CN103883348B - The welding method of a kind of minery gas pumping well ground pipeline - Google Patents

The welding method of a kind of minery gas pumping well ground pipeline Download PDF

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Publication number
CN103883348B
CN103883348B CN201410133228.8A CN201410133228A CN103883348B CN 103883348 B CN103883348 B CN 103883348B CN 201410133228 A CN201410133228 A CN 201410133228A CN 103883348 B CN103883348 B CN 103883348B
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China
Prior art keywords
wireway
well casing
water
well
isolation strip
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CN103883348A (en
Inventor
叶礼明
陈家祥
李泉
吴建国
束学照
宋毅鑫
宫仕昌
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Exploration and exploration of the Polytron Technologies Inc
Huaibei Mining Group Co Ltd
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HUAIBEI MINING (GROUP) EXPLORATION ENGINEERING Co Ltd
Huaibei Mining Group Co Ltd
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Abstract

The invention discloses the welding method of a kind of minery gas pumping well ground pipeline, concrete steps are: A. installs sealing isolation strip at the inserting end of wireway (6); B. inserted by the inserting end of wireway (6) and adopt in well casing (1), make sealing isolation strip and adopt well casing to fit tightly, wireway (6) is derived ground level and is no less than 5m; C. inwardly inject mud or water from the port adopting well casing (1), the mud above guarantee sealing isolation strip or the depth of water are no less than 2m, form liquid barrier layers (4); D. flange (5) welding is carried out to the port adopting well casing (1); E. the mud above welding process termination water segregation band or the depth of water is kept to be no less than 2m; F., after flange welding completes, wireway (6) is taken out from adopting in well casing (1).The safety of well head pipeline welding in ground the present invention can ensure to there is methane gas in minery well, uses when being suitable for the maintenance of minery well head pipeline or transformation.

Description

The welding method of a kind of minery gas pumping well ground pipeline
Technical field
The present invention relates to the welding method of a kind of minery gas pumping well ground pipeline, belong to gas pumping technical field.
Background technology
In some mining areas, coal seam has coal and gas prominent and threatens, and mines after needing mash gas extraction extinction again.The coal seam in China's major part mining area has soft, that gas permeability is low, gas bearing capacity is large, pressure is high feature, and gas pumping difficulty is large, has had a strong impact on mine safety production.Ground minery well utilizes underlying seam coal-face to adopt the opportune time causing superjacent release, the waste storing gas of extraction underlying seam work plane and the parsing gas of superjacent release effectively administer coal mine gas disaster, allow coal bed gas benefit the important method of the people simultaneously.But because work plane adopts the impact causing surface settlement, ground is adopted in well extraction management process, need to carry out transformation operation to minery well or pipeline, as the weld job of producing well and pipe network.Because minery well constantly overflows gas, gas is met naked light, high temperature, electrostatic etc. and burning even blast (well head outlet gas density 20%-80% is easily occurred, the region of explosion ratio limit 5%-16% can be there is in diffusion process), cause ground well head well casing to weld.Because prior art does not still complete safely the method for above-mentioned weld job at present, cause sometimes this minery well to be blocked and scrap, again excavate minery well from other place and carry out gas pumping, thus improve the cost of production in colliery, reduce production efficiency, affect the production safety of mine simultaneously.
Summary of the invention
The object of this invention is to provide the welding method of a kind of minery gas pumping well ground pipeline, the method is easy to use, the safety of welding during the pipeline maintenance and renovation of ground when can ensure to there is methane gas in minery well.
To achieve these goals, the welding method of this minery gas pumping well ground pipeline, concrete steps are:
A. at the inserting end of wireway, sealing isolation strip is installed; Described sealing isolation strip is made up of expanded rubber (2) and cotton yarn (3), and expanded rubber (2) iron wire is banded on wireway (6), and cotton yarn (3) is entangled on the wireway (6) of expanded rubber (2) top;
B. being inserted by the inserting end of wireway adopts in well casing, makes sealing isolation strip and adopt well casing to fit tightly, and wireway is derived ground level and is no less than 5m;
C. inwardly inject mud or water from the port adopting well casing, the mud above guarantee sealing isolation strip or the depth of water are no less than 2m, form liquid barrier layers;
D. flange welding is carried out to the port adopting well casing;
If E. in welding process, when adopting mud in well casing or fall under water, then continue to inject mud or water to adopting in well casing, the mud above guarantee sealing isolation strip or the depth of water are no less than 2m;
F., after flange welding completes, wireway is taken out from adopting in well casing.
Preferably, the width of expanded rubber is 200-500mm.
Preferably, wireway stretches into adopts 4-5m in well casing, the distance 1-1.5m of the mouth of pipe of the inserting end of the lower end distance wireway of sealing isolation strip
Further, the ground external part of described wireway is welded with hanger.
Compared with prior art, the present invention is by inserting wireway adopting in well casing, and by sealing isolation strip and the liquid barrier layers injecting mud or water formation, when the port adopting well casing carries out flange welding, the gas adopted in well is drawn towards ground 5m eminence by wireway, ensure that the port of adopting well casing is without gas, and then ensure that the safety of welding.Meanwhile, constantly injecting mud or water also can reduce the temperature of adopting well casing tube wall effectively to adopting in well casing, avoiding occurring because welding causes well casing tube wall temperature to raise may making adopting the situation that gas in well casing blasts.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, adopt well casing, 2, sealing isolation strip, 3, cotton yarn, 4, liquid barrier layers, 5, flange, 6, wireway.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, concrete steps of the present invention are:
A. at the inserting end of wireway 6, sealing isolation strip is installed;
B. the inserting end of wireway 6 is inserted and adopt in well casing 1, make sealing isolation strip and adopt well casing 1 to fit tightly; Wireway 6 is derived ground level and is no less than 5m, to make the concentration of gas when being diffused into ground derived from the air guide mouth of pipe lower than the concentration that can burn or explode;
C. inwardly inject mud or water from the port adopting well casing 1, the mud above guarantee sealing isolation strip or the depth of water are no less than 2m, form liquid barrier layers 4;
D. carry out flange 5 to the port adopting well casing 1 to weld;
If E. in welding process, when adopting mud in well casing 1 or fall under water, then continue to inject mud or water to adopting in well casing 1, the mud above guarantee sealing isolation strip or the depth of water are no less than 2m; Strengthen gas monitor in the well casing port surrounding of welding simultaneously, guarantee the safety of welding personnel further;
F., after flange 5 has welded, wireway 6 is taken out from adopting in well casing 1.Weld adopting well casing and can being connected with other flanged (FLGD) pipeline of flange.
Described sealing isolation strip can be made up of the belt be arranged on wireway 6 and the cotton yarn be entangled in above belt or the rope made of hemp, also can be made up of expanded rubber 2 and cotton yarn 3.Because construction plant does not generally have tap water, need manual water lift or mud, expanded rubber water-swellable, cotton yarn shutoff expanded rubber and adopt the better of gap between well casing, the sealing isolation strip be made up of expanded rubber 2 and cotton yarn 3 better can ensure that the water on isolation strip is lower and leak.Therefore, sealing isolation strip of the present invention is preferably made up of expanded rubber 2 and cotton yarn 3, and expanded rubber 2 iron wire is banded on wireway 6, and cotton yarn 3 is entangled on the wireway 6 above expanded rubber 2.
The large then good leak-proof effect of width of obvious expanded rubber 2, considers the saving of convenience and the material tied up, the preferred 200-500mm of the width of expanded rubber 2 in the present invention.
The lower end of sealing isolation strip is larger apart from the distance of the inserting end mouth of pipe of wireway 6, from wireway disengaging (cause can not isolated water or need to reinstall sealing isolation strip) when the pressure of sealing isolation strip water above it more can be prevented larger or when pulling out wireway.But the lower end of sealing isolation strip is large apart from the distance of the inserting end mouth of pipe of wireway 6, then wireway 6 stretches into the length of adopting in well casing 1 must need to strengthen; It is large that wireway 6 stretches into the length of adopting in well casing 1, from the carrying of adopting taking-up and wireway well casing after the inconvenient wireway of meeting uses.Because the depth of water above sealing isolation strip is no less than the requirement that 2m can meet leakproof, according to test, preferred water wireway 6 of the present invention stretches into adopts 4-5m in well casing 1, the distance 1-1.5m of the mouth of pipe of the inserting end of the lower end distance wireway 6 of sealing isolation strip.
Insert for convenience of wireway 6 and adopt in well casing 1 and take out from adopting well casing 1, the ground external part of described wireway 6 is welded with hanger.
The present invention is not only applicable to the mine of vertically exploitation, is applicable to the mine of laterally exploitation yet; When the mine of laterally exploitation uses of the present invention, the sealing plate of a band water injection pipe only need be housed in the port of adopting well casing 1, like this by water injection pipe to adopt in well casing 1 inject mud or water time, due to the sealing function of sealing plate, mud or water cannot flow out to adopting well casing 1, thus stable liquid barrier layers can be formed, guarantee the safety of welding.

Claims (4)

1. a welding method for minery gas pumping well ground pipeline, it is characterized in that, concrete steps are:
A. at the inserting end of wireway (6), sealing isolation strip is installed; Described sealing isolation strip is made up of expanded rubber (2) and cotton yarn (3), and expanded rubber (2) iron wire is banded on wireway (6), and cotton yarn (3) is entangled on the wireway (6) of expanded rubber (2) top;
B. inserted by the inserting end of wireway (6) and adopt in well casing (1), make sealing isolation strip and adopt well casing (1) to fit tightly, wireway (6) is derived ground level and is no less than 5m;
C. inwardly inject mud or water from the port adopting well casing (1), the mud above guarantee sealing isolation strip or the depth of water are no less than 2m, form liquid barrier layers (4);
D. flange (5) welding is carried out to the port adopting well casing (1);
If E. in welding process, when adopting mud in well casing (1) or fall under water, then continue to inject mud or water to adopting in well casing (1), the mud above guarantee sealing isolation strip or the depth of water are no less than 2m;
F., after flange (5) has welded, wireway (6) is taken out from adopting in well casing (1).
2. the welding method of a kind of minery gas pumping well ground according to claim 1 pipeline, it is characterized in that, the width of described expanded rubber (2) is 200-500mm.
3. the welding method of a kind of minery gas pumping well ground according to claim 1 and 2 pipeline, it is characterized in that, wireway (6) stretches into adopts well casing (1) interior 4-5m, the distance 1-1.5m of the mouth of pipe of the inserting end of lower end distance wireway (6) of sealing isolation strip.
4. the welding method of a kind of minery gas pumping well ground according to claim 1 and 2 pipeline, is characterized in that, the ground external part of described wireway (6) is welded with hanger.
CN201410133228.8A 2014-04-02 2014-04-02 The welding method of a kind of minery gas pumping well ground pipeline Active CN103883348B (en)

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Publication number Priority date Publication date Assignee Title
CN106761584A (en) * 2017-02-25 2017-05-31 太原理工大学 Abandoned mine goaf coal bed gas ground discharge and mining method under a kind of aqueous conditions
CN114263449B (en) * 2021-12-14 2022-09-16 中国矿业大学 High-efficient gas drainage device based on hydraulic fracturing

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN201896631U (en) * 2010-12-06 2011-07-13 淮南矿业(集团)有限责任公司 Orifice safety device for gas extraction well
CN202900119U (en) * 2012-06-30 2013-04-24 安徽理工大学 Ground extraction gas drilled well casing dredging device
CN103255768A (en) * 2013-05-15 2013-08-21 河北建设勘察研究院有限公司 Grouting construction method of engineering well after bottom wall in pipe is sealed

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JPS62288292A (en) * 1986-06-09 1987-12-15 株式会社竹中工務店 Method for confirming water escape preventing effect of deepboring hole by chemical solution of isocyanate compound

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Publication number Priority date Publication date Assignee Title
CN201896631U (en) * 2010-12-06 2011-07-13 淮南矿业(集团)有限责任公司 Orifice safety device for gas extraction well
CN202900119U (en) * 2012-06-30 2013-04-24 安徽理工大学 Ground extraction gas drilled well casing dredging device
CN103255768A (en) * 2013-05-15 2013-08-21 河北建设勘察研究院有限公司 Grouting construction method of engineering well after bottom wall in pipe is sealed

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地面垂直采空区抽采钻井井口连接装置故障处理及改进;沈忠武;《中国煤层气》;20120430;第9卷(第2期);第22-24页 *

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Address after: 235000 No. 18, Wu Tong Road, Longhu Industrial Park, Huaibei, Anhui

Co-patentee after: Huaibei Mine Industry (Group) LLC

Patentee after: Exploration and exploration of the Polytron Technologies Inc

Address before: 235000 No. 18, Wu Tong Road, Longhu Industrial Park, Huaibei, Anhui

Co-patentee before: Huaibei Mine Industry (Group) LLC

Patentee before: Huaibei mining (Group) Exploration Engineering Co., Ltd.

CP01 Change in the name or title of a patent holder