一、简况一九七二年十二月,我油田三分部在北京粉末所的支援下,加工了用100号～120号人造金刚石压制的孕镶块150颗,先后在原刮刀取心的硬质合金钻头上,打孔装入刀片刃部。每片刀片外圆镶入四颗,目的是验证孕镶块在井下的抗磨和工作的适应性,是否能达到保径的预期目的,从而增加单只钻头的总进尺。 I. Brief Introduction In December 1972, under the support of Beijing Powder Institute, the Third Division of our oilfield processed 150 pregnant implants with 100 to 120 artificial diamonds, Metals alloy drill, drilling into the blade edge. Each insert has four inserts in the outer ring for the purpose of verifying the wear resistance and workability of the implants in the well and the expected purpose of maintaining the gauge to increase the total footage of a single drill.