欠平衡 meaning in English

under balance
underbalance

Safety technology rules for underbalanced drilling
欠平衡钻井安全技术规程
A pool formation analysis for qianmiqiao buried hill structure
千米桥潜山小间隙欠平衡钻井液研究
Under balance pressure drilling technology and coalbed gas development
欠平衡钻井技术与煤层气开发
The evaluation of multiphase phase flow model in under - balanced drilling
欠平衡钻井多相流模型评价分析
Specification for underbalanced drilling technology - part 1 : methods for design
欠平衡钻井技术规范.第1部分:设计方法

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