Chongqing Research Institute, China Coal Technology and Engineering Group National Key Lab of Gas Disaster
Monitoring and Emergency Technology

针对松软突出煤层松软、透气性低、施工瓦斯抽采钻孔成孔率低等问题,开发出全孔段下放筛管瓦斯抽采技术,并在平煤十矿、新集一矿对该技术进行了现场试验。结果表明:松软突出煤层全孔段下放筛管技术的筛管下入率可达97%以上,与传统退钻裸眼瓦斯抽采技术相比,平煤十矿的单孔平均瓦斯抽采浓度可提高2倍以上,单孔平均瓦斯抽采量可提高3.5倍以上;与普通下放筛管瓦斯抽采技术相比,新集一矿的瓦斯抽采浓度提高近1倍,达到了预期效果。

According to the soft seam, low permeability, low borehole completed rate of the gas drainage borehole drilled and other problems of the soft and outbur st seam, a technology of screen pipe putting down along full length borehole for gas drainage was developed. The technology was applied to the site experiment in Ping mei No.10 and Xinji No. 1 Mine. The results showed the screen pipe putting rate for the technology of screen pipe putting down along full length borehole was over 9 7%. In comparison with the conventional drilling rod withdrawing and open hole technology, the average concentration of gas drainaged from a single borehole in Pingm ei No.10 mine increased by over two times and the average quantity of gas drainaged from a single borehole could increase by 3.5 times. In comparison with the norm al dilling rod withdrawing and screen pipe putting down technology, the concentration of gas drainaged in Xinji No.1 Mine was increased by one time nearly and the ex pected effect was reached.

国家科技重大专项资助项目(2011ZX05041-002)；