EP3633142B1 - Neuartiges verfahren zur kontrolle von bohrlochgas in stillgelegten minen - Google Patents

Neuartiges verfahren zur kontrolle von bohrlochgas in stillgelegten minen Download PDF

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Publication number
EP3633142B1
EP3633142B1 EP18805598.2A EP18805598A EP3633142B1 EP 3633142 B1 EP3633142 B1 EP 3633142B1 EP 18805598 A EP18805598 A EP 18805598A EP 3633142 B1 EP3633142 B1 EP 3633142B1
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Prior art keywords
water
gas
downhole
drift
mine
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EP18805598.2A
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English (en)
French (fr)
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EP3633142A4 (de
EP3633142A1 (de
Inventor
Zhijun YU
Shuanglin Liu
Yan Zhao
Ming Qi
Qizhi XIANG
Liang BAI
Zhibin Yang
Wei Wang
Wenjun DONG
Yuxiang MA
Guangsheng Chen
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Cecep Ningxia New Energy Resources Joint Stock Co Ltd
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Cecep Ningxia New Energy Resources Joint Stock Co Ltd
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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
    • 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
    • E21F16/00—Drainage
    • 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
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/103—Dams, e.g. for ventilation

Definitions

  • Gas in abandoned mines means methane, which is in an adsorbed or free state, residual in remaining coal seams, surrounding rocks and downhole confined spaces in mines that are closed according to relevant provisions of the state due to the depletion of coal resources or other reasons such as inconformity to requirements and policies on safe production.
  • the utilization of gas in abandoned mines means that gas is extracted and utilized by the existing gas pumping system on the ground, by taking certain blocking measures, before the mines are closed. In China, no successful experience and projects can be found in the field of control of abandoned mines, in spite of some theoretical studies. Although the pumping of gas by ground drilling has already been done in some mines, the real comprehensive control and utilization of gas in abandoned mines is blank yet.
  • the air inlet pipe is connected into the closed roadway and is hung and fixed through hanging hooks, the air inlet pipe is built and grounded in the closed roadway, the situation that gas accumulated in the closed roadway is denoted by discharge sparks generated by static electricity on the air inlet pipe after the roadway is closed is avoided, and the head-on distance between of a pipe opening, on one side of the closed roadway, of the air inlet pipe and the closed roadway is smaller than the effective range of input air flow of the air inlet pipe and is generally smaller than 5 m.
  • the closed roadway is unsealed, the high-concentration gas accumulated in the closed roadway is replaced with fresh air flow in advance and is pumped out by connecting the gas drainage pipe and a coal mine extraction system. While, a GB application No.
  • an objective of the present invention is to provide a novel process for controlling downhole gas in abandoned mines, by blocking downhole drifts in an abandoned mine, forming holes, connecting and reconstructing the gas pumping pipe system, reconstructing the water drainage system, pumping downhole gas by a pumping device on the ground, in order to achieve the purposes of comprehensive control and utilization of gas in an abandoned mine.
  • the technical solution comprises the following steps.
  • the present invention has the following beneficial effects.
  • compressive gas control measures such as blocking downhole drifts in an abandoned mines, reconstructing the downhole gas pipe, reconstructing the pumping of inflowing downhole water, and closing the entrance of the abandoned mine.
  • disasters caused by the accumulation and escape of downhole gas in the abandoned mine and the accumulation of downhole water are avoided.
  • the gas in the abandoned mine can be reused.
  • Great economic, environmental and social benefits can be realized.
  • one embedded pipe 5 that is DN100-DN200 thick is embedded in the blocking walls at a position 0.2-0.3m from the top of the adit.
  • the branched drifts are communicated with the main drift 8.
  • a pipe flange 6 is used outside the embedded pipe to close it. If gas reaches a concentration that can be utilized, the pipe can be directly connected to a downhole gas pumping main pipe 7 by the flange, and then the downhole gas is pumped and utilized by the existing gas pumping device on the ground.
  • the length, width and depth of the water reservoir depend upon the size of the downhole drift, the capacity of the pumping system, and the amount of inflowing water.
  • the water reservoir consists of two water reservoirs connected in series, which are 20m long, 3m wide and 3m deep.
  • a water drainage wellbore 13 is formed on the ground right above the water reservoir, so that the water reservoir is communicated with the ground by the water drainage wellbore 13.
  • a water drainage pump 12 is mounted in the water drainage wellbore. An outlet of the water drainage pump 12 is connected to a water treatment device on the ground. By the water drainage pump, the inflowing downhole water accumulated in the water reservoir is drained, to ensure an enough downhole space to release the stored gas. In this way, the purposes of comprehensive control and utilization of downhole gas in abandoned mines are achieved.
  • a steel-reinforced concrete cover plate 15 is arranged to block the entrance.
  • the distance from the upper surface of the cover plate to the ground, the thickness of the steel-reinforced concrete cover plate, the size of the used steel, the grade of concrete, and the proportion of steel and concrete depend upon the size of the entrance, and will be designed by professional structure design organizations.
  • one or two steel pipes 3 having a diameter of DN300-500mm are embedded in the steel-reinforced concrete cover plate.
  • One end of the embedded pipe extends into the entrance by a length of greater than 15m, and the pipe orifice inside the entrance is open.
  • the other end of the embedded pipe remains on the steel-reinforced concrete cover plate.
  • a pipe flange is welded at 0.5m to 1m from the ground, and the blind flange and the flange are connected by bolts to block the pipe orifice.
  • a sampling device is put into the pipe to sample and analyze the concentration of downhole gas. If gas reaches a concentration that can be utilized, the pipe is connected to the gas pumping system pipe on the ground to pump and utilize the accumulated downhole gas. In this way, the purpose of comprehensively controlling gas in abandoned mines is achieved.
  • a squared stone sealing wall 3 having a thickness of not less than 1m is built with squared stones, cement and sand; then, loess or clay is filled in the loess or clay filling section 20 having a thickness of greater than 20m, up to the adit entrance of the inclined shaft; and then, a squared stone blocking wall 19 having a thickness of not less than 1m is built with squared stones, cement and sand.
  • one or two steel pipes 2 having a diameter of DN300-500mm are embedded in the upper portion of the adit entrance.
  • One end of the embedded pipe 18 extends into the entrance 1 by a length of greater than 20m and is supported by a rack, and the pipe orifice inside the entrance is open.
  • the other end of the embedded pipe remains outside the squared stone blocking wall 19 at the entrance of the inclined shaft.
  • a pipe flange is welded at 0.5m to 1m from the blocking wall, and the blind flange and the flange are connected by bolts to block the pipe orifice.
  • a sampling device is put into the pipe to sample and analyze the concentration of downhole gas. If gas reaches a concentration that can be utilized, the pipe is connected to the existing gas pumping main pipe 22 on the ground to pump and utilize the accumulated downhole gas. In this way, the purpose of comprehensively controlling gas in abandoned mines is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (1)

  1. Verfahren zum Steuern von Gas im Bohrloch einer stillgelegten Mine, wobei das Verfahren die folgenden Schritte umfasst:
    1) vor dem Schließen einer stillgelegten Mine, Blockieren von verzweigten Stollen (1, 2, 3) mit hohem Gasüberlauf an ihren Verbindungsstellen mit einem Hauptstollen durch quadratische Steinwänden (4) und Einbetten von Rohren (5), um Gas zu extrahieren und einströmendes Wasser zu pumpen;
    2) Verbinden der in den quadratischen Steinwänden (4) eingebetteten Rohre zum Extrahieren von Gas mit einem Gaspumprohr (7) im Bohrloch, um ein Gaspumprohrsystem im Bohrloch zu bilden, und anschließendes Pumpen von angesammeltem Gas im Bohrloch in einem stillgelegten Bergwerk durch eine vorhandene Gaspumpvorrichtung am Boden;
    3) Verbinden des verstopften Stollendrainagewassers mit dem Hauptstollendrainagewasser, Bauen eines Wasserreservoirs (11) irgendwo tief am Boden der Mine, Bilden eines Wasserdrainagebrunnens (13) vom Boden zum Wasserreservoir und Montieren einer Wasserablaufpumpe (12) und einer Wasserleitung zum Pumpen von einströmendem Bohrlochwasser zum Boden, um ein normales Pumpen von einströmendem Bohrlochwasser zu erreichen, nachdem die Mine geschlossen ist, wobei ein Einlass der Entwässerungspumpe in 2/3 der Tiefe des Wasserreservoirs eingebracht wird;
    wobei ein Wasserauslass (9) für den verzweigten Stollen (1, 2, 3) in einer unteren Seite der quadratischen Steinwand ausgebildet ist; wobei der Wasserauslass die Form eines Überlaufwasserverschlusses hat; wobei ein Wassertank innerhalb des verzweigten Stollens nahe der quadratischen Steinwand konstruiert ist; wobei das einfließende Wasser in dem verzweigten Stollen in den Wassertank fließt, wenn ein Pegel von angesammeltem Wasser eine Überlaufhöhe erreicht, fließt das einfließende Wasser aus dem verzweigten Stollen aus dem Wassertank heraus; während Gas in dem verzweigten Stollen nicht aus dem Wasserauslass entweicht; das einfließende Wasser, das von jedem verzweigten Stollen überströmt wird, fließt durch einen Entwässerungsgraben (10), der in dem Hauptstollen angeordnet ist, in das Wasserreservoir (11);
    4) nach Beendigung der oben genannten Arbeiten, für einen Stollen schräg schacht, Verschließen eines Eingangs des Stollenschrägschachtes (17) durch Errichten von Innen- und Außenwänden (19, 21) aus Quadersteinen, Zement und Sand, wobei zwischen den Wänden Löss und Ton (20) eingefüllt werden, und Einbetten von Stahlrohren (18), die in die Grube führen, in einem oberen Teil des Eingangs des Stollenschrägschachtes; und bei einem Vertikalschacht einen gesamten Eingang des Vertikalschachtes (14) mit stahlbewehrten Betonabdeckplatten (15) verschließt und Stahlrohre (16) in der Mitte der stahlbewehrten Betonabdeckplatten einbettet, um eine Verbindung des Innenraums mit dem Außenraum zu ermöglichen; und die Verbindung mit dem bestehenden Gaspumpensystem am Boden, um das Pumpen, die Kontrolle und die Nutzung von Gas in einem stillgelegten Bergwerk zu erreichen; und
    5) Verbindung des bestehenden Gaspumpensystems am Boden mit einem Gaspumphauptrohr im Bohrloch, um Gas zu pumpen, wodurch eine umfassende Kontrolle und Nutzung von Gas im Bohrloch in einem stillgelegten Bergwerk erreicht wird.
EP18805598.2A 2017-05-26 2018-04-11 Neuartiges verfahren zur kontrolle von bohrlochgas in stillgelegten minen Active EP3633142B1 (de)

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Application Number Priority Date Filing Date Title
CN201710383542.5A CN107035401B (zh) 2017-05-26 2017-05-26 一种废弃矿井井下瓦斯治理新工艺
PCT/CN2018/082635 WO2018214659A1 (zh) 2017-05-26 2018-04-11 一种废弃矿井井下瓦斯治理新工艺

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EP3633142A1 EP3633142A1 (de) 2020-04-08
EP3633142A4 EP3633142A4 (de) 2021-03-24
EP3633142B1 true EP3633142B1 (de) 2023-03-22

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CN107035401B (zh) * 2017-05-26 2018-04-10 中节能宁夏新能源股份有限公司 一种废弃矿井井下瓦斯治理新工艺
CN107762554B (zh) * 2017-09-15 2019-03-19 徐州工程学院 一种老废弃矿井放置废弃混凝土及封存二氧化碳的系统
CN108180033B (zh) * 2017-11-30 2020-05-15 中国矿业大学(北京) 一种密闭采空区瓦斯释放自动调控装备
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CN109695476A (zh) * 2019-02-19 2019-04-30 中节能宁夏新能源股份有限公司 一种基于gprs数据传输的废弃矿井瓦斯抽采远程监测装置
CN110043315B (zh) * 2019-05-30 2024-03-12 西安科技大学 一种具有抗冲击性的矿井灾变区域快速密闭装置及方法
CN110159226A (zh) * 2019-06-19 2019-08-23 贵州盘江精煤股份有限公司 一种瓦斯治理预留管快速封堵装置
CN110552737A (zh) * 2019-09-03 2019-12-10 海南矿业股份有限公司 一种用于矿井泄水巷的导流装置
CN110748379B (zh) * 2019-11-07 2025-03-21 四川省地质工程勘察院集团有限公司 一种矿井封堵方法及其结构
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EP3633142A4 (de) 2021-03-24
CN107035401A (zh) 2017-08-11
CN107035401B (zh) 2018-04-10
WO2018214659A1 (zh) 2018-11-29
EP3633142A1 (de) 2020-04-08

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