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首页> 外文会议>Annual International Pittsburgh Coal Conference >A NOVEL TECHNOLOGY TO CONTROL THE QUALITY OF PRE-MINING METHANE DRAINAGE
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A NOVEL TECHNOLOGY TO CONTROL THE QUALITY OF PRE-MINING METHANE DRAINAGE

机译：控制瓦斯抽采质量的新技术

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摘要

Advances in our understanding of coal-gas interactions have changed the manner in which we treat coalbed methane: from mitigatingits dangers as a mining hazard to developing its potential as an unconventional gas resource recovered through pre-mining drainage.This study presents a novel technology that has been developed and commercially applied to enhance the concentration of pre-miningmethane drainage. The new technology involves the sealing of fractures around boreholes that may develop into air-leakage paths.Firstly fine expansive particles are injected to these fractures while gas concentration drops . These particles transporte into in-seamborehole driven by the high pressure air. Then particles move randomly within the fractures. Meanwhile particles become to coagulateand block up fractures due to its swelling. As fractures are blocked, air is prevented from entering into the coal seam. As a result, anideal gas concentration can be maintained and the duration of high drainage concentration is extended. Field testing shows thecharacteristics of fractures have been greatly changed after sealing. For the boreholes with an originally low gas concentration(0%~30%), the novel technology can increase the gas concentration by 10%~65% and extend the production time by two to threemore months. The total amount of the extracted gas increase to 2000~3000 m3 per borehole.
机译：我们对煤气相互作用的理解的改变改变了我们处理煤层气的方式：从减轻其作为采矿危险的危险到发展其作为通过开采前排水回收的非常规天然气资源的潜力。本研究提出了一种新颖的技术，已经开发并商业应用以提高开采前甲烷排放的浓度。这项新技术涉及到将井眼周围的裂缝封闭起来，这些裂缝可能发展成漏气路径。首先，在气体浓度下降的同时，将细小的膨胀颗粒注入这些裂缝中。这些颗粒在高压空气的驱动下进入地下孔。然后颗粒在裂缝内随机移动。同时，由于其膨胀，颗粒变得凝结并堵塞骨折。由于裂缝被阻塞，防止了空气进入煤层。结果，可以维持理想的气体浓度并且延长了高排放浓度的持续时间。现场测试表明，密封后裂缝的特征发生了很大变化。对于原本气体浓度较低（0％〜30％）的井眼，新技术可将气体浓度提高10％〜65％，并将生产时间延长两到三个月。每个钻孔的抽采气总量增加到2000〜3000 m3。

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  • 会议地点 Beijing(CN)
  • 作者

    Fubao Zhou; Tongqiang Xia; Shengyong Hu; Jishan Liu; Mingyao Wei; Haijian Li;

  • 作者单位

    Faculty of Safety Engineering China University of Mining Technology Xuzhou Jiangsu 221116Email: fubaozhou@yahoo.com.cn Tel: +86 516 83899753 Fax: +86 516 83995053;

    State Key Laboratory for Geomechanics and Deep Underground Engineering CUMT Xuzhou 221116Email: xtq09cumt@163.com;

    Faculty of Safety Engineering China University of Mining Technology Xuzhou Jiangsu 221116Email: hsyztx@163.com;

    School of Mechanical and Chemical Engineering the University of Western Australia WA 6009 AustraliaE-mail address: jishan@cyllene.uwa.edu.au;

    State Key Laboratory of Geomechanics and Geotechnical Engineering;

    Institute of Rock and Soil Mechanics Chinese Academy ofSciences;

    Wuhan 430071 China Email: cumtwmy@sina.com;

    Faculty of Safety Engineering China University of Mining Technology Xuzhou Jiangsu 221116 Email: haijianlee@126.com;

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  • 关键词

    Particles; Gas drainage borehole; Air-leakage fracture; Sealing; Gas concentration;

    机译：粒子; ;瓦斯抽放钻孔； ;漏气断裂； ;密封； ;气体浓度;

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