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我国煤田钻探自1979年使用绳索取心工艺以来,至今已有七年的历史。从这几年使用的结果来看,经济效益并不明显。为了使绳索取心钻进取得更好的经济效益,必须合
Our coalfield drilling has been in use for seven years since its use in 1979 as a rope coring process. From the results of the past few years, the economic benefits are not obvious. In order to make the rope coring drilling for better economic efficiency, we must together