CN107703023A - A kind of surface drilling coal core modeled pressure drop desorption apparatus and test device and method - Google Patents
A kind of surface drilling coal core modeled pressure drop desorption apparatus and test device and method Download PDFInfo
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Abstract
The invention discloses a kind of surface drilling coal core modeled pressure drop desorption apparatus and test device and method, surface drilling coal core modeled pressure drop desorption apparatus, including nitrogen aerating device, closed slurry tank, back pressure servo-drive system, the desorption of mash gas instrument being sequentially connected with pipeline；Surface drilling coring coal core gas leakage simulating test device including said apparatus, in addition to coal sample tank, degasser, methane aerating device and computer；Method of testing step is：Coal sample preparation, vacuum outgas, adsorption equilibrium, modeled pressure drop desorption, gas collection process, data analysis.The present invention being capable of simulation test location of the coring procedure coal core wastage and its adsorption law, foundation for the accurate projectional technique of coal sample gas wastage provides technical support, coal seam gas-bearing capacity desorption determination method is improved, reliable gas bearing capacity measured value method is provided for the prediction of mine gas degree of danger and gas control.
Description
Technical field
The present invention relates to field of coal mine safety, more particularly to a kind of surface drilling coal core modeled pressure drop desorption apparatus and survey
Try apparatus and method.
Background technology
China is the country that coal production is maximum in the world, while is also coal mine gas problem state the most serious in the world
One of family；In Gas Disaster preventing and treating, coal seam gas-bearing capacity is the basis for calculating gas reserves and gas emission, and forecasting coal
One of with the important parameter of gas outburst risk, the accuracy of gas bearing capacity measured value not only governs mine gas degree of danger
Forecasting reliability, and influence with the validity and warp of the Firedamp precaution measures that gas degree of danger is predicted as according to and is formulated
Ji property, in some instances it may even be possible to jeopardize mine safety production.
Coal seam gas-bearing capacity assay method is divided into the method and coal mine applied in geological prospecting borehole according to application
The major class of method two of lower application, is that measuring and calculating is sampled in mud medium and air dielectric respectively；Because coal core is bored on ground
Desorption of mash gas in hole is completed in mud medium, and desorption of mash gas of the coal sample on ground is carried out in air dielectric
, both media environments and pressure medium condition difference are larger, carried with desorption of mash gas rule reckoning of the coal sample on ground drill-through
Coal sample leakage gas amount and unreasonable in journey；Can cause that coal seam gas-bearing capacity measured value stability is poor, accuracy rate is relatively low, and it is existing such as
Two of desorption method measure are surveyed modernly according to being：
1）Coal core, which is carried to drilling depth half, to be started to diffuse gas；
2）The coal core desorption of mash gas rule measured in air dielectric can calculate that location of the coring procedure coal core misses gas amount；
Because surface drilling location of the coring procedure is a transformation desorption of mash gas process, the two are according to the theory without abundance and experiment
Foundation, it is difficult to calculate the gas wastage of surface drilling location of the coring procedure coal sample exactly.
Therefore, in order to more accurately calculate the gas wastage in location of the coring procedure coal, gas bearing capacity measure is surveyed with improving
Accuracy, it is necessary to survey boring and coring coal containing methane gas gas desorption process in mud medium over the ground and carry out analog study, enter one
Step grasps the adsorption law of coal seam at different conditions, is provided safeguard for Safety of Coal Mine Production.
The content of the invention
In view of the shortcomings of the prior art part, it is an object of the invention to provide a kind of pressure drop environment Imitating containing watt
The experimental method and device of desorption of mash gas of this coal when pressure continuously reduces in mud medium, to solve accurately survey at present
Calculate the technical barrier of coal core gas wastage in surface drilling location of the coring procedure.
The purpose of the present invention is achieved through the following technical solutions：
A kind of surface drilling coal core modeled pressure drop desorption apparatus, including the nitrogen aerating device being sequentially connected with pipeline（22）, it is close
Close slurry tank（12）, back pressure servo-drive system（13）, desorption of mash gas instrument（15）；
The nitrogen aerating device（22）Including being sequentially connected valve by pipeline（11）, surge tank（10）, pressure gauge（27）, nitrogen
Gas gasing tank（9）；
The back pressure servo-drive system（13）By counterbalance valve（1301）, accumulator（1302）, pressure gauge（1303）With PID valves（1304）
Composition；
The desorption of mash gas instrument（15）Equipped with methane concentration analyzer（20）, ultrasonic range finder（29）And temperature sensor
（30）.
A kind of surface drilling coring coal core gas leakage mould including above-mentioned surface drilling coal core modeled pressure drop desorption apparatus
Intend test device, in addition to coal sample tank（6）, degasser（5）, methane aerating device（21）And computer（14）, the coal sample
Tank（6）Incubator is arranged on sealing of tank cover（7）It is interior, two interfaces are provided with the cover, an interface passes through pipeline
（17）With degasser（5）, methane aerating device（21）Connected with modeled pressure drop desorption apparatus, another interface installation pressure gauge
And thermometer（24）, the incubator（7）Connect heater（23）；Described degasser（5）The vacuum connected by pipeline
Pump（25）, valve（4）With coal sample tank（6）It is connected on pipeline；Described methane aerating device（21）By being connected successively by pipeline
The valve connect（3）, surge tank（1）, pressure gauge（26）, methane gasing tank（2）Composition.
A kind of surface drilling coring coal core gas misses analog detection method, carries out as follows：
Step1. prepared by coal sample：After the fresh lump coal collected/beans is crushed, the coal sample of certain particle diameter is sieved into, is divided into
More parts of amount, are put into drying process in drying box；
Step2. vacuum outgas：The drying coal sample loading coal sample tank that will be handled well, sets the temperature of insulating box as coal seam temperature, uses
Degasser is to coal sample tank vacuum outgas；
Step3. adsorption equilibrium：According to required adsorption equilibrium pressure, a certain amount of methane is filled with, after balance to be adsorbed, record
The actual adsorption equilibrium pressure P of pressure gauge1；
Step4. modeled pressure drop desorbs：Simulation coal sample local environment pressure P before sampling0, pass through nitrogen aerating device（22）To
Slurry tank（12）In be filled with nitrogen adjustment slurry tank（12）Interior pressure, reach predetermined pressure P0；Pass through computer（14）Control
Back pressure servo-drive system processed（13）Make slurry tank（12）The pressure drop harmonic curve of the interior pressure P simulations actual sampling process of coal sample reduces,
When P is equal to P1, coal sample tank（6）Middle coal containing methane gas starts to desorb gas, slurry tank（12）Interior pressure continues simulation, and coal sample is actual takes
The pressure drop harmonic curve of sample process reduces, and coal sample continues desorption of mash gas；
Step5. gas collection process：By slurry tank（12）Middle discharge gas（Most start to be changed into the mixed of nitrogen and methane after nitrogen
Close gas）Into desorption of mash gas instrument（15）；
Step6. data analysis：In experimentation, slurry tank（12）The pressure of the interior actual sampling process of pressure simulation coal sample reduces
Curve reduces, by computer（14）Record desorption of mash gas instrument（15）Middle gas volume V1And sensor（30）The temperature T of collection, surpass
Sound-ranging equipment（29）The water-column h and methane concentration C data measured is by computer（14）Data analysis is carried out by formula to obtain
Desorption of mash gas data when going out coal containing methane gas pressure continuously reducing in mud medium.
The present invention compared with the prior art, has advantages below and beneficial effect：
The present invention can precisely simulation surface drilling coring when coal sample residing for drilling fluid environment, and pass through back pressure servo system
System simulates the actual conditions that mud pressure reduces in drilling process, and coal core gas is missed in simulation test surface drilling location of the coring procedure
Amount and leakage rule, the foundation for the accurate projectional technique of coal sample gas wastage provide technical support, improve coal seam gas-bearing capacity
Determination method is desorbed, reliable gas bearing capacity measured value is provided for the prediction of mine gas degree of danger and gas control.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
Embodiment
As shown in figure 1, a kind of surface drilling coal core modeled pressure drop desorption apparatus, including the nitrogen being sequentially connected with pipeline fill
Device of air（22）, closed slurry tank（12）, back pressure servo-drive system（13）, desorption of mash gas instrument（15）；
The nitrogen aerating device（22）Including being sequentially connected valve by pipeline（11）, surge tank（10）, pressure gauge（27）, nitrogen
Gas gasing tank（9）；
The back pressure servo-drive system（13）By counterbalance valve（1301）, accumulator（1302）, pressure gauge（1303）With PID valves（1304）
Composition；
The desorption of mash gas instrument（15）Equipped with methane concentration analyzer（20）, ultrasonic range finder（29）And temperature sensor
（30）.
A kind of surface drilling coring coal core gas leakage mould including above-mentioned surface drilling coal core modeled pressure drop desorption apparatus
Intend test device, in addition to coal sample tank（6）, degasser（5）, methane aerating device（21）And computer（14）, the coal sample
Tank（6）Incubator is arranged on sealing of tank cover（7）It is interior, two interfaces are provided with the cover, an interface passes through pipeline
（17）With degasser（5）, methane aerating device（21）Connected with modeled pressure drop desorption apparatus, another interface installation pressure gauge
And thermometer（24）, the incubator（7）Connect heater（23）；Described degasser（5）The vacuum connected by pipeline
Pump（25）, valve（4）With coal sample tank（6）It is connected on pipeline；Described methane aerating device（21）By being connected successively by pipeline
The valve connect（3）, surge tank（1）, pressure gauge（26）, methane gasing tank（2）Composition.
Need to detect air-tightness and closing that surface drilling coring coal core gas misses simulating test device before use device
All valves；
In coal sample tank（6）In be put into dried coal sample, regulating thermostatic water bath（7）Temperature be coal seam temperature by coal sample tank
（6）It is placed in water bath with thermostatic control, it is ensured that each valve is closed, and opens vavuum pump（25）And valve（4）, to coal sample tank
（6）Vacuum outgas, pressure inside the tank is monitored with compound vacuum gauge, when pressure inside the tank to 10Pa, is then shut off valve（4）And vavuum pump
（25）, complete the degassing process to coal sample tank and connected pipeline；
Ensure that each valve is closed, open methane gasing tank（2）To with reference to tank（1）In be filled with methane, pressure stability
Recording manometer afterwards（26）Pressure P0（Refer to the pressure of tank 1）, close gasing tank（2）, open valve（3）, filled into coal sample tank
Enter a certain amount of methane gas, close valve（3）Record refers to tank（1）Pressure gauge（26）Reading P1 ,；Above-mentioned inflation is repeated several times
Process, make coal sample tank（6）In coal sample reach adsorption equilibrium pressure（Close valve（3）Pressure gauge afterwards（24）Reading no longer becomes
Turn to only）, i.e. adsorption equilibrium pressure is P1；
To slurry tank（12）Middle addition mud so that the mud added occupies slurry tank（12）One half space, open valve
（11）, pass through nitrogen gasing tank（9）To surge tank（10）A certain amount of nitrogen is filled with, closes nitrogen pot（9）After open valve
（11）, to slurry tank（12）Nitrogen is passed through, treats pressure gauge（28）Valve is closed after stable（11）；So that pressure gauge（28）Display
Pressure value is coal sample local environment pressure P before sampling0；Open valve（8）, coal sample is solved in the case where simulating actual pressure drop curve
Inhale.
A kind of surface drilling coring coal core gas misses analog detection method, carries out as follows：
Step1. prepared by coal sample：After the fresh lump coal collected/beans is crushed, the coal sample of certain particle diameter is sieved into, is divided into
More parts of amount, are put into drying process in drying box；
Step2. vacuum outgas：The drying coal sample loading coal sample tank that will be handled well, sets the temperature of insulating box as coal seam temperature, uses
Degasser is to coal sample tank vacuum outgas；
Step3. adsorption equilibrium：According to required adsorption equilibrium pressure, a certain amount of methane is filled with, after balance to be adsorbed, record
The actual adsorption equilibrium pressure P of pressure gauge1；
Step4. modeled pressure drop desorbs：Simulation coal sample local environment pressure P before sampling0, pass through nitrogen aerating device（22）To
Slurry tank（12）In be filled with nitrogen adjustment slurry tank（12）Interior pressure, reach predetermined pressure P0；Pass through computer（14）Control
Back pressure servo-drive system processed（13）Make slurry tank（12）The pressure drop harmonic curve of the interior pressure P simulations actual sampling process of coal sample reduces,
When P is equal to P1, coal sample tank（6）Middle coal containing methane gas starts to desorb gas, slurry tank（12）Interior pressure continues simulation, and coal sample is actual takes
The pressure drop harmonic curve of sample process reduces, and coal sample continues desorption of mash gas；
Step5. gas collection process：By slurry tank（12）Middle discharge gas（Most start to be changed into the mixed of nitrogen and methane after nitrogen
Close gas）Into desorption of mash gas instrument（15）；
Step6. data analysis：In experimentation, slurry tank（12）The pressure of the interior actual sampling process of pressure simulation coal sample reduces
Curve reduces, by computer（14）Record desorption of mash gas instrument（15）Middle gas volume V1And sensor（30）The temperature T of collection, surpass
Sound-ranging equipment（29）The water-column h and methane concentration C data measured is by computer（14）Data analysis is carried out by formula to obtain
Desorption of mash gas data when going out coal containing methane gas pressure continuously reducing in mud medium.
The calculation formula tested using apparatus of the present invention and method is as follows：
Desorption of mash gas instrument（15）Interior gas pressure is P；
（1）
P in formula1:Ambient pressure residing for experimental provision, Pa；
ρ:The density of water in desorption of mash gas instrument, kg/m3；
h:Water-column in desorption of mash gas instrument, m；
Desorption of mash gas instrument（15）The volume V of the gas being collected into normal conditions0, obtained by The Ideal-Gas Equation：
（2）
V in formula0:The volume of the gas being collected into normal conditions, m3；
V:The volume of gas, m in desorption of mash gas instrument3；
T0:Normal temperature, K；
T:Gas temperature in desorption of mash gas instrument, K；
The volume V of the methane desorbedMethaneCalculated by formula 3；
C in formula:The methane concentration of gas, % in desorption of mash gas instrument.
In summary, by the description of the present embodiment, those skilled in the art can be made preferably to implement this programme.
Claims (3)
- A kind of 1. surface drilling coal core modeled pressure drop desorption apparatus, it is characterised in that：Nitrogen including being sequentially connected with pipeline fills Device of air（22）, closed slurry tank（12）, back pressure servo-drive system（13）, desorption of mash gas instrument（15）；The nitrogen aerating device（22）Including being sequentially connected valve by pipeline（11）, surge tank（10）, pressure gauge（27）, nitrogen Gas gasing tank（9）；The back pressure servo-drive system（13）By counterbalance valve（1301）, accumulator（1302）, pressure gauge（1303）With PID valves（1304） Composition；The desorption of mash gas instrument（15）Equipped with methane concentration analyzer（20）, ultrasonic range finder（29）And temperature sensor （30）.
- 2. a kind of surface drilling coring coal core gas leakage simulating test device comprising claim 1 described device, its feature It is：Also include coal sample tank（6）, degasser（5）, methane aerating device（21）And computer（14）, the coal sample tank（6）With Sealing of tank cover is arranged on incubator（7）It is interior, two interfaces are provided with the cover, an interface passes through pipeline（17）With degassing Device（5）, methane aerating device（21）Connected with modeled pressure drop desorption apparatus, another interface installation pressure gauge and thermometer （24）, the incubator（7）Connect heater（23）；Described degasser（5）The vavuum pump connected by pipeline（25）, valve Door（4）With coal sample tank（6）It is connected on pipeline；Described methane aerating device（21）By the valve being sequentially connected by pipeline （3）, surge tank（1）, pressure gauge（26）, methane gasing tank（2）Composition.
- 3. a kind of usage right requires the surface drilling coring coal core gas leakage analog detection method of 2 described devices, its feature It is, carries out as follows：Step1. prepared by coal sample：After the fresh lump coal collected/beans is crushed, the coal sample of certain particle diameter is sieved into, is divided into More parts of amount, are put into drying process in drying box；Step2. vacuum outgas：The drying coal sample loading coal sample tank that will be handled well, sets the temperature of insulating box as coal seam temperature, uses Degasser is to coal sample tank vacuum outgas；Step3. adsorption equilibrium：According to required adsorption equilibrium pressure, a certain amount of methane is filled with, after balance to be adsorbed, record The actual adsorption equilibrium pressure P of pressure gauge1；Step4. modeled pressure drop desorbs：Simulation coal sample local environment pressure P before sampling0, pass through nitrogen aerating device（22）To Slurry tank（12）In be filled with nitrogen adjustment slurry tank（12）Interior pressure, reach predetermined pressure P0；Pass through computer（14）Control Back pressure servo-drive system processed（13）Make slurry tank（12）The pressure drop harmonic curve of the interior pressure P simulations actual sampling process of coal sample reduces, When P is equal to P1, coal sample tank（6）Middle coal containing methane gas starts to desorb gas, slurry tank（12）Interior pressure continues simulation, and coal sample is actual takes The pressure drop harmonic curve of sample process reduces, and coal sample continues desorption of mash gas；Step5. gas collection process：By slurry tank（12）Middle discharge gas（Most start to be changed into the mixed of nitrogen and methane after nitrogen Close gas）Into desorption of mash gas instrument（15）；Step6. data analysis：In experimentation, slurry tank（12）The pressure of the interior actual sampling process of pressure simulation coal sample reduces Curve reduces, by computer（14）Record desorption of mash gas instrument（15）Middle gas volume V1And sensor（30）The temperature T of collection, surpass Sound-ranging equipment（29）The water-column h and methane concentration C data measured is by computer（14）Data analysis is carried out by formula to obtain Desorption of mash gas data when going out coal containing methane gas pressure continuously reducing in mud medium.
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Cited By (7)
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| CN110108850A (en) * | 2019-05-30 | 2019-08-09 | 河南理工大学 | A kind of coal-bed gas pressure test macro and method based on drilling sampling actual measurement |
| CN110196206A (en) * | 2019-05-15 | 2019-09-03 | 中国矿业大学 | A kind of more gas competitive Adsorption test devices of Residual coal in goaf and its application method |
| CN110608987A (en) * | 2019-09-30 | 2019-12-24 | 华北理工大学 | Coal sample adsorption device and method for coal seam permeability determination experiment |
| CN112924354A (en) * | 2021-01-22 | 2021-06-08 | 西南石油大学 | Shale reservoir stress sensitivity experiment evaluation method based on gas diffusion coefficient |
| CN113063621A (en) * | 2021-02-26 | 2021-07-02 | 中国地质大学（北京） | Coal reservoir coring and gas content measurement simulation device and working method thereof |
| CN114894659A (en) * | 2022-03-29 | 2022-08-12 | 安徽理工大学 | Method for precisely adjusting negative pressure and testing gas desorption amount in negative pressure coring environment |
| CN115980302A (en) * | 2022-12-19 | 2023-04-18 | 安徽理工大学 | Device for testing gas desorption efficiency of physically-simulated microorganism-enhanced coal bed |
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| CN110196206A (en) * | 2019-05-15 | 2019-09-03 | 中国矿业大学 | A kind of more gas competitive Adsorption test devices of Residual coal in goaf and its application method |
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| CN110608987A (en) * | 2019-09-30 | 2019-12-24 | 华北理工大学 | Coal sample adsorption device and method for coal seam permeability determination experiment |
| CN112924354A (en) * | 2021-01-22 | 2021-06-08 | 西南石油大学 | Shale reservoir stress sensitivity experiment evaluation method based on gas diffusion coefficient |
| CN112924354B (en) * | 2021-01-22 | 2022-09-20 | 西南石油大学 | Shale reservoir stress sensitivity experiment evaluation method based on gas diffusion coefficient |
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| CN113063621B (en) * | 2021-02-26 | 2022-05-17 | 中国地质大学（北京） | Coal reservoir coring and gas content measurement simulation device and working method thereof |
| CN114894659A (en) * | 2022-03-29 | 2022-08-12 | 安徽理工大学 | Method for precisely adjusting negative pressure and testing gas desorption amount in negative pressure coring environment |
| CN114894659B (en) * | 2022-03-29 | 2024-04-12 | 安徽理工大学 | Method for testing gas desorption amount in negative pressure coring environment by precisely adjusting negative pressure |
| CN115980302A (en) * | 2022-12-19 | 2023-04-18 | 安徽理工大学 | Device for testing gas desorption efficiency of physically-simulated microorganism-enhanced coal bed |
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