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苏联最近年来政策连续稳定,地质勘探工作持续发展,取得了较大的成绩,有的方面已经步入世界前列。岩心钻探工作量逐年增长.钻探效率不断提高,钻孔质量得到了保证。有的钻进方法(如钻粒钻进)被逐步
The policies of the Soviet Union have been continuously and steadily developed in recent years and the geological exploration work has continued to develop with great achievements. Some aspects have entered the world’s forefront. The workload of core drilling has been increasing year by year, drilling efficiency has been continuously improved and drilling quality has been guaranteed. Some drilling methods (such as drilling) are gradually