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用回转钻进在卵石层中扩孔成井，不但效率低，钻头损耗严重，并且容易发生卡钻、断钻具等事故，给钻探工作带来很多困难。在毛主席革命路线指引下，经过文化大革命和批林批孔运动，地质战线广大职工，为了突破卵石层成井技术难关，创造了很多宝贵经验。我队用爆破代替钻头扩孔，经过两年来生产试验，取得了初步成功，工效比用钻头扩孔提高3—5倍。
The rotary drilling into the pebble layer reaming into a well, not only inefficient, serious drill loss, and prone to stuck, broken drill and other accidents, to the drilling work to bring a lot of difficulties. Guided by Chairman Mao’s revolutionary line, through the Cultural Revolution and the Punch and Hole Campaign, the majority of workers in the geological front have created many valuable experiences in order to break through the technical difficulties in forming pebble beds. My team replaced the drill with a blasting reaming, after two years of production tests, achieved initial success, ergonomics with a drill to expand 3-5 times.