丛式井在王坡矿井煤层气开发中的适应性分析

Adaptability Analysis of Cluster Wells for CBM Exploitation in Wangpo Mining Field

通过对王坡矿井的构造特征、水文地质条件、煤层发育特征、煤储层特征以及地形等条件进行分析,探讨了不同煤层气开发方式的适应性,并结合王坡煤矿开采煤层情况、瓦斯现状,确定3号煤层为煤层气开发的目标煤层。从王坡矿井地形条件,控制面积、集输复杂性及经济效益分析,认为该区不适合采用地面垂直井方式开发煤层气;从构造特征及钻井工艺等方面分析,不宜采用对接井、羽状水平井和水平井煤层气开发方式;丛式井开发方式对地形要求较低、占地面积较小、钻井工艺成熟,经济效益好,可作为王坡矿井进行煤层气开发的首选井型。

Based on analysis of the structural characteristics ,hydro geological conditions, coal seam characteristics, coal reservoir characteristics and terrain conditions, the adaptability of several coalbed methane （CBM） exploitation ways is discussed. Taken into consideration of the Wangpo coal bed mining situation and gas drainage, the target coal seam for CBM exploitation is 3# coalbed. Ground vertical wells are not recommended in Wangpo for its disadvantages of the terrain conditions, controlled area, gathering complexity and economic benefits. Butted wells, fishbone horizontal wells and horizontal wells are not suited to exploit CBM because of the structural characteristics and drilling technology. Because cluster wells of CBM exploitation have several advantages over complex terrains, less occupying area, reasonable drilling techniques and good economic benefits, so it is the most suitable CBM exploitation way in Wangpo.