摘要
为了分析采空区高位定向钻孔设计抽采参数对抽采效果的影响,运用统计方法研究了矿井53个高位定向钻孔的布置参数和抽采数据,确定了合理的钻孔布置层位和平距。以王家岭煤矿12311为试验工作面,试验了不同抽采负压和钻孔孔径下高位定向钻孔的抽采效果,综合判定了高位定向钻孔的最佳抽采负压和合理钻孔孔径,并对高位定向钻孔设计和抽采参数进行了优化,对优化后的钻场抽采效果进行了试验和分析。结果表明:高位定向抽采钻孔的合理布置层位为25~45m,平距为20~60m,最佳抽采负压为22. 7kPa,最优孔径为133mm,优化后瓦斯抽采率提高15. 5%,有效降低了回风流瓦斯浓度。
In order to analyze the influence of design parameters of high level directional drilling on the goaf gas extraction effect,the layout parameters and extraction data of 53 high directional drilling in mine are compared using statistical method,the reasonable layout horizon and spacing of drilling are determined;taking the 12311 working face as test face,the pumping effect of high directional drilling under different negative pressure of pumping and borehole aperture is tested,the optimum negative pressure and reasonable bore diameter of high directional drilling are determined;the design of high level directional drilling and extraction parameters are optimized,and the extraction effect of optimized drilling field is tested and analyzed. The results show that the reasonable level of high directional drilling extraction is 25 ~ 45 m,horizontal distance is 20 ~ 60 m,the best extraction negative pressure is 22. 7 kPa,and the optimal pore size is 133 mm. After the optimization,the gas extraction rate increased by 15. 5%,the return current gas concentration is reduced.
作者
曹文超
龚选平
李红波
高涵
CAO Wen-chao;GONG Xuan-ping;LI Hong-bo;GAO Han(China Coal Energy Research Institute Co.,Ltd.,Xi'an 710054,China;Wangjialing Branch,China Coal Hujin Group Co.,Ltd.,Hejin 043300,China)
出处
《煤炭工程》
北大核心
2020年第5期87-91,共5页
Coal Engineering
关键词
综放工作面
采空区
高位定向钻孔
瓦斯抽采
钻孔孔径
抽采率
fully-mechanized top-coal caving face
goaf
high level directional drilling
gas extraction
drilling aperture
extraction efficiency
