CN108509664A - It is a kind of based on negative pressure adjusted and controlled coal mine gas pumping method - Google Patents
It is a kind of based on negative pressure adjusted and controlled coal mine gas pumping method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 86
- 238000005086 pumping Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000000605 extraction Methods 0.000 claims abstract description 41
- 238000001179 sorption measurement Methods 0.000 claims description 20
- 238000003795 desorption Methods 0.000 claims description 17
- 238000002336 sorption--desorption measurement Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
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- 230000035899 viability Effects 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 7
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- 239000003463 adsorbent Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000004166 bioassay Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
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- 238000001816 cooling Methods 0.000 description 1
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- 230000007717 exclusion Effects 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/20—Design optimisation, verification or simulation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
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- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention discloses a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, by the negative pressure adjusted and controlled efficient extraction for realizing coal mine gas during gas pumping.Following effect can reach using the negative pressure adjustment scheme after optimization：1, underground gas extraction concentration and extraction scale are improved；2, extraction efficiency is improved；3, drilling CO concentration is reduced；4, the extraction borehole viability is extended.
Description
Technical field
The invention belongs to the gas pumping technical fields of underground coal mine exploitation, are related to a kind of based on negative pressure adjusted and controlled coal mine
Lower gas pumping method, the negative pressure for being suitable for underground gas extraction system and drilling are adjusted.
Background technology
During coal-bed gas is taken out at present, the general basis of extraction negative pressure《Coal mine gas drainage temporary provisions up to standard》It determines,
Lack theoretical foundation and specific aim, is not associated with condition of coal seam occurrence, coal seam mechanical property, hole sealing depth and quality more.
There are following prominent questions：1. hole pumping and mining negative pressure is excessive, borehole wall country rock is damaged, part seriously unfavorable to borehole stability
Generate gas leak phenomenon；2. under conditions of aperture is certain, hole pumping and mining negative pressure is excessive, and aerodynamic energy increases, and drives coal dust in hole
High density pulverized coal flow is formed, original extraction channel is blocked, reduces extracting result；3. hole pumping and mining negative pressure is excessive, high velocity stream in hole
Dynamic pulverized coal particle, air particles and hole wall generates strong collision, and temperature in borehole constantly rises, and causes some potential safety problems；
4. hole pumping and mining negative pressure is too small, then it cannot directly extract estimated gas amount out, seriously affect gas pumping effect.
Therefore, Proper Match extraction negative pressure improves gas pumping effect key technology research to effectively improving pit mining coal
The gas pumping effect of layer, forming rational gas pumping pattern has important theory directive significance and practical value.
Invention content
The present invention is in view of the above-mentioned problems, research is a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, by right
The negative pressure adjusted and controlled efficient extraction for realizing coal mine gas during gas pumping.
Technical solution is as follows：
It is a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, including：
1) adsorption-desorption gas amount of the coal sample test underground coal mine different coal under different condition of negative pressure is taken at any time
Situation of change draws coal sample adsorption-desorption curve；
2) according to coal sample adsorption-desorption curve, the suction of the distance between every two data point and each data point both sides is calculated
Attached amount spread, the comparison relatively small point of spread is inflection point, reasonable using the range of negative pressure between two inflection points as the coal seam
Extraction range of negative pressure；
3) time t is determined according to coal sample adsorption time, at the initial stage of gas pumping, without using negative pressure (desorption naturally) or
Extraction is carried out using lower negative pressure (negative pressure is less than 5kPa)；After the t times, then the choosing out of step 2) determines extraction range of negative pressure
It selects negative pressure as high as possible and carries out extraction.
Further, the distance between every two data point is calculated by the following formula in step 2)：
Wherein, A (x1,y1), B (x2,y2) refer in euclidean geometry space, two on the adsorption-desorption curve that is set in plane
Data point, dimensionless.
Further, the adsorbance spread of any data point both sides is calculated by the following formula in step 2)：
δ=(yi﹣ yi+1) ﹣ (yi‐1﹣ yi)
Wherein, δ refers to adsorbance spread, yi、yi+1、yi‐1Refer respectively to data point i and its data point i+1 and i- of both sides
1 absorption magnitude.
Further, rational extraction range of negative pressure is 10~35kpa in step 2).
Further, in step 3), coal sample adsorption time is defined as actual measurement desorption gas volume and has reached total air content
(STP:Normal temperature, pressure) 63.2% when corresponding time (《Coalbed gas geology》, publishing house of China Mining University
2009-05-01 is published).
Further, in step 3), time t is the average value in coal sample adsorption time section.
Further, in step 3), time t is generally 7 days.
Further, in step 3), according to extraction system ability, sealing quality etc. from step 2) determine extraction negative pressure model
Enclose interior selection negative pressure as high as possible.But in the case of extraction borehole sealing quality is general, high negative pressure should not be used, to prevent
Drill gas leakage.
Following effect can reach using the negative pressure adjustment scheme after optimization：1, underground gas extraction concentration and extraction are improved
Scale；2, extraction efficiency is improved；3, drilling CO concentration is reduced；4, the extraction borehole viability is extended.
Description of the drawings
The structural schematic diagram of the gas adsorption used in Fig. 1 embodiments-desorption experiment measurement system, wherein 1-high pressure
Gas cylinder, 2-shut-off valves, 3-threeways, 4-four-ways, 5-vacuum meters, 6-vacuum pumps, 7-pressure gauges, 8-coal sample tanks, 9-is permanent
Tepidarium, 10-water-baths, 11-big graduated cylinders, 12-flow stabilizing valves, 13-globe valves, 14-flowmeters, vacuum that 15-negative pressure are adjustable
Pump, 16-computers.
Fig. 2 is the result figure verified to the gas pumping range of negative pressure after regulation and control in embodiment.
Specific implementation mode
Embodiment
By taking the main mining coal seam fourth group in Pingdingshan Coal Mine, penta group, oneself group coal sample as an example.
Coal sample collection and processing：According to experiment purpose and requirement of the experimental method to coal sample, desorption of mash gas process measures institute
It must be the coal wall acquisition of fresh exposure with coal sample, then coal sample is quickly charged in sealed volume and is sealed, with anti-oxidation, and to the greatest extent
Express delivery is to making in laboratory coal sample sample.
Prepare test sample：It takes appropriate coal sample to crush, crosses standard screen and (can voluntarily be selected according to experimental design, originally
The apertures 0.2mm~0.25mm are used in embodiment), it takes the lower particle of sieve to be fitted into sealing in port grinding bottle and endorses for use, set according to experiment
Meter prepares multiple coal sample samples, and each example weight should not be less than 100g.It is small that the heating 2 under the conditions of 105 DEG C is placed in dryer
When, coal sample is put into the container with air exclusion after cooling and is sealed for use.
Determine rational extraction range of negative pressure：According to coal sample adsorption-desorption curve, the distance between every two data point is calculated
And the adsorbance spread of each data point both sides, the comparison relatively small point of spread is inflection point, between two inflection points
Range of negative pressure is as the rational extraction range of negative pressure in the coal seam.
In euclidean geometry space, in plane, if A (x1,y1), B (x2,y2) 2 points, then the distance between 2 points it is as follows：
Line can be calculated with y-axis angle with following formula between two data points：
The adsorbance spread of any data point both sides calculates as follows：
δ=(yi﹣ yi+1) ﹣ (yi‐1﹣ yi)
1 coal bed gas extraction negative pressure of table determines
According to the distance between two data points and the adsorbance spread of each data point both sides, determine in inflection point such as table 1
Shown in overstriking font.
Then the range of negative pressure between two inflection points is determined as coal bed gas extraction range of negative pressure again, finally determining coal
The rational gas pumping range of negative pressure of layer is as shown in table 2 (1. 2. 3. 4. 5. taking 5 coal sample numbers by each coal seam).
The rational gas pumping range of negative pressure in 2 coal seam of table
Wherein, fourth group coal is 10-30kPa, and penta group of coal is 15-35kPa, oneself group coal is 15-35kPa.
According to design and the function to be realized, on the basis of experimental system is determined in the measurement of the methane adsorption of coal, design machined
A set of gas adsorption-desorption experiment measurement system.The design drawing of this system as shown in Figure 1, whole system mainly by vacuum outgas
Unit (for complete coal sample experiment initial vacuum degassing), adsorption equilibrium unit (adsorption equilibrium for completing coal sample device in Gas),
Constant temperature unit (coal sample in coal sample tank can be made to adsorb and keep constant temperature in desorption process, it is real by water-bath and ultra thermostat
It is existing) and subnormal ambient desorption of mash gas determination unit (being measured mainly for coal sample desorption of mash gas process simulation under subnormal ambient) four
It is grouped as.It specifically includes：
Main pipe rail,
The gas cylinder 1 for gas supply, the pipe between gas cylinder 1 and threeway 3 are connected on main pipe rail by threeway 3
Shut-off valve 2 is installed on road；
Adsorbent equipment, including water bath with thermostatic control 9 and the coal sample tank 8 that is placed in water bath with thermostatic control 9, on the air inlet of coal sample tank 8
Equipped with pressure gauge 7, above-mentioned adsorbent equipment is connected to by threeway on main pipe rail；
Vacuum plant, including vacuum meter 5, vacuum pump 6 and the branch's connecting tube being connected with main pipe rail, in vacuum meter 5
With shut-off valve is respectively provided on vacuum pump 6, one end of branch's connecting tube passes through four-way 4 and vacuum meter 5, vacuum pump 6 and air inlet pipe
Connection, the other end are connected by threeway 3 with main pipe rail, and shut-off valve is mounted in air inlet pipe and branch's connecting tube；
Negative pressure drainage device, including the adjustable vacuum pump 15 of negative pressure, flowmeter 14 and computer 16, the air inlet of flowmeter 14
Mouth is connected to by threeway 3 on main pipe rail, which is equipped with globe valve 13, and the outlet of flowmeter 14 is then adjustable true with negative pressure
15 connection of sky pump；
Emission-control equipment, including water-bath 10 and the big graduated cylinder 11 that is inverted in water-bath 10, the emission-control equipment pass through
Threeway 3 is connected with adsorbent equipment, vacuum plant and the negative pressure drainage device on main pipe rail, in the air inlet communicated with main pipe rail
It is upper that shut-off valve and flow stabilizing valve 12 are housed.
The gas flowmeter that determination unit uses meets bioassay standard：GB/T 32201-2015 gas flowmeters.
Whole system carries out gas adsorption-desorption experiment according to following three steps and measures：Coal sample vacuumizes, coal sample is being set
Reach adsorption saturation under fixed pressure and temperature, coal sample is desorbed under the negative pressure of setting.
1) coal sample vacuumizes：
All valves are closed first, the drying coal sample prepared is put into coal sample tank 8, coal sample tank 8 is tightened, by coal sample
Tank 8 is put into water bath with thermostatic control 9, and regulating thermostatic water-bath 9 makes temperature at 99 DEG C, opens branch's connecting tube, vacuum meter 5 and vacuum pump 6
On shut-off valve, open vacuum pump 6 and coal sample vacuumized, observe vacuum meter 5, the measured value of gauge 5 reaches 20Pa
When, then it is assumed that it is evacuated, vacuum pump 6 is closed, closes the cut-off in vacuum pump 6, vacuum meter 5 and branch's connecting tube successively
Valve opens the shut-off valve in air inlet pipe.
2) coal sample reaches adsorption saturation under the pressure and temperature of setting：
The temperature of regulating thermostatic water-bath 9 makes its temperature between 20 DEG C~99 DEG C, opens gas cylinder 1, gas is made to enter
Main pipe rail, according to the reading of pressure gauge 7, the air pressure i.e. the blowing pressure that goes out for adjusting gas cylinder 1 (pressure 15MPa in bottle) is maintained at
Between 0.1MPa~13MPa.
3) coal sample is desorbed under the negative pressure of setting：
The shut-off valve on emission-control equipment air inlet is opened, regulating flow-stabilizing valve 12 makes gas steadily pass through water-bath 10, stream
Enter the big graduated cylinder 11 of gas collection, observe pressure gauge 7, when reading is 0, closes the shut-off valve, open globe valve 13, open negative pressure
Adjustable vacuum pump 15, after reaching default negative pressure value (0~100kpa), the discharge record opened in flowmeter 14 and computer 16 is soft
Part automatically records negative pressure mash gas extraction flow, after negative pressure value, which continues 20min, is less than default negative pressure value, it is believed that negative pressure solution sucks
At closing discharge record software, globe valve 13 and the adjustable vacuum pump of negative pressure 15 successively.Difference is can be obtained according to the flow of record
Corresponding desorption quantity under negative pressure.
Experimental result is as shown in Figure 2.
By Fig. 2 it will be evident that load negative pressure is much bigger compared to the desorption quantity of normal pressure desorption, but load 10kPa,
The desorption quantity difference of 20kPa, 30kPa, 40kPa are smaller.Especially 30kPa, 40kPa negative pressure desorption quantity difference is very small.Explanation
It is not proportional relation between negative pressure and desorption quantity, in desorption process after negative pressure load to a certain extent, desorption quantity is almost unchanged.
It is negative pressure adjusted and controlled：
During gas pumping, the too fast influence of rate of pressure reduction leads to country rock spontaneous load and brittle break occurs, production
Raw a large amount of coal dusts, coal dust can filling fractures.Variation by rationally controlling rate of pressure reduction can be such that reservoir penetrating power constantly carries
Height is maintained in higher level.Therefore, it using lower negative pressure (5kpa or less) or can not be used at gas pumping initial stage
Negative pressure extraction is adjusted to higher negative pressure (high value in reasonable range of negative pressure) after the t times (generally 7 days) and is taken out again
It adopts, the time, t was determined according to adsorption time, was the average value in adsorption time section.
Adsorption time is defined as actual measurement desorption gas volume and has reached total air content (STP:Normal temperature, pressure)
Corresponding time when 63.2%.Adsorption time can react the speed that gas is migrated in matrix, can also embody the diffusion of gas
Ability.
3. main coal seam adsorption time table of table
As shown in table 3, the adsorption time of research area's gas is between 0.28~11.67d.Adsorption time and gas pumping
The time that flow peaks is related, not close with long-term extraction magnitude relation.Adsorption time is short, it is likely that reaches in a short time
To the peak of gas extraction flow.
By to adjust front and back each 1 month field monitoring, calculation shows that：Using the negative pressure adjustment scheme after optimization than excellent
Following effect is reached before change：1, underground gas extraction single hole mean concentration and extraction scale respectively by before optimizing 40%,
3m3/ d is increased to 55%, 4m3/ d, improves 20% or more；2, extraction reaching standard time was reduced to 4.5 by 6 months before optimizing
Month, extraction efficiency improves 25%；3, drilling CO concentration is reduced with negative pressure and is reduced；4, the extraction borehole viability is by 10~15
It increases to 3 months or more.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, the ordinary skill of this field
Personnel can be modified or replaced equivalently technical scheme of the present invention, without departing from the spirit and scope of the present invention, this
The protection domain of invention should be subject to described in claim.
Claims (9)
1. it is a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, including：
1) adsorption-desorption gas amount of the coal sample test underground coal mine different coal under different condition of negative pressure is taken to change with time
Situation draws coal sample adsorption-desorption curve；
2) according to coal sample adsorption-desorption curve, the distance between every two data point and the adsorbance of each data point both sides are calculated
Spread, the comparison relatively small point of spread is inflection point, is reasonably taken out as the coal seam using the range of negative pressure between two inflection points
Adopt range of negative pressure；
3) time t is determined according to coal sample adsorption time, at the initial stage of gas pumping, without using negative pressure or uses lower negative pressure
Carry out extraction；After the t times, then selection negative pressure as high as possible carries out extraction out of step 2) determines extraction range of negative pressure.
2. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
2) the distance between every two data point is calculated by the following formula in：
Wherein, A (x1,y1), B (x2,y2) refer to two data on the adsorption-desorption curve that is set in plane in euclidean geometry space
Point.
3. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
2) the adsorbance spread of any data point both sides is calculated by the following formula in：
δ=(yi﹣ yi+1) ﹣ (yi‐1﹣ yi)
Wherein, δ refers to adsorbance spread, yi、yi+1、yi‐1Refer respectively to the suction of data point i and its data point i+1 and i-1 of both sides
Attached magnitude.
4. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
2) rational extraction range of negative pressure is 10~35kpa in.
5. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
3) in, when coal sample adsorption time is defined as actual measurement desorption gas volume and has reached corresponding when the 63.2% of total air content
Between.
6. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
3) in, time t is the average value in adsorption time section.
7. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
3) in, time t is 7 days.
8. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
3) in, lower negative pressure is the negative pressure less than 5kPa.
9. as described in claim 1 a kind of based on negative pressure adjusted and controlled coal mine gas pumping method, which is characterized in that step
3) in, as high as possible bear is selected out of step 2) determines extraction range of negative pressure according to extraction system ability and sealing quality
Pressure.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59127630A (en) * | 1983-01-12 | 1984-07-23 | Babcock Hitachi Kk | Desorption of sulfur oxide |
| CN103776722A (en) * | 2013-12-31 | 2014-05-07 | 河南理工大学 | Testing method for content of coal seam methane sampled under negative-pressure environment |
-
2017
- 2017-02-24 CN CN201710103799.0A patent/CN108509664A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59127630A (en) * | 1983-01-12 | 1984-07-23 | Babcock Hitachi Kk | Desorption of sulfur oxide |
| CN103776722A (en) * | 2013-12-31 | 2014-05-07 | 河南理工大学 | Testing method for content of coal seam methane sampled under negative-pressure environment |
Non-Patent Citations (1)
| Title |
|---|
| 王满 等: "基于吸附解吸实验的煤层瓦斯抽采负压调整方案研究", 《煤炭.青年.创新.未来》 * |
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Application publication date: 20180907 |