一、基本情况我大队于1975年开展了小口径人造金刚石钻进试验。五年来,取得了比较显著的效果。1975年试验初期,我们只开动了一台试验钻机,本着实践——认识——再实践的精神,坚持“积极领导,稳步发展”的方针,在实践的基础上提高,在提高的基础上推 First, the basic situation I brigade in 1975 launched a small diameter synthetic diamond drilling test. In the past five years, more remarkable results have been achieved. In the beginning of the 1975 trial, we only started a pilot drilling rig. In the spirit of practice, knowledge and practice, we adhered to the principle of “active leadership and steady development”, increased on the basis of practice, Push on the basis