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怎样合理选用钻机?为了回答这一问题,须从实际出发,并使分析具有现实意义,笔者汇集了1985年川东矿区实际完钻的井深在4000m以内的全部钻井资料,对比数据见下表。
In order to answer this question, it is necessary to proceed from reality and to make the analysis of practical significance. The author has compiled all the drilling data of wells drilled well within 4000m actually drilled in 1985 in the eastern Sichuan mining area. The comparison data are shown in the following table.