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- methane drainage borehole 沼气排气钻孔
- Determination for the Methane Drainage Boreholes Parameters in Upper Adjacent Seam of Comprehensively Mechanized Coal Faces 综采工作面上邻近层瓦斯抽放钻孔参数的确定
- High position bores and elevation bores methane drainage technique can prevent gas problem successfully. 采用高位钻孔和仰角钻孔抽放瓦斯技术,有效地防止了瓦斯超限。
- Methane drainage is being performed in 23 gassy coal mines of total major 41 coal producing mines in Poland at present. 目前,在波兰41对主要生产矿井中,有23对高瓦斯矿井进行了瓦斯抽放。
- The study of mining-induced fracture distributions is closely related to some mining engineering problems such as mining under or above water bodies,relieved coalbed methane drainage, overburden bed separation grouting and mining subsidence control etc. 岩层采动裂隙分布的研究与水体下和承压水上采煤、卸压瓦斯抽放、离层区充填与开采沉陷控制等工程问题紧密相关.
- This experiment bases on different permeability in different directions of coal seam cleats.To arrange methane drainage direction the directions vertical and parallel to face cleat are adopted. 根据煤层割理渗透率的各向异性,采用垂直面割理和平行面割理两个方向布置钻孔抽放煤层气。
- The latest progress in the directional drilling system and its various applications including in-seam methane drainage, gob gas drainage, coal mine methane commercial recovery, etc. are presented. 本文介绍了定向钻进系统的最新进展,以及它在许多方面的应用,其中包括煤层内瓦斯抽放,采空区瓦斯抽放,煤层气商业回收等。
- It is confirmed that the initial methane drainage of 100 metre well in direction vertical to face cleat is 1.2 times than parallel direction,and the exhausting coefficient is reduced by 0.537. 测定研究表明:垂直面割理方向钻孔初始瓦斯抽放百米流量是平行面割理方向钻孔的12倍,衰减系数比平行面割理方向钻孔减少了537%25。
- large diameter direct drainage borehole 大孔径直排孔
- Improving Methane Drainage Rate by Cross-Seam Deep Hole Blasting 穿层深孔爆破提高瓦斯抽放量
- He came to look at the drainage. 他是来检查排水设备的。
- The drainage system has been aged. 排水系统已经老化了。
- Study on Application of High - level Boreholes Methane Drainage Technology 高位钻孔瓦斯抽放技术应用的研究
- Applied Study on Deep Hole Standing Shot to Improve Methane Drainage Efficiency 深孔松动爆破提高瓦斯抽放率的应用研究
- Testing study of methane drainage by bore and hydraulic-cutting seam from low permeability coal seam 低渗透煤层钻孔与水力割缝瓦斯排放的实验研究
- Application and Selection of Water-Ring Vacuum-Compressor Pump in Methane Drainage in Coal Mine 水环真空压缩机在矿井瓦斯抽放中的应用和选型
- The drainage of the town is not good, some of the pipes are broken. 城里的排水系统不好,有些水管断裂了。
- Application on Xinji Mine for a Special Blasting Explosive of Three Grade Mine Methane Drainage 三级煤矿瓦斯抽排孔专用爆破药柱在新集一矿的应用
- Methane may have extraterrestrial significance. 甲烷具有星际意义。
- Study on Methane Drainage with the Compound Technique of Perforating and Fracturing 复合射孔技术排放瓦斯的研究
