WO2015157812A1 - Systeme et procede de forage polyvalent - Google Patents

Systeme et procede de forage polyvalent Download PDF

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Publication number
WO2015157812A1
WO2015157812A1 PCT/AU2015/050130 AU2015050130W WO2015157812A1 WO 2015157812 A1 WO2015157812 A1 WO 2015157812A1 AU 2015050130 W AU2015050130 W AU 2015050130W WO 2015157812 A1 WO2015157812 A1 WO 2015157812A1
Authority
WO
WIPO (PCT)
Prior art keywords
coal seam
borehole
primary
drilling
primary borehole
Prior art date
Application number
PCT/AU2015/050130
Other languages
English (en)
Inventor
Jan Benjamin Pieter COETZEE
Original Assignee
Peabody Energy Australia
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
Priority claimed from AU2014901360A external-priority patent/AU2014901360A0/en
Application filed by Peabody Energy Australia filed Critical Peabody Energy Australia
Priority to US15/304,136 priority Critical patent/US20170044887A1/en
Priority to AU2015246646A priority patent/AU2015246646B2/en
Publication of WO2015157812A1 publication Critical patent/WO2015157812A1/fr

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Classifications

    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
    • 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
    • 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
    • E21B43/006—Production of coal-bed methane
    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/046—Directional drilling horizontal drilling

Definitions

  • the invention relates to a multi purpose drilling system and method.
  • the invention relates in particular, although not exclusively, to a method of forming a multi purpose drilling for degassing a coal seam that is to be mined.
  • coal seams Before coal seams can be mined, they are typically degassed to remove coal seam gases which would otherwise be lost to the atmosphere and/or pose a danger to the mining operation. Additionally, the coal seam is typically degassed during development, production and after mining (goaf degassing).
  • One prior art solution is to initially drill surface to in seam holes to pre drain the coal seam.
  • vertical goaf gas drainage wells Prior and during production, vertical goaf gas drainage wells are drilled from the surface into a position where the wells can drain the goaf as the longwall is mined, these vertical wells are typically spaced 50 to 200 meters apart.
  • the invention resides in a method of forming a multi purpose drilling for degassing a coal seam that is to be mined, the method including the steps of:
  • the at least one secondary borehole extends from the primary borehole into the coal seam.
  • the step of drilling the primary borehole involves drilling the primary borehole such that the majority of the primary borehole in the zone above the coal seam extends substantially parallel to the coal seam.
  • the step of drilling the primary borehole is performed prior to the step of drilling the at least one secondary borehole.
  • the at least one secondary borehole can be drilled before the primary borehole. For example a secondary borehole is drilled from the surface through a surface casing and into the coal seam, and a primary borehole is then drilled through the surface casing such that it extends from the secondary borehole into the zone above the coal seam (although the secondary borehole was drilled first, it still extends from the primary borehole).
  • the zone is a primary caving zone. More preferably the zone is up to 2.5 times the height of the coal seam, above the coal seam. For example, if the height of the coal seam is 6 meters, the zone is up to 15 meters above the coal seam. In a preferred embodiment, the zone is between 5 to 40 meters above the coal seam. Preferably the zone is between 5 to 25 meters above the coal seam. More preferably, the zone is between 10 to 15 meters above the coal seam.
  • At least a portion of the primary borehole extends parallel or at least at a slight angle to horizontal.
  • at least a portion of the primary borehole may extend parallel to -5° to the coal seam.
  • a benefit of at least a portion of the primary borehole extending parallel or at a slight angle to horizontal is that any water or other liquids in that portion of the primary borehole may be better controlled.
  • the primary borehole is not drilled into an upper coal seam (i.e. a coal seam above the coal seam that is to be mined) in a direction substantially parallel to the upper coal seam.
  • an upper coal seam i.e. a coal seam above the coal seam that is to be mined
  • the primary borehole is drilled such that it has a larger diameter than the average diameter of the at least one secondary borehole.
  • the average diameter of the at least one secondary borehole may be in the range of approximately 180mm ( ⁇ 7") to 300mm (-12") and the diameter of the larger portion of the primary borehole may be in the range of approximately 300mm (-12") to approximately 610mm (-24").
  • the primary borehole is drilled such that the portion of the primary borehole extending substantially parallel to the coal seam is larger in diameter than a portion of the primary borehole adjacent to the surface.
  • the step of drilling the primary borehole involves drilling a pilot hole and reaming at least a portion of the pilot hole.
  • an advance or retreat reaming method may be used to ream at least a portion of the pilot hole.
  • the step of drilling at least one secondary borehole involves drilling one secondary borehole into the coal seam such that a majority of the secondary borehole in the coal seam extends substantially parallel to the coal seam.
  • the method includes drilling branching holes from the secondary borehole that extend into the coal seam.
  • the branching holes extending from the secondary borehole into the coal seam can be in the form of any scatter branching as desired, such as, but not limited to, fan, parallel and/or herringbone patterns or the like or a combination thereof at predefined intervals.
  • the step of drilling at least one secondary borehole involves drilling a plurality of secondary boreholes extending from the primary borehole into the coal seam.
  • the plurality of secondary boreholes are drilled such that they extend from the portion of the primary borehole that extends substantially parallel to the coal seam, and into the coal seam.
  • the plurality of secondary boreholes are drilled at predefined intervals.
  • the plurality of secondary boreholes are drilled in a pattern.
  • the plurality of secondary boreholes may be drilled in any scatter branching as desired, such as, but not limited to, fan, parallel and/or herringbone patterns or the like or a combination thereof at predefined intervals when viewed from above.
  • the step of drilling at least one secondary borehole involves drilling at least one secondary pilot hole and reaming each of the at least one secondary pilot hole.
  • the method includes the step of providing a casing in the primary borehole.
  • the step of providing a casing in the primary borehole involves providing a casing that is at least partially perforated in the portion of the primary borehole that extends substantially parallel to the coal seam.
  • the casing is a fibreglass casing.
  • the casing may be a steel or PVC casing.
  • the casing may be a fire retardant and/or anti static casing. A benefit of providing a casing is that borehole stability is improved.
  • the method includes the step of providing at least one casing in the at least one secondary borehole.
  • the at least one casing is at least one fibreglass casing.
  • the at least one casing may be at least one steel or PVC casing.
  • the at least one casing may be fire retardant and/or anti static.
  • the at least one casing is at least partially perforated.
  • the method includes the step of drilling at least one well from the surface, each of which intersects with the primary borehole.
  • each well is a vertical well.
  • a vertical well includes a well that is substantially vertical.
  • each well is adapted to convey coal seam gas to the surface.
  • the step of drilling at least one well from the surface, each of which intersects with the primary borehole involves drilling the at least one well such that each well also intersects with one of the at least one secondary borehole.
  • step of drilling at least one well from the surface can be carried out before, during or after the primary borehole and/or the at least one secondary borehole is drilled.
  • the method includes the step of determining the location of the coal seam.
  • the method includes the step of determining the coal seam floor. More preferably, the method includes the step of determining the coal seam roof.
  • the method includes the step of determining the location of the zone above the coal seam into which the primary borehole is drilled.
  • the invention resides in a multi purpose drilling system for degassing a coal seam that is to be mined, the multi purpose drilling system comprising:
  • a plurality of multi purpose drilling systems are used to degas a coal seam.
  • FIGs. 1 a-1 e show schematic views of various stages of a multi purpose drilling system according to an embodiment of the invention ;
  • Fig. 2 shows a schematic plan view of part of the multi purpose drilling system of Figs. 1 a -1 e;
  • Fig. 3 shows a schematic view of a multi purpose drilling system according to an embodiment of the invention
  • Fig. 3a shows a schematic plan view of a multi purpose drilling system according to an embodiment of the invention
  • Fig. 4 shows a schematic view of two back to back multi purpose drilling systems
  • Fig. 5 shows a schematic view of two facing multi purpose drilling systems
  • Fig. 6 shows a schematic view two multi purpose drilling systems originating from the same location
  • Fig. 7 shows a schematic view of two overlapping multi purpose drilling systems.
  • Figs. 1 a-2 show a multi purpose drilling system 30.
  • Figs. 1 a-1 c show a sequence of drillings to create a multi purpose drilling system
  • Figs 1 d-1 e show the multi purpose drilling system 30 as the coal seam 12 is progressively mined
  • Fig. 2 shows a plan view of a portion of the multi purpose drilling system 30.
  • a primary borehole 32 is drilled from the surface 10 to above the coal seam 12.
  • the primary borehole 32 transitions to being substantially parallel to the coal seam 12 as it extends in a primary caving zone 14, which is located above the coal seam 12.
  • a perforated casing (not shown) is inserted into the primary borehole 32 (typically during the drilling of the multi purpose drilling system 30).
  • a number of secondary boreholes 36 are drilled such that they extend from the primary borehole 32 into the coal seam 12.
  • the secondary boreholes 36 extend downwardly (as seen in Fig. 1 b) and outwardly (as seen in Fig. 2) from the primary borehole 32.
  • the plurality of secondary boreholes 36 pre drain the coal seam 12 so that longwall panels (22 as seen in Fig. 2) can be developed.
  • the plurality of secondary boreholes 36 continue to drain the coal seam gases.
  • a vertical well 40 is drilled from the surface 10 such that it intersects with the primary borehole 32.
  • the vertical well 40 is adapted to convey coal seam gases to the surface 10.
  • Figs. 1 d and 1 e show the coal seam 12 being mined by a shearer 18, the shearer 18 and the hydraulic jacks 20 advance along the coal seam 12, creating a goaf 16.
  • the coal seam gases from the goaf 16 are drained by the primary borehole 32.
  • a benefit of having a perforated casing in the primary borehole 32 is that the primary borehole 32 remains operational for a longer time in the goaf
  • a benefit of draining the goaf 16 using the primary borehole 32 is that not as many vertical wells 40 are required (compared to the prior art solution of drilling vertical wells every
  • Fig. 2 shows a schematic plan view of part of the multi purpose drilling system 30 in relation to a developed longwall panel 22, defined by a tailgate 24 and a maingate 26.
  • the multi purpose drilling system 30 is typically drilled before the tailgate 24 and maingate 26 are formed and before the longwall panels 22 are developed and the coal seam 12 is mined.
  • the location of the maingate 26 and tailgate 24 are typically predetermined and the drilling system 30 is drilled such that the ends of the secondary boreholes 36 stop short of the respective maingate 26 or tailgate 24.
  • the secondary boreholes 36 typically stop 5-10m short of the respective maingate 26 or tailgate 24.
  • a benefit of stopping short of the respective maingate 26 or tailgate 24 is that this prevents gas from escaping from the drilling system 30 into the maingate 26 or tailgate 24.
  • Fig. 3 shows a further embodiment of a multi purpose drilling system 130.
  • the multi purpose drilling system 130 has a primary borehole 132 that is drilled from the surface 10 to above the coal seam 12. It will be appreciated that drilling can include reaming and that drilling the primary borehole 132 may include reaming a pilot hole.
  • the primary borehole 132 transitions to being substantially parallel to the coal seam 12. It will be understood that in the present specification, substantially parallel to the coal seam 12 includes ⁇ 5° to the coal seam 12.
  • the portion of the primary borehole 132 that extends substantially parallel to the coal seam 12 is preferably 5 to 40 meters above the coal seam 12 depending on the strata and the permeability of the strata above the coal seam. Similar to the embodiment shown in Figs. 1 A-1 E, in the embodiment shown in Fig. 3, a perforated casing (not shown) is inserted into the primary borehole 132.
  • a benefit of having a perforated casing is that the primary borehole 132 remains operational for a longer time after the coal seam 3 has been mined below it.
  • a secondary borehole 136 extends from the primary borehole 132 into the coal seam 12. Branching holes 142 extend from the secondary borehole 136 into the coal seam 12. A casing (not shown) is inserted into the secondary borehole 136. A benefit of casing the secondary borehole 136 is that the casing maintains borehole stability.
  • the primary borehole 132 is drilled before the secondary borehole 136 is drilled.
  • the secondary borehole 136 can be drilled before the primary borehole 132.
  • An advantage of drilling the secondary borehole 136 first is that the coal seam roof can be accurately located (using for example gamma detection from the secondary borehole 136) such that a portion of the primary borehole 132 can be drilled so that it can extend substantially parallel to the coal seam 12.
  • the primary borehole 132 is typically drilled such that the portion of the primary borehole 132 that extends substantially parallel to the coal seam 12 has a larger diameter than the secondary borehole 136.
  • the average diameter of the secondary borehole 136 is approximately 205mm ( ⁇ 8") and the larger diameter portion of the primary borehole 132 has a diameter of approximately 432mm (-17").
  • the larger diameter portion of the primary borehole 132 aids in draining the goaf (not shown) once the coal seam 12 below the primary borehole 132 has been mined.
  • Vertical wells 140 are drilled from the surface 10.
  • the vertical wells 140 are spaced approximately 800 - 1000 meters apart.
  • the vertical wells 140 intersect the primary borehole 132 and the secondary borehole 136.
  • the vertical wells 140 assist in conveying the coal seam gases to the surface 10 as well as draining water and other liquids from the primary borehole 132 and the secondary borehole 136.
  • Fig. 3a shows a schematic plan view of part of the multi purpose drilling system 130 in relation to a developed longwall panel 22, defined by a tailgate 24 and a maingate 26.
  • the branching holes 142 extend from the secondary borehole 136 in a 'herringbone' pattern.
  • Figs. 4, 5, 6 and 7 show various combinations of multi purpose drilling systems used to degas a coal seam 12. It will be appreciated that it can become increasingly difficult to push casing longer distances. For example it may be difficult to push casing further than 1800 meters. As some longwall panels are longer than 1800 meters, it may be necessary to provide more than one multi purpose drilling system to degas a coal seam 12.
  • Fig. 4 shows a tandem configuration, where two multi purpose drilling systems 230, 330 are drilled to degas a portion of the coal seam 12.
  • the portion of the coal seam 12 to be degassed is a proposed longwall panel that extends from a main road 160 to an install road 162.
  • the arrow 164 indicates the direction of mining, from the install road 162 towards the main road 160.
  • the first multi purpose drilling system 230 has a primary borehole 232 that is drilled from the surface 10 to above the coal seam 12 and a secondary borehole 236 that is drilled from the same location as the primary borehole 232 from the surface 10 into the coal seam 12. As can be seen, the secondary borehole 236 extends from the primary borehole 232. The primary borehole 232 and the secondary borehole 236 extend towards the install road 162.
  • the second multi purpose drilling system 330 has a primary borehole
  • the primary borehole 232 and the secondary borehole 236 extend towards the install road 162 from an area close to the ends of the primary borehole 232 and the secondary borehole 236 of the first multi purpose drilling system 230.
  • Vertical wells 240, 340, 344 are drilled from the surface 10 so that they intersect with a corresponding primary borehole 232, 332 and a corresponding secondary borehole 236, 336.
  • the vertical wells 240, 340, 344 are spaced approximately 800 - 1000 meters from corresponding adjacent vertical wells 240, 340, 344.
  • the vertical wells 240, 340, 344 convey coal seam gasses to the surface 10.
  • Fig. 5 shows a facing configuration, where two multi purpose drilling systems 430, 530 are drilled towards each other to degas a portion of the coal seam 12.
  • the portion of the coal seam 12 to be degassed is a proposed longwall panel that extends from a main road 160 to an install road 162.
  • the arrow 164 indicates the direction of mining, from the install road 162 towards the main road 160.
  • the first multi purpose drilling system 430 has a primary borehole 432 that is drilled from the surface 10 to above the coal seam 12 and a secondary borehole 436 that is drilled from the same location as the primary borehole 432 from the surface 10 into the coal seam 12.
  • the primary borehole 432 and the secondary borehole 436 extend towards the install road 162 and intersect a vertical well 544.
  • the second multi purpose drilling system 530 has a primary borehole 532 that is drilled from the surface 10 to above the coal seam 12 and a secondary borehole 536 that is drilled from the same location as the primary borehole 532 from the surface 10 into the coal seam 12.
  • the primary borehole 532 and the secondary borehole 536 extend towards the main road 160 and intersect the vertical well 544.
  • Additional vertical wells 440, 540 are drilled from the surface 10 so that they intersect with a corresponding primary borehole 432, 532 and a corresponding secondary borehole 436, 536.
  • the vertical wells 440, 540, 544 are spaced approximately 800 - 1000 meters from corresponding adjacent vertical wells 440, 540, 544.
  • the vertical wells 440, 540, 544 convey coal seam gasses to the surface 10.
  • Fig. 6 shows a combined configuration, where two multi purpose drilling systems 630, 730 are drilled away from each other to degas a portion of the coal seam 12.
  • the portion of the coal seam 12 to be degassed is a proposed longwall panel that extends from a main road 160 to an install road 162.
  • the arrow 164 indicates the direction of mining, from the install road 162 towards the main road 160.
  • the first multi purpose drilling system 630 has a primary borehole 632 that is drilled from the surface 10 to above the coal seam 12 and a secondary borehole 636 that is drilled from the same location as the primary borehole 632 from the surface 10 into the coal seam 12.
  • the primary borehole 632 and the secondary borehole 636 extend towards the main road 160.
  • the second multi purpose drilling system 730 is drilled from the same location as the first multi purpose drilling system 630 and has a primary borehole 732 that is drilled from the surface 10 to above the coal seam 12 and a secondary borehole 736 that is drilled from the same location as the primary borehole 732 from the surface 10 into the coal seam 12.
  • the primary borehole 732 and the secondary borehole 736 extend towards the install road 162.
  • Vertical wells 640, 644, 740, 744 are drilled from the surface 10 so that they intersect with a corresponding primary borehole 632, 732 and a corresponding secondary borehole 636, 736.
  • the vertical wells 640, 644, 740, 744 are spaced approximately 800 - 1000 meters from corresponding adjacent vertical wells 640, 644, 740, 744.
  • the vertical wells 640, 644, 740, 744 convey coal seam gasses to the surface 10.
  • Fig. 7 shows an Overlapping' configuration (when viewed side on), where two multi purpose drilling systems 830, 930 are drilled towards each other and overlap to degas a portion of the coal seam 12.
  • the portion of the coal seam 12 to be degassed is a proposed longwall panel that extends from a main road 160 to an install road 162.
  • the arrow 164 indicates the direction of mining, from the install road 162 towards the main road 160.
  • the first multi purpose drilling system 830 has a primary borehole 832 that is drilled from the surface 10 to above the coal seam 12 and a secondary borehole 836 that is drilled from the same location as the primary borehole 832 from the surface 10 into the coal seam 12.
  • the primary borehole 832 and the secondary borehole 836 extend towards the install road 162.
  • the second multi purpose drilling system 930 has a primary borehole
  • the primary borehole 932 and the secondary borehole 936 extend towards the main road 160.
  • Vertical wells 840, 844, 940, 944 are drilled from the surface 10 so that they intersect with a corresponding primary borehole 832, 932 and a corresponding secondary borehole 836, 936.
  • the vertical wells 840, 844, 940, 944 are spaced approximately 800 - 1000 meters from corresponding adjacent vertical wells 840, 844, 940, 944.
  • the vertical wells 840, 844, 940, 944 convey coal seam gasses to the surface 10.
  • the present invention involves more cost and a greater amount of work upfront compared to known prior art solutions, the applicant has found that the present invention can save costs, production time and require less work in the long run for pre drainage and drainage of coal seam gases during development, production and after mining(goaf degassing).

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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)
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  • Environmental & Geological Engineering (AREA)
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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

L'invention concerne un procédé de formation d'un forage polyvalent pour le dégazage d'une veine de charbon devant être exploitée. Le procédé comporte les étapes consistant à : forer un trou de forage principal à partir d'une surface dans une zone se situant au-dessus de la veine de charbon, de sorte qu'au moins une partie du trou de forage principal s'étend pratiquement parallèlement à la veine de charbon, et forer au moins un trou de forage secondaire, le(s) trou(s) de forage secondaire(s) s'étendant à partir du trou de forage primaire dans la veine de charbon.
PCT/AU2015/050130 2014-04-14 2015-03-24 Systeme et procede de forage polyvalent WO2015157812A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/304,136 US20170044887A1 (en) 2014-04-14 2015-03-24 Multi purpose drilling system and method
AU2015246646A AU2015246646B2 (en) 2014-04-14 2015-03-24 A multi purpose drilling system and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2014901360A AU2014901360A0 (en) 2014-04-14 A multi purpose drilling system and method
AU2014901360 2014-04-14

Publications (1)

Publication Number Publication Date
WO2015157812A1 true WO2015157812A1 (fr) 2015-10-22

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US (1) US20170044887A1 (fr)
AU (1) AU2015246646B2 (fr)
WO (1) WO2015157812A1 (fr)

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CN108506037A (zh) * 2018-03-19 2018-09-07 中煤科工集团西安研究院有限公司 采煤工作面顶板高位定向钻孔群卸压瓦斯抽采方法
CN108716396A (zh) * 2018-03-30 2018-10-30 兰州城市学院 一种煤层气多分支远端连通井的开发方法
CN109162678A (zh) * 2018-11-08 2019-01-08 中国神华能源股份有限公司 煤层气抽采方法
CN110671042A (zh) * 2019-10-14 2020-01-10 中煤新集能源股份有限公司 一种防灭火钻孔套管施工方法
CN114837555A (zh) * 2022-05-05 2022-08-02 陕西彬长孟村矿业有限公司 羽状多功能定向钻孔布置方法

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CN108533223B (zh) * 2018-02-12 2020-09-11 太原理工大学 一种井下采空区残留煤层气抽采利用系统
CN108301866B (zh) * 2018-04-16 2019-05-07 中煤科工集团西安研究院有限公司 近距离煤层群开采邻近层卸压瓦斯定向钻孔阻截抽采方法
CN108412453A (zh) * 2018-04-24 2018-08-17 淮南矿业(集团)有限责任公司 一种煤炭开采水与瓦斯共治系统及施工方法
CN110306934B (zh) * 2019-07-02 2021-03-19 中煤科工集团西安研究院有限公司 双分支顶板大直径高位定向长钻孔的施工方法
CN110700795A (zh) * 2019-09-06 2020-01-17 太原理工大学 一种用于多分支水平井瓦斯抽采的物理实验箱体
CN113685132B (zh) * 2021-09-07 2022-06-24 中国矿业大学 覆岩移动监测和离层水疏放的地面双孔联合防突水方法

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