CN109236250A - A kind of supercritical CO2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and system - Google Patents
A kind of supercritical CO2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and system Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004088 simulation Methods 0.000 title claims abstract description 30
- 238000003306 harvesting Methods 0.000 title claims abstract description 22
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 104
- 238000012360 testing method Methods 0.000 claims abstract description 68
- 238000004458 analytical method Methods 0.000 claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 165
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 54
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 53
- 239000001569 carbon dioxide Substances 0.000 claims description 27
- 239000001307 helium Substances 0.000 claims description 23
- 229910052734 helium Inorganic materials 0.000 claims description 23
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 21
- 238000012544 monitoring process Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 9
- 238000002591 computed tomography Methods 0.000 claims description 6
- NNEUCPRHEGXIDG-UHFFFAOYSA-N helium;methane Chemical compound [He].C NNEUCPRHEGXIDG-UHFFFAOYSA-N 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 230000010429 evolutionary process Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 13
- 238000011084 recovery Methods 0.000 abstract description 4
- 229960004424 carbon dioxide Drugs 0.000 description 22
- 238000005070 sampling Methods 0.000 description 5
- 238000004868 gas analysis Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013401 experimental design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The present invention provides a kind of supercritical COs2Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, including sample heating, sample are fixed, the injection of airtight test, methane gas, supercritical CO2Pressure break coal petrography and displacement methane, test gas test and Sample Scan process.Invention also provides a kind of simulation experiment systems, including being equipped with thermostat, the sample room of three axis hydraulic devices and vacuum evacuation device, gas collecting device, gas composition analysis system, data acquisition analysis system and infrasound detection system.The present invention can simulate live pressure break coal seam and displacement methane process, realization supercritical CO2Injection pressure, charge velocity, injection rate realize temperature to critical CO the fracturing effect in coal seam and the influence of coal bed gas recovery ratio2The influence in coal seam is transformed, and then obtains the critical CO in specific coal seam2The best injection condition of pressure break.
Description
Technical field
The present invention relates to a kind of supercritical COs2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and system, belongs to
Deep Coalbed Methane exploits field.
Background technique
China's coal bed gas total resources is about 36.8 × 1012m3.In April, 2009, the Chinese government just establish fresh target, energetically
Develop substitute of the safe and environment-friendly coal bed gas as coal, clearly proposes to reinforce Coal Clean in 2015 government work reports
It efficiently utilizes, develops and uses shale gas, coal bed gas to replace the consumption of traditional coal resource.But from the point of view of current production technique,
The well yield of Coalbed Methane In China is lower, and well yield is average in 1000~1700m3/ d, and the U.S. it is average 3000~
6000m3/ d will promote the development of coal gas industry from now on, it is necessary to increase substantially well yield.The three of coal-bed gas exploitation are big
Core link is drilling well, pressure break (reservoir reconstruction) and mining, and wherein pressure break namely reservoir reconstruction refer to construction coal seam fracture and split
Gap is the key technique for increasing the gas permeability in coal seam.Currently, being mostly base to the hydraulic fracturing that coal bed gas straight well is taken
In the storey increase design experience of previous conventional Low permeable oil and gas reservoirs, not fully it is suitable for bed gas reservoir.In hydraulic fracturing, meeting
Biggish induced stress is generated around crack, and coal seam permeability is extremely sensitive to stress.Therefore, the exploitation of coal bed gas is compeled
Be essential the pressure break and displacement technology for wanting novel.
Supercritical CO2Pressure break is widely used to reservoir reconstruction as emerging fracturing technique.CO2Pressure break, which has, hurts reservoir
The easy glutinous technical advantage of the row of returning, phase transformation energization, dissolution drop after the small, pressure break of evil, has obtained quick development, has been widely used at present
The fracturing reform test of oily, gas production industry low permeability formation, especially at abroad, having obtained multiple application, effect is preferable.
In coal-bed gas exploitation field, supercritical CO2The technology of adopting (ECBM) is helped to obtain domestic and foreign scholars' highest attention coal bed gas, but right
In supercritical CO2It is also fewer that technical research is adopted to the pressure break increasing of coal petrography.Supercritical CO2It can be effectively transformed as green fracturing fluid
Coal seam enhances coal bed gas recovery ratio, therefore effectively applies supercritical CO2To the fracturing technique of coal petrography, for improving coal bed gas
Recovery ratio, protection groundwater environment are of great significance.
In consideration of it, in the built-in vertical simulation test in laboratory, analogue simulation deep fractures high temperature, high pressure, closed environment, research
Supercritical CO under different injection pressures, charge velocity, formation temperature conditions2Correctional effect and coal bed gas harvesting to coal petrography
The variation relation of rate can not only optimize injection well parameter, also have important directive significance to Practical Project.Therefore, it needs
Design a kind of supercritical CO2Pressure break coal petrography enhances the simulation experiment method of coal bed gas harvesting.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of supercritical COs2Pressure break coal petrography enhancing coal bed gas is adopted
Simulation experiment method and system are received, supercritical CO can be simulated2The fracturing reform of deep fractures is tested and to coal bed gas
Displacement experiment, and the data during test can be obtained in real time by various sensors, and analyze data, face super
Boundary CO2The fracturing process of coal petrography is organically blent with methane gas process is driven, is practiced closer in Practical Project.
The present invention is that technical solution used by solving its technical problem is: providing a kind of supercritical CO2Pressure break coal petrography
Enhance coal bed gas and harvest simulation experiment method, comprising the following steps:
(1) sample heats；Coal petrography sample is heated under the fixation of three axis hydraulic devices, guarantees that sample is heated evenly；
(2) sample is fixed；Will be fixed in the coal petrography sample merging sample room after heating, it will using the thermostat of sample room
The temperature of sample room is adjusted to test temperature, makes to keep test temperature in sample room, adjusts the indoor three axis hydraulic device of sample, right
Coal petrography sample is forced into test pressure to simulate confining pressure suffered by coal petrography；Sample room is closed, one group of infrasonic sensor is set respectively
In the every side in sample room, each infrasonic sensor is connect with monitored by infrasonic wave instrument respectively, last monitored by infrasonic wave instrument and data
Acquisition is connect with monitoring system；
(3) airtight test；Valve, detection system air-tightness, air-leakage test are closed after injecting helium into sample room
Pass through rear closing helium air intake valve and sample room air intake valve；Sample room is vacuumized, residual gas in removal system；
(4) methane gas injects；Methane gas is injected to sample room, injection period methane gas adds by heating device
Heat stops when injection pressure, which reaches setup pressure value, methane gas adsorption equilibrium and sample chamber pressure, to be stablized to sample
Methane gas is injected in room；
(5) supercritical CO2Pressure break coal petrography and displacement methane；
(a) pressure break: keeping heating device in the open state, to sample after the heated device of supercritical carbon dioxide is heated
The injection of product room, while the temperature of sample room, pressure, flow and sonic data are carried out in real time using data acquisition analysis system
The valve on sample room to gas composition analysis system pipeline is opened in monitoring；
(b) displacement: enter the methane gas displacement stage after the completion of the coal petrography pressure break stage；
(6) test gas is tested；Test gas in sample room enters gas collecting device by pipeline, utilizes gas group
Analysis system is divided to carry out test analysis to test gas component；
(7) Sample Scan；Gas composition analysis system testing is to CO2When content reaches 90% or more, stop carbon dioxide
Injection terminates test, closes heating device and thermostat, discharges sample room pressure, cools, discharge and release step by step
Sample triaxial pressure takes out coal petrography sample, and 3 faces of progress are successively scanned, and carries out fracturing effect analysis.
Step (1) is kept for 12 hours after coal petrography sample to be heated to test temperature under the fixation of three axis hydraulic devices.
Step (2) test temperature be 10~160 DEG C, test pressure be 0.1~30MPa, gas charge velocity be 0~
100ml/min。
When step (2) the closing sample room state, pressure change in 0.01MPa hereinafter, temperature change 0.2 DEG C with
It is interior.
Step (2) one group of infrasonic sensor includes 6 infrasonic sensors, before being respectively placed in sample room
Side, rear side, upside, downside, left and right side, respectively apart from 1~2m of coal petrography sample.
The helium, methane gas and CO2It is the high-purity gas that purity reaches 99.9%.
Step (5) coal petrography pressure break stage injects during supercritical carbon dioxide, and sample chamber pressure is in increasing state, directly
To abrupt pressure reduction, the coal petrography pressure break stage is completed, into the methane gas displacement stage；Or judge to press according to monitored by infrasonic wave data
It splits and completes moment and pressure break evolutionary process, adjust overcritical dioxy then into the methane gas displacement stage, and in the displacement stage
Change the rate or pressure of carbon injection sample room.
Step (7) scanning uses CT scan.
Invention also provides a kind of experimental system for simulating based on the simulation experiment method, including sample room, institutes
Sample room is stated equipped with thermostat and three axis hydraulic devices, helium gas source tank, methane gas carrying shield and carbon dioxide gas carrying shield difference
The air inlet pipe of sample room is accessed by heating device, exhaust pipe and the vacuum evacuation device and gas collecting device of sample room connect respectively
Logical, gas collecting device is connect with gas composition analysis system, and gas composition analysis system and data acquisition analysis system connect
It connects, the air inlet pipe and an air outlet pipe of sample room is respectively equipped with the Multiple Source Sensor connecting with data acquisition analysis system, sample room
It is inside disposed with one group of infrasonic sensor, infrasonic sensor is connect with infrasound detector, and infrasound detector is adopted with data
Collection is connect with monitoring system.
The helium gas source tank and methane gas carrying shield are connected to by helium methane gas booster pump with heating device, and described two
Carbonoxide gas source tank is connected to by carbon dioxide booster pump with heating device.
The present invention is based on beneficial effects possessed by its technical solution to be:
(1) a kind of supercritical CO provided by the invention2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and system
It focuses on and provides a kind of CO2During pressure break coal petrography in different moments coal petrography three-dimensional structure variation characteristic characteristic manner, simultaneously
Obtain CO under different operating conditions2Pressure break coal petrography effect and its relationship harvested with coal bed gas；
(2) a kind of supercritical CO provided by the invention2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and uses three
The method of axis pressurization (cube shaped) simulates deep level mining pressure condition (axially different pressure can not be identical), by coal petrography and high pressure
Reaction unit inner wall gapless is in close contact, and is directly pressurizeed to coal petrography, close to true environment；
(3) a kind of supercritical CO provided by the invention2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and system
It can directly persistently inject in coal and rock, CO2It is migrated from one end of coal petrography to the other end, the pressure in high-pressure reaction vessel is not
Break changed, and mainly due to CO2Injection caused by, whole process is the lasting mistake of a kind of dynamic pressure break and displacement
Journey；
(4) a kind of supercritical CO of offer provided by the invention2Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method
And system simulates hot environment using thermostat using three axis hydraulic system simulated high-pressure environment, can reach simulation deep
The effect of coal seam environment；It realizes that supercritical carbon dioxide injects coal petrography using gas booster pump, heating device, is acquired using data
With monitoring system monitoring test process；Monitored by infrasonic wave system can carry out real-time monitoring record to fracturing process infrasound data
With storage；Gas analysis system can carry out gas composition analysis in time, can finally be carried out to test specimen using CT scan
Comprehensive scanning accurately portrays pressure break situation；It can be by supercritical CO2To coal petrography transformation process be obviously divided into fracturing process with
Methane gas process is driven, targeted research can be carried out, can also be organically blent, convenient for instructing Practical Project to practice.
Detailed description of the invention
Fig. 1 is a kind of supercritical CO2Pressure break coal petrography enhances coal bed gas and harvests simulation experiment system schematic diagram.
Fig. 2 is sample room schematic diagram.
In figure: 1- helium gas source tank, 1-1- helium intake valve, 2- methane gas carrying shield, 2-1- methane intake valve, 3- titanium dioxide
Carbon gas source tank, 3-1- carbon dioxide valve, 4- helium methane gas booster pump, 4-1- helium methane pressure charging valve, 5- titanium dioxide
Carbon booster pump, 5-1- carbon dioxide pressure charging valve, 6- heating device, the sample room 6-1- intake valve, 6-2- first gas flowmeter, 6-
3- first pressure sensor, the first temperature sensor of 6-4-, the sample room 7-, 7-1- second pressure sensor, 7-2- second temperature
Sensor, 7-3- second gas flowmeter, the sample room 7-4- air outlet valve, 7-5- gas sampling system intake valve, 8- thermostat,
9- infrasound detection system, 9-1- infrasonic sensor, 9-2- infrasound detector, tri- axis hydraulic device of 10-, 11- test sample
Product, 12- vacuum evacuation device, 12-1- vacuumize air outlet valve, 13- gas collecting device, 13-1- gas analysis intake valve, 13-2-
Acquire gas release valve, 14- gas composition analysis system, 15- data acquisition analysis system, 16-CT instrument.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
The present invention provides a kind of supercritical COs2Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, including following
Step:
(1) sample heats；Coal petrography sample is heated under the fixation of three axis hydraulic devices, guarantees that sample is heated evenly；
(2) sample is fixed；Will be fixed in the coal petrography sample merging sample room after heating, it will using the thermostat of sample room
The temperature of sample room is adjusted to test temperature, makes to keep test temperature in sample room, adjusts the indoor three axis hydraulic device of sample, right
Coal petrography sample is forced into test pressure to simulate confining pressure suffered by coal petrography；Sample room is closed, one group of infrasonic sensor is set respectively
In the every side in sample room, each infrasonic sensor is connect with monitored by infrasonic wave instrument respectively, last monitored by infrasonic wave instrument and data
Acquisition is connect with monitoring system；
(3) airtight test；Valve, detection system air-tightness, air-leakage test are closed after injecting helium into sample room
Pass through rear closing helium air intake valve and sample room air intake valve；Sample room is vacuumized, residual gas in removal system；
(4) methane gas injects；Methane gas is injected to sample room, injection period methane gas adds by heating device
Heat stops when injection pressure, which reaches setup pressure value, methane gas adsorption equilibrium and sample chamber pressure, to be stablized to sample
Methane gas is injected in room；
(5) supercritical CO2Pressure break coal petrography and displacement methane；
(a) pressure break: keeping heating device in the open state, to sample after the heated device of supercritical carbon dioxide is heated
The injection of product room, while the temperature of sample room, pressure, flow and sonic data are carried out in real time using data acquisition analysis system
The valve on sample room to gas composition analysis system pipeline is opened in monitoring；
(b) displacement: enter the methane gas displacement stage after the completion of the coal petrography pressure break stage；
(6) test gas is tested；Test gas in sample room enters gas collecting device by pipeline, utilizes gas group
Analysis system is divided to carry out test analysis to test gas component；
(7) Sample Scan；Gas composition analysis system testing is to CO2When content reaches 90% or more, stop carbon dioxide
Injection terminates test, closes heating device and thermostat, discharges sample room pressure, cools, discharge and release step by step
Sample triaxial pressure takes out coal petrography sample, and 3 faces of progress are successively scanned, and carries out fracturing effect analysis.
Step (1) is kept for 12 hours after coal petrography sample to be heated to test temperature under the fixation of three axis hydraulic devices.
Step (2) test temperature be 10~160 DEG C, test pressure be 0.1~30MPa, gas charge velocity be 0~
100ml/min。
When step (2) the closing sample room state, pressure change in 0.01MPa hereinafter, temperature change 0.2 DEG C with
It is interior.
Step (2) one group of infrasonic sensor includes 6 infrasonic sensors, before being respectively placed in sample room
Side, rear side, upside, downside, left and right side, respectively apart from 1~2m of coal petrography sample.
The helium, methane gas and CO2It is the high-purity gas that purity reaches 99.9%.
Step (5) coal petrography pressure break stage injects during supercritical carbon dioxide, and sample chamber pressure is in increasing state, directly
To abrupt pressure reduction, the coal petrography pressure break stage is completed, into the methane gas displacement stage；Or judge to press according to monitored by infrasonic wave data
It splits and completes moment and pressure break evolutionary process, adjust overcritical dioxy then into the methane gas displacement stage, and in the displacement stage
Change the rate or pressure of carbon injection sample room.
Step (7) scanning uses CT scan.
Invention also provides a kind of experimental system for simulating based on the simulation experiment method, referring to Figures 1 and 2,
Including sample room 7, the sample room 7 is equipped with thermostat 8 and three axis hydraulic devices 10, helium gas source tank 1, methane gas carrying shield 2
Access the air inlet pipe of sample room 7 by heating device 6 respectively with carbon dioxide gas carrying shield 3, air inlet pipe is equipped with sample room air inlet
Valve 6-1, first gas flowmeter 6-2, first pressure sensor 6-3, the first temperature sensor 6-4.Helium gas source tank 1, methane
Gas source tank 2 and carbon dioxide gas carrying shield 3 are respectively equipped with helium intake valve 1-1, methane intake valve 2-1, carbon dioxide valve 3-
1, the exhaust pipe of sample room is equipped with second pressure sensor 7-1, second temperature sensor 7-2, second gas flowmeter 7-3 and sample
Product room air outlet valve 7-4, exhaust pipe and the vacuum evacuation device 12 and gas collecting device 13 of sample room are respectively communicated with, vacuum evacuation device
Gas sampling system intake valve 7-5 is equipped between 12 and gas collecting device 13, vacuum evacuation device 12 is equipped with and vacuumizes air outlet valve
12-1, gas collecting device 13 are equipped with gas analysis intake valve 13-1 and acquisition gas release valve 13-2, gas collecting device 13
It is connect with gas composition analysis system 14, gas composition analysis system 14 is connect with data acquisition analysis system 15, sample room 7
Air inlet pipe and an air outlet pipe be respectively equipped with the multi-source being made of above-mentioned each sensor connecting with data acquisition analysis system 15
Sensor is disposed with one group of infrasonic sensor 9-1, infrasonic sensor 9-1 and infrasound detector 9-2 company in sample room 7
It connects and constitutes infrasound detection system 9, infrasound detector 9-2 is connect with data acquisition analysis system 15.The helium gas source
Tank 1 and methane gas carrying shield 2 are connected to by helium methane gas booster pump 4 with heating device 6, and the carbon dioxide gas carrying shield 3 is logical
Carbon dioxide booster pump 5 is crossed to be connected to heating device 6.Helium methane gas booster pump 4 be equipped with helium methane pressure charging valve 4-1, two
Carbonoxide booster pump 5 is equipped with carbon dioxide pressure charging valve 5-1.
The detailed process tested using the experimental system for simulating are as follows:
(1) sample heats: test specimen 11 heats 12 hours under the fixation of three axis hydraulic devices 10 in test temperature,
It is heated evenly before guaranteeing sampling test.
(2) sample is fixed: after test specimen 11 heats, being put into thermostat 8 and is fixed, while adjusting the temperature to examination
Test temperature；Three axis hydraulic devices are adjusted simultaneously, are pressurizeed with the speed of 1MPa/min, and confining pressure suffered by simulation coal petrography is slowly forced into；
Sample room 7 is closed, according to each pipeline of Fig. 1 connection, each valve is in close state；Secondary monitoring system 9 is installed, infrasound is passed
Sensor 9-1 is respectively placed in the every side in sample room, and connect with monitored by infrasonic wave instrument 9-2, and last secondary monitoring system 9 is adopted with data
Collection is connect with monitoring system 15.
(3) airtight test: opening helium intake valve 1-1, sample room intake valve 6-1, closes sample room air outlet valve 7-4,
Inject high-purity helium into sample room 7, injection pressure is higher than experimental design pressure 1Mpa, closed after stablizing helium intake valve 1-1,
Sample room intake valve 6-1, detection system air-tightness；Step (3) repeats 2 times.
(4) methane injects: vacuumizing first, vacuum evacuation device 12 is opened, open sample room air outlet valve 7-4, vacuumize
Air outlet valve 12-1, other valves are in close state, and are vacuumized 12 hours, residual gas in removal system.Close vacuum means
12 are set, sample room air outlet valve 7-4 is closed, vacuumizes air outlet valve 12-1；Methane intake valve 2-1 is opened, heating device 6 is opened and is adjusted
To test temperature, helium methane gas booster pump 4 is opened, high-purity methane gas is slowly injected to sample room, until arriving injection pressure
Reach setup pressure value, make methane gas adsorption equilibrium, stablize to 7 pressure of sample room, closes booster pump 4 and other valves.
(5) pressure break and displacement: opening high-purity carbon dioxide intake valve 3-1, sample room intake valve 6-1, opens carbon dioxide
Booster pump 5 injects sample room 7 after requiring heated device 6 to heat according to experimental design carbon dioxide, opens sample room rapidly
Air outlet valve 7-4, gas sampling system intake valve 7-5 and gas analysis intake valve 13-1, log-on data monitoring and acquisition system 15,
To test process data (each sensor, three axis hydraulic devices 10, thermostat 8, monitored by infrasonic wave system 9 data) adopt
Collection and monitoring.
(6) test gas detects: opening gas sampling system 13, opens 14 (gas-chromatography of gas composition analysis system
Instrument), test analysis is carried out to test gas component.
(7) Sample Scan: CO is arrived in the test of gas composition analysis system 142Content reaches 90%, terminates test.Successively close
Each gas source valve, each booster pump, heating device, thermostat, slowly discharge, cooling, releasing test pipeline cool down, are cold for sample room
But.The sample 11 in sample room 7 is taken out, is put into CT instrument 16 and carries out CT scan, 3 faces of coal petrography sample are successively scanned, is carried out
Fracturing effect analysis.
10~160 DEG C of this test temperature range, 0.1~30MPa of test pressure, 0~50ml/min of gas charge velocity；This
Method requires system and pipeline sealing good, and when closed, system pressure variation should be within 0.01MPa, and temperature change exists
Within 0.2 DEG C；Sample Scan is not limited only to CT scan after the test, other scanning modes can be selected.
A kind of supercritical CO provided by the invention2Pressure break coal petrography enhances coal bed gas harvesting simulation experiment method and system can be with
Live pressure break coal seam and displacement methane process are simulated, can be realized research supercritical CO2Injection pressure, charge velocity, injection rate
The influence of fracturing effect and coal bed gas recovery ratio to coal seam, can be realized temperature to critical CO2The influence in coal seam is transformed, into
And obtain the critical CO in specific coal seam2The best injection condition of pressure break.
Claims (10)
1. a kind of supercritical CO2Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, it is characterised in that the following steps are included:
(1) sample heats；Coal petrography sample is heated under the fixation of three axis hydraulic devices, guarantees that sample is heated evenly；
(2) sample is fixed；Will be fixed in the coal petrography sample merging sample room after heating, using the thermostat of sample room by sample
The temperature of room is adjusted to test temperature, makes to keep test temperature in sample room, the indoor three axis hydraulic device of sample is adjusted, to coal petrography
Sample is forced into test pressure to simulate confining pressure suffered by coal petrography；Sample room is closed, one group of infrasonic sensor is respectively placed in sample
The every side in product room, each infrasonic sensor are connect with monitored by infrasonic wave instrument respectively, and last monitored by infrasonic wave instrument and data acquire
It is connect with monitoring system；
(3) airtight test；Valve, detection system air-tightness are closed after injecting helium into sample room, air-leakage test passes through
Helium air intake valve and sample room air intake valve are closed afterwards；Sample room is vacuumized, residual gas in removal system；
(4) methane gas injects；Methane gas is injected to sample room, injection period methane gas passes through heating devices heat, directly
When reaching setup pressure value, methane gas adsorption equilibrium and sample chamber pressure stabilization to injection pressure, stop infusing to sample room
Enter methane gas；
(5) supercritical CO2Pressure break coal petrography and displacement methane；
(a) pressure break: keeping heating device in the open state, to sample room after the heated device of supercritical carbon dioxide is heated
Injection, while the temperature of sample room, pressure, flow and sonic data are supervised in real time using data acquisition analysis system
The valve on sample room to gas composition analysis system pipeline is opened in control；
(b) displacement: enter the methane gas displacement stage after the completion of the coal petrography pressure break stage；
(6) test gas is tested；Test gas in sample room enters gas collecting device by pipeline, utilizes gas component point
Analysis system carries out test analysis to test gas component；
(7) Sample Scan；Gas composition analysis system testing is to CO2When content reaches 90% or more, stop carbon dioxide injection,
Terminate test, close heating device and thermostat, discharges sample room pressure, cool, discharge step by step and release sample
Triaxial pressure takes out coal petrography sample, and 3 faces of progress are successively scanned, and carries out fracturing effect analysis.
2. supercritical CO according to claim 12Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, and feature exists
It is kept for 12 hours after coal petrography sample is heated to test temperature by: step (1) under the fixation of three axis hydraulic devices.
3. supercritical CO according to claim 1 or 22Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, feature
Be: step (2) test temperature be 10~160 DEG C, test pressure be 0.1~30MPa, gas charge velocity be 0~
100ml/min。
4. supercritical CO according to claim 1 or 22Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, feature
Be: when step (2) the closing sample room state, pressure change is in 0.01MPa hereinafter, temperature change is within 0.2 DEG C.
5. supercritical CO according to claim 12Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, and feature exists
Include 6 infrasonic sensors in: step (2) one group of infrasonic sensor, be respectively placed in sample room front side, after
Side, upside, downside, left and right side, respectively apart from 1~2m of coal petrography sample.
6. supercritical CO according to claim 12Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, and feature exists
In: the helium, methane gas and CO2It is the high-purity gas that purity reaches 99.9%.
7. supercritical CO according to claim 12Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, and feature exists
In: during step (5) coal petrography pressure break stage injects supercritical carbon dioxide, sample chamber pressure is in increasing state, until pressure
Power bust, the coal petrography pressure break stage completes, into the methane gas displacement stage；Or judge that pressure break is complete according to monitored by infrasonic wave data
At moment and pressure break evolutionary process, supercritical carbon dioxide is adjusted then into the methane gas displacement stage, and in the displacement stage
Inject the rate or pressure of sample room.
8. supercritical CO according to claim 12Pressure break coal petrography enhances coal bed gas and harvests simulation experiment method, and feature exists
In: step (7) scanning uses CT scan.
9. a kind of experimental system for simulating based on simulation experiment method described in claim 1, it is characterised in that: including sample room,
The sample room is equipped with thermostat and three axis hydraulic devices, helium gas source tank, methane gas carrying shield and carbon dioxide gas carrying shield point
The air inlet pipe of sample room is not accessed by heating device, the exhaust pipe and vacuum evacuation device and gas collecting device of sample room are distinguished
Connection, gas collecting device are connect with gas composition analysis system, gas composition analysis system and data acquisition analysis system
Connection, the air inlet pipe and an air outlet pipe of sample room are respectively equipped with the Multiple Source Sensor connecting with data acquisition analysis system, sample
Interior is disposed with one group of infrasonic sensor, and infrasonic sensor is connect with infrasound detector, infrasound detector and data
Acquisition is connect with monitoring system.
10. experimental system for simulating according to claim 9, it is characterised in that: the helium gas source tank and methane gas carrying shield
It is connected to by helium methane gas booster pump with heating device, the carbon dioxide gas carrying shield is by carbon dioxide booster pump and adds
Thermal connection.
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