EP3633142A1 - 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
EP3633142A1
EP3633142A1 EP18805598.2A EP18805598A EP3633142A1 EP 3633142 A1 EP3633142 A1 EP 3633142A1 EP 18805598 A EP18805598 A EP 18805598A EP 3633142 A1 EP3633142 A1 EP 3633142A1
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EP
European Patent Office
Prior art keywords
water
downhole
gas
mine
pumping
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.)
Granted
Application number
EP18805598.2A
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English (en)
French (fr)
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EP3633142A4 (de
EP3633142B1 (de
Inventor
Zhijun YU
Shuanglin Liu
Ming Qi
Yan Zhao
Qizhi XIANG
Zhibin Yang
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.)
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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Publication of EP3633142A4 publication Critical patent/EP3633142A4/de
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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

  • the present invention belongs to the field of control of gas in mines, and particularly relates to a novel process for controlling gas in an abandoned mine.
  • 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.
  • 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.
  • 1 branched downhole drift #1; 2: branched downhole drift #2; 3: branched downhole drift #3; 4: blocking wall for the branched downhole drift; 5: embedded pipe; 6: pipe flange; 7: downhole gas pumping main pipe; 8: main downhole drift; 9: water outlet fora branched downhole drift; 10: drainage ditch for the main downhole drift; 11: downhole water reservoir; 12: water drainage pump; 13: water drainage wellbore; 14: main entrance of the abandoned mine; 15:cover plate for blocking the entrance; 16: reserved gas pumping pipe; 17: main inclined shaft in the abandoned mine; 18: pipe embedded in the blocking wall; 19: internal squared stone blocking wall; 20: loess or sand filled section; 21: external squared stone blocking wall; and 22: gas pumping main pipe on the ground.
  • a novel process for comprehensively controlling downhole gas in an abandoned mine is provided.
  • a blocking wall 4 is built, respectively, at a position about 8m from the adit entrance of the branched drifts #1, #2 and #3 in the downhole mining area and goaf in the abandoned mine.
  • a blocking wall having a thickness of about 0.8m to 1m is built with squared stones, cement and sand to block the branched drift, and an external blocking wall having a thickness of about 0.8m to 1m is built with squared stones, cement and sand, with a layer of loess having a thickness of 5m filled between the walls.
  • 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.
  • a system for pumping inflowing downhole water in an abandoned mine is shown.
  • a water outlet 9 for a branched downhole drift is formed in the lower side of the blocking walls.
  • the water outlet is in form of an overflow water seal.
  • a water tank, which is plastered with cement mortar, is constructed inside the branched drift close to the blocking walls. The volume of the water tank depends upon the amount of inflowing water in the branched drift. The inflowing water in the branched drift flows into the water tank.
  • the inflowing water overflown from each branched drift flows into a drainage ditch 10, which is arranged in the main drift and plastered with cement mortar.
  • a water reservoir 11 is formed somewhere low on the bottom of the mine.
  • the water reservoir is an adit dug somewhere lowest on the bottom of the mine.
  • the water reservoir is plastered with cement mortar.
  • 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.

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  • 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)
EP18805598.2A 2017-05-26 2018-04-11 Neuartiges verfahren zur kontrolle von bohrlochgas in stillgelegten minen Active EP3633142B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

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EP (1) EP3633142B1 (de)
CN (1) CN107035401B (de)
WO (1) WO2018214659A1 (de)

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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
CN110939407B (zh) * 2018-09-25 2023-03-31 山西省煤炭地质勘查研究院 一种双层重叠采空区地面抽采井身结构及回收装置
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
CN110905598B (zh) * 2019-12-05 2023-08-29 中煤地质集团有限公司 一种立柱式高角度斜巷钻孔注浆封堵设备及方法
CN111878162B (zh) * 2020-05-27 2023-05-09 中南大学 一种矿山井下泄漏充填砂浆储存设施的清淤排污方法
CN111606451A (zh) * 2020-06-01 2020-09-01 合肥恒翔电子科技有限公司 一种矿用瓦斯泵站智能化水处理系统
CN111720161B (zh) * 2020-07-02 2021-12-07 杨东方 一种煤矿采煤工作面上隅角瓦斯抽采装置
CN111855954B (zh) * 2020-08-25 2024-07-19 贵州大学 一种基于巷道网络的瓦斯逆流试验装置
CN112065503B (zh) * 2020-08-31 2024-11-22 西山煤电(集团)有限责任公司 一种矿井巷道快速封闭方法
CN112096450A (zh) * 2020-09-23 2020-12-18 中南大学 一种防止井下充填管道气蚀和振动的装置及方法
CN113233525B (zh) * 2021-04-29 2023-05-09 中国地质调查局武汉地质调查中心 一种基于地下水流场的硫铁矿山地下水污染修复治理方法
CN113944497B (zh) * 2021-10-14 2023-12-26 平安煤矿瓦斯治理国家工程研究中心有限责任公司 一种废弃矿井井筒气体泄漏防治方法
CN114165274A (zh) * 2021-11-08 2022-03-11 淮北矿业股份有限公司 一种瓦斯抽采循环水泵真空供水装置
CN114961856B (zh) * 2022-06-17 2024-10-11 重庆大学 一种利用废弃淹井煤矿进行水封压气蓄能的方法
CN115420877A (zh) * 2022-08-16 2022-12-02 华晋焦煤有限责任公司 一种h型通风工作面采空区自燃三带监测装置和方法
CN115306480A (zh) * 2022-09-02 2022-11-08 中国矿业大学 一种废弃矿井巷道改造与利用方法
CN116517627A (zh) * 2023-01-11 2023-08-01 中煤科工开采研究院有限公司 煤矿井下密闭墙及其构筑方法
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CN117365619A (zh) * 2023-11-16 2024-01-09 铜陵有色金属集团股份有限公司 一种巷道喷雾系统及其使用方法

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Also Published As

Publication number Publication date
EP3633142A4 (de) 2021-03-24
CN107035401A (zh) 2017-08-11
CN107035401B (zh) 2018-04-10
WO2018214659A1 (zh) 2018-11-29
EP3633142B1 (de) 2023-03-22

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