CN104502224A - Device and method for determination of coal rock isothermal desorption curve under saturated water condition - Google Patents
Device and method for determination of coal rock isothermal desorption curve under saturated water condition Download PDFInfo
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- CN104502224A CN104502224A CN201410403179.5A CN201410403179A CN104502224A CN 104502224 A CN104502224 A CN 104502224A CN 201410403179 A CN201410403179 A CN 201410403179A CN 104502224 A CN104502224 A CN 104502224A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000003245 coal Substances 0.000 title claims abstract description 62
- 239000011435 rock Substances 0.000 title claims abstract description 62
- 238000003795 desorption Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 230000018044 dehydration Effects 0.000 claims abstract description 25
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 25
- 238000002474 experimental method Methods 0.000 claims abstract description 18
- 239000003673 groundwater Substances 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 108
- 238000011049 filling Methods 0.000 claims description 22
- 239000011148 porous material Substances 0.000 claims description 20
- 230000009467 reduction Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 6
- 239000001307 helium Substances 0.000 claims description 6
- 229910052734 helium Inorganic materials 0.000 claims description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000002336 sorption--desorption measurement Methods 0.000 description 5
- 238000013475 authorization Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- -1 32b Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The invention discloses a device and method for determination of a coal rock isothermal desorption curve under saturated water condition. The device comprises a gas injection and vacuum pumping control subsystem, a water injection control subsystem, a true-triaxial rock core holding and control subsystem, and a dehydration metering subsystem. The gas injection pipe hole and water injection pipe hole of the true-triaxial rock core holding and control subsystem are respectively connected to the gas injection and vacuum pumping control subsystem and the water injection control subsystem, and the outlet end of the true-triaxial rock core holding and control subsystem is connected to the dehydration unit inlet end of the dehydration metering subsystem. The dehydration metering subsystem realizes respective metering of accumulative discharged gas and water mass. The method for determination of the coal rock isothermal desorption curve under saturated water condition is an experimental method carried out based on the device. Through true reappearance of the ground stress field, groundwater pressure field, temperature field and other underground environments where the coal rock is located, coal-seam gas desorption characteristic test is carried out, the device has a clear structure, the data acquisition is reliable, and the result is accurate and credible.
Description
Technical field
The invention belongs to petroleum engineering field, particularly, relate to a kind of saturation water Coal Under rock isothermal desorption curve determination device and method.
Background technology
Coal petrography reservoir is generally imbedded in underground deep, is among specific environmental baseline, is subject to the multi-scenarios method effects such as stress field, the ground water pressure field of force and Temperature Field.Cbm development is exactly change Occurrence of Coalbed Methane environmental baseline by specific engineering and development scheme thereof, thus the methane gas of adsorbing in coal seam is desorbed.In addition, in performance history, the injection of water is absolutely necessary, and injects water and can destroy the groundwater dynamics condition originally set up in coal seam, have an impact to coal-seam gas desorb, and therefore test should Approaching Coal Seam virtual condition as far as possible, considers water saturation situation.
By retrieval, the patent of invention of application number 201110130731.4 (Authorization Notice No. is CN102297829B) discloses measuring method and the device of coal petrography gas absorption amount and absorption distortion under a kind of stress condition, and the method can measure coal petrography gas absorption amount and absorption distortion under different stress condition; The patent of invention of application number 201110240836.5 (application publication number is CN102419295A) discloses a kind of loaded coal rock constant pressure gas adsorption-desorption pilot system and method, provides a kind of loaded coal rock constant pressure gas adsorption-desorption pilot system and the method that can carry out gas adsorption and desorption experiment to coal sample in different external load pressure and the pressure of different device in Gas; The patent of invention of application number 201210122353.X (application publication number is CN102636424A) discloses a kind of method measuring the coal petrography adsorbed gas scale of construction and permeability, provides a kind of method and apparatus retraining the lower Simultaneously test coal petrography adsorbed gas scale of construction of coal rock specimen annular strain and permeability; The patent of invention of application number 201210409446.0 (application publication number is CN102901803A) discloses a kind of stand under load coal containing methane gas aqueous vapor two-phase absorption-desorption-seepage flow experiment system and method, can realize the system and method for the adsorption and desorption experiment of stand under load coal containing methane gas under different solid and gas thermal coupling condition and the gas adsorption desorption experiment under gas porous flow experiment, the Seepage Experiment that also can realize aqueous vapor two-phase and different water cut condition; The patent of invention of application number 201310030953.8 (Authorization Notice No. is CN103115844B) discloses the assay method of a kind of danks isothermal adsorption/desorption curve, for measuring differently gas absorption/desorption quantity and the isothermal adsorption/desorption curve in danks under layer state truly such as stress, different temperatures.
At present, domestic existing coal petrography desorb analytical equipment differs larger with the design environment of method with coal petrography reservoir actual Environmental effect condition, truly cannot reflect the impact on coal seam gas desorb such as stress field, the ground water pressure field of force and temperature field, influence factor is considered comprehensive not, cause coal petrography desorption experiment data and rule and actual mining to there is relatively large deviation, thus cannot effectively instruct coal bed gas extraction to produce.
Summary of the invention
For overcoming the defect of existing experimental technique, the invention provides a kind of saturation water Coal Under rock isothermal desorption curve determination device and method, this experimental provision is simple to operate, method is easy to implement, can measure differently stress, different temperatures, saturated can circulating water Coal Under rock isothermal desorption curve, provide experiment basis for scientifically instructing the on-the-spot mining practice of coal-seam gas.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
Saturation water Coal Under rock isothermal desorption curve determination device, comprising: gas injection with vacuumize control subsystem, water filling control subsystem, true triaxial rock core clamp and control subsystem and the measuring subsystem that dewaters; Wherein: gas injection with vacuumize control subsystem and to be clamped by pipeline and true triaxial rock core and be connected with the gas injection pore of control subsystem, for the clamping of true triaxial rock core is with control subsystem gas injection with vacuumize; Water filling control subsystem is clamped by pipeline and true triaxial rock core and is connected with the water filling pore of control subsystem, for the clamping of true triaxial rock core applies saturated groundwater environment with control subsystem; The clamping of true triaxial rock core is connected with the dehydration plant inlet end that the endpiece of control subsystem is connected by pipeline the measuring subsystem that dewaters; The clamping of true triaxial rock core provides coal petrography standard specimen to clamp and residing stress field and temperature field environmental simulation with control subsystem; Dehydration measuring subsystem realizes true triaxial rock core and clamps the metering respectively adding up to discharge air water quality with control subsystem endpiece.
Relative to prior art, beneficial effect of the present invention is as follows:
1, the present invention is used for raw coal sample, and the design environment concentrated expression of the apparatus and method actual occurrence condition of coal petrography reservoir, on the impact of coal petrography isothermal desorption curve, can reproduce the underground environment residing for actual coal petrography gas desorption and desorption process truly;
2, the present invention truly can reflect the impact on coal seam gas desorb such as stress field, the ground water pressure field of force and temperature field, also can consider that groundwater quality or foreign liquid are on the impact of underground coal seam gas desorb, can carry out single-factor influence or various factors coupling impact test, the desorption curve measured can the desorption properties of Characterization of subsurface coal seam gas more truly;
3, apparatus of the present invention clear in structure, data processing consider coal petrography hole can circulating water on the impact of coal seam gas desorption properties, data acquisition is reliable, and result is accurately credible.
Accompanying drawing explanation
Fig. 1 is the structural representation of saturation water Coal Under rock isothermal desorption curve determination device;
In figure: 1, gas injection and vacuumize control subsystem; 2, water filling control subsystem; 3, the clamping of true triaxial rock core and control subsystem; 4, dewater measuring subsystem;
11, gas cylinder; 12, to give vent to anger valve; 13, reduction valve; 14, vacuum pump; 15, vacuum pump valve; 16, four-way; 17, inlet port pressure meter; 18, inlet end mass-flow gas meter; 19, air intake valve;
21, constant speed and constant pressure pump; 22, outlet pressures meter; 23, inlet triplet for water; 24, inlet valve;
31, true triaxial core holding unit; 32a, gas injection pore, 32b, water filling pore; 33, pressure transducer; 34, temperature sensor; 35, water bath with thermostatic control; 36, endpiece valve; 37, endpiece constant pressure valve; 38, pressure gauge; 39, endpiece threeway;
41, dehydration plant; 42, precision electronic balance; 43, mass-flow gas meter.
Embodiment
As shown in Figure 1, saturation water Coal Under rock isothermal desorption curve determination device, comprising: gas injection with vacuumize control subsystem 1, water filling control subsystem 2, true triaxial rock core clamp and control subsystem 3 and the measuring subsystem 4 that dewaters; Gas injection with vacuumize control subsystem 1 and to be clamped by pipeline and true triaxial rock core and be connected with the gas injection pore 32a of control subsystem 3, for the clamping of true triaxial rock core is with control subsystem 3 gas injection with vacuumize; Water filling control subsystem 2 is clamped by pipeline and true triaxial rock core and is connected with the water filling pore 32b of control subsystem 3, for the clamping of true triaxial rock core applies saturated groundwater environment with control subsystem 3; True triaxial rock core clamps dehydration plant 41 inlet end being connected the measuring subsystem 4 that dewaters with the endpiece of control subsystem 3 by pipeline; The clamping of true triaxial rock core provides coal petrography standard specimen to clamp and residing stress field and temperature field environmental simulation with control subsystem 3; Dehydration measuring subsystem 4 realizes true triaxial rock core and clamps the metering respectively adding up to discharge air water quality with control subsystem 3 endpiece.
Gas injection with vacuumize control subsystem 1, comprising: gas cylinder 11, valve 12 of giving vent to anger, reduction valve 13, vacuum pump 14, vacuum pump valve 15, four-way 16, inlet port pressure meter 17, inlet end mass-flow gas meter 18, air intake valve 19; Gas cylinder 11 is connected with reduction valve 13, and reduction valve 13 regulates from gas cylinder 11 gaseous tension out, and centre sets out air valve 12; Four interfaces of four-way 16 are connected with reduction valve 13, vacuum pump 14, inlet port pressure meter 17, air intake valve 19 respectively by pipeline; The pipeline that vacuum pump 14 is connected with four-way 16 is provided with vacuum pump valve 15, the pipeline that four-way 16 is connected with air valve 19 is provided with inlet end mass-flow gas meter 18, inlet port pressure meter 17 real-time monitored gas injection experiment line pressure, inlet end mass-flow gas meter 18 is measured the accumulative true triaxial rock core that injects and is clamped the gaseous mass with control subsystem 3.
Water filling control subsystem 2, comprising: constant speed and constant pressure pump 21, outlet pressures meter 22, inlet triplet for water 23, inlet valve 24, and three interfaces of inlet triplet for water 23 are connected with constant speed and constant pressure pump 21, outlet pressures meter 22, inlet valve 24 respectively by pipeline; Constant speed and constant pressure pump 21 realizes constant pressure water flooding, outlet pressures meter 22 real-time monitored flood-pot experiment line pressure.
The clamping of true triaxial rock core and control subsystem 3, comprising: true triaxial core holding unit 31, gas injection pore 32a, water filling pore 32b, pressure transducer 33, temperature sensor 34, water bath with thermostatic control 35, endpiece valve 36, endpiece constant pressure valve 37, pressure gauge 38, endpiece threeway 39; True triaxial core holding unit 31 can clamp, fixing seal coal sample coal sample is applied to the confined pressure in axial compression and X, Y, Z tri-directions, and belong to prior art, no longer describe in detail, true triaxial core holding unit 31 is placed in water bath with thermostatic control 35 and keeps constant temperature; True triaxial core holding unit 31 top is provided with gas injection pore 32a, water filling pore 32b; Air intake valve 19 is connected with gas injection pore 32a by pipeline, realizes gas injection and vacuumizes; Inlet valve 24 is connected with water filling pore 32b by pipeline, for the clamping of true triaxial rock core applies saturated groundwater environment with control subsystem 3; The entrance point of true triaxial core holding unit 31 is provided with pressure transducer 33, for real-time monitored true triaxial core holding unit 31 internal pressure; The inside of true triaxial core holding unit 31 is provided with temperature sensor 34, for real-time monitored true triaxial core holding unit 31 internal temperature; Water bath with thermostatic control 35 is connected with constant speed and constant pressure pump 21 entrance by external water pipe, for keeping the water filling temperature of constant speed and constant pressure pump 21 consistent with system temperature; True triaxial core holding unit 31 endpiece is connected by pipeline successively with endpiece valve 36, endpiece constant pressure valve 37;
Dehydration measuring subsystem 4, comprise: dehydration plant 41, precision electronic balance 42, mass-flow gas meter 43, dehydration plant 41 is separated for carrying out dehydration to the clamping of true triaxial rock core with control subsystem 3 endpiece mixing wastewater with air fluid out, belongs to prior art, no longer describes in detail; Dehydration plant 41 is placed on precision electronic balance 42, for measuring the accumulative outflow quality of the clamping of true triaxial rock core and control subsystem 3 endpiece; The top of dehydration plant 41 is provided with entrance, outlet;
Three interfaces of endpiece threeway 39 are connected with the entrance at endpiece constant pressure valve 37, pressure gauge 38, dehydration plant 41 top respectively; Pressure gauge 38 is for real-time monitored endpiece experiment line pressure, the outlet at dehydration plant 41 top is provided with exhaust line, exhaust line is provided with mass-flow gas meter 43, for measuring the accumulative eluting gas quality of the clamping of true triaxial rock core and control subsystem 3 endpiece.
Saturation water Coal Under rock isothermal desorption curve determination method, adopts above-mentioned saturation water Coal Under rock isothermal desorption curve determination device, specifically comprises the following steps:
S1: the porosity measuring coal petrography standard specimen, loaded by standard specimen in true triaxial core holding unit 31, and entirety is inserted in water bath with thermostatic control 35, opens water bath with thermostatic control 35, setting experimental temperature;
S2: the emptying oiling in the triaxial cell to true triaxial core holding unit 31, checks whether each system normally works, and checking experiment device impermeability;
S3: open vacuum pump valve 15 and vacuum pump 14, degassed 3-6h is carried out to standard specimen;
S4: close vacuum pump valve 15 and vacuum pump 14, axial compression and the confined pressure of true triaxial core holding unit 31 are set, gas cylinder 11 is changed to high pressure helium gas cylinder, open valve 12 of giving vent to anger, helium (purity > 99.999%) is filled with to system, after pressure transducer 33 registration is stable, by the inlet end high-precision gas mass flowmeter 18 of record and the registration value of pressure transducer 33, by the free space volumes of following formula computing system, repeat experiment three times, average as free space volumes:
In formula: V
freefor free space volumes, m
3; P is the system pressure after balance, Pa; M is the quality being filled with helium in clamper, g; M is gas relative molecular mass, g/mol; Z is Gas Compression Factor, dimensionless; R is universal gas constant, 8.314J/ (molK); T is system temperature, K;
S5: open vacuum pump valve 15 and vacuum pump 14, closes after vacuumizing 3-6h to systems stay;
S6: gas cylinder 11 is changed to high pressure gas cylinder to be measured, opens valve 12 of giving vent to anger, be filled with gas to be measured to test set pressure to system, injection length continues more than 12h; Closedown is given vent to anger valve 12, record entry end high-precision gas mass flowmeter 18 and pressure transducer 33 registration value, and certainty annuity gas to be measured adds up the system pressure after being filled with quality and balance;
S7: close air intake valve 19, the pressure of setting endpiece constant pressure valve 37 is the system pressure after balance, open inlet valve 24 and endpiece valve 36, constant speed and constant pressure pump 21 stablizes water filling with the level a little more than system pressure in true triaxial core holding unit 31, until the registration value of high-precision gas mass flowmeter 43 is unchanged in 3-6h, thinks that now coal petrography standard specimen reaches capacity water state, close inlet valve 24, the registration value of record precision electronic balance 42, is designated as m
wi;
S8: system balancing 12-48h, treat that the registration of pressure transducer 33 tends towards stability, by pressure transducer 33, precision electronic balance 42 and high-precision gas mass flowmeter 43 respectively register system equalized pressure, system add up effluent characteristics and endpiece gas to be measured is accumulative flows out quality, calculate adsorbed gas volume according to following formula:
In formula: V
adfor gas absorption amount to be measured, m
3; m
tquality is filled with, g for system gas to be measured is accumulative; m
gquality is flowed out, g for endpiece gas to be measured is accumulative; φ is test specimen mean porosities; V
sfor test specimen volume; m
wfor system adds up effluent characteristics, g; ρ
wfor the density of water, g/cm
3; Subscript 0 represents standard state;
S9: successive adjustment reduces the pressure of endpiece constant pressure valve 37, releases part gas to be measured, repeats step S8, S9, until the minimum experimental pressure of design;
S10: the system balancing pressure experimentally recorded and the adsorbed gas volume of correspondence thereof, draws saturation water Coal Under rock isothermal desorption curve.
By changing the condition such as loading stress, temperature, water quality in experimentation, coal petrography isothermal desorption situation of change under different geology and engineering specifications can be studied, thus provide experiment basis for the design of coal-seam gas effective exploitation and theoretical research.
Claims (7)
1. a saturation water Coal Under rock isothermal desorption curve determination device, comprising: gas injection with vacuumize control subsystem, water filling control subsystem, true triaxial rock core clamp and control subsystem and the measuring subsystem that dewaters; It is characterized in that: gas injection with vacuumize control subsystem and to be clamped by pipeline and true triaxial rock core and be connected with the gas injection pore of control subsystem, for the clamping of true triaxial rock core is with control subsystem gas injection with vacuumize; Water filling control subsystem is clamped by pipeline and true triaxial rock core and is connected with the water filling pore of control subsystem, for the clamping of true triaxial rock core applies saturated groundwater environment with control subsystem; True triaxial rock core clamps the dehydration plant inlet end being connected the measuring subsystem that dewaters with the endpiece of control subsystem by pipeline; The clamping of true triaxial rock core provides coal petrography standard specimen to clamp and residing stress field and temperature field environmental simulation with control subsystem; Dehydration measuring subsystem realizes true triaxial rock core and clamps the metering respectively adding up to discharge air water quality with control subsystem endpiece.
2. saturation water Coal Under rock isothermal desorption curve determination device according to claim 1, it is characterized in that: gas injection with vacuumize control subsystem, comprising: gas cylinder, valve of giving vent to anger, reduction valve, vacuum pump, vacuum pump valve, four-way, inlet port pressure meter, inlet end mass-flow gas meter, air intake valve; Gas cylinder is connected by pipeline with reduction valve, and the pipeline that gas cylinder is connected with reduction valve sets out air valve; Four interfaces of four-way are connected with reduction valve, vacuum pump, inlet port pressure meter, air intake valve respectively by pipeline; The pipeline that vacuum pump is connected with four-way is provided with vacuum pump valve, and the pipeline that four-way is connected with air valve is provided with inlet end mass-flow gas meter.
3. according to claim 1 ?saturation water Coal Under rock isothermal desorption curve determination device described in 2, it is characterized in that: water filling control subsystem, comprise: constant speed and constant pressure pump, outlet pressures meter, inlet triplet for water, inlet valve, three interfaces of inlet triplet for water are connected with constant speed and constant pressure pump, outlet pressures meter, inlet valve respectively by pipeline.
4. according to claim 1 ?saturation water Coal Under rock isothermal desorption curve determination device described in 3, it is characterized in that: the clamping of true triaxial rock core and control subsystem, comprising: true triaxial core holding unit, gas injection pore, water filling pore, pressure transducer, temperature sensor, water bath with thermostatic control, endpiece valve, endpiece constant pressure valve, pressure gauge, endpiece threeway; True triaxial core holding unit is placed in water bath with thermostatic control and keeps constant temperature; True triaxial core holding unit top is provided with gas injection pore, water filling pore; Air intake valve is connected with gas injection pore by pipeline, inlet valve is connected with water filling pore by pipeline, the entrance point of true triaxial core holding unit is provided with pressure transducer, the inside of true triaxial core holding unit is provided with temperature sensor, water bath with thermostatic control is connected with constant speed and constant pressure pump intake by external water pipe, and true triaxial outlet port of rock core holder is connected by pipeline successively with endpiece valve, endpiece constant pressure valve.
5. according to claim 1 ?saturation water Coal Under rock isothermal desorption curve determination device described in 4, it is characterized in that: dehydration measuring subsystem, comprise: dehydration plant, precision electronic balance, mass-flow gas meter, dehydration plant is placed on precision electronic balance, and the top of dehydration plant is provided with entrance, outlet; Three interfaces of endpiece threeway are connected with the entrance at endpiece constant pressure valve, pressure gauge, dehydration plant top respectively; The outlet at dehydration plant top is provided with exhaust line, and exhaust line is provided with mass-flow gas meter.
6. a saturation water Coal Under rock isothermal desorption curve determination method, adopts the saturation water Coal Under rock isothermal desorption curve determination device that one of claim 1 ?5 is described, it is characterized in that, specifically comprise the following steps:
S1: the porosity measuring coal petrography standard specimen, loaded by standard specimen in true triaxial core holding unit, and entirety is inserted in water bath with thermostatic control, opens water bath with thermostatic control, setting experimental temperature;
S2: the emptying oiling in the triaxial cell to true triaxial core holding unit, whether check system normally works, and checking experiment device impermeability;
S3: open vacuum pump valve and vacuum pump, carries out degassed 3 ?6h to standard specimen;
S4: close vacuum pump valve and vacuum pump, axial compression and the confined pressure of true triaxial core holding unit are set, gas cylinder is changed to high pressure helium gas cylinder, open valve of giving vent to anger, be filled with helium to system, after pressure sensor reading is stable, by the inlet end high-precision gas mass flowmeter of record and the registration value of pressure transducer, by the free space volumes of following formula computing system, repeat experiment three times, average as free space volumes:
In formula: V
freefor free space volumes, m
3; P is the system pressure after balance, Pa; M is the quality being filled with helium in clamper, g; M is gas relative molecular mass, g/mol; Z is Gas Compression Factor, dimensionless; R is universal gas constant, 8.314J/ (molK); T is system temperature, K;
S5: open vacuum pump valve and vacuum pump, closes after vacuumizing 3 ?6h to systems stay;
S6: gas cylinder is changed to high pressure gas cylinder to be measured, opens valve of giving vent to anger, be filled with gas to be measured to test set pressure to system, injection length continues more than 12h; Closedown is given vent to anger valve, record entry end high-precision gas mass flowmeter and pressure sensor reading value, and certainty annuity gas to be measured adds up the system pressure after being filled with quality and balance;
S7: close air intake valve, the pressure of setting endpiece constant pressure valve is the system pressure after balance, open inlet valve and endpiece valve, constant speed and constant pressure pump stablizes water filling with the level a little more than system pressure in true triaxial core holding unit, until the registration value of high-precision gas mass flowmeter 3 ?unchanged in 6h, think that now coal petrography standard specimen reaches capacity water state, close inlet valve, the registration value of record precision electronic balance, is designated as m
wi;
S8: system balancing 12 ?48h, treat that the registration of pressure transducer tends towards stability, by pressure transducer, precision electronic balance and high-precision gas mass flowmeter respectively register system equalized pressure, system add up effluent characteristics and endpiece gas to be measured is accumulative flows out quality, calculate adsorbed gas volume according to following formula:
In formula: V
adfor gas absorption amount to be measured, m
3; m
tquality is filled with, g for system gas to be measured is accumulative; m
gquality is flowed out, g for endpiece gas to be measured is accumulative; φ is test specimen mean porosities; V
sfor test specimen volume; m
wfor system adds up effluent characteristics, g; ρ
wfor the density of water, g/cm
3; Subscript 0 represents standard state;
S9: successive adjustment reduces the pressure of endpiece constant pressure valve, releases part gas to be measured, repeats step S8, S9, until the minimum experimental pressure of design;
S10: the system balancing pressure experimentally recorded and the adsorbed gas volume of correspondence thereof, draws saturation water Coal Under rock isothermal desorption curve.
7. saturation water Coal Under rock isothermal desorption curve determination method according to claim 6, it is characterized in that: by changing the condition such as loading stress, temperature, water quality in experimentation, coal petrography isothermal desorption situation of change under different geology and engineering specifications can be studied.
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