本文特别研究设计了CBA型局部气举反循环钻具，对钻进所需的空气压力和压气量给出了计算公式。
Also a CBA local air reverse circulation tool is designed with the required air pressure and consumption calculation formula given.
本文特别研究设计了CBA型局部气举反循环钻具，对钻进所需的空气压力和压气量给出了计算公式。
Also a CBA local air reverse circulation tool is designed with the required air pressure and consumption calculation formula given.
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