一、国外地质钻探概况和发势展趋在资本主义国家中,金刚石钻进已成为地质钻探的主要手段,其工作量占总钻进工作量的80%以上,硬质合金钻进只用在表土层和很软的岩层中。金刚石钻探用得最多的国家有瑞典、美国和加拿大。在苏联硬质合金钻进和钢粒钻进仍是主要手段,金刚石钻进1969年只占总工作量的13%左右。瑞典金刚石钻进的速度较高,1968年每 First, the general situation of foreign geological drilling and development trends In capitalist countries, diamond drilling has become the main means of geological drilling, the workload of the total drilling more than 80% of the workload of carbide drilling only used in Topsoil and very soft rock formations. The most widely used diamond drilling countries are Sweden, the United States and Canada. In the Soviet Union cemented carbide drilling and grain drilling is still the main means of diamond drilling in 1969 accounted for only about 13% of the total workload. Sweden diamond drilling speed is higher, 1968 each