CN111022109A - Method for extracting gas in closed goaf - Google Patents
Method for extracting gas in closed goaf Download PDFInfo
- Publication number
- CN111022109A CN111022109A CN201911347177.8A CN201911347177A CN111022109A CN 111022109 A CN111022109 A CN 111022109A CN 201911347177 A CN201911347177 A CN 201911347177A CN 111022109 A CN111022109 A CN 111022109A
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- Prior art keywords
- well
- ground
- coal
- bed gas
- extraction
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 38
- 238000000605 extraction Methods 0.000 claims abstract description 28
- 238000005065 mining Methods 0.000 claims abstract description 23
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000013316 zoning Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 238000009412 basement excavation Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
A method for extracting gas in a closed goaf belongs to the technical field of ground mining of coal bed gas, and aims to provide a method for extracting gas in the closed goaf. The method comprises the following steps: and constructing a ground coalbed methane pre-pumping well above the roadway of the ground zoning area, wherein the well type of the well is a directional inclined straight well, and the target point falls on a mining stop line of a planned underground mining working surface of the coal mine. And the production casing of the coal-bed gas well is not cut after the underground excavation working face is recovered to the stoping line. And (3) hermetically connecting the extraction pipeline reserved on the mining working face with the production casing of the coal-bed gas well. The well ground extraction equipment is changed into a vacuum pump for negative pressure extraction of gas in the goaf. The invention makes full use of the original gathering and transportation pipeline on the ground and has good social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of ground mining of coal bed gas, and particularly relates to a method for extracting gas in a closed goaf.
Background
The main component of coal mine gas is methane, and pre-extraction, mining extraction and mining extraction before mining are realized along with the growing development of the coal bed gas cause in China. The three modes realize extraction and utilization of coal bed gas in different stages of mine gas. However, disturbance of an overlying rock layer is caused when a goaf is formed, the ground coalbed methane production well is damaged by strong formation pressure, the ground coalbed methane well can only realize pre-extraction and mining extraction before mining, and after the goaf is formed underground, if gas in the goaf is required to be treated, secondary well digging is usually carried out, so that great waste of the ground pre-extraction well is caused.
Disclosure of Invention
The invention aims to provide a method for extracting gas in a closed goaf, which utilizes the connection of a coal bed gas pre-extraction well and an extraction pipeline embedded in the underground closed goaf to realize the extraction and utilization of the gas in the closed goaf.
The invention adopts the following technical scheme:
a method for extracting gas in a closed goaf comprises the following steps:
firstly, constructing a ground coal bed gas pre-pumping well above a roadway of a ground zoning area, wherein the coal bed gas pre-pumping well is a directional inclined straight well, a target point falls on a mining stop line of a planned underground mining working surface of a coal mine, and a production casing of the coal bed gas pre-pumping well is not cut off after the underground mining working surface is mined to the mining stop line;
secondly, connecting an extraction pipeline reserved on the coal face with a production casing of the coal bed gas pre-extraction well in a sealing manner;
and thirdly, changing the ground extraction equipment of the coal bed gas pre-pumping well into a vacuum pump for extracting gas in the goaf under negative pressure.
The invention has the following beneficial effects:
according to the invention, through the selection of the type of the coal bed gas well body structure and the selection of the ground coal bed gas well mouth position, the change rule of the coal bed overlying strata on the time space after the coal bed is stoped is combined, and good connection is realized. The method can realize the conversion of the extraction gas from the coal bed gas pre-extraction well to the goaf well, the inclined straight well is arranged from the ground well mouth to the underground target point selection, the damage of the deformation of the overburden stratum to the well body structure of the coal bed gas well after the underground stope working face forms the goaf is well avoided, the method is particularly suitable for the good connection of the upper extraction and the lower extraction of the coal mine on the time space, and the utilization efficiency of the ground coal bed gas well is improved.
1. The invention saves the capital investment of the mining empty well
2. The invention reduces the extraction period of the underground gas.
3. The invention makes full use of the original gathering and transportation pipeline on the ground and has good social and economic benefits.
Drawings
FIG. 1 is a schematic plan view of a goaf gas extracted and sealed above a well;
FIG. 2 is a schematic diagram of a gas section of a closed goaf extracted above a well;
wherein: 1-central main lane; 2-central secondary lane; 3-disc area front lane; 4-disc zone auxiliary lane; 5-a goaf; 6-coal bed; 7-stopping production line; 8-extraction pipeline.
Detailed Description
The invention is further explained with reference to the accompanying drawings.
As shown in the figure, the method for extracting the gas in the closed goaf comprises the following steps:
firstly, constructing a ground coal bed gas pre-pumping well above a roadway of a ground zoning area, wherein the coal bed gas pre-pumping well is a directional inclined straight well, a target point falls on a mining stop line of a planned underground mining working surface of a coal mine, and a production casing of the coal bed gas pre-pumping well is not cut off after the underground mining working surface is mined to the mining stop line;
secondly, connecting an extraction pipeline reserved on the coal face with a production casing of the coal bed gas pre-extraction well in a sealing manner;
and thirdly, changing the ground extraction equipment of the coal bed gas pre-pumping well into a vacuum pump for extracting gas in the goaf under negative pressure.
Wherein, the diameter of a well opening hole of the coal bed gas pre-pumping well is 444.5mm, and the diameter of the pipe sleeve is as follows: 377.7 mm; the diameter of the two-open hole is 311.15mm, the diameter of the casing is 244.5mm, the diameter of the three-open hole is 215.9mm, and the diameter of the casing is 139.7 mm.
Claims (1)
1. A method for extracting gas in a closed goaf is characterized by comprising the following steps: the method comprises the following steps:
firstly, constructing a ground coal bed gas pre-pumping well above a roadway of a ground zoning area, wherein the coal bed gas pre-pumping well is a directional inclined straight well, a target point falls on a mining stop line of a planned underground mining working surface of a coal mine, and a production casing of the coal bed gas pre-pumping well is not cut off after the underground mining working surface is mined to the mining stop line;
secondly, connecting an extraction pipeline reserved on the coal face with a production casing of the coal bed gas pre-extraction well in a sealing manner;
and thirdly, changing the ground extraction equipment of the coal bed gas pre-pumping well into a vacuum pump for extracting gas in the goaf under negative pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911347177.8A CN111022109B (en) | 2019-12-24 | 2019-12-24 | Method for extracting gas in closed goaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911347177.8A CN111022109B (en) | 2019-12-24 | 2019-12-24 | Method for extracting gas in closed goaf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111022109A true CN111022109A (en) | 2020-04-17 |
| CN111022109B CN111022109B (en) | 2021-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911347177.8A Active CN111022109B (en) | 2019-12-24 | 2019-12-24 | Method for extracting gas in closed goaf |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111022109B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647975A (en) * | 2020-12-22 | 2021-04-13 | 华能煤炭技术研究有限公司 | Closed extraction method and system for goaf on roof-cutting roadway-retaining working face |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
| CN104405283A (en) * | 2014-10-22 | 2015-03-11 | 山西蓝焰煤层气集团有限责任公司 | Technique for extracting gas from L-shaped ground drilling well in mining area |
| CN105134286A (en) * | 2015-10-13 | 2015-12-09 | 山西晋煤集团技术研究院有限责任公司 | Method for extracting gas of gob of L-shaped well |
| CN207194872U (en) * | 2017-07-31 | 2018-04-06 | 山西晋城无烟煤矿业集团有限责任公司 | One kind adopts well construction using high-pressure fluid dredging L-type coal bed gas |
| CN107916953A (en) * | 2017-11-24 | 2018-04-17 | 陕西省煤层气开发利用有限公司 | Gas drainage system, pumping method and construction technology based on roof horizontal drilling |
-
2019
- 2019-12-24 CN CN201911347177.8A patent/CN111022109B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
| CN104405283A (en) * | 2014-10-22 | 2015-03-11 | 山西蓝焰煤层气集团有限责任公司 | Technique for extracting gas from L-shaped ground drilling well in mining area |
| CN105134286A (en) * | 2015-10-13 | 2015-12-09 | 山西晋煤集团技术研究院有限责任公司 | Method for extracting gas of gob of L-shaped well |
| CN207194872U (en) * | 2017-07-31 | 2018-04-06 | 山西晋城无烟煤矿业集团有限责任公司 | One kind adopts well construction using high-pressure fluid dredging L-type coal bed gas |
| CN107916953A (en) * | 2017-11-24 | 2018-04-17 | 陕西省煤层气开发利用有限公司 | Gas drainage system, pumping method and construction technology based on roof horizontal drilling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647975A (en) * | 2020-12-22 | 2021-04-13 | 华能煤炭技术研究有限公司 | Closed extraction method and system for goaf on roof-cutting roadway-retaining working face |
| CN112647975B (en) * | 2020-12-22 | 2023-12-29 | 华能煤炭技术研究有限公司 | Closed extraction method and system for goaf of roof-cutting entry retaining working face |
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| Publication number | Publication date |
|---|---|
| CN111022109B (en) | 2021-06-01 |
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