CN109975140B - 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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- 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
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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
- G01N3/30—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
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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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
- G01N2203/0067—Fracture or rupture
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 invention relates to the field of unconventional natural gas development experiments, in particular to an experimental device and method integrating supercritical carbon dioxide pulse fracturing and permeability testing.
Background
China is in the key period of energy demand increase and energy structure adjustment change, and the country greatly advocates the development and utilization of unconventional natural gas to relieve the pressure of insufficient supply of conventional oil gas and promote the sustainable and healthy development of the economic society of China. However, the permeability of rock reservoirs of unconventional natural gas (such as coal bed gas, shale gas and the like) is very low, and the method for increasing the permeability of reservoirs is mainly a hydraulic fracturing technology, but the following problems exist when the permeability of an ultra-low permeability reservoir is increased by adopting the hydraulic fracturing technology: (1) the ground stress difference of a deep rock reservoir is larger and larger, the control effect of the high ground stress difference on the hydraulic pressure fracture is stronger and stronger, a single main fracture is easy to appear, and the modification effect on the reservoir is not ideal; (2) the fracturing fluid commonly used in the hydraulic fracturing technology contains various chemical reagents, and the fracturing fluid is easy to generate water sensitivity and water lock effects with a reservoir stratum, so that the fracturing fluid reduces methane flow channels while damaging the stratum, and the recovery ratio is low; (3) a large amount of fracturing fluid is injected into the stratum to possibly induce secondary disasters such as earthquake; (4) in most hydraulic fracturing experiments, a core sample is taken out after fracturing, and then permeability is measured, so that the core sample can release stress, and therefore, a permeability test result is different from a real situation.
Disclosure of Invention
The invention aims to provide an experimental device and method integrating supercritical carbon dioxide pulse fracturing and permeability testing, so as to realize a supercritical carbon dioxide pulse fracturing low-permeability reservoir experiment under a simulation multi-field coupling condition and simultaneously test the permeability of a rock core before and after fracturing in situ.
The invention relates to an experimental device integrating supercritical carbon dioxide pulse fracturing and permeability testing, which comprises a first gas source, a second gas source, a carbon dioxide gas source, a first throttle valve, a second throttle valve, a pneumatic valve, an electromagnetic 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 holder, a temperature control cavity and a shaft confining pressure loading terminal, the rock core holder and the temperature sensor are arranged in the temperature control cavity, the temperature control cavity is used for providing the temperature required by the experiment, and the temperature sensor is used for measuring the temperature in the temperature control cavity, the shaft confining pressure loading terminal is communicated with the core holder through a pipeline, and oil pressure is injected into the core holder by the shaft confining pressure loading terminal, so that a core in the core holder is in an axial pressure and confining pressure environment required by an experiment; the first gas source is connected with the inlet end of the first throttle valve through a first stop valve and a steel pipe, the carbon dioxide gas source is connected with the inlet end of the first throttle valve through a third stop valve and the steel pipe, the outlet end of the first throttle valve, the pneumatic valve, the first flowmeter and the inlet end of the core holder are sequentially connected through the steel pipe, the outlet end of the core holder, the second flowmeter, the fourth stop valve and the gas recovery tank are sequentially connected through the steel pipe, the second gas source is connected with the inlet end of the second throttle valve through the second stop valve and the steel pipe, and the outlet end of the second throttle valve is connected between the second flowmeter and the fourth stop valve through the steel pipe; the control end of the pneumatic valve is connected with the air compressor through a pipeline and an electromagnetic valve, the control end of the electromagnetic valve is electrically connected with a time relay through a signal line, the time relay is electrically connected with the control host through a signal line and a conversion module, a first pressure sensor is connected between the first flowmeter and the inlet end of the core holder through a pipeline and used for measuring the gas pressure at the inlet end of the core holder, a second pressure sensor is connected between the outlet end of the core holder and a second flowmeter through a pipeline and used for measuring the gas pressure at the outlet end of the core holder, and the first pressure sensor, the second pressure sensor, the first flowmeter, the second flowmeter and the temperature sensor are all electrically connected with the control host through signal lines.
Preferably, the outer wall of the steel pipe that the exit end with first choke valve, pneumatic valve, first flowmeter, entry end of core holder connect gradually is provided with the heating jacket, utilizes the heating jacket to carry out certain degree of preheating to the carbon dioxide medium, can be better guarantee that the carbon dioxide medium can be faster become supercritical carbon dioxide after getting into the core.
Preferably, an overflow valve is connected to a steel pipe between the fourth stop valve and the gas recovery tank, and the overflow valve can simulate the filtration effect of a shaft in the rock core during fracturing.
Preferably, the first gas source and the second gas source are both methane gas sources or helium gas sources.
The invention relates to an experimental method for integrating supercritical carbon dioxide pulse fracturing and permeability testing, which adopts the experimental device and comprises the following steps:
s1, under the condition that the experimental device meets the sealing property, the manufactured rock core sample is sealed by a rubber sleeve and is placed into the rock core holder, and an axial confining pressure loading terminal injects oil pressure into the rock core holder to enable the rock core to be in the axial pressure and confining pressure environment required by the experiment;
s2, closing the third stop valve, opening the first stop valve, the second stop valve and the fourth stop valve, controlling the pneumatic valve to be opened, and adjusting the first throttle valve and the second throttle valve to simultaneously introduce pressure P to the inlet of the rock core holder10Gas (P) of10Measured by a first pressure sensor) and a pressure P is introduced into the outlet of the core holder20Gas (P) of20Measured by a second pressure sensor), P)20＜P10Forming a pressure pulse, and then closing the first stop valve and the second stop valve;
s3, the control host automatically records the pressure of the inlet end of the core holder measured by the first pressure sensor and the pressure of the outlet end of the core holder measured by the second pressure sensor to form a pressure change curve, and after the pressure of the inlet end of the core holder and the pressure of the outlet end of the core holder are stable, the original permeability K of the core is calculated by adopting a pulse attenuation formula0；
S4, setting the temperature of the temperature control cavity to an experimental preset temperature which can ensure that the carbon dioxide medium can become supercritical carbon dioxide after entering the rock core;
s5, opening pulse fracturing digital control software in the control host, and setting waveform, frequency and amplitude parameters of the pulse fluid;
s6, closing the first stop valve and the second stop valve, opening the third stop valve and the fourth stop valve, adjusting the first throttle valve, controlling the electromagnetic valve by the control host machine through the pulse signals converted by the conversion module and the time relay, further controlling the pneumatic valve, enabling the carbon dioxide medium to form pulse fluid to enter the rock core to become supercritical carbon dioxide, and generating pulse fracturing on the rock core;
s7, after the pulse fracturing is finished, closing the third stop valve, opening the first stop valve, the second stop valve and the fourth stop valve, controlling the pneumatic valve to be opened, and adjusting the first throttle valve and the second throttle valve to continuously introduce constant pressure to the inlet end of the rock core holder at the same timeA stable pressure of P11Gas (P) of11Measured by a first pressure sensor), introducing a constant pressure P to the outlet end of the rock core holder, wherein the pressure P is stable21Gas (P) of21Measured by a second pressure sensor), the control host automatically records the pressure at the inlet end of the core holder measured by the first pressure sensor, the pressure at the outlet end of the core holder measured by the second pressure sensor and the flow collected by the first and second flow meters, and calculates the permeability K of the fractured core by adopting a constant pressure steady state method formula1。
The original permeability K of the core in the step S30The formula (1) and the formula (2) (namely the formula of the pulse attenuation method) are used for calculating:
in the formula, P1For the steady pressure at the inlet end of the core holder after t time, P2For the stable pressure at the outlet end of the core holder after t time, A is the core cross-sectional area, L is the core length, μ is the gas viscosity, β is the gas compressibility, V1Is the volume of gas in the steel tube between the first shut-off valve and the inlet end of the core holder, V2A, L, mu, beta, V, gas volume in the steel tube between the outlet end of the core holder and the second shut-off valve1、V2Are all known parameters.
The permeability K of the rock core after fracturing in the step S71The calculation formula of (2) is as follows:
where A is the core cross-sectional area, L is the core length, μ is the gas viscosity, Q is the gas flow rate through the core (i.e., the flow rate collected by the second flowmeter), and A, L, μ are both known parameters.
The invention realizes the experiment of simulating the supercritical carbon dioxide pulse fracturing low-permeability reservoir under the condition of multi-field coupling (temperature field and pressure field), realizes the digital software control of pulse waveform, frequency and amplitude, can test the rock core permeability before and after fracturing in situ, has the advantages of intellectualization, convenient operation and the like compared with the traditional experiment method and experiment equipment, and simulates the field working condition more vividly through the in situ environment simulation system, thereby ensuring that the measurement result is more real and accurate.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The supercritical carbon dioxide pulse fracturing and permeability testing integrated experimental device shown in fig. 1 comprises a first gas source 1, a second gas source 2, a carbon dioxide gas source 3, a first throttle valve 4, a second throttle valve 5, a pneumatic valve 6, an electromagnetic valve 7, an air compressor 8, a time relay 9, a conversion module 10, a control host 11 with a data acquisition function, a first flowmeter 12, a second flowmeter 13, a first pressure sensor 14, a second pressure sensor 15, a temperature sensor 16, a first stop valve 17, a second stop valve 18, a third stop valve 19, a fourth stop valve 20, an overflow valve 25, a gas recovery tank 24 and an in-situ environment simulation system, wherein the first gas source 1 and the second gas source 2 are both methane gas sources (or helium gas sources); the in-situ environment simulation system comprises a core holder 21 (the specific structure of the core holder 21 is described in CN 206410979U), a temperature control cavity 22 and an axial confining pressure loading terminal 23, wherein the core holder 21 and the temperature sensor 16 are installed in the temperature control cavity 22, the axial confining pressure loading terminal 23 is communicated with the core holder 21 through a pipeline, and the temperature control cavity 22 can provide the temperature between room temperature and 200 ℃; the first gas source 1 is connected with the inlet end of the first throttling valve 4 through a first stop valve 17 and a steel pipe, the carbon dioxide gas source 3 is connected with the inlet end of the first throttling valve 4 through a third stop valve 19 and the steel pipe, the outlet end of the first throttling valve 4, the pneumatic valve 6, the first flowmeter 12 and the inlet end of the core holder 21 are sequentially connected through the steel pipe of which the outer wall is provided with a heating jacket, the outlet end of the core holder 21, the second flowmeter 13, the fourth stop valve 20, the overflow valve 25 and the gas recovery tank 24 are sequentially connected through the steel pipe, the second gas source 2 is connected with the inlet end of the second throttling valve 5 through a second stop valve 18 and the steel pipe, and the outlet end of the second throttling valve 5 is connected between the second flowmeter 13 and the fourth stop valve 20 through the steel pipe; the control end of the pneumatic valve 6 is connected with the air compressor 8 through a pipeline, the electromagnetic valve 7 is connected with the air compressor 8, the control end of the electromagnetic valve 7 is electrically connected with the time relay 9 through a signal line, the time relay 9 is connected with the control host 11 through a signal line, the conversion module 10 is electrically connected with the control host 11, the first pressure sensor 14 is connected between the inlet end of the first flowmeter 12 and the inlet end of the core clamper 21 through a pipeline, the second pressure sensor 15 is connected between the outlet end of the core clamper 21 and the second flowmeter 13 through a pipeline, and the first pressure sensor 14, the second pressure sensor 15, the first flowmeter 12, the second flowmeter 13 and the temperature sensor 16 are all electrically connected with the control host 11 through signal lines respectively.
The experimental method for carrying out the integration of the supercritical carbon dioxide pulse fracturing and permeability test by adopting the experimental device comprises the following steps:
s1, under the condition that the experimental device meets the tightness, the manufactured rock core (sample) is sealed by a rubber sleeve and placed into the rock core holder 21, and the shaft confining pressure loading terminal 23 injects oil pressure into the rock core holder 21 to enable the rock core 26 to be in the shaft pressure and confining pressure environment required by the experiment and simulate the ground stress.
S2, closing the third stop valve 19, opening the first stop valve 17, the second stop valve 18 and the fourth stop valve 20, controlling the pneumatic valve 6 to be opened, adjusting the first throttle valve 4 and the second throttle valve 5 to simultaneously feed pressure P to the inlet of the core holder 2110Gas (P) of10Measured by the first pressure sensor 14), a pressure P is introduced into the outlet of the core holder 2120Gas (P) of20Measured by the second pressure sensor 15), P)20＜P10A pressure pulse is formed and then the first stop valve 17 and the second stop valve are closed18。
S3, the control host machine 11 automatically records the pressure at the inlet end of the core holder 21 measured by the first pressure sensor 14 and the pressure at the outlet end of the core holder 21 measured by the second pressure sensor 15 to form a pressure change curve, and after the pressure at the inlet end of the core holder 21 and the pressure at the outlet end of the core holder are stable, the original permeability K of the core is calculated by using a formula (1) and a formula (2) (namely a pulse attenuation formula)0：
In the formula, P1For the steady pressure at the inlet end of the core holder after t time, P2For the stable pressure at the outlet end of the core holder after t time, A is the core cross-sectional area, L is the core length, μ is the gas viscosity, β is the gas compressibility, V1Is the volume of gas in the steel tube between the first shut-off valve and the inlet end of the core holder, V2A, L, mu, beta, V, gas volume in the steel tube between the outlet end of the core holder and the second shut-off valve1、V2Are all known parameters.
S4, setting the temperature of the temperature control cavity 22 to a preset temperature (monitoring the temperature in real time by the control host 11), and preheating the wrapped steel pipe by using the heating jacket to ensure that the carbon dioxide medium can become supercritical carbon dioxide after entering the rock core 26.
S5, opening the pulse fracturing digital control software (existing software) in the control host 11, and setting the waveform, frequency and amplitude parameters of the pulse fluid.
S6, closing the first stop valve 17 and the second stop valve 18, opening the third stop valve 19 and the fourth stop valve 20, adjusting the first throttle valve 4, adjusting the overflow valve 25 to simulate the filtration of a shaft in the rock core during fracturing, controlling the electromagnetic valve 7 by the control host 11 through the pulse signals converted by the conversion module 10 and the time relay 9, further controlling the pneumatic valve 6, enabling the carbon dioxide medium to form pulse fluid to enter the rock core 26 to become supercritical carbon dioxide, and generating pulse fracturing on the rock core 26.
S7, after the pulse fracturing is finished, closing the third stop valve 19, opening the first stop valve 17, the second stop valve 18 and the fourth stop valve 20, controlling the pneumatic valve 6 to be opened, and adjusting the first throttle valve 4 and the second throttle valve 5 to continuously feed constant-pressure stable pressure P to the inlet end of the core holder 21 at the same time11Gas (P) of11Measured by the first pressure sensor 14), a constant pressure is introduced into the outlet end of the core holder 21, and the pressure is P21Gas (P) of21Measured by the second pressure sensor 15), the control host 11 automatically records the pressure at the inlet end of the core holder 21 measured by the first pressure sensor 14, the pressure at the outlet end of the core holder 21 measured by the second pressure sensor 15, the flow rate collected by the first flowmeter 12 and the flow rate collected by the second flowmeter 13, and calculates the permeability K of the fractured core by adopting a constant pressure steady state method formula (3)1：
Where a is the core cross-sectional area, L is the core length, μ is the gas viscosity, Q is the gas flow rate through the core (i.e., the flow rate collected by the second flowmeter 13), and A, L, μ are known parameters.
S8, closing the first throttle valve 4, the second throttle valve 5, the pneumatic valve 6, the electromagnetic valve 7, the first stop valve 17, the second stop valve 18, the third stop valve 19, the fourth stop valve 20 and the overflow valve 25, taking out the rock core 26, closing the power supply of the experimental device, and completing the experiment after safety inspection.
Claims (5)
1. The utility model provides an experimental apparatus of supercritical carbon dioxide pulse fracturing and permeability test integration which characterized in that: comprises a first gas source (1), a second gas source (2), a carbon dioxide gas source (3), a first throttle valve (4), a second throttle valve (5), a pneumatic valve (6), an electromagnetic valve (7), an air compressor (8), a time relay (9), a conversion module (10), a control host (11) with a data acquisition function, a first flowmeter (12), a second flowmeter (13), a first pressure sensor (14), a second pressure sensor (15), a temperature sensor (16), a first stop valve (17), a second stop valve (18), a third stop valve (19), a fourth stop valve (20), a gas recovery tank (24) and an in-situ environment simulation system, wherein the in-situ environment simulation system comprises a rock core clamper (21), a temperature control cavity (22) and a shaft confining pressure loading terminal (23), the rock core clamper (21) and the temperature sensor (16) are installed in the temperature control cavity (22), the shaft confining pressure loading terminal (23) is communicated with the core holder (21) through a pipeline; the first gas source (1) is connected with the inlet end of the first throttle valve (4) through a first stop valve (17) and a steel pipe, the carbon dioxide gas source (3) is connected with the inlet end of the first throttle valve (4) through a third stop valve (19) and a steel pipe, the outlet end of the first throttle valve (4), the pneumatic valve (6), the first flowmeter (12) and the inlet end of the core holder (21) are sequentially connected through the steel pipe, a heating sleeve is arranged on the outer wall of the steel pipe, the outlet end of the core holder (21), the second flowmeter (13), the fourth stop valve (20) and the gas recovery tank (24) are sequentially connected through the steel pipe, an overflow valve (25) is connected to the steel pipe between the fourth stop valve (20) and the gas recovery tank (24), the second gas source (2) is connected with the inlet end of the second throttle valve (5) through a second stop valve (18) and the steel pipe, the outlet end of the second throttle valve (5) is connected with the second flowmeter (13) and the fourth stop valve (13) through the steel pipe 20) To (c) to (d); the control end of pneumatic valve (6) is connected with air compressor machine (8) through pipeline, solenoid valve (7), and the control end of solenoid valve (7) is connected through signal line and time relay (9) electricity, time relay (9) passing signal line, conversion module (10) with main control system (11) electricity is connected, and first pressure sensor (14) pass through the tube coupling between the entry end of first flowmeter (12) and core holder (21), and second pressure sensor (15) pass through the tube coupling between the exit end of core holder (21) and second flowmeter (13), and first pressure sensor (14), second pressure sensor (15), first flowmeter (12), second flowmeter (13), temperature sensor (16) all are connected with main control system (11) electricity respectively through the signal line.
2. The supercritical carbon dioxide pulse fracturing and permeability testing integrated experimental device according to claim 1, characterized in that: the first gas source (1) and the second gas source (2) are both methane gas sources or helium gas sources.
3. An experimental method for integrating supercritical carbon dioxide pulse fracturing and permeability testing, which adopts the experimental device as claimed in claim 1 or 2, and is characterized by comprising the following steps:
s1, under the condition that the experimental device meets the sealing property, the prepared core sample is sealed by a rubber sleeve and is placed into the core holder (21), and the oil pressure is injected into the core holder by the axial confining pressure loading terminal (23) so that the core (26) is in the axial pressure and confining pressure environment required by the experiment;
s2, closing the third stop valve (19), opening the first stop valve (17), the second stop valve (18) and the fourth stop valve (20), controlling the pneumatic valve (6) to be opened, and adjusting the first throttle valve (4) and the second throttle valve (5) to simultaneously introduce pressure P to the inlet of the core holder (21)10The pressure of the gas is P to the outlet of the core holder (21)20Of gas, P20＜P10Forming a pressure pulse and then closing the first stop valve (17) and the second stop valve (18);
s3, the control host (11) automatically records the pressure of the inlet end of the core holder (21) measured by the first pressure sensor (14) and the pressure of the outlet end of the core holder (21) measured by the second pressure sensor (15) to form a pressure change curve, and after the pressure of the inlet end of the core holder (21) and the pressure of the outlet end of the core holder are stable, the original permeability K of the core is calculated by adopting a pulse attenuation formula0；
S4, setting the temperature of the temperature control cavity (22) to an experimental preset temperature which can ensure that the carbon dioxide medium can become supercritical carbon dioxide after entering the rock core;
s5, opening pulse fracturing digital control software in the control host (11), and setting waveform, frequency and amplitude parameters of the pulse fluid;
s6, closing the first stop valve (17) and the second stop valve (18), opening the third stop valve (19) and the fourth stop valve (20), adjusting the first throttle valve (4), controlling the electromagnetic valve (7) by the control host (11) through the pulse signals converted by the conversion module (10) and the time relay (9), further controlling the pneumatic valve (6), enabling the carbon dioxide medium to form pulse fluid to enter the rock core to become supercritical carbon dioxide, and generating pulse fracturing on the rock core;
s7, after the pulse fracturing is finished, closing the third stop valve (19), opening the first stop valve (17), the second stop valve (18) and the fourth stop valve (20), controlling the pneumatic valve (6) to be opened, and adjusting the first throttle valve (4) and the second throttle valve (5) to continuously introduce constant-pressure stable pressure P to the inlet end of the rock core holder (21) at the same time11The gas is introduced into the outlet end of the rock core holder (21) at a constant pressure and a stable pressure P21The control host (11) automatically records the pressure of the inlet end of the core holder (21) measured by the first pressure sensor (14), the pressure of the outlet end of the core holder (21) measured by the second pressure sensor (15) and the flow rates collected by the first flow meter and the second flow meter (12 and 13), and calculates the permeability K of the fractured core by adopting a constant pressure steady state method formula1。
4. The supercritical carbon dioxide pulse fracturing and permeability testing integrated experimental method according to claim 3, characterized in that: the original permeability K of the core in the step S30The calculation is obtained through formula (1) and formula (2):
in the formula, P1For the steady pressure at the inlet end of the core holder (21) after t time, P2Is passing throughthe steady pressure at the outlet end of the core holder (21) after time t, A being the core cross-sectional area, L being the core length, μ being the gas viscosity, β being the gas compression coefficient, V1Is the volume of gas in the steel pipe between the first shut-off valve (17) and the inlet end of the core holder (21), V2A, L [ mu ], beta, V ] is the volume of gas in the steel tube between the outlet end of the core holder (21) and the second shut-off valve (18)1、V2Are all known parameters.
5. The supercritical carbon dioxide pulse fracturing and permeability testing integrated experimental method according to claim 3, characterized in that: the permeability K of the rock core after fracturing in the step S71The calculation formula of (2) is as follows:
wherein A is the cross-sectional area of the core, L is the length of the core, μ is the gas viscosity, Q is the gas flow rate through the core, and A, L and μ are known parameters.
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| CN103163057A (en) * | 2013-03-18 | 2013-06-19 | 河海大学 | Testing device and measuring and calculating method for gas permeability of compact rock material |
| CN103196762A (en) * | 2013-04-25 | 2013-07-10 | 重庆地质矿产研究院 | Experimental device and method for reforming shale gas reservoir through pulse hydraulic fracturing |
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