CN107152261A - Coal bed gas extraction system and method for construction - Google Patents

Coal bed gas extraction system and method for construction Download PDF

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Publication number
CN107152261A
CN107152261A CN201710326109.8A CN201710326109A CN107152261A CN 107152261 A CN107152261 A CN 107152261A CN 201710326109 A CN201710326109 A CN 201710326109A CN 107152261 A CN107152261 A CN 107152261A
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CN
China
Prior art keywords
mining
bed gas
coal bed
pipeline
connection
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
CN201710326109.8A
Other languages
Chinese (zh)
Inventor
杨俊哲
向军文
安世岗
贺安民
李明建
张永福
陈殿赋
申伟芳
罗伙根
谷亮鸽
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.)
SHENHUA GEOLOGICAL EXPLORATION CO Ltd
China Shenhua Energy Co Ltd
Shenhua Shendong Coal Group Co Ltd
Original Assignee
SHENHUA GEOLOGICAL EXPLORATION CO Ltd
China Shenhua Energy Co Ltd
Shenhua Shendong Coal Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SHENHUA GEOLOGICAL EXPLORATION CO Ltd, China Shenhua Energy Co Ltd, Shenhua Shendong Coal Group Co Ltd filed Critical SHENHUA GEOLOGICAL EXPLORATION CO Ltd
Priority to CN201710326109.8A priority Critical patent/CN107152261A/en
Publication of CN107152261A publication Critical patent/CN107152261A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well

Abstract

The invention discloses a kind of coal bed gas extraction system and method for construction.Chamber is expanded in the connection that coal bed gas extraction system includes being used for gathering coal bed gas from coal seam, and the connection is expanded chamber and is arranged in the coal seam;Mining pipeline, bearing of trend laying of the mining pipeline along tunnel, the mining pipeline is negative-pressure pipeline, and the mining pipeline includes the output end for being used to export coal bed gas, and the output end is extended on ground;Suction wells, the end of the suction wells is expanded chamber with the connection and is connected, and the head end of the suction wells is connected with the mining pipeline.Present invention also offers a kind of method of construction of coal bed gas extraction system to build coal bed gas extraction system.Coal bed gas extraction system and method for construction that the present invention is provided, reduce energy consumption, reduce the extraction cost of coal bed gas, reduce surface construction expense, reduce the operating cost of drilling well.

Description

Coal bed gas extraction system and method for construction
Technical field
The present invention relates to Coal-seam Gas Recovery Technologies field, more particularly to a kind of coal bed gas extraction system and method for construction.
Background technology
Coal bed gas is commonly called as gas, is unconventional natural gas, and coal seam is both the production source rock of coal bed gas, is coal bed gas again Reservoir, generally requires special extraction technology and goes out as the energy to use using coal bed gas extraction.
In the prior art, mineral diagram is typically taken out using straight well extraction, the U-shaped connected well of cluster well extraction and ground The technology such as adopt to be exploited, the production technique of above-mentioned mineral diagram has the following disadvantages:First, process of the coal bed gas in exploitation In coal bed gas is extracted, it is necessary to be separately provided aspirator on ground, improve the suction cost of coal bed gas, add energy Consumption;Second, the pipe network system and auxiliary facility of laying transport coal bed gas are needed on ground, surface construction expense is added;3rd, Drilling well is the passage of coal bed gas extraction, needs to carry out periodic maintenance to drilling well during extraction, adds the running cost of drilling well With.
Therefore, it is necessary to solve above-mentioned technical problem.
The content of the invention
The present invention provides a kind of coal bed gas extraction system and method for construction, to solve problems of the prior art, drop Low energy consumption, reduces the extraction cost of coal bed gas, reduces surface construction expense, reduces the operating cost of drilling well.
The invention provides a kind of coal bed gas extraction system, including:Chamber is expanded in connection for gathering coal bed gas from coal seam, The connection is expanded chamber and is arranged in the coal seam;Mining pipeline, bearing of trend laying of the mining pipeline along tunnel, the row Pipeline is adopted for negative-pressure pipeline, the mining pipeline includes the output end for being used to export coal bed gas, the output end extends to ground On;Suction wells, the end of the suction wells is expanded chamber with the connection and is connected, the head end of the suction wells and the mining pipeline It is connected.
Alternatively, the level height of the head end of the suction wells is less than or equal to the level height of the end of the suction wells Degree.
Alternatively, negative suction system, the mining pipeline and the negative suction system phase are provided with the tunnel Connection, the negative suction system is close to the output end.
Alternatively, the head end of the suction wells is connected with the side wall of the mining pipeline.
Alternatively, the mining pipeline is fixed on the wall in the tunnel.
Alternatively, the drainage from coal seam system also includes mining straight well, and the head end of the mining straight well is opened up on the ground, The end of the mining straight well is expanded chamber with the connection and is connected, and the head end of the mining straight well is located at the end of the mining straight well The surface at end.
Alternatively, the drainage from coal seam system also includes surface water horizontal well, and the surface water horizontal well includes horizontal segment and perpendicular Straight inclination section, the end of the horizontal segment is expanded chamber with the connection and is connected, the head end of the horizontal segment and the vertical deflecting The end of section is connected, and the head end of the vertical inclination section is opened up on the ground, and the vertical inclination section is parallel to the mining Straight well.
Alternatively, the end of the suction wells and the end of the horizontal segment are located in same level.
Alternatively, screen casing is provided with the suction wells, the end of the screen casing is expanded chamber with the connection and is connected, described The head end of screen casing is connected with the mining pipeline.
Based on same inventive concept, present invention also offers a kind of method of construction of coal bed gas extraction system, including it is following Step:S1. planned according to development, determine that the position of chamber is expanded in connection in the coal seam for store coal bed gas, and be drilled with out Chamber is expanded in the connection;S2. mining pipeline, bearing of trend laying of the mining pipeline along tunnel are laid, the mining pipeline is Negative-pressure pipeline, the mining pipeline includes the output end for being used to collect coal bed gas, and the output end is extended on ground;S3. bore If suction wells, the end of the suction wells is expanded chamber with the connection and be connected, the head end of the suction wells and the mining pipe Road is connected.
Coal bed gas extraction system and method for construction that the present invention is provided, the coal bed gas extraction system that the present invention is provided, directly , can be effective by coal bed gas by setting the suction channel with subnormal ambient inside tunnel by the subnormal ambient in tunnel Ground is pumped in mining pipeline from horizontal segment and suction wells, significantly reduces energy consumption, and in the inside in tunnel that coal bed gas is defeated Deliver at coal bed gas collection, compared to prior art, solve the installation extraction equipment and mining water needed for waterflooding behavior technology Process problem, without setting up ground transport pipe network, reduces the production cost needed for surface construction and management, saves well repairing cost With.
Brief description of the drawings
Preferred embodiment in the present invention will be described in detail by accompanying drawing below, it will help understand the purpose of the present invention and excellent Point, wherein:
The structural representation for the coal bed gas extraction system that Fig. 1 provides for the present invention.
The flow chart of the method for construction for the coal bed gas extraction system that Fig. 2 provides for the preferred embodiment of the present invention.
Embodiment
Mention in this manual or up, down, left, right, before and after, front, the back side, top, the bottom that may mention etc. Orientation term is defined relative to the construction shown in each accompanying drawing, and head end, end are determined relative to engineering construction Justice, it is relative general that word " interior " and " outer ", which refer respectively to towards or away from the direction of particular elements geometric center them, Read, it is therefore possible to can correspondingly be changed according to its residing diverse location, different use states.So, should not yet These or other orientation term are construed to restricted term.
The structural representation for the coal bed gas extraction system that Fig. 1 provides for the present invention.As shown in figure 1, the invention provides one Coal bed gas extraction system is planted, including chamber 1, mining pipeline 3 and suction wells 4 are expanded in connection.
Fig. 1 is refer to, the connection is expanded chamber 1 and is arranged in the coal seam, and connection is expanded chamber 1 and connected in the end of suction wells 4, For collecting coal dust and connection from coal seam.Alternatively, tunnel 2 is the colliery main entry dug.The mining pipeline 3 is along institute The bearing of trend laying in tunnel 2 is stated, wherein mining pipeline 3 can be original ventilation shaft in tunnel 2, reduce and lay again Production cost needed for pipeline.Due to being typically provided with negative pressure air exhauster in tunnel 2, negative pressure air exhauster can produce subnormal ambient, Make to form negative pressure in mining pipeline 3 of the connection in tunnel 2, used as negative-pressure pipeline.The mining pipeline 3 is included for defeated The output end of coal output layer gas, coal bed gas expands chamber 1 from connection and suction wells 4 are transported and are output to output end, is connected in output end There is coal bed gas collection device, for collecting coal bed gas, the output end is extended on ground.As an alternatively embodiment, Mining pipeline 3 can be extended on ground from the porch in tunnel 2, and is attached on the ground with coal bed gas collection device. The end of the suction wells 4 is expanded chamber 1 with the connection and is connected, and the head end of the suction wells 4 is connected with the mining pipeline 3 Logical, suction wells 4 are similarly disposed in coal seam, and the coal bed gas in coal seam can be directly entered connection and expand in chamber 1 and suction wells 4 and quilt It is pumped in mining pipeline 3, the coal bed gas that connection is expanded inside chamber 11 and suction wells 4 expands the He of chamber 1 under differential pressure action along connection Suction wells 4 enter the inside of mining pipeline 3, and are output in output end, convenient and swift.
The coal bed gas extraction system that the present invention is provided, directly by the subnormal ambient in tunnel 2, by tunnel 2 Portion sets the mining pipeline 3 with subnormal ambient, coal bed gas effectively can be expanded into the row of being pumped in chamber 1 and suction wells 4 from connection Adopt in pipeline 3, significantly reduce energy consumption, and be delivered to coal bed gas at coal bed gas collection in the inside in tunnel 2, compared to existing There is technology, the problem of waterflooding behavior technology needs to install extraction equipment and handle mining water is solved, without setting up ground transport Pipe network, reduces the production cost needed for surface construction and management, saves workover cost.
Alternatively, the level height of the head end of the suction wells 4 is less than or equal to the level of the end of the suction wells 4 Highly, coal bed gas can quickly flow to the inside of mining pipeline 3 under discrepancy in elevation effect, can further increase the speed of suction Degree.
Alternatively, negative suction system, the mining pipeline 3 and the negative suction system are provided with the tunnel 2 It is connected, the negative suction system is close to the output end.Negative suction system can form negative pressure ring in mining pipeline 3 Border, be conducive to coal bed gas under differential pressure quick collecting in the inside of mining pipeline 3;Position where negative suction system is negative pressure At maximum position, output end is set close to the negative suction system, can further increase output end output coal bed gas Speed.
Further, the head end of the suction wells 4 is connected with the side wall of the mining pipeline 3, and the head end of suction wells 4 can It is convenient and swift to be directly installed on the upper of mining pipeline 3.The diameter of mining pipeline 3 can also be set to be more than the head end of suction wells 4 Diameter, the side wall of mining pipeline 3 is directly connected to the head end of the suction wells 4, and opens up at abutting intercommunicating pore.Take out The quantity for inhaling well 4 can be multiple, and the head end of multiple suction wells 4 is connected on the side wall of the mining pipeline 3, to increase The mining efficiency of mining pipeline 3.
It is preferred that the mining pipeline 3 can be fixed on the wall in the tunnel 2, the quilt of mining pipeline 3 is effectively prevented Construction equipment scratch or crowded wound inside tunnel 2, it is ensured that the stability of the structure of mining pipeline 3.
Further, the drainage from coal seam system also includes mining straight well 5, and the head end of the mining straight well 5 is opened in ground On face, the end of the mining straight well 5 is expanded chamber 1 with the connection and is connected, and the head end of the mining straight well 5 is located at the mining The surface of the end of straight well 5.The mining straight well 5 is used to be drilled with connection expansion chamber 1, and it is by normal in mining straight well 5 that chamber 1 is expanded in connection The expansion chamber drill bit that rule coal bed gas straight well is more than 0.5m after the completion of being drilled with diameter expands chamber 1 to connection and carries out reaming formation, mesh Be to facilitate ground horizontal well 6 to be connected with mining straight well 5, and be easy to suction wells 4 to be connected with mining straight well 5.
It is preferred that the drainage from coal seam system also includes surface water horizontal well 6, the surface water horizontal well 6 includes horizontal segment 61 With vertical inclination section 62, the end of the horizontal segment 61 is expanded chamber 1 with the connection and is connected, the head end of the horizontal segment 61 and institute The end for stating vertical inclination section 62 is connected, and the head end of the vertical inclination section 62 is opened up on the ground, and coal bed gas is from horizontal segment 61 and suction wells 4 transport and be output to output end.The vertical inclination section 62 is parallel to the mining straight well 5.In the present invention Surface water horizontal well 6 and mining straight well 5 can form U-shaped connected well, when mining pipeline 3 breaks down, can also first seal Suction wells 4 are closed, then the skill that coal bed gas is pumped out from mining straight well 5 are realized by injecting driving water on surface water horizontal well 6 Art effect.
The step of setting above-mentioned surface water horizontal well 6, mining straight well 5 and suction wells 4 can be as follows:First with rig Connection expansion chamber 1 is formed in ground construction mining straight well 5, and in the end of mining straight well 5, deviational survey is then carried out, chamber 1 is expanded to connection Positioned.Secondly, then drilling surface water horizontal well 6, implemented using Technology of Directional Drilling directional inclination to mining coal seam first The horizontal well drilling of horizontal segment 61, the drilling of horizontal segment 61 expands chamber 1 to connection.Expand the position coordinates of chamber 1 finally according to connection, in lane Well head is determined in the same level in road 2, using horizontal drilling technology and Technology of Directional Drilling horizontal drilling, suction wells 4 are got out, Suction wells 4 are communicated to connection and expand chamber 1, and tripping in screen casing installs well head and is connected completion with mining pipeline 3 in tunnel 2.Constructing again Straight well in tripping in diameter be more than 0.5m expand chamber drill bit to connection expand chamber 1 inside progress expansion chamber, so as to complete the surface water The three wells connection of horizontal well 6, mining straight well 5 and suction wells 4, realizes and utilizes the negative pressure mining coal seam of mining pipeline 3 in tunnel 2 Gas.
Alternatively, the end of the suction wells 4 and the end of the horizontal segment 61 are located at same level
On face.It can be conducive to keeping effective connection between horizontal segment 61 and suction wells 4, the coal of the side of horizontal segment 61 can be made Layer gas is effectively pumped out.
Further, screen casing is provided with the suction wells 4, the end of the screen casing is expanded chamber 1 with the connection and is connected, The head end of the screen casing is connected with the mining pipeline 3, and sieve aperture is provided with screen casing, and sieve aperture can effective filter out coal bed gas In the impurity such as sandstone, be conducive to purifying coal bed gas.
The flow chart of the method for construction for the coal bed gas extraction system that Fig. 2 provides for the preferred embodiment of the present invention.
As depicted in figs. 1 and 2, based on same inventive concept, present invention also offers a kind of building for coal bed gas extraction system Method is made, is comprised the following steps:S1. planned according to development, determine that chamber 1 is expanded in connection in the coal seam for store coal bed gas Position, and be drilled with out it is described connection expand chamber 1;S2. mining pipeline 3, bearing of trend of the mining pipeline 3 along tunnel 2 are laid Laying, the mining pipeline 3 is negative-pressure pipeline, and the mining pipeline 3 includes the output end for being used to collect coal bed gas, the output End is extended on ground;S3. suction wells 4 are drilled with, the end of the suction wells 4 is expanded chamber 1 with the connection and is connected, it is described to take out The head end for inhaling well 4 is connected with the mining pipeline 3.
In the present embodiment, according to calculating, determine that exploitation point after the distance of development planning region, is calibrated out The position coordinates of sampling site, is then drilled with downwards to coal seam vertically according to the position coordinates according to mineral diagram pump drainage well construction In until be drilled with out connection expand chamber 1.
The method of construction for the coal bed gas extraction system that the present invention is provided, directly by the subnormal ambient in tunnel 2, by The inside of tunnel 2 sets the mining pipeline 3 with subnormal ambient, can effectively take out coal bed gas out of horizontal segment 61 and suction wells 4 It is drawn in mining pipeline 3, significantly reduces energy consumption, and be delivered to coal bed gas at coal bed gas collection in the inside in tunnel 2, phase Than in prior art, solving the problem of waterflooding behavior technology needs to install extraction equipment and handle mining water, without setting up ground Pipe network is transported in face, is reduced the production cost needed for surface construction and management, is saved workover cost.
Finally it should be noted that:The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that:It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic; And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.

Claims (10)

1. a kind of coal bed gas extraction system, it is characterised in that including:
Chamber is expanded in connection for gathering coal bed gas from coal seam, and the connection is expanded chamber and is arranged in the coal seam;
Mining pipeline, bearing of trend laying of the mining pipeline along tunnel, the mining pipeline is negative-pressure pipeline, the mining Pipeline includes the output end for being used to export coal bed gas, and the output end is extended on ground;
Suction wells, the end of the suction wells is expanded chamber with the connection and is connected, the head end of the suction wells and the mining pipe Road is connected.
2. coal bed gas extraction system according to claim 1, it is characterised in that the level height of the head end of the suction wells Less than or equal to the level height of the end of the suction wells.
3. coal bed gas extraction system according to claim 1, it is characterised in that negative-pressure ward dress is provided with the tunnel Put, the mining pipeline is connected with the negative suction system, and the negative suction system is close to the output end.
4. coal bed gas extraction system according to claim 1, it is characterised in that the head end of the suction wells and the mining The side wall of pipeline is connected.
5. coal bed gas extraction system according to claim 1, it is characterised in that the mining pipeline is fixed on the tunnel Wall on.
6. coal bed gas extraction system according to claim 1, it is characterised in that the drainage from coal seam system also includes mining Straight well, the head end of the mining straight well is opened up on the ground, and the end of the mining straight well is expanded chamber with the connection and is connected, institute State surface of the head end positioned at the end of the mining straight well of mining straight well.
7. coal bed gas extraction system according to claim 6, it is characterised in that the drainage from coal seam system also includes ground Horizontal well, the surface water horizontal well includes horizontal segment and vertical inclination section, and the end of the horizontal segment connects expansion chamber phase with described Connection, the head end of the horizontal segment is connected with the end of the vertical inclination section, and the head end of the vertical inclination section is opened in On ground, the vertical inclination section is parallel to the mining straight well.
8. coal bed gas extraction system according to claim 7, it is characterised in that the end of the suction wells and the level The end of section is located in same level.
9. the coal bed gas extraction system according to claim 1-8 any one, it is characterised in that set in the suction wells There is screen casing, the end of the screen casing is expanded chamber with the connection and is connected, and the head end of the screen casing is connected with the mining pipeline.
10. a kind of method of construction of coal bed gas extraction system, it is characterised in that comprise the following steps:
S1. planned according to development, determine that the position of chamber is expanded in connection in the coal seam for store coal bed gas, and be drilled with out institute State connection and expand chamber;
S2. mining pipeline is laid, bearing of trend of the mining pipeline along tunnel is laid, and the mining pipeline is negative-pressure pipeline, The mining pipeline includes the output end for being used to export coal bed gas, and the output end is extended on ground;
S3. suction wells are drilled with, the end of the suction wells is expanded chamber with the connection and is connected, the head end of the suction wells and institute Mining pipeline is stated to be connected.
CN201710326109.8A 2017-05-10 2017-05-10 Coal bed gas extraction system and method for construction Pending CN107152261A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109162678A (en) * 2018-11-08 2019-01-08 中国神华能源股份有限公司 Coal bed gas pumping method
CN109403926A (en) * 2018-10-31 2019-03-01 中国神华能源股份有限公司 Implement the method for the coal bed gas of underground mining multilayer coal in a main entry
CN109630071A (en) * 2018-11-30 2019-04-16 中国神华能源股份有限公司 Coal bed gas pumping method

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CN1563664A (en) * 2004-03-29 2005-01-12 柴兆喜 Well of coal-bed gas
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CN102116167A (en) * 2011-01-25 2011-07-06 煤炭科学研究总院西安研究院 Ground and underground three-dimensional extraction system of coal seam gas
CN104989330A (en) * 2015-08-03 2015-10-21 中国神华能源股份有限公司 Coalbed gas recovery method
CN106437632A (en) * 2016-11-09 2017-02-22 山西潞安矿业(集团)有限责任公司 Coal ore long goaf zone Vans drainage method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5944104A (en) * 1996-01-31 1999-08-31 Vastar Resources, Inc. Chemically induced stimulation of subterranean carbonaceous formations with gaseous oxidants
CN1333858A (en) * 1998-11-20 2002-01-30 Cdx天然气有限公司 Method and system for accessing substerranean deposits from the surface
US6598686B1 (en) * 1998-11-20 2003-07-29 Cdx Gas, Llc Method and system for enhanced access to a subterranean zone
CN1563664A (en) * 2004-03-29 2005-01-12 柴兆喜 Well of coal-bed gas
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CN102116169A (en) * 2011-01-27 2011-07-06 中国矿业大学 Drainage method for pressure-relief gas baseboard stonehead of protected seam
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CN106437632A (en) * 2016-11-09 2017-02-22 山西潞安矿业(集团)有限责任公司 Coal ore long goaf zone Vans drainage method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109403926A (en) * 2018-10-31 2019-03-01 中国神华能源股份有限公司 Implement the method for the coal bed gas of underground mining multilayer coal in a main entry
CN109162678A (en) * 2018-11-08 2019-01-08 中国神华能源股份有限公司 Coal bed gas pumping method
CN109630071A (en) * 2018-11-30 2019-04-16 中国神华能源股份有限公司 Coal bed gas pumping method

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