煤矿采动区地面L型顶板水平定向井抽采技术及试验

为解决井下采掘衔接紧张及上隅角瓦斯超限的问题，结合井下高位钻孔抽采与采动区地面直井抽采技术的特点，提出采动区地面L型井抽采技术。在深入分析采动区地面L型井与传统L型定向井区别的基础上，指出该技术的关键点包括井型结构设计和井位层位选择技术、井身层位导向钻进和疏通技术、地面安全抽采控制技术。在山西晋煤集团寺河煤矿3313工作面开展了采动区地面L型井抽采技术试验，结果表明：地面L型井抽采瓦斯浓度平均80%，平均抽采瓦斯纯流量2.2万m³/d，上隅角瓦斯浓度平均降幅46.5%，为工作面瓦斯涌出治理起到关键作用，验证了该技术在煤层气开发及瓦斯涌出治理领域的巨大潜力，为我国煤矿区采煤采气一体化开发提供了新的技术途径。

Coal-bed Methane Extraction Technology and Test by Ground L-type Roof Horizontal Directional Well in Mining Area in Coal Mine

In order to solve the problems of underground mining cohesion tension and gas overrun in upper corner, the gas extraction technology by the ground L-type well in the mining area was proposed according to the characteristics of gas extraction by the underground high-level boreholes and the ground vertical wells in the mining area. Based on the deep analysis of the difference between the ground L-type well and the traditional L-type directional well in the mining area, it was concluded that the key points of this technology should include the design of the well structure and the selection of the well horizon, the directional drilling of the well and dredge of the well horizon, and the control technology for ground gas extraction. The test of the gas extraction technology by the ground L-type well in the mining area was carried out in 3313 working face in Sihe Mine of Shanxi Jincheng Anthracite Mining Group, the test results showed that the average gas extraction concentration by the ground L-type well was 80%, the average pure gas extraction volume was 22 000 m³/d, and the gas concentration in upper corner dropped by 46.5% on an average. This technology has played a key role in gas emission control in the working face, and its great potential in the field of coal-bed methane development and gas emission control was verified. So it provided a new technical way for the integrated development of coal and coal-bed methane in China's coal mines.