Layered layout of high-level directional boreholes and analysis of gas drainage effect
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摘要: 为了提高顶板高位定向钻孔在采空区及上隅角瓦斯治理的效果，提出了高位定向钻孔分层布孔方案，在曙光煤矿开展现场试验，对不同层位高位定向钻孔瓦斯抽采数据和高位定向钻孔整个瓦斯抽采周期内瓦斯抽采效果分析研究，结果表明高位定向钻孔在整个抽采周期内瓦斯抽采效果总体呈波动状态，中间孔段由于处于顶板裂隙带内，瓦斯抽采效果较稳定，两端孔段由于处于钻孔造斜孔段未进入顶板裂隙带内及受前后钻场钻孔搭接影响，瓦斯抽采效果波动较大。为提高高位定向钻孔瓦斯抽采效果，可采用大角度开孔或大角度螺杆马达造斜以降低造斜孔段长度，并增加相邻两钻场钻孔搭接长度，从而降低两端孔段比例，提高中间孔段比例。Abstract: In order to improve the effect of high-level directional drilling in the roof on the goaf and upper corner gas control， a layered arrangement of high-level directional boreholes was proposed， and field tests were carried out in Shuguang Coal Mine. Analysis of gas drainage data of high-level directional boreholes at different depth， and gas drainage effect of high-position directional boreholes in the entire gas drainage cycle showed that gas drainage effect of high-position directional boreholes fluctuated throughout the entire drainage cycle in general. Drainage effect was relatively stable over the middle hole section since it was located in the roof crack zone； while gas drainage effect fluctuated greatly over both top and bottom hole sections since they were located in the build-up sections of the drill holes and did not enter the roof fissure zone， and were affected by the overlap of the drainage holes from the front and rear drill sites. In order to improve gas drainage effect of high-position directional drilling， a large entry angle or a high-bent mud motor can be used to reduce the length of the build-up hole section and increase the overlap length of the drainage holes from the two adjacent drilling sites so as to reduce the proportion of both top and bottom hole sections， and increase that of the middle hole section.
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Key words:
- high-level directional drilling /
- mined-out area /
- gas drainage /
- layered layout /
- drainage cycle
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