The subterrene drilling method is a new excavation technology.
热熔钻进是一种新式钻进技术。
However, the disposal of drilling mud has remained a difficult problem in drilling method.
钻井法目前已广泛应用于矿山建设工程，但钻井泥浆的处理一直是钻井法难点问题之一。
However, the disposal of drilling mud has remained a difficult problem in drilling method.
钻井法目前已广泛应用于矿山建设工程，但钻井泥浆的处理一直是钻井法难点问题之一。
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