第二讲 钻井施工 一、钻井法凿井施工工艺 1.钻进顺序 一般根据钻井直径、钻井深度以及表土层厚占井筒总深度的比例等因素来选择钻井顺序。钻小直径井筒宜用一次全断面钻进。煤矿井筒直径较大,钻井施工多采用一次超前钻孔再分次扩孔的钻井顺序。当基岩部分所占比例小时,采用超前钻孔一次到底,然后扩孔钻进也一次到底,当基岩部分所占比例很大时则采用先钻表土层后钻基岩的钻进顺序。确定钻井顺序应以有利于提高破岩效果和提高钻进速度为原则。 Lecture 2 Drilling I. Drilling Shaft Sinking Construction 1. Drilling sequence Generally according to the drilling diameter, depth of drilling and topsoil thickness of the total depth of the ratio of wells and other factors to choose the drilling sequence. Drilling a small diameter well should use a full cross-section drilling. Coal mine shaft diameter larger, drilling more than once using advanced drilling re-sub-reaming drilling sequence. When the proportion of bedrock parts is small, the advanced drilling is performed once and then the reaming drilling is performed once again. When the proportion of bedrock parts is large, the drilling sequence of the bedrock after drilling the topsoil is adopted. Determine the drilling sequence should be conducive to improving rock breaking effect and improve the drilling speed principle.