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作者所引证的内容为一般钻探工程书籍中所未能提及的，但恰恰又是一般钻探工作人员的疑难问题之一，故特选刊于此，以供参考。
The author quoted the contents of the general drilling engineering books can not be mentioned, but it is also one of the most difficult drilling problems for general staff, so selected for publication here for reference.