... 井底压力平衡压井法 balanced bottom hole pressure method 井底岩面 bottom hole patterns 井底油嘴，井底节流器 BCK (bottom choke) ...
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The bench test of three-cone bits and analysis of their bottom hole patterns are the simplest and useful means of checking and improving their design.
三牙轮钻头地面台架试验与井底模式的分析是对牙轮钻头设计的合理性进行检验与改进的最简便又较真实的方法。
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