CN102587958A - Method for mining coal seam gas - Google Patents
Method for mining coal seam gas Download PDFInfo
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- CN102587958A CN102587958A CN2012100603090A CN201210060309A CN102587958A CN 102587958 A CN102587958 A CN 102587958A CN 2012100603090 A CN2012100603090 A CN 2012100603090A CN 201210060309 A CN201210060309 A CN 201210060309A CN 102587958 A CN102587958 A CN 102587958A
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Abstract
The invention discloses a method for mining coal seam gas, belonging to the field of coal seam gas mining. The method comprises the steps of: drilling a gas injection hole downwards from the ground; injecting gas into the gas injection hole; displacing the coal seam gas by the injected gas; drilling an underground pumping hole; and pumping the coal seam gas from the underground pumping hole. Through the method provided by the invention, the gas injection has a large influence range, effects are exerted on adjacent and non-adjacent drilled holes, and the coal seam gas in coal seams can be displaced to ensure that the coal seam gas adsorbed on the inner surfaces of coal matrix holes are changed from an adsorbed state to a detached state, so that the pumping effect of the coal seam gas is improved.
Description
Technical field
The invention belongs to the method for exploiting coal bed methane.
Background technology
At present, the method for exploiting coal bed methane generally adopts two kinds of methods of ground drilling extraction and down-hole drilling extraction.
The ground drilling extraction, the production cycle is long, and the speed that gas bearing capacity reduces is slow; The down-hole drilling extraction, rig does not reach requirement, causes the hole of collapsing easily.
When coal seam pressure was lower than the critical abandonment pressure of coal bed gas, above-mentioned two kinds of methods all can't be with coal bed gas produced.
In sum, the gas pumping rate of the method for existing exploiting coal bed methane is low, the extraction weak effect.
Summary of the invention
The present invention proposes the method for the higher gas injecting mining coal bed gas of a kind of gas pumping rate.
Technical scheme of the present invention is: to the underground drilling injecting hole, injecting gas in injecting hole uses the gas that injects with the coal bed gas displacement on ground; Bore the extraction hole in the down-hole, coal bed gas extraction from the aspirating hole of down-hole is come out.
Described in injecting hole injecting gas be carbon dioxide or nitrogen gas, the pressure of injecting gas is 7-15MPa, the flow of injecting gas is 3-7.5m
3/ min;
The aperture of described injecting hole is 139.7mm;
Described injecting hole be and aspirating hole between be 90 ° of angles;
Described injecting hole is perpendicular to the ground.
The size that quantity and coal work zone is set of described injecting hole is relevant, and the regional radius of coal work is that 150 meters scope is provided with 1 injecting hole, and described aspirating hole aperture is 89mm;
Described aspirating hole is 1;
Described aspirating hole is a directional drilling; Be that the horizontal orientation long drilled holes is the boring that multiple-limb hole construction can be controlled, can be carried out to a kind of track in real time under the coal mine, but have the drilling efficiency height, effectively high, the hole of extraction distance, gas pumping efficient many with and large tracts of land concentrate advantages such as extraction.
The boring method of described injecting hole is: one spuds in to the following 10m of stable basement rock, uses well cementing of cement; Two 10-30m to the working seam top that spud in use well cementing of cement; Three spud in to the following 5-15m finishing drilling of seat earth.
Finishing drilling---be that drilling well has reached the intended purposes of desired depth and construction and finishes to creep into.
The position of described injecting hole is at least 350 meters borings of horizontal range apart from the underworkings development end;
The position of described aspirating hole is on the underworkings wall, uses directional drilling machine, drills towards the injecting hole direction, makes it reach the purpose of efficient extraction.
Said aspirating hole communicates with displacement displacement influence basin;
Said displacement displacement influence basin is meant the carbon dioxide of injection or the distance of nitrogen horizontal direction migration in the coal seam, shows that according to coal bed gas well pressure break monitored data this distance is a 50-200 rice.
The position of described injecting hole is apart from least 150 meters of aspirating hole horizontal ranges.
Well spacing refers to the position of selecting well-digging.Inter-well distance refers to the horizontal range between well and the well.
Said injecting hole is connected with nitrogen or carbon dioxide pump truck; Aspirating hole is connected with exhaust tube.
Effect of the present invention have following some:
1, breaks through the extraction of traditional coal seam gas and received the complicated influence that restricts of geological structure;
2, the influence basin of gas injection is big; Not only adjacent boring, non-conterminous boring are all produced effect; Can also the displacement of the coal bed gas in the coal seam be made the coal bed gas that is adsorbed on the matrix of coal internal pore surface change free state into by adsorbed state, thereby improve the extraction effect of coal bed gas;
3, through down-hole negative pressure extraction, the directly extensive desorb of Rapid Realization coal bed gas has solved the problem that the ground extraction exploiting coal bed methane cycle is long, the gas desorption rate is low;
4, the aspirating hole of breaking through is carried out shutoff, force injecting gas to turn to, the coal bed gas near the coal seam aspirating hole is carried out twice replaced, increased the sweep area of injecting gas, prolonged time swap, and then improved the extraction effect of coal bed gas;
5, in the Coal Production district that implements the preparatory extraction coal bed gas of ground drilling, can select ground to take out well in advance and implement ground injecting gas down-hole extraction according to down-hole mining speed, realize more easily on the engineering, for the coal bed gas secondary recovery provides technical support;
Say from security standpoint that 6, the present invention can directly reduce near the gas density the mine, the harm of effectively avoiding gas to cause to people.
The specific embodiment
Embodiment one:
1, on ground to 1 injecting hole of underground drilling; The aperture of injecting hole is 139.7mm; It is 400 meters borings of horizontal range that the position of injecting hole is positioned at apart from the underworkings development end, and the boring method of injecting hole is: one spuds in to the following 10m of stable basement rock, uses well cementing of cement; Two 10-30m to the working seam top that spud in use well cementing of cement; Three spud in to the following 5-15m finishing drilling of seat earth.
2, injecting hole connects the carbon dioxide pump truck; The carbon dioxide pump truck is provided with gas pressure monitoring device and gas flow monitoring device;
3, to the injecting hole injecting carbon dioxide, the flow of carbon dioxide is 4.5 m
3/ min, the pressure of carbon dioxide is 7MPa;
4, bore 1 aspirating hole in the down-hole, the aperture of this aspirating hole is 89mm, and the position of aspirating hole is positioned on the underworkings wall, and aspirating hole is connected with exhaust tube;
5, gas flow monitoring device, coal bed gas concentration monitor device and negative pressure monitoring device are set on the exhaust tube;
6, the monitoring exhaust tube gas flow, coal bed gas concentration and negative pressure data, when gas flow less than 2.55 m
3/ min, coal bed gas concentration be less than 25% or negative pressure during greater than 40KPa, this aspirating hole of shutoff.
Embodiment two:
The gas that injects in the injecting hole of present embodiment is nitrogen, and other step and parameter are identical with embodiment one.
Claims (9)
1. the method for an exploiting coal bed methane is characterized in that on ground to the underground drilling injecting hole, injecting gas in injecting hole, with the gas that injects with the coal bed gas displacement; Bore the extraction hole in the down-hole, coal bed gas extraction from the aspirating hole of down-hole is come out.
2. the method for a kind of exploiting coal bed methane according to claim 1 is characterized in that the gas that injects in the described injecting hole is nitrogen, and the pressure of nitrogen injection is 7-15MPa, and the flow of nitrogen injection is 3-7.5m
3/ min.
3. the method for a kind of exploiting coal bed methane according to claim 1 is characterized in that the gas that injects in the described injecting hole is carbon dioxide, and the pressure of injecting carbon dioxide is 7-15MPa, and the flow of injecting carbon dioxide is 3-7.5m
3/ min.
4. the method for a kind of exploiting coal bed methane according to claim 1, the aperture that it is characterized in that described injecting hole is 139.7mm, the aperture of described aspirating hole is 89mm; Described injecting hole is 1, and said aspirating hole is 1.
5. the method for a kind of exploiting coal bed methane according to claim 1 is characterized in that being between described injecting hole and the aspirating hole 90 ° of angles, and the position of described injecting hole is apart from least 150 meters of aspirating hole horizontal ranges.
6. the method for a kind of exploiting coal bed methane according to claim 1 is characterized in that described injecting hole is perpendicular to the ground.
7. the method for a kind of exploiting coal bed methane according to claim 1, it is characterized in that the boring method of described injecting hole is: one spuds in to the following 10m of stable basement rock, uses well cementing of cement; Two 10-30m to the working seam top that spud in use well cementing of cement; Three spud in to the following 5-15m finishing drilling of seat earth.
8. the method for a kind of exploiting coal bed methane according to claim 1, the position that it is characterized in that described injecting hole are to be at least 350 meters borings of horizontal range apart from the underworkings development end; The position of described aspirating hole is on the underworkings wall, uses directional drilling machine, drills towards the injecting hole direction.
9. the method for a kind of exploiting coal bed methane according to claim 1 is characterized in that said aspirating hole communicates with displacement displacement influence area; Said displacement displacement influence area is meant the carbon dioxide of injection or the distance that nitrogen is migrated in the down-hole horizontal direction, and this distance is a 50-200 rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100603090A CN102587958A (en) | 2012-03-09 | 2012-03-09 | Method for mining coal seam gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100603090A CN102587958A (en) | 2012-03-09 | 2012-03-09 | Method for mining coal seam gas |
Publications (1)
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|---|---|
| CN102587958A true CN102587958A (en) | 2012-07-18 |
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| CN2012100603090A Pending CN102587958A (en) | 2012-03-09 | 2012-03-09 | Method for mining coal seam gas |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234737A (en) * | 2013-06-21 | 2014-12-24 | 肖栋 | Enzymolysis-boosted coal-seam methane desorption technique and method |
| CN104314609A (en) * | 2014-09-28 | 2015-01-28 | 太原理工大学 | Alternate cooling and heating yield increasing method for gas extraction bored well |
| CN104696005A (en) * | 2015-02-03 | 2015-06-10 | 太原理工大学 | Method for synchronously extracting residual coalbed methane and sealing and preserving carbon dioxide in old mined-out area of coal mine |
| CN104989339A (en) * | 2015-08-04 | 2015-10-21 | 太原理工大学 | Old goaf coalbed methane extracting and mining system and method |
| CN105138029A (en) * | 2015-08-03 | 2015-12-09 | 陈信平 | Program and method for controlling pressure of nitrogen injection production increase coal bed gas |
| CN105986835A (en) * | 2015-02-17 | 2016-10-05 | 王跃平 | Method for extracting gas in coal seam |
| CN106121604A (en) * | 2016-06-27 | 2016-11-16 | 中国矿业大学 | One utilizes CO2coal-bed gas and the method for residual gas is driven away with modified water |
| CN106761585A (en) * | 2017-02-25 | 2017-05-31 | 太原理工大学 | A kind of Abandoned golfs coal bed gas limit pumping method |
| CN113446050A (en) * | 2021-06-23 | 2021-09-28 | 煤炭科学技术研究院有限公司 | Long-injection short-pumping layered three-dimensional displacement gas extraction method and system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234737A (en) * | 2013-06-21 | 2014-12-24 | 肖栋 | Enzymolysis-boosted coal-seam methane desorption technique and method |
| CN104314609A (en) * | 2014-09-28 | 2015-01-28 | 太原理工大学 | Alternate cooling and heating yield increasing method for gas extraction bored well |
| CN104314609B (en) * | 2014-09-28 | 2016-05-25 | 太原理工大学 | A kind of method for increasing that colds and heat succeed each other for drilling well for gas drainage |
| CN104696005A (en) * | 2015-02-03 | 2015-06-10 | 太原理工大学 | Method for synchronously extracting residual coalbed methane and sealing and preserving carbon dioxide in old mined-out area of coal mine |
| CN105986835A (en) * | 2015-02-17 | 2016-10-05 | 王跃平 | Method for extracting gas in coal seam |
| CN105138029A (en) * | 2015-08-03 | 2015-12-09 | 陈信平 | Program and method for controlling pressure of nitrogen injection production increase coal bed gas |
| CN105138029B (en) * | 2015-08-03 | 2016-06-29 | 陈信平 | The compress control method of note nitrogen volume increase coal bed gas |
| CN104989339A (en) * | 2015-08-04 | 2015-10-21 | 太原理工大学 | Old goaf coalbed methane extracting and mining system and method |
| CN104989339B (en) * | 2015-08-04 | 2017-11-28 | 太原理工大学 | A kind of system and method for old dead zone extraction coal bed gas |
| CN106121604A (en) * | 2016-06-27 | 2016-11-16 | 中国矿业大学 | One utilizes CO2coal-bed gas and the method for residual gas is driven away with modified water |
| CN106121604B (en) * | 2016-06-27 | 2018-08-17 | 中国矿业大学 | It is a kind of to utilize CO2Drive away the method for coal-bed gas and residual gas with modified water |
| CN106761585A (en) * | 2017-02-25 | 2017-05-31 | 太原理工大学 | A kind of Abandoned golfs coal bed gas limit pumping method |
| CN113446050A (en) * | 2021-06-23 | 2021-09-28 | 煤炭科学技术研究院有限公司 | Long-injection short-pumping layered three-dimensional displacement gas extraction method and system |
| CN113446050B (en) * | 2021-06-23 | 2023-09-26 | 煤炭科学技术研究院有限公司 | Long-injection short-extraction layered three-dimensional displacement gas extraction method and system |
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Application publication date: 20120718 |