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首页> 外文会议>2007采矿科学与安全技术国际学术会议 >Application of Tight Radius Drilling in Draining Methane from Low Permeability Coal
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Application of Tight Radius Drilling in Draining Methane from Low Permeability Coal

机译：窄半径钻井在低渗煤排甲烷中的应用

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Methane in coal poses a very real risk to underground mining operations, being both a source of explosions and also outbursts. The problems of coal and gas outburst have become a key factor influencing secure production in the main local producing countries over the world. The most effective way to minimize the risk of methane explosion or outburst is to remove the gas from the coal prior to mining. Many of these coal seams have low gas permeability, making economical extraction of coal gas resource difficult. The Tight Radius Drilling (TRD) system for surface extraction of gas from coal seams is capable of drilling multiple lateral holes, which radiate out from a central conventional drilled vertical well. One TRD well has been drilled at Anglo Australia's Grasstree Mine, for the purpose of pre-draining methane from the German Creek seam prior to underground mining. A total of 1300 meters of laterals were drilled, with the longest lateral being 182 meters. It is apparent that the hole performed well with about 900,000m3 of gas removed and reducing the inseam gas content from an average of 7.8m3/t to an estimated 3.7m3/t. The well drilled at Grasstree proved an invaluable development ground for the TRD technology, with numerous significant advancements to the state of the system being made.
机译：煤中的甲烷对地下采矿作业构成非常真实的风险，既是爆炸的源头，也是爆炸的源头。煤与瓦斯突出问题已成为影响世界主要本地生产国安全生产的关键因素。使甲烷爆炸或突出风险最小化的最有效方法是在开采前从煤中去除瓦斯。这些煤层中的许多煤层具有低的透气性，从而使得难以经济地开采煤气资源。用于从煤层中抽出瓦斯的致密半径钻探（TRD）系统能够钻出多个侧向孔，这些侧向孔从中央传统的垂直井中辐射出来。为了在地下采矿之前从德意志克里克煤层中预抽甲烷，在英美资源集团澳大利亚的格拉斯翠矿已钻了一口TRD井。总共钻了1300米的支管，最长的支管是182米。显然，在去除约900,000 m3的气体并将下se气体含量从平均7.8m3 / t降低到估计的3.7m3 / t时，该井表现良好。在Grasstree上钻的井证明了TRD技术的宝贵发展基础，并且对该系统的状态进行了许多重大改进。

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