A re verse circulation well control method applicable in slim hole was advanced firstly and respective calculation equations were set up.
文中首次提出适应小井眼的反循环并控方法并给出了相应的计算公式。
Brought up the new path for safety and validity to use mid deep hole mine method in Fushun Hongtoushan Copper mine.
为红透山铜矿中深孔采矿方法的安全、高效使用提出了新的途径。
By analysis of the features of small and deep hole machining of stainless steel and the main relative factors, sums up a simple and viable machining method.
针对不锈钢细长孔加工的特点，对整个加工过程中主要相关因素进行了分析，总结出了一种较简便的、切实可行的不锈钢细长孔加工方法。
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