throttle valve, a pneumatic valve, a solenoid valve, an air compressor, a time relay, a conversion module, a control host with a data acquisition function, a first flowmeter, a second flowmeter, a first pressure sensor, a second pressure sensor, a temperature sensor, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a gas recovery tank and an in-situ environment simulation system, wherein the in-situ environment simulation system comprises a rock core clamper, a temperature control cavity and an axial confining pressure loading terminal, can realize the original permeability testing of a rock core before fracturing, the supercritical carbon dioxide pulse fracturing of the rock core and the permeability testing of the rock core after fracturing, and has intelligentization, Convenient operation and the like, and more vividly simulates the field working conditions, thereby ensuring that the measurement result is more real and accurate.
Description
Technical field
The present invention relates to Unconventional gas to develop experimental field, and in particular to a kind of supercritical carbon dioxide pulse fracturing
Test integrated experimental provision and method with permeability.
Background technique
The critical period that China is in energy demand growth and Energy restructuring is changed, country vigorously advocates unconventional
The development and utilization of natural gas supplies insufficient pressure for alleviating conventional gas and oil, pushes the lasting health of China's economic society
Development.But the rock formation permeability of Unconventional gas (such as coal bed gas, shale gas) is very low, it is common at present to increase
The method of reservoir permeability is mainly hydraulic fracturing technology, but is increasing Oil in Super-low Permeability Reservoirs gas permeability using hydraulic fracturing technology
When have the following problems: (1) deep rock reservoir ground stress deviation is increasing, control action of the high-ground stress difference to hydraulic fracture
It is increasingly stronger, it is easy to appear single major fracture, it is undesirable to the correctional effect of reservoir；(2) the common pressure break of hydraulic fracturing technology
Liquid contains a variety of chemical reagent, and fracturing fluid is easy to generate water-sensitive, water-blocking effect with reservoir, this makes fracturing fluid on injury stratum
While reduce methane flow channel, cause recovery ratio relatively low；(3) a large amount of fracturing fluid injection stratum may induce earthquake etc.
Secondary disaster；(4) most hydraulic fracturing experiments measure permeability after taking out core sample after pressure break again, lead to core sample
Product have stress release, therefore permeability test result and truth have different.
Summary of the invention
The object of the present invention is to provide a kind of supercritical carbon dioxide pulse fracturings and the test integrated experiment of permeability
Device and method, to realize the supercritical carbon dioxide pulse fracturing low permeability reservoir experiment under the conditions of simulating multi- scenarios method, simultaneously
Drill core permeability rate before and after in-situ test pressure break.
Supercritical carbon dioxide pulse fracturing of the present invention and the test integrated experimental provision of permeability, including the
One gas source, the second gas source, carbon dioxide air source, first throttle valve, second throttle, pneumatic operated valve, solenoid valve, air compressor machine, time
Relay, conversion module, the control host with data acquisition function, first flowmeter, second flowmeter, first pressure sensing
Device, second pressure sensor, temperature sensor, the first shut-off valve, the second shut-off valve, third shut-off valve, the 4th shut-off valve, gas
Recycling can and in situ environment simulation system, the in situ environment simulation system include rock core fastener, temperature control body and axis
Confining pressure loads terminal, and rock core fastener, temperature sensor are mounted in temperature control body, and temperature control body is for providing reality
Test required temperature, temperature sensor for measuring the intracorporal temperature of temperature control, axis confining pressure load terminal by pipeline with
Rock core fastener connection, axis confining pressure load terminal inject oil pressure into rock core fastener, are in the core in rock core fastener
In the axis pressure and confining pressure environment of requirement of experiment；First gas source is connected by the arrival end of the first shut-off valve, steel pipe and first throttle valve
It connects, carbon dioxide air source is connected by the arrival end of third shut-off valve, steel pipe and first throttle valve, the outlet of first throttle valve
End, pneumatic operated valve, first flowmeter, rock core fastener arrival end be sequentially connected by steel pipe, the outlet end of rock core fastener,
Two flowmeters, the 4th shut-off valve, gas recycling can are sequentially connected by steel pipe, the second gas source by the second shut-off valve, steel pipe with
The arrival end of second throttle connects, and the outlet end of second throttle is connected to second flowmeter and the 4th shut-off valve by steel pipe
Between；The control terminal of pneumatic operated valve is connected by pipeline, solenoid valve and air compressor machine, and the control terminal of solenoid valve passes through signal wire and time
Relay electrical connection, the time relay are electrically connected by signal wire, conversion module with the control host, first pressure sensor
Through piping connection between first flowmeter and the arrival end of rock core fastener, for measuring the arrival end of rock core fastener
Gas pressure, second pressure sensor between the outlet end and second flowmeter of rock core fastener, are used for by piping connection
Measure the gas pressure of the outlet end of rock core fastener, first pressure sensor, second pressure sensor, first flowmeter, the
Two flowmeters, temperature sensor all pass through signal wire and are electrically connected respectively with control host.
Preferably, by the outlet end of first throttle valve, pneumatic operated valve, first flowmeter, rock core fastener arrival end successively
The outer wall of the steel pipe of connection is provided with heating mantle, carries out a degree of preheating to CO 2 medium using heating mantle, can be more
It is good to guarantee that supercritical carbon dioxide is become faster after CO 2 medium enters core.
Preferably, overflow valve, overflow valve energy mould are connected on the steel pipe between the 4th shut-off valve and gas recycling can
The leak-off of pit shaft acts on inside core when quasi- pressure break.
Preferably, first gas source, the second gas source are all methane gas source or helium gas source.
Supercritical carbon dioxide pulse fracturing of the present invention and the test integrated experimental method of permeability, in use
Experimental provision is stated, is included the following steps:
S1, under conditions of the experimental provision meets leakproofness, the core sample made is closed with gum cover to put
Enter in the rock core fastener, axis confining pressure load terminal injects oil pressure into rock core fastener, and core is made to be in requirement of experiment
In axis pressure and confining pressure environment；
S2, third shut-off valve is closed, opens the first shut-off valve, the second shut-off valve, the 4th shut-off valve, control pneumatic operated valve is beaten
It opens, adjusts first throttle valve, second throttle, to be passed through pressure to the entrance of core holding unit simultaneously as P10Gas (P10By
First pressure sensor measures), it is P that the outlet to core holding unit, which is passed through pressure,20Gas (P20By second pressure sensor
Measure), P20< P10, a pressure pulse is formed, the first shut-off valve, the second shut-off valve are then shut off；
S3, control host automatically record the pressure of the arrival end for the rock core fastener that first pressure sensor measures, second
The pressure of the outlet end for the rock core fastener that pressure sensor measures forms pressure history, the entrance to rock core fastener
After the pressure at end and the pressure of its outlet end are stablized, core original permeability K is calculated using pulse attenuation method formula0；
S4, the temperature that temperature control body is arranged can guarantee carbon dioxide to preset temperature, the experiment preset temperature is tested
Medium can become supercritical carbon dioxide after entering core；
S5, the pulse fracturing Digital Control software controlled in host is opened, waveform, the frequency, vibration of pulsed flow is set
Width parameter；
S6, the first shut-off valve, the second shut-off valve are closed, opens third shut-off valve, the 4th shut-off valve, adjust first throttle
Valve, control host controls solenoid valve by the pulse signal that conversion module, the time relay are converted, and then controls pneumatic operated valve, makes
CO 2 medium forms pulsed flow and enters inside core, becomes supercritical carbon dioxide, generates pulse fracturing to core；
S7, after the completion of pulse fracturing, close third shut-off valve, open the first shut-off valve, the second shut-off valve, the 4th cut-off
Valve, control pneumatic operated valve are opened, and first throttle valve, second throttle are adjusted, logical to the arrival end of core holding unit to continue simultaneously
The pressure for entering constant-pressure stable is P11Gas (P11Measured by first pressure sensor), it is passed through to the outlet end of core holding unit
The pressure of constant-pressure stable is P21Gas (P21Measured by second pressure sensor), control host automatically records first pressure biography
The pressure of the outlet end for the rock core fastener that the pressure of the arrival end for the rock core fastener that sensor measures, second pressure sensor measure
The flow of power and the acquisition of the first, second flowmeter, is calculated post-fracturing drill core permeability rate K using level pressure steady state method formula1。
Core original permeability K in the step S30It is calculated by formula (1), formula (2) (i.e. pulse attenuation method formula)
It obtains:
In formula, P1For the steady pressure of the arrival end of rock core fastener after the t time, P2For after the t time core press from both sides
The steady pressure of the outlet end of holder, A are core area of section, and L is the length of core, and μ is gas viscosity, and β is gas compression
Coefficient, V1The gas volume in steel pipe between the arrival end of the first shut-off valve to rock core fastener, V2For rock core fastener
Outlet end is to the gas volume in the steel pipe between the second shut-off valve, A, L, μ, β, V1、V2It is all known parameters.
Post-fracturing drill core permeability rate K in the step S71Calculation formula are as follows:
In formula, A is core area of section, and L is the length of core, and μ is gas viscosity, and Q is the gas flow by core
(i.e. the flow of second flowmeter acquisition), A, L, μ are known parameters.
The present invention realizes the supercritical carbon dioxide pulse fracturing under the conditions of simulation multi- scenarios method (temperature field, pressure field)
Low permeability reservoir experiment realizes the Digitization Software manipulation of impulse waveform, frequency, amplitude, while can in-situ test pressure break front and back
Drill core permeability rate, have many advantages, such as relative to traditional means of experiment and experimental facilities intelligent, easy to operate, and pass through original
Position environmental simulation system it is more true to nature simulate field working conditions, thus make measurement result it is more true, accurately.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the experimental provision in the present invention.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
Supercritical carbon dioxide pulse fracturing and the test integrated experimental provision of permeability as shown in Figure 1, including the
One gas source 1, the second gas source 2, carbon dioxide air source 3, first throttle valve 4, second throttle 5, pneumatic operated valve 6, solenoid valve 7, pneumatics
Machine 8, the time relay 9, conversion module 10, the control host 11 with data acquisition function, first flowmeter 12, second flow
Count 13, first pressure sensor 14, second pressure sensor 15, temperature sensor 16, the first shut-off valve 17, the second shut-off valve
18, third shut-off valve 19, the 4th shut-off valve 20, overflow valve 25, gas recycling can 24 and in situ environment simulation system, the first gas source
1, the second gas source 2 is all methane gas source (being also possible to helium gas source)；In situ environment simulation system includes 21 (rock of rock core fastener
The specific structure of core holder 21 is referring to the description in CN206410979U), temperature control body 22 and axis confining pressure load terminal
23, rock core fastener 21, temperature sensor 16 are mounted in temperature control body 22, axis confining pressure load terminal 23 by pipeline with
Rock core fastener 21 is connected to, and temperature control body 22 can provide room temperature to the temperature between 200 DEG C；First gas source 1 passes through the
The arrival end of one shut-off valve 17, steel pipe and first throttle valve 4 connects, carbon dioxide air source 3 by third shut-off valve 19, steel pipe with
The arrival end of first throttle valve 4 connects, the outlet end of first throttle valve 4, pneumatic operated valve 6, first flowmeter 12, rock core fastener 21
Arrival end be sequentially connected by the steel pipe that outer wall is provided with heating mantle, the outlet end of rock core fastener 21, second flowmeter 13,
4th shut-off valve 20, overflow valve 25, gas recycling can 24 are sequentially connected by steel pipe, the second gas source 2 by the second shut-off valve 18,
Steel pipe is connect with the arrival end of second throttle 5, the outlet end of second throttle 5 by steel pipe be connected to second flowmeter 13 with
Between 4th shut-off valve 20；The control terminal of pneumatic operated valve 6 is connect by pipeline, solenoid valve 7 with air compressor machine 8, the control terminal of solenoid valve 7
It is electrically connected by signal wire with the time relay 9, the time relay 9 passes through 11 electricity of signal wire, conversion module 10 and control host
Connection, first pressure sensor 14 pass through piping connection between first flowmeter 12 and the arrival end of rock core fastener 21, the
Through piping connection between the outlet end and second flowmeter 13 of rock core fastener 21, first pressure passes two pressure sensors 15
Sensor 14, second pressure sensor 15, first flowmeter 12, second flowmeter 13, temperature sensor 16 all pass through signal wire point
It is not electrically connected with control host 11.
Supercritical carbon dioxide pulse fracturing and the test integrated experiment side of permeability are carried out using above-mentioned experimental provision
Method includes the following steps:
S1, under conditions of experimental provision meets leakproofness, the core made (sample) is closed with gum cover to be put into
In rock core fastener 21, axis confining pressure load terminal 23 injects oil pressure into rock core fastener 21, and core 26 is made to be in requirement of experiment
Axis pressure and confining pressure environment in, simulated ground stress.
S2, third shut-off valve 19 is closed, opens the first shut-off valve 17, the second shut-off valve 18, the 4th shut-off valve 20, control gas
Dynamic valve 6 is opened, and first throttle valve 4, second throttle 5 are adjusted, to be passed through pressure to the entrance of core holding unit 21 simultaneously as P10
Gas (P10Measured by first pressure sensor 14), being passed through pressure to the outlet of core holding unit 21 is P20Gas (P20By
Second pressure sensor 15 measures), P20< P10, a pressure pulse is formed, the cut-off of the first shut-off valve 17, second is then shut off
Valve 18.
S3, control host 11 automatically record the pressure of the arrival end for the rock core fastener 21 that first pressure sensor 14 measures
The pressure of the outlet end for the rock core fastener 21 that power, second pressure sensor 15 measure forms pressure history, presss from both sides to core
After the pressure of the arrival end of holder 21 and the pressure of its outlet end are stablized, using formula (1), formula (2), (i.e. pulse attenuation method is public
Formula) core original permeability K is calculated0:
In formula, P1For the steady pressure of the arrival end of rock core fastener after the t time, P2For after the t time core press from both sides
The steady pressure of the outlet end of holder, A are core area of section, and L is the length of core, and μ is gas viscosity, and β is gas compression
Coefficient, V1The gas volume in steel pipe between the arrival end of the first shut-off valve to rock core fastener, V2For rock core fastener
Outlet end is to the gas volume in the steel pipe between the second shut-off valve, A, L, μ, β, V1、V2It is all known parameters.
S4, be arranged temperature control body 22 temperature to predetermined temperature (by control host 11 progress real time temperature monitoring),
It is preheated using steel pipe of the heating mantle to package, guarantees that overcritical titanium dioxide can be become after CO 2 medium enters core 26
Carbon.
S5, the pulse fracturing Digital Control software (for existing software) controlled in host 11 is opened, pulsed flow is set
Waveform, frequency, amplitude parameter.
S6, the first shut-off valve 17, the second shut-off valve 18 are closed, opens third shut-off valve 19, the 4th shut-off valve 20, adjust the
One throttle valve 4, the leak-off of pit shaft acts on inside core when adjustment overflow valve 25 simulates pressure break, and control host 11 passes through conversion module
10, the pulse signal that the time relay 9 is converted controls solenoid valve 7, and then controls pneumatic operated valve 6, and CO 2 medium is made to form arteries and veins
Swash of wave body enters inside core 26, becomes supercritical carbon dioxide, generates pulse fracturing to core 26.
S7, after the completion of pulse fracturing, close third shut-off valve 19, open the first shut-off valve 17, the second shut-off valve 18, the
Four shut-off valves 20, control pneumatic operated valve 6 are opened, and first throttle valve 4, second throttle 5 are adjusted, to continue simultaneously to core holding unit
The pressure that 21 arrival end is passed through constant-pressure stable is P11Gas (P11Measured by first pressure sensor 14), it is clamped to rock core
The pressure that the outlet end of device 21 is passed through constant-pressure stable is P21Gas (P21Measured by second pressure sensor 15), control host
11 automatically record the pressure of the arrival end for the rock core fastener 21 that first pressure sensor 14 measures, second pressure sensor 15 is surveyed
The stream of flow, the acquisition of second flowmeter 13 that the pressure and first flowmeter 12 of the outlet end of the rock core fastener 21 obtained acquire
Amount, is calculated post-fracturing drill core permeability rate K using level pressure steady state method formula (3)1:
In formula, A is core area of section, and L is the length of core, and μ is gas viscosity, and Q is the gas flow by core
(i.e. the flow of the acquisition of second flowmeter 13), A, L, μ are known parameters.
S8, first throttle valve 4, second throttle 5, pneumatic operated valve 6, solenoid valve 7, the cut-off of the first shut-off valve 17, second are closed
Valve 18, third shut-off valve 19, the 4th shut-off valve 20, overflow valve 25 take out core 26, close experimental provision power supply, carry out safety
Experiment is completed after inspection.
Claims (7)
1. a kind of supercritical carbon dioxide pulse fracturing and the test integrated experimental provision of permeability, it is characterised in that: including
First gas source (1), the second gas source (2), carbon dioxide air source (3), first throttle valve (4), second throttle (5), pneumatic operated valve
(6), solenoid valve (7), air compressor machine (8), the time relay (9), conversion module (10), the control host with data acquisition function
(11), first flowmeter (12), second flowmeter (13), first pressure sensor (14), second pressure sensor (15), temperature
Sensor (16), the first shut-off valve (17), the second shut-off valve (18), third shut-off valve (19), the 4th shut-off valve (20), gas return
Closed cans (24) and in situ environment simulation system, the in situ environment simulation system include rock core fastener (21), temperature control
Body (22) and axis confining pressure load terminal (23), rock core fastener (21), temperature sensor (16) are mounted on temperature control body
(22) in, axis confining pressure load terminal (23) is connected to by pipeline with rock core fastener (21)；First gas source (1) passes through the first cut-off
The arrival end of valve (17), steel pipe and first throttle valve (4) connects, and carbon dioxide air source (3) passes through third shut-off valve (19), steel pipe
It is connect with the arrival end of first throttle valve (4), the outlet end of first throttle valve (4), pneumatic operated valve (6), first flowmeter (12), rock
The arrival end of core holder (21) is sequentially connected by steel pipe, the outlet end of rock core fastener (21), second flowmeter (13),
Four shut-off valves (20), gas recycling can (24) are sequentially connected by steel pipe, and the second gas source (2) passes through the second shut-off valve (18), steel
Pipe is connect with the arrival end of second throttle (5), and the outlet end of second throttle (5) is connected to second flowmeter by steel pipe
(13) between the 4th shut-off valve (20)；The control terminal of pneumatic operated valve (6) is connect by pipeline, solenoid valve (7) with air compressor machine (8),
The control terminal of solenoid valve (7) is electrically connected by signal wire with the time relay (9), and the time relay (9) passes through signal wire, conversion
Module (10) is electrically connected with the control host (11), and first pressure sensor (14) is by piping connection in first flowmeter
(12) between the arrival end of rock core fastener (21), second pressure sensor (15) is by piping connection in rock core fastener
(21) first pressure sensor (14), second pressure sensor (15), first-class between outlet end and second flowmeter (13)
Meter (12), second flowmeter (13), temperature sensor (16) are all electrically connected with control host (11) by signal wire respectively.
2. supercritical carbon dioxide pulse fracturing according to claim 1 and the test integrated experimental provision of permeability,
It is characterized by: by the outlet end of first throttle valve (4), pneumatic operated valve (6), first flowmeter (12), rock core fastener (21)
The outer wall of the sequentially connected steel pipe of arrival end is provided with heating mantle.
3. supercritical carbon dioxide pulse fracturing according to claim 1 or 2 is filled with the test integrated experiment of permeability
It sets, it is characterised in that: be connected with overflow valve (25) on the steel pipe between the 4th shut-off valve (20) and gas recycling can (24).
4. supercritical carbon dioxide pulse fracturing according to claim 1 or 2 or 3 and the test integrated experiment of permeability
Device, it is characterised in that: first gas source (1), the second gas source (2) are all methane gas source or helium gas source.
5. a kind of supercritical carbon dioxide pulse fracturing and the test integrated experimental method of permeability, using such as claim 1
To 4 any experimental provisions, which comprises the steps of:
S1, under conditions of the experimental provision meets leakproofness, the core sample made is closed with gum cover to be put into
It states in rock core fastener (21), oil pressure is injected in axis confining pressure load terminal (23) into rock core fastener, and core (26) is made to be in real
It tests in the axis pressure and confining pressure environment of requirement；
S2, third shut-off valve (19) are closed, opens the first shut-off valve (17), the second shut-off valve (18), the 4th shut-off valve (20), control
Pneumatic operated valve (6) processed is opened, and first throttle valve (4), second throttle (5) are adjusted, simultaneously to the entrance of core holding unit (21)
Being passed through pressure is P10Gas, to the outlet of core holding unit (21) be passed through pressure be P20Gas, P20< P10, form one
Pressure pulse is then shut off the first shut-off valve (17), the second shut-off valve (18)；
S3, control host (11) automatically record the pressure of the arrival end for the rock core fastener (21) that first pressure sensor (14) measures
The pressure of the outlet end for the rock core fastener (21) that power, second pressure sensor (15) measure forms pressure history, to rock
After the pressure of the arrival end of core holder (21) and the pressure of its outlet end are stablized, rock is calculated using pulse attenuation method formula
Core original permeability K0；
S4, the temperature that temperature control body (22) are arranged can guarantee carbon dioxide to preset temperature, the experiment preset temperature is tested
Medium can become supercritical carbon dioxide after entering core；
S5, the pulse fracturing Digital Control software controlled in host (11) is opened, waveform, the frequency, vibration of pulsed flow is set
Width parameter；
S6, the first shut-off valve (17), the second shut-off valve (18) are closed, opens third shut-off valve (19), the 4th shut-off valve (20), adjusted
It saves first throttle valve (4), the pulse signal control that control host (11) is converted by conversion module (10), the time relay (9)
Solenoid valve (7), and then pneumatic operated valve (6) are controlled, so that CO 2 medium is formed pulsed flow and enter inside core, becomes overcritical
Carbon dioxide generates pulse fracturing to core；
S7, after the completion of pulse fracturing, close third shut-off valve (19), open the first shut-off valve (17), the second shut-off valve (18),
4th shut-off valve (20), control pneumatic operated valve (6) open, adjust first throttle valve (4), second throttle (5), with simultaneously continue to
The pressure that the arrival end of core holding unit (21) is passed through constant-pressure stable is P11Gas, it is logical to the outlet end of core holding unit (21)
The pressure for entering constant-pressure stable is P21Gas, control host (11) automatically records the core folder that first pressure sensor (14) measures
The pressure of the outlet end for the rock core fastener (21) that the pressure of the arrival end of holder (21), second pressure sensor (15) measure and
The flow of first, second flowmeter (12,13) acquisition, is calculated post-fracturing drill core permeability rate using level pressure steady state method formula
K1。
6. supercritical carbon dioxide pulse fracturing according to claim 5 and the test integrated experimental method of permeability,
It is characterized by: core original permeability K in the step S30It is calculated by formula (1), formula (2):
In formula, P1For the steady pressure of the arrival end of rock core fastener (21) after the t time, P2For after the t time core press from both sides
The steady pressure of the outlet end of holder (21), A are core area of section, and L is the length of core, and μ is gas viscosity, and β is gas
The compressed coefficient, V1The gas volume in steel pipe between the arrival end of the first shut-off valve (17) to rock core fastener (21), V2For
The outlet end of rock core fastener (21) is to the gas volume in the steel pipe between the second shut-off valve (18), A, L, μ, β, V1、V2All it is
Known parameters.
7. supercritical carbon dioxide pulse fracturing according to claim 5 and the test integrated experimental method of permeability,
It is characterized by: post-fracturing drill core permeability rate K in the step S71Calculation formula are as follows:
In formula, A is core area of section, and L is the length of core, and μ is gas viscosity, and Q is the gas flow by core, A, L,
μ is known parameters.
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