CN109946215A - A kind of original position coal body gas absorption amount test simulator - Google Patents
A kind of original position coal body gas absorption amount test simulator Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 255
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 68
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000001179 sorption measurement Methods 0.000 claims abstract description 62
- 238000011065 in-situ storage Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008859 change Effects 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 15
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000013480 data collection Methods 0.000 claims abstract description 6
- 239000011888 foil Substances 0.000 claims description 49
- 238000002474 experimental method Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000002360 preparation method Methods 0.000 claims description 10
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000011160 research Methods 0.000 claims description 3
- 238000013517 stratification Methods 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 238000012512 characterization method Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000008961 swelling Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 239000002817 coal dust Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 241000208340 Araliaceae Species 0.000 description 3
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 3
- 235000003140 Panax quinquefolius Nutrition 0.000 description 3
- 235000008434 ginseng Nutrition 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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- 239000000843 powder Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The present invention relates to a kind of coal body gas absorption amount test simulators in situ, including coal body simulation system in situ, pumping water into coal system, adsorption equilibrium system, absorption monitoring system, data collection and transmission；It is tested in coal body simulation system in situ using column coal body, loader is pressed to simulate stress suffered by coal body in situ by confining pressure loader and axis, the water content of coal body in situ is simulated by pumping water into coal system, gas occurs with coal body adsorption dynamics adsorption kinetics process of the dynamic change characterization reaction coal body to gas of coal body strain in adsorption process, timing node before and after reaching adsorption equilibrium using coal body is key point, determine gas reference cylinder pressure change caused by coal body suction-operated, show that coal body is to the adsorbance of gas under different condition by changing simulation stress and water content suffered by coal body, not only solve the shortcoming of normal capacity method, coal body provides a method the adsorption capacity of gas under more accurate assessment in-situ condition.
Description
Technical field
The invention belongs to Unconventional gas development field, specifically a kind of original position coal body gas absorption amount test simulation dress
It sets.
Background technique
Currently, the test in relation to coal seam reservoirs gas absorption amount be to fine coal under the conditions of not carrying, using volumetric method into
Row static state adsorption isotherm experiment, and coal seam reservoirs are assessed the adsorbance of gas under in-situ condition to gas with fine coal in experimentation
The underlying parameters such as the adsorption capacity and coal seam reservoirs gas saturation of body, and then instruct the implementation of cbm development engineering.However, powder
Coal is completely inconsistent with practical coal seam reservoirs in terms of granularity, stress state, and which results in the static state of fine coal under the conditions of not carrying
The gas absorption that adsorption isotherm experiment obtains measures test result and practical coal seam reservoirs grave fault, and such case is in deep
Coal seam reservoirs under high temperature, large ground pressure become apparent.In addition, in the common static adsorption isotherm experiment based on volumetric method,
The adsorption swelling of coal dust will cause the variation of sample cylinder free space volumes, this is further free to sample cylinder is based in volumetric method
Spatial volume and the test result of coal dust gas absorption amount obtained forms error.However due to the influence of difficulty of test, at present
The bearing calibration that sample cylinder free space volumes are influenced in relation to coal dust adsorption swelling there is no.
Summary of the invention
To solve the deficiencies in the prior art, the present invention provides a kind of coal body gas absorption amount test simulator in situ, with
Coal body gas occurs adsorption dynamics adsorption kinetics process of the dynamic change characterization reaction coal body to gas of coal body strain in adsorption process,
Timing node before and after reaching adsorption equilibrium using coal body determines gas reference cylinder pressure caused by coal body suction-operated as key point
Variation, and then coal body is to the adsorbance of gas under combination actual gas state equation acquisition simulation in-situ condition, the present invention is not only
Solves the shortcoming of normal capacity method, coal body provides one to the adsorption capacity of gas under more accurate assessment in-situ condition
Kind method.
The object of the invention to solve the technical problems adopts the following technical solutions to realize.It proposes according to the present invention
A kind of coal body gas absorption amount test simulator in situ, including coal body simulation system in situ, pumping water into coal system, absorption is flat
Balance system, absorption monitoring system, data collection and transmission；
The original position coal body simulation system includes clamper, electric heater, column coal body, Hydrauservo System；It is hydraulic to watch
Dress system includes hydraulic pump, confining pressure loader, axis pressure loader；Wherein, electric heater is mounted on clamper appearance by pedestal
Face simultaneously makes clamper internal temperature reach preset temperature clamper heating；Column coal body is placed in clamper, and hydraulic pump passes through
Hydraulic line and overflow valve are all connected with confining pressure loader and axis pressure loader, and confining pressure loader is installed on clamper outer surface,
Axis pressure loader is installed on clamper left end；
The pumping water into coal system include water tank, the high-pressure hydraulic pump for being set to waterflood-transmission line, water flow valve, water pressure gauge,
Water flowmeter, water tank are connect by the waterflood-transmission line with clamper, and high-pressure hydraulic pump, water flow valve, water pressure gauge, water flowmeter exist
Direction on waterflood-transmission line along water tank to clamper is set gradually；
The adsorption equilibrium system includes clamper outlet valve, CH4Gas cylinder, CO2Gas cylinder, gas booster pump, CH4With reference to
Cylinder, CO2With reference to cylinder, it is set to CH4First valve of gas cylinder export pipeline is set to CO2Second valve of gas cylinder export pipeline,
It is set to the third valve of vacuum pump vacuum lines, is set to the 4th valve, the 5th valve, the 6th of gas boosting pump discharge
Valve, vacuum pump, CH4With reference to cylinder imported valve, CH4With reference to cylinder outlet valve, CO2With reference to cylinder imported valve, CO2Go out with reference to cylinder
Mouth valve, the 7th valve, the 8th valve；Wherein, CH4Gas cylinder, CO2Gas cylinder is connect with gas booster pump, and vacuum pump is installed on
CH4Gas cylinder, CO2After gas cylinder, before gas booster pump, CH4With reference to cylinder, CO2Successively be installed on reference to cylinder gas booster pump it
Afterwards；Vacuum pump is connect by vacuum lines with air shooter line；
Absorption monitoring system includes being installed on CH4With reference to cylinder arrival end first gas pressure gauge, be installed on CO2With reference to cylinder
The second gas pressure gauge of arrival end, is installed on CH at third gas pressure gauge4With reference to cylinder, CO2With reference to the gas pressure after cylinder
Autotracking unit, first gas flowmeter, the first foil gauge, the second foil gauge, second gas flowmeter；7th valve
Door, the 8th valve are respectively arranged in gas pressure autotracking unit both ends；7th valve left end and the 8th valve right end are also connected with
There is an auxiliary line for being equipped with the 5th valve, the gas output tube line where auxiliary line and gas pressure autotracking unit is simultaneously
Join, is sequentially installed with third gas pressure gauge, first gas flowmeter, the 6th valve on the gas output tube line after the 8th valve
Door；First foil gauge is axially installed to column coal body surface, and the second foil gauge is radially mounted in column coal body surface；Second
Gas flowmeter is set to after clamper outlet valve；
The data collection and transmission includes data acquisition device and computer, data acquisition device by data line with
Hydraulic pump, first gas pressure gauge, second gas pressure gauge, third gas pressure gauge, gas pressure autotracking unit, the first gas
Flowmeter body, second gas flowmeter, the first foil gauge, the second foil gauge, computer are all connected with.
Further, the CH4With reference to cylinder, CO2It is the fixed volume rigid cylinders of accurate definite value with reference to cylinder.
Further, column coal body diameter 50cm, length 100cm.
Further, first gas pressure gauge, second gas pressure gauge and third gas pressure meter accuracy are 0.01MPa.
Further, the first foil gauge and the second foil gauge precision are 10-8。
Original position coal body gas absorption amount test simulator above-mentioned measures the method packet of examination to coal body gas absorption in situ
Include following steps:
(1), column coal body, column coal body, with sand paper on column coal body surface preparation of samples: are drilled along vertical stratification direction
Rough surface is polished with the radial pre- position for pasting foil gauge respectively in axial direction；Is pasted respectively in axial direction in column coal body surface
One foil gauge radially pastes the second foil gauge；
(2), sample is installed: being opened clamper, the column coal body for pasting overstrain piece is put into clamper, and by first
Foil gauge, the second foil gauge are connected to data acquisition device with data line；Opening electric heater is heated to experimental temperature to clamper,
Guarantee that column coal body is in set temperature environment；
(3), confining pressure, axis pressure alternately load: connection Hydrauservo System, according to first plus confining pressure, again plus axis pressure principle grasp
Make, operating procedure is successively are as follows: a, first start hydraulic pump, pause adds after applying the confining pressure of 2MPa to column coal body with confining pressure loader
It carries；B, axis pressure loader is opened to load is suspended after the axis pressure of column coal body application 2MPa, a and b step is repeated, until being loaded onto
Axis pressure and confining pressure be experiment setting stress state after close hydraulic pump；
(4), air tight test: confining pressure, axis pressure alternately load after, be first shut off all valves, then open third valve,
4th valve, CH4With reference to cylinder imported valve, CH4With reference to cylinder outlet valve, CO2With reference to cylinder imported valve, CO2With reference to cylinder outlet valve
Door, the 5th valve, the 6th valve, starting vacuum pump carry out whole device system to be evacuated to first gas pressure gauge, second
The pressure value of gas gauge and third gas pressure gauge is -0.1MPa, is then switched off third valve, whether is observed pressure value
Stablize；If pressure value keeps stablizing, then step (5) are carried out；If pressure value is unstable, repeat step (2) and (3)；
(5), fill the water: after air tight test, starting high-pressure hydraulic pump opens water flow valve, holding water pressure gauge numerical value as 2MPa
Pressure value, Xiang Zhuzhuan pumping water into coal, when the numerical value that water flowmeter is shown is preset water filling volume, closing water flow valve terminates to infuse
Water；
(6), it stable state adsorbed gas source preparation: closes and removes the second valve, the 4th valve, CO2Institute outside with reference to cylinder imported valve
There is valve, starts gas booster pump to CO2CO is carried out with reference to cylinder2Gas boosting is pressurized to the pressure that second gas pressure gauge is shown
When value is higher than highest experimental pressure value 3MPa, CO is closed2Stop being pressurized with reference to cylinder imported valve；
(7), gas injection is adsorbed: after completing the source preparation of stable state adsorbed gas, closing all valves, setting gas pressure automatically tracks
Device be experimental pressure value, control to column coal body inject gas pressure be always setting experimental pressure value, guarantee clamper
Cylindrical coal body at constant pressure adsorb by stable state, then successively opens CO2With reference to cylinder outlet valve, the 7th valve, the 8th valve,
Six valves inject CO to column coal body2Gas carries out adsorption experiment, the gas of first gas flowmeter acquisition injection clamper
Amount；Computer record axial strain data, radial strain data and CO in experimentation2Change number with reference to cylinder pressure
According to, and upper forming curves are schemed at one, as axial strain data, radial strain data and CO2With reference to cylinder pressure data
When steady constant, terminate gas injection adsorption experiment；All valves are then shut off, opening clamper outlet valve will be in clamper
CO2Gas is bled off, the gas flow that second gas flowmeter acquisition clamper is bled off；And then, it closes and removes third valve, the 4th valve
All valves outside door, the 5th valve, the 6th valve, starting vacuum pump vacuumize column coal body, remove remaining in coal body
CO2Gas terminates experiment.
(8), key point sentences knowledge under suction-operated: using the coal body axial strain curve of the first foil gauge record as foundation,
It chooses at the beginning of suction-operated occurs for coal body at axial strain curve turning point, with the steady constant place of axial strain curve
Reach the end of time of adsorption saturation for coal body, the start time and end of time correspond respectively to CO2With reference to gas in the jar pressure
Pressure data P on power change curve2And P3；During suction-operated occurs for coal body, CO2With reference to cylinder pressure by P2Drop
For P3, with reference to CO in cylinder2The reduction amount of gas be just under emulation mode coal body to CO2The adsorbance of gas；
(9), the calculating of gas absorption amount: gas absorption amount is calculated as unit of gas molar amount, according to actual gas shape
State equation ni=PiV/(ZiRT P) is calculated2、P3Corresponding gas molar amount n2、n3, further according to formula Δ n=n2-n3It calculates
Out simulate home state under coal body to CO2The adsorbance Δ n of gas；Actual gas state equation ni=PiV/(ZiRT in), PiFor
Gas pressure, unit: 10-3MPa, V are the volume of gas reference cylinder, unit: cm3, ZiFor corresponding to gas pressure PiLower gas
Compressibility factor, R are gas constant, and T is temperature, unit: K, niFor the mole of gas, unit: mol.
Further, during step (3) stress loading, column coal body splits in order to prevent, using the side of Stress Control
Formula is loaded, and loading speed is less than or equal to 0.05MPa/s.
Further, the experimental temperature in step (2) can be 25 DEG C~60 DEG C, the stress of experiment setting in step (3)
It can be 8~50MPa, preset water filling volume can be 5~30mL in step (5).
Further, after coal body adsorbance in situ calculates, starting vacuum pump vacuumizes clamper；It can repeat step
(3), (4), (5), (6), (7), (8), (9), by changing stress, coal moisture content and the gas injection pressure of coal body, into
One step carries out the test experiments of original position coal body gas absorption amount under different condition, finally sums up stress, the property of water-bearing, gas pressure
To the affecting laws of coal body gas absorption amount in situ, gas sorption ability is commented for coal body under the conditions of research Geological background
Offer foundation is provided.
Further, above-mentioned test device and test method can be used for simulating coal body in situ to CH4And/or CO2Gas is inhaled
In the test of attached amount.
By adopting the above technical scheme, the present invention has the advantage that
The present invention carries out stress loading to coal body using coal body substitution fine coal, using Hydrauservo System, by using original
Position coal body simulation system and pumping water into coal system, can be realized the simulation to coal seam reset condition, locating for actual response coal body
Ambient stress, formation temperature, property of water-bearing information etc.；Gas may be implemented in gas pressure autotracking unit before being installed on clamper
The tracing control of body pressure guarantees that column coal body carries out stable state absorption.Experiment used by air content test is carried out in the present invention
Sample is column coal body, rather than fine coal, and carries out gas absorption under the conditions of simulating prime stratum and measure examination, with coal body to gas
The dynamic change characterization reaction coal body of coal body strain in adsorption process occurs to the adsorption dynamics adsorption kinetics process of gas, is reached with coal body
Timing node before and after adsorption equilibrium is key point, and then determines gas reference cylinder pressure change caused by coal body suction-operated,
And then it combines actual gas state equation to obtain coal body under simulation in-situ condition and coal body adsorption swelling is passed through to the adsorbance of gas
To gas this microscopic behavior of suction-operated occurs for the measurement dynamic response coal strained in the process, and experimental measurements are high；Energy
Coal body in situ under the conditions of different stress, different temperatures, different water cut tests the adsorbance of gas, is coal in block
The reasonable assessment of layer gas stock number provides technical solution, not only solves the shortcoming of normal capacity method, more accurately comments
Estimate coal body under in-situ condition to provide a method the adsorption capacity of gas.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the perspective view of column coal body described in Fig. 1 of the present invention.
Fig. 3 is axial strain, radial strain and the CO of column coal body recorded in the method for the present invention2With reference to gas in cylinder
Body pressure data figure.
[main element symbol description]
1: air shooter line 2: gas output tube line 3: vacuum lines 4: auxiliary line
5: waterflood-transmission line 11: clamper 12: electric heater 13: column coal body 14: hydraulic pump
15: confining pressure loader 16: axis presses loader 17: hydraulic line 18: overflow valve
21: water tank 22: high-pressure hydraulic pump 23: water flow valve 24: water pressure gauge 25: water flowmeter
31: clamper outlet valve 32:CH4Gas cylinder 33:CO2Gas cylinder 34: gas booster pump
35:CH4With reference to cylinder 36:CO2With reference to 37: the first valve of cylinder, 38: the second valve 39: third valve
40: the four valve, 41: the five valve, 42: the six valve 43: vacuum pump
44:CH4With reference to cylinder imported valve 45:CH4With reference to cylinder outlet valve 46:CO2With reference to cylinder imported valve
47:CO2With reference to 48: the seven valve of cylinder outlet valve, 49: the eight valve 51: first gas pressure gauge
52: second gas pressure gauge 53: third gas pressure gauge 54: gas pressure autotracking unit
55: 56: the first foil gauge of first gas flowmeter, 57: the second foil gauge
58: second gas flowmeter 61: data acquisition device 62: computer
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Accompanying drawings and embodiments, to a kind of coal body gas absorption amount test simulator in situ proposed according to the present invention, specific implementation
Mode, structure, feature and its effect, detailed description are as follows.
As shown in Figure 1 to Figure 3, the invention provides the following technical scheme: a kind of original position coal body gas absorption measures the mould of examination
Quasi- device, including coal body simulation system in situ, pumping water into coal system, adsorption equilibrium system, absorption monitoring system, data acquisition with
Analysis system；
Coal body simulation system in situ includes clamper 11, electric heater 12, column coal body 13, Hydrauservo System；Wherein,
Electric heater is mounted on clamper outer surface, column coal body diameter 50cm, length 100cm, by clamping by metab
Device heating is in the column coal body in clamper in preset temperature environment.Hydrauservo System include hydraulic pump 14,
Confining pressure loader 15, axis press loader 16；Hydraulic pump is added by hydraulic line 17 and overflow valve 18 and confining pressure loader and axis pressure
It carries device to be all connected with, confining pressure loader is mounted on clamper outer surface, and axis pressure loader is mounted on clamper left end.
Pumping water into coal system includes water tank 21, high-pressure hydraulic pump 22, water flow valve 23, water pressure gauge 24, water flowmeter 25.Storage
Water tank 26 is connect by waterflood-transmission line 5 with clamper 11, and high-pressure hydraulic pump, water flow valve, water pressure gauge, water flowmeter are in waterflood-transmission line
On set gradually along the direction of water tank to clamper.
Adsorption equilibrium system includes, clamper outlet valve 31, CH4Gas cylinder 32, CO2Gas cylinder 33, gas booster pump 34, CH4
With reference to cylinder 35, CO2With reference to cylinder 36, the first valve 37, the second valve 38, third valve 39, the 4th valve 40, the 5th valve 41,
6th valve, 42 vacuum pump 43, CH4With reference to cylinder imported valve 44, CH4With reference to cylinder outlet valve 45, CO2With reference to cylinder imported valve
46、CO2With reference to cylinder outlet valve 47, the 7th valve 48, the 8th valve 49.Wherein, CH4Gas cylinder 32, CO2Gas cylinder 33 is and gas
Booster pump 34 connects, and vacuum pump 43 is installed on CH4Gas cylinder, CO2After gas cylinder, before gas booster pump 34, CH4With reference to cylinder 35,
CO2It is successively installed on after gas booster pump 34 with reference to cylinder 36；Wherein, CH4With reference to cylinder, CO2It is consolidating for accurate definite value with reference to cylinder
Determine volume rigid cylinders.CH4Gas cylinder, CO2The first valve 37, the second valve 38, CH are separately installed on the export pipeline of gas cylinder4
Or CO2Gas booster pump is entered by air shooter line 1, and respectively enters CH by gas output tube line 24With reference to cylinder,
CO2With reference to progress gas injection experiment in cylinder and subsequent entrance clamper.Vacuum pump 43 is true by the pumping for being equipped with third valve 39
Blank pipe line 3 is connect with air shooter line 1；4th valve 40 is set to the outlet of gas booster pump 34.
Adsorbing monitoring system includes first gas pressure gauge 51, second gas pressure gauge 52, third gas pressure gauge 53, gas
Body pressure autotracking unit 54, first gas flowmeter 55, the first foil gauge 56, the second foil gauge 57, second gas flowmeter
58；Wherein, first gas pressure gauge is installed on CH4With reference to cylinder arrival end, second gas pressure gauge is installed on CO2With reference to cylinder entrance
End；Gas pressure autotracking unit is installed on CH4With reference to cylinder, CO2After cylinder, and gas pressure autotracking unit both ends point
7th valve, the 8th valve are not installed, 1 is also connected in the 7th valve left end and the 8th valve right end and the 5th valve is installed
The auxiliary line 4 of door, auxiliary line 4 are in parallel with the gas output tube line where gas pressure autotracking unit 54；8th valve
Third gas pressure gauge 53, first gas flowmeter 55, the 6th valve 42 are sequentially installed on gas output tube line after 49；
First foil gauge 56 is axially installed to column coal body surface, and the second foil gauge 57 is radially mounted in column coal body surface；The
One gas gauge 51, second gas pressure gauge 52 and 53 precision of third gas pressure gauge are 0.01MPa, the first foil gauge and the
The strain stress precision of two foil gauges is 10-8。
Data collection and transmission includes data acquisition device 61 and computer 62, and the data acquisition device is integrated form number
According to vasculum, can by data line respectively with hydraulic pump, first gas pressure gauge, second gas pressure gauge, third gas pressure
Power table, gas pressure autotracking unit, first gas flowmeter, second gas flowmeter, the first foil gauge, the second foil gauge,
Computer connection, wherein computer can realize the analysis and mapping to data acquisition device acquisition data.
First foil gauge and the second foil gauge are by the strain variation during detection column coal body adsorbed gas, using coal
During body adsorbed gas coal body strain occur this mode of dynamic change solve common static adsorption isotherm experiment can not be anti-
Answer coal to this problem of gas adsorption processes, at the same using coal body reach adsorption swelling balance front and back timing node as key point,
Read coal body adsorption equilibrium front and back CH4With reference to cylinder or CO2With reference to the gas pressure value of cylinder, and then combination is with reference to cylinder gas and very
The real equation of gas state calculates coal body in situ to CH4Or CO2The adsorbance of gas.
The validity of the simulator of examination, the present inventor's acquisition are measured for a kind of coal body gas absorption in situ of the verifying present invention
The jet coal in Shan mining area is covered, with CO2For gas, coal body gas absorption in situ is carried out using the present invention and has measured examination.
When carrying out coal body gas absorption measurement examination in situ using the present invention, operated according to the following steps:
(a), preparation of samples: acquisition drills column coal body, column along vertical stratification direction from the jet coal for covering Shan mining area
Coal body diameter 50cm, length 100cm；Paste the position of foil gauge in advance with radial direction respectively in axial direction on column coal body surface with sand paper
Polish rough surface；Further, referring to fig. 2, second is radially pasted in column coal body surface along axial first foil gauge of pasting
Foil gauge is in column coal body surface；
(b), sample is installed: opening clamper, the column coal body for pasting overstrain piece is put into clamper, is placed
Afterwards, the first foil gauge, the second foil gauge are connected to data acquisition device with data line；Then, opening electric heater is to clamper
It is heated to experimental temperature, can be 30 DEG C, guarantees that column coal body is in set temperature environment；
(c), confining pressure, axis pressure alternately load: connection Hydrauservo System, according to first plus confining pressure, again plus axis pressure principle into
Row operation, operating procedure is successively are as follows: a, first starts hydraulic pump, with confining pressure loader to temporary after the confining pressure of column coal body application 2MPa
Stop loading；B, axis pressure loader is opened to load is suspended after the axis pressure of column coal body application 2MPa, repeats a and b step, Zhi Daojia
After being loaded onto the stress state of axis pressure 10MPa, confining pressure 10MPa, hydraulic pump is closed；During stress loading, column coal in order to prevent
Body splits, and is loaded by the way of Stress Control, and loading speed is less than or equal to 0.05MPa/s；
(d), air tight test: confining pressure, axis pressure alternately load after, be first shut off all valves, then open third valve,
4th valve, CH4With reference to cylinder imported valve, CH4With reference to cylinder outlet valve, CO2With reference to cylinder imported valve, CO2With reference to cylinder outlet valve
Door, the 5th valve, the 6th valve, starting vacuum pump vacuumize whole device system, are evacuated to first gas pressure
The pressure value of table, second gas pressure gauge and third gas pressure gauge is -0.1MPa, is then switched off third valve, observation pressure
Whether force value is stable；If pressure value keeps stablizing, then step (e) is carried out；If pressure value is unstable, repeat step (b) and
(c)；
(e), it fills the water: after air tight test, closing all valves, starting high-pressure hydraulic pump opens water flow valve, keeps hydraulic pressure
Table numerical value is 2MPa pressure value, and Xiang Zhuzhuan pumping water into coal (is equivalent to coal body to contain at this time when the numerical value that water flowmeter show is 10mL
Water is 10% or so), water flow valve is closed, water filling is terminated；
(f), it stable state adsorbed gas source preparation: is filled to have when ensureing that the stable state absorption under constant gas adsorptive pressure occurs for coal body
The gas source of foot, experiment have carried out stable state adsorbed gas source preparation before starting, and remove the second valve, the 4th valve, CO firstly, closing2Ginseng
All valves outside cylinder imported valve are examined, start gas booster pump to CO2CO is carried out with reference to cylinder2Gas boosting is pressurized to the second gas
When the pressure value that body pressure gauge is shown is higher than highest experimental pressure value 3MPa, CO is closed2With reference to cylinder imported valve, stop pressurization；
(g), gas injection is adsorbed: after completing the source preparation of stable state adsorbed gas, all valves is closed, with 6MPa (experimental pressure value) gas
For suction-operated occurs for coal body under body pressure, gas pressure autotracking unit is set as 6MPa, is controlled and is injected to column coal body
Gas pressure be always 6MPa, guarantee clamper cylindrical coal body carry out stable state absorption at constant pressure, then successively open CO2
CO is injected to column coal body with reference to cylinder outlet valve, the 7th valve, the 8th valve, the 6th valve2Gas carries out adsorption experiment；
The gas flow of first gas flowmeter acquisition injection clamper；Computer record axial strain data, radial direction are answered in experimentation
Parameter evidence and CO2With reference to cylinder pressure delta data, and upper forming curves are schemed at same, when axial strain data, diameter
To strain data and CO2When steady constant with reference to cylinder pressure data, terminate gas injection adsorption experiment；Then, institute is closed
There is valve, opens clamper outlet valve for the CO in clamper2Gas is bled off, and second gas flowmeter acquisition clamper is bled off
Gas flow；And then, all valves in addition to third valve, the 4th valve, the 5th valve, the 6th valve are closed, starting is true
Sky pump vacuumizes column coal body, removes CO remaining in coal body2Gas terminates experiment.
(h), the selection of strain curve when gas absorption amount calculates: as seen from Figure 3, within the data monitoring time, number
It is good according to quality, for convenient for comparison column coal body to CO2Gas occurs in adsorption process, CO2Change feelings with reference to cylinder pressure
Condition and column coal body CO absorption2The situation of change of dependent variable in the process, by axial strain, radial strain, CO2With reference to gas in the jar
Pressure is plotted on the figure of same time coordinate.Fig. 3 shows CO2During gas injects clamper progress gas injection absorption,
The radial strain of column coal body shows increased trend always, therefore can not sentence to know from radial strain and cause under gas absorption effect
Deflection.Due to CO2Gas is injected from clamper port, in CO2Gas injects initial stage, CO2Gas reference cylinder gas pressure is fast
Speed reduces the (midpoint Fig. 3 P1To point P2), clamper cylindrical coal body is not yet to CO at this time2Gas adsorbs, in CO2Gas pressure
The coal body axial strain that contracting acts on lower first foil gauge record shows the downward trend (midpoint Fig. 3 A11To point A22), in this stage
It is influenced by axial crushing deformation, the coal body radial strain of the second foil gauge record is increase accordingly；With continuing for gas injection time,
To point A22When, the coal body axial strain of the first foil gauge record shows increased trend, it is clear that this is because coal body is to CO2Hair
Caused by raw suction-operated causes coal body to expand, adsorption swelling deformation, column coal body occurs along with the generation coal body of suction-operated
Axial strain is by A11To A22The compressive deformation of section switchs to from A22The adsorption swelling deformation that point starts, coal body axial strain and radial direction
Strain continues to increase, it can be seen that turning point A in axial strain curve22As column coal body is to CO2Gas occurs absorption and makees
Initial time；To point A33Column coal body has reached adsorption saturation state, suction-operated no longer occurs to gas, accordingly not
There is adsorption swelling phenomenon again, coal body axial strain and radial strain continual and steady a period of time, point A33The corresponding time is
Column coal body reaches the final moment of adsorption saturation.For this purpose, choosing the axis of column coal body in Fig. 3 compared to radial strain curve
It is convenient for sentencing the starting and end time known coal body and gas occurs suction-operated to strain curve.
(i) selection of key point when gas absorption amount calculates: key point P in Fig. 31With A11, key point P2With A22, key point
P3With A33Respectively correspond identical time point.Column coal body is to CO2Before gas adsorbs, influenced by gas injection effect,
CO2Decline rapidly with reference to cylinder pressure and (corresponds to the midpoint Fig. 3 P1To P2Between), simultaneously because gas is axial from aid device
Injection plays compression to the axial direction of column coal body, and the column coal body that the first foil gauge monitors axially is in strain and reduces
State is (corresponding to point A in Fig. 3 axial strain curve11To point A22)；As column coal body is to CO2Gas takes place absorption and makees
With column coal body generates adsorption swelling and (corresponds to the midpoint Fig. 3 A22), point A in axial strain curve is adsorbed in Fig. 333It is corresponding
When time coordinate, the axial strain that the first foil gauge monitors is held essentially constant, while the radial direction that the second foil gauge monitors
Strain is held essentially constant.Simultaneously as seen from Figure 3, in column coal body to CO2(the midpoint Fig. 3 A during gas adsorbs22
To point A33Between), CO2(the midpoint Fig. 3 P is continued to decline with reference to cylinder pressure2To point P3Between), key point P is chosen respectively2
And point P3Corresponding gas pressure data P2、P3It is stored in computer, the gas absorption amount for calculating coal body for next step provides ginseng
Number.
(j) coal body gas absorption amount in situ calculates: calculating coal body gas absorption amount in situ method particularly includes:
Computer is according to actual gas state equation ni=PiV/(ZiRT) P in program calculation above-mentioned (i) step2、P3It is corresponding
Gas absorption amount n2、n3；In formula, PiFor gas pressure (10-3MPa), V is the volume (cm of gas reference cylinder3), ZiFor corresponding to
Gas pressure PiThe compressibility factor of lower gas, R are gas constant, and T is temperature (K), niFor the mole (mol) of gas.It calculates
n2、n3Afterwards, computer is according to formula Δ n=n2-n3Programming, calculated Δ n just be simulation home state under coal body to CO2Gas
Adsorbance；
(k) after coal body adsorbance in situ calculates, the 7th valve, the 8th valve are closed, open third valve, the 4th valve,
5th valve, starting vacuum pump vacuumize clamper；Repeatable step (c), (d), (e), (f), (g), (h), (i), change
Stress, the water content of coal body, gas injection pressure of coal body further carry out under different condition in situ coal body to CO2Gas is inhaled
The test experiments of attached amount finally sum up stress, the property of water-bearing, gas pressure to coal body in situ to CO2The influence of gas absorption amount
Rule provides foundation to the assessment of gas sorption ability for coal body under the conditions of research Geological background.
In the above method, the selection of strain curve is when gas absorption amount calculates with the axial strain curve that foil gauge records
Foundation, the initial time and end time adsorb to coal body carry out sentencing knowledge.The selection of key point when gas absorption amount calculates
In suction-operated occurs as coal body at axial strain curve turning point at the beginning of, with the steady constant place of axial strain curve
Reach the end of time of adsorption saturation for coal body.It is known fixed volume with reference to cylinder volume, with gas when gas absorption amount calculates
Body molal weight is unit, refers to subtracting for cylinder gas with end time using actual gas state equation acquisition absorption start time
In a small amount, as under emulation mode in situ coal body gas absorption amount.
The present invention can use same method and change valve either on or off case study original position coal body to CH4Gas absorption
The affecting laws of amount.Specifically: it is closed in above-mentioned steps (f) and removes the first valve, the 4th valve, CH4Outside with reference to cylinder imported valve
All valves, starting gas booster pump is to CH4CH is carried out with reference to cylinder4Gas boosting is pressurized to what first gas pressure gauge was shown
When pressure value is higher than highest experimental pressure value 3MPa, CH is closed4With reference to cylinder imported valve, stop pressurization；
Guarantee that clamper cylindrical coal body carries out stable state absorption at constant pressure, successively opens CH in above-mentioned steps (g)4With reference to
Cylinder outlet valve, the 7th valve, the 8th valve, the 6th valve inject CH to column coal body4Gas carries out adsorption experiment and calculates
Coal body in situ is to CH4The adsorbance of gas.
When no matter coal dust or coal body adsorb gas, adsorption swelling phenomenon only produces sample cylinder free space volumes
It is raw to influence, it has no effect to gas reference cylinder free space volumes.Gas absorption effect is influenced by coal body in sample cylinder,
Necessarily decline with reference to cylinder pressure, in the case where gas reference cylinder free space volumes are constant, when acquiring, " sample is inhaled
The pressure value of gas reference gas in the jar before and after attached balance " further takes actual gas state equation that can obtain gas ginseng
The reduction amount of gas in the jar is examined, which is just adsorbance of the coal body to gas.The present invention is not with sample cylinder free space volumes
Benchmark, but do not changed and attached most importance to the free space volumes of gas reference cylinder before and after coal body adsorption equilibrium, it is inhaled with coal body
The pressure change of gas reference cylinder is set about before and after attached balance, and then tests coal body to the adsorbance of gas, effectively overcomes routine
Volumetric method obtains the shortcoming of gas absorption amount based on sample cylinder free space volumes.Since coal is to the suction-operated of gas
A kind of phenomenon of molecular level, it is macroscopically invisible, but the dilatancy behavior during coal body adsorbed gas can use
Strain measurement means carry out, and therefore, after obtaining coal body adsorbed gas and expanding the strain curve of deformation, choose answer respectively
Adsorption swelling takes place in coal body on varied curve and coal body reaches adsorption swelling and strains the timing node balanced as key point, and
The gas pressure value for corresponding to key point in gas reference cylinder is determined with this, can obtain " sample adsorption equilibrium front and back gas ginseng
Examine the pressure value of gas in the jar ".
Original position coal body gas absorption amount test simulator disclosed by the invention, using coal body substitution fine coal, using hydraulic
Servo-system carries out stress loading to coal body, anti-with the dynamic change characterization that gas coal body strain in adsorption process occurs for coal body
Answer coal body to the adsorption dynamics adsorption kinetics process of gas, the timing node before and after reaching adsorption equilibrium using coal body is key point, Jin Erli
Determine gas reference cylinder pressure change caused by coal body suction-operated, and then combines actual gas state equation to obtain and simulate item in situ
Coal body not only solves the shortcoming of normal capacity method to the adsorbance of gas, the method under part, more accurate assessment item in situ
Coal body provides a method the adsorption capacity of gas under part.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form, appoint
What those skilled in the art, without departing from the scope of the present invention, according to the technical essence of the invention to
Any simple modification, equivalent change and modification made by upper embodiment, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of original position coal body gas absorption amount test simulator, it is characterised in that including coal body simulation system in situ, coal body
Flood pattern, adsorption equilibrium system, absorption monitoring system, data collection and transmission；
The original position coal body simulation system includes clamper (11), electric heater (12), column coal body (13), hydraulic servo system
System；Hydrauservo System includes hydraulic pump (14), confining pressure loader (15), axis pressure loader (16)；Wherein, electric heater (12)
Clamper (11) outer surface is mounted on by pedestal and so that clamper internal temperature is reached preset temperature clamper (11) heating；
Column coal body (13) is placed in clamper (11), and hydraulic pump (14) is loaded by hydraulic line (17) and overflow valve (18) and confining pressure
Device (15) and axis pressure loader (16) are all connected with, and confining pressure loader (15) is installed on clamper (11) outer surface, and axis presses loader
(16) it is installed on clamper (11) left end；
The pumping water into coal system includes water tank (21), high-pressure hydraulic pump (22), the water flow valve for being set to waterflood-transmission line (5)
(23), water pressure gauge (24), water flowmeter (25), water tank (21) are connect by the waterflood-transmission line (5) with clamper (11), high pressure
Water pump (22), water flow valve (23), water pressure gauge (24), water flowmeter (25) are on waterflood-transmission line (5) along water tank to clamper
Direction set gradually；
The adsorption equilibrium system includes clamper outlet valve (31), CH4Gas cylinder (32), CO2Gas cylinder (33), gas booster pump
(34)、CH4With reference to cylinder (35), CO2With reference to cylinder (36), it is set to CH4First valve (37) of gas cylinder (32) export pipeline, setting
In CO2Second valve (38) of gas cylinder (33) export pipeline, the third valve for being set to vacuum pump (43) vacuum lines (3)
(39), the 4th valve (40), the 5th valve (41), the 6th valve (42), vacuum pump of gas booster pump (34) outlet are set to
(43)、CH4With reference to cylinder imported valve (44), CH4With reference to cylinder outlet valve (45), CO2With reference to cylinder imported valve (46), CO2With reference to
Cylinder outlet valve (47), the 7th valve (48), the 8th valve (49)；Wherein, CH4Gas cylinder (32), CO2Gas cylinder (33) is and gas
Booster pump (34) connection, vacuum pump (43) are installed on CH4Gas cylinder (32), CO2After gas cylinder (33), before gas booster pump (34),
CH4With reference to cylinder (35), CO2It is successively installed on after gas booster pump (34) with reference to cylinder (36)；Vacuum pump (43) passes through vacuum-pumping tube
Line (3) is connect with air shooter line (1)；
Absorption monitoring system includes being installed on CH4With reference to cylinder (35) arrival end first gas pressure gauge (51), be installed on CO2Ginseng
It examines the second gas pressure gauge (52) of cylinder (36) arrival end, third gas pressure gauge (53), be installed on CH4With reference to cylinder (35), CO2
With reference to gas pressure autotracking unit (54), first gas flowmeter (55), the first foil gauge (56), second after cylinder (36)
Foil gauge (57), second gas flowmeter (58)；7th valve (48), the 8th valve (49) are respectively arranged in gas pressure
Power autotracking unit (54) both ends；7th valve (48) left end and the 8th valve (49) right end are also connected with one and are equipped with the 5th valve
The auxiliary line (4) of door (41), the gas output tube line (2) where auxiliary line (4) and gas pressure autotracking unit (54)
Parallel connection is sequentially installed with third gas pressure gauge (53), first gas stream on the gas output tube line after the 8th valve (49)
Meter (55), the 6th valve (42)；First foil gauge (56) is axially installed to column coal body (13) surface, the second foil gauge
(57) radially mounted in column coal body (13) surface；Second gas flowmeter (58) be set to clamper outlet valve (31) it
Afterwards；
The data collection and transmission includes data acquisition device (61) and computer (62), and data acquisition device (61) passes through
Data line and hydraulic pump (14), first gas pressure gauge (51), second gas pressure gauge (52), third gas pressure gauge (53),
Gas pressure autotracking unit (54), first gas flowmeter (55), second gas flowmeter (58), the first foil gauge (56),
Second foil gauge (57), computer (62) are all connected with.
2. a kind of coal body gas absorption amount test simulator in situ as described in claim 1, it is characterised in that the CH4Ginseng
Examine cylinder (35), CO2It is the fixed volume rigid cylinders of accurate definite value with reference to cylinder (36).
3. a kind of coal body gas absorption amount test simulator in situ as described in claim 1, it is characterised in that column coal body
(13) diameter 50cm, length 100cm.
4. a kind of coal body gas absorption amount test simulator in situ as described in claim 1, it is characterised in that first gas
Pressure gauge (51), second gas pressure gauge (52) and third gas pressure gauge (53) precision are 0.01MPa.
5. a kind of coal body gas absorption amount test simulator in situ as described in claim 1, it is characterised in that the first strain
Piece (56) and the second foil gauge (57) precision are 10-8。
6. a kind of coal body gas absorption amount test simulator in situ as described in claim 1, it is characterised in that for original
Position coal body gas absorption measure examination method the following steps are included:
(1), preparation of samples: column coal body is drilled along vertical stratification direction, column coal body is distinguished with sand paper on column coal body surface
The position for pasting foil gauge in advance both axially and radially polish rough surface；First is pasted respectively in axial direction in column coal body surface to answer
Become piece, radially paste the second foil gauge；
(2), sample is installed: opening clamper, the column coal body for pasting overstrain piece is put into clamper, and first is strained
Piece, the second foil gauge are connected to data acquisition device with data line；Opening electric heater is heated to experimental temperature to clamper, guarantees
Column coal body is in set temperature environment；
(3), confining pressure, axis press alternately load: connection Hydrauservo System, according to first adding confining pressure, adding the principle of axis pressure to operate again, grasp
Make step successively are as follows: a, first start hydraulic pump, suspend load after applying the confining pressure of 2MPa to column coal body with confining pressure loader；b,
Axis pressure loader is opened to load is suspended after the axis pressure of column coal body application 2MPa, a and b step are repeated, until being loaded onto axis pressure
With confining pressure be experiment setting stress state after close hydraulic pump；
(4), air tight test: after confining pressure, axis pressure alternately load, all valves is first shut off, third valve, the 4th are then opened
Valve, CH4With reference to cylinder imported valve, CH4With reference to cylinder outlet valve, CO2With reference to cylinder imported valve, CO2With reference to cylinder outlet valve,
5th valve, the 6th valve, starting vacuum pump carry out whole device system to be evacuated to first gas pressure gauge, second gas
The pressure value of pressure gauge and third gas pressure gauge is -0.1MPa, is then switched off third valve, and whether observed pressure value is steady
It is fixed；If pressure value keeps stablizing, then step (5) are carried out；If pressure value is unstable, repeat step (2) and (3)；
(5), fill the water: after air tight test, starting high-pressure hydraulic pump opens water flow valve, holding water pressure gauge numerical value as 2MPa pressure
Value, Xiang Zhuzhuan pumping water into coal, when the numerical value that water flowmeter is shown is preset water filling volume, closing water flow valve terminates to fill the water；
(6), it stable state adsorbed gas source preparation: closes and removes the second valve, the 4th valve, CO2All valves outside with reference to cylinder imported valve
Door starts gas booster pump to CO2CO is carried out with reference to cylinder2It is high to be pressurized to the pressure value that second gas pressure gauge is shown for gas boosting
When highest experimental pressure value 3MPa, CO is closed2Stop being pressurized with reference to cylinder imported valve；
(7), gas injection adsorb: complete the source preparation of stable state adsorbed gas after, close all valves, set gas pressure autotracking unit as
Experimental pressure value, control to column coal body inject gas pressure be always setting experimental pressure value, guarantee clamper inner prop
Shape coal body at constant pressure adsorb by stable state, then successively opens CO2With reference to cylinder outlet valve, the 7th valve, the 8th valve, the 6th valve
Door injects CO to column coal body2Gas carries out adsorption experiment, the gas flow of first gas flowmeter acquisition injection clamper；It is real
Computer record axial strain data, radial strain data and CO during testing2With reference to cylinder pressure delta data, and
One is schemed upper forming curves, as axial strain data, radial strain data and CO2With reference to cylinder pressure data it is steady not
When change, terminate gas injection adsorption experiment, be then shut off all valves, opens clamper outlet valve for the CO in clamper2Gas
It bleeds off, and then the gas flow that second gas flowmeter acquisition clamper is bled off closes and removes third valve, the 4th valve, the 5th
All valves outside valve, the 6th valve, starting vacuum pump vacuumize column coal body, remove CO remaining in coal body2Gas,
Terminate experiment.
(8), key point sentences knowledge under suction-operated: using the coal body axial strain curve of the first foil gauge record as foundation, choosing
At axial strain curve turning point for coal body occur suction-operated at the beginning of, using axial strain curve steadily constant place as coal
Body reaches the end of time of adsorption saturation, and the start time and end of time correspond respectively to CO2Become with reference to cylinder pressure
Change the pressure data P on curve2And P3；During suction-operated occurs for coal body, CO2With reference to cylinder pressure by P2It is reduced to P3,
With reference to CO in cylinder2The reduction amount of gas be just under emulation mode coal body to CO2The adsorbance of gas；
(9), the calculating of gas absorption amount: gas absorption amount is calculated as unit of gas molar amount, according to actual gas state side
Journey ni=PiV/(ZiRT P) is calculated2、P3Corresponding gas molar amount n2、n3, further according to formula Δ n=n2-n3Calculate depanning
Coal body is to CO under quasi- home state2The adsorbance Δ n of gas；Actual gas state equation ni=PiV/(ZiRT in), PiFor gas
Pressure, V are the volume of gas reference cylinder, ZiFor corresponding to gas pressure PiThe compressibility factor of lower gas, R are gas constant, and T is
Temperature, niFor the mole of gas.
7. a kind of coal body gas absorption amount test simulator in situ as claimed in claim 6, it is characterised in that step (3) is answered
In power loading procedure, column coal body splits in order to prevent, is loaded by the way of Stress Control, and loading speed is less than or equal to
0.05MPa/s。
8. a kind of coal body gas absorption amount test simulator in situ as claimed in claim 6, it is characterised in that in step (2)
Experimental temperature be 25~30 DEG C, the stress that experiment is set in step (3) is 8~50MPa, preset water filling body in step (5)
Product is 5~30mL.
9. a kind of coal body gas absorption amount test simulator in situ as claimed in claim 6, it is characterised in that coal body in situ
After adsorbance calculates, starting vacuum pump vacuumizes clamper；Step (3), (4), (5), (6), (7), (8), (9) are repeated, are led to
Stress, coal moisture content and the gas injection pressure for changing coal body are crossed, coal body gas in situ under different condition is further carried out
The test experiments of adsorbance finally sum up the influence rule of stress, the property of water-bearing, gas pressure to coal body gas absorption amount in situ
Rule provides foundation to the assessment of gas sorption ability for coal body under the conditions of research Geological background.
10. a kind of coal body gas absorption amount test simulator in situ as claim in any one of claims 1 to 9, special
Sign is for simulating coal body in situ to CH4And/or CO2The test of gas absorption amount.
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| CN113654477A (en) * | 2021-08-16 | 2021-11-16 | 中国矿业大学 | Coal body deformation testing device, testing system and testing method |
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