CN105201548A - Horizontal well pressure relief extraction method - Google Patents

Horizontal well pressure relief extraction method Download PDF

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Publication number
CN105201548A
CN105201548A CN201510651672.3A CN201510651672A CN105201548A CN 105201548 A CN105201548 A CN 105201548A CN 201510651672 A CN201510651672 A CN 201510651672A CN 105201548 A CN105201548 A CN 105201548A
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CN
China
Prior art keywords
coal
extraction
horizontal well
gas
well
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510651672.3A
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Chinese (zh)
Inventor
李海贵
刘毅
柯昌友
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANXI JINCHENG ANTHRACITE MINING GROUP TECHNOLOGY RESEARCH INSTITUTE Co Ltd
Original Assignee
SHANXI JINCHENG ANTHRACITE MINING GROUP TECHNOLOGY RESEARCH INSTITUTE Co Ltd
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Filing date
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Application filed by SHANXI JINCHENG ANTHRACITE MINING GROUP TECHNOLOGY RESEARCH INSTITUTE Co Ltd filed Critical SHANXI JINCHENG ANTHRACITE MINING GROUP TECHNOLOGY RESEARCH INSTITUTE Co Ltd
Priority to CN201510651672.3A priority Critical patent/CN105201548A/en
Publication of CN105201548A publication Critical patent/CN105201548A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

The invention relates to a novel extraction method of pre-extracting lower group coal gas through a ground well, in particular to a horizontal well pressure relief extraction method and solves the technical problem that current lower group coal gas is difficult to extract. The horizontal well pressure relief extraction method is used for extracting the gas of lower group coal; the method comprises the following steps: 1, constructing a horizontal well in a coal bed of the lower group coal by penetrating through a coal pillar of upper group coal before the upper group coal is exploited; 2, after the working face of the upper group coal is back-exploited, utilizing a ground gas extraction system for extracting gas of the coal bed of the lower group coal located within the pressure relief range through the horizontal well. According to the method, the coal seam group exploration mine pressure displaying principle, the ground well gas extraction drilling technology, the coal bed gas extraction principle and technical principles such as system construction are combined, the method has the advantages that the extraction effect is improved, the advanced property is great, the difficult problems that lower group coal is low in air permeability, difficult to extract and insufficient in extraction time are solved, and the method is ranked at the internationally leading level.

Description

Horizontal well release pumping method
Technical field
The present invention relates to a kind of utilize the pre-extraction of surface well under organize the novel extraction way of coal gas, be specially a kind of horizontal well release pumping method.
Background technology
Jin Mei group adopts surface well extraction technology to adopt 3# coal-bed gas to main in the block of Jincheng, and achieve good extracting result, ground gas extraction technology is in domestically leading level.For realizing the rational mixed mining of mine, the pre-extraction of lower group coal must be realized in advance.
From preliminary grasp Qinshui coalfield organize coal (based on 9# coal, 15# coal) gas pumping basic data viewed from, for upper group of coal (3# coal seam), lower group of coal gas bearing capacity is higher, gas pressure is larger, threaten more serious to the gas of mine, but the taking out property of lower group coal and extraction difficulty are larger, and the time of extraction is more limited.
For solving the problems of the technologies described above, the new extraction way of necessary research carries out advanced pre-extraction, for the gas control of lower group of coal creates conditions to lower group of coal.
Summary of the invention
The present invention solves the lower gas organizing coal to be at present difficult to the technical problem of extraction, provides a kind of horizontal well release pumping method.
The present invention adopts following technology case to realize: a kind of horizontal well release pumping method, and the gas for lower group of coal carries out extraction; Comprise the steps: that (1) is passed before upper group of coal mining to organize coal coal column and to construct in lower group of coal coal seam water horizontal well; (2) when after upper group of coal working face extraction, ground gas extraction system is utilized to carry out extraction by horizontal well to the lower group of coal coal-bed gas be in relief range.
Horizontal well release pumping method is organized coal (3# coal seam) and is about to the time before exploiting on utilizing, complete the layout of lower group of coal seam surface well extraction engineering, be in relief range when group coal lower after upper group of coal (3# coal seam) back production and improve gas gas permeability and desorption ability, realizing extraction in the short period of time up to standard; Group coal is passed through in the accurately location that is arranged through of lower group of coal seam surface well extraction engineering, then utilizes horizontal well technology to cover lower group coal and implements pre-extraction.Meanwhile, for adapting to the feature of lower group of coal release extraction, need to be equipped with corresponding lower negative pressure, large discharge ground extraction equipment.The described relief range time of release is in other words that those skilled in the art can determine according to back production situation and coal seam conditions.
Further, horizontal well and ground gas extraction system be laid in 3# seam mining before within 3-6 month, complete.
Further, horizontal well adopts far-end to dock U-shaped well, near-end docking horizontal pinnate well.
The layout of lower group of coal seam surface well extraction engineering is connected according to coal mine excavation opportunity, selects within 3-6 month before 3# seam mining, complete.Equipment, electric power system, the construction in place and installation will be carried out in time after surface well engineering completes.Carry out draining in time subsequently, for lower group of coal enter relief range after can extraction create conditions in time.
The space of ground drilling is furnished with two important contents.One is accurately to pass through 3# coal seam coal column.Two is will according to the rational horizontal well form of mining operation layout design of ocurrence of coal seam feature and lower group coal.Current comparative maturity be far-end dock U-shaped well, near-end docking horizontal pinnate well.
There is after lower group of coal release the feature that gas pressure reduces, gas permeability of coal seam increases, drilling gas flow increases.For this reason, the original gas pressure in coal seam was originally utilized to carry out the mode of malleation mining just no longer applicable.Meanwhile, having of distressed zone is certain ageing, steady and sure gradually along with upper group of coal goaf, and release effect can progressively reduce.For this reason, need the time making full use of distressed zone existence, just need the ground extraction equipment being equipped with lower negative pressure, large discharge, respective capabilities.
This method combines the know-whies such as coal seam group mining strata-pressure behavior, surface well gas pumping drilling technology, the construction of coal bed gas extraction principle and system, have and improve extracting result, advanced strong advantage, solve that lower group of coal low-permeable hard-pumped is adopted, a difficult problem for extraction deficiency of time, be in level leading in the world.
The present invention has following beneficial effect: arrange suitable well type by lower group of coal ground drilling in the suitable time, and utilize ground extraction equipment to realize gas pumping within a short period of time up to standard, the gas control for lower group of coal gains time and space.
Detailed description of the invention
A kind of horizontal well release pumping method, the gas for lower group of coal carries out extraction; Comprise the steps: that (1) is passed before upper group of coal mining to organize coal coal column and to construct in lower group of coal coal seam water horizontal well; (2) when after upper group of coal working face extraction, ground gas extraction system is utilized to carry out extraction by horizontal well to the lower group of coal coal-bed gas be in relief range.
Described lower group of coal is based on 9# coal, 15# coal; Day-coal is 3# coal seam.
Adapt to the feature of lower group coal release extraction, need to be equipped with corresponding lower negative pressure, large discharge ground extraction equipment.
Horizontal well and ground gas extraction system be laid in 3# seam mining before within 3-6 month, complete.
Horizontal well adopts far-end to dock U-shaped well, near-end docking horizontal pinnate well.The arrangement of this horizontal well is very applicable to upper group of coal of the present invention and lower group coal.

Claims (5)

1. a horizontal well release pumping method, the gas for lower group of coal carries out extraction; It is characterized in that, comprise the steps: that (1) is passed before upper group of coal mining and organize coal coal column and to construct in lower group of coal coal seam water horizontal well; (2) when after upper group of coal working face extraction, ground gas extraction system is utilized to carry out extraction by horizontal well to the lower group of coal coal-bed gas be in relief range.
2. horizontal well release pumping method as claimed in claim 1, it is characterized in that, described lower group of coal is based on 9# coal, 15# coal; Day-coal is 3# coal seam.
3. horizontal well release pumping method as claimed in claim 1 or 2, is characterized in that, adapts to the feature of lower group coal release extraction, needs to be equipped with corresponding lower negative pressure, large discharge ground extraction equipment.
4. horizontal well release pumping method as claimed in claim 2, is characterized in that, horizontal well and ground gas extraction system be laid in 3# seam mining before within 3-6 month, complete.
5. the horizontal well release pumping method as described in claim 2 or 4, is characterized in that, horizontal well adopts far-end to dock U-shaped well, near-end docking horizontal pinnate well.
CN201510651672.3A 2015-10-10 2015-10-10 Horizontal well pressure relief extraction method Pending CN105201548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510651672.3A CN105201548A (en) 2015-10-10 2015-10-10 Horizontal well pressure relief extraction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510651672.3A CN105201548A (en) 2015-10-10 2015-10-10 Horizontal well pressure relief extraction method

Publications (1)

Publication Number Publication Date
CN105201548A true CN105201548A (en) 2015-12-30

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CN201510651672.3A Pending CN105201548A (en) 2015-10-10 2015-10-10 Horizontal well pressure relief extraction method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110541727A (en) * 2019-09-20 2019-12-06 西安闪光能源科技有限公司 coal bed gas ground treatment method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102116140A (en) * 2011-01-25 2011-07-06 煤炭科学研究总院西安研究院 Construction method for enhancing extraction effect of ground coal bed gas
CN102828768A (en) * 2012-08-28 2012-12-19 山西潞安集团余吾煤业有限责任公司 Method and system for gas pumping of high-gas coal mines
CN103306714A (en) * 2013-06-09 2013-09-18 中国矿业大学 Gas control method for triple-purpose use of drilled holes in coal floor of close distance seam group
CN103967472A (en) * 2014-05-26 2014-08-06 中煤科工集团西安研究院有限公司 Horizontal well forced gas drainage method with coal bed gas subjected to staged fracturing
CN104131831A (en) * 2014-06-12 2014-11-05 中国矿业大学 Coal-bed gas well vertical three-dimensional united extraction method
EP2899363A1 (en) * 2012-09-21 2015-07-29 Enn Coal Gasification Mining Co. Ltd. Method for joint-mining of coalbed gas and coal

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
CN102116140A (en) * 2011-01-25 2011-07-06 煤炭科学研究总院西安研究院 Construction method for enhancing extraction effect of ground coal bed gas
CN102828768A (en) * 2012-08-28 2012-12-19 山西潞安集团余吾煤业有限责任公司 Method and system for gas pumping of high-gas coal mines
EP2899363A1 (en) * 2012-09-21 2015-07-29 Enn Coal Gasification Mining Co. Ltd. Method for joint-mining of coalbed gas and coal
CN103306714A (en) * 2013-06-09 2013-09-18 中国矿业大学 Gas control method for triple-purpose use of drilled holes in coal floor of close distance seam group
CN103967472A (en) * 2014-05-26 2014-08-06 中煤科工集团西安研究院有限公司 Horizontal well forced gas drainage method with coal bed gas subjected to staged fracturing
CN104131831A (en) * 2014-06-12 2014-11-05 中国矿业大学 Coal-bed gas well vertical three-dimensional united extraction method

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迈克尔?斯勒恩贝茨等: "水平井在地下硬煤开采中的瓦斯抽采潜力", 《中国煤层气》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110541727A (en) * 2019-09-20 2019-12-06 西安闪光能源科技有限公司 coal bed gas ground treatment method
CN110541727B (en) * 2019-09-20 2021-05-04 西安闪光能源科技有限公司 Coal bed gas ground treatment method

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Application publication date: 20151230

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