The under-balanced drilling technology is based on how to control the bottom negative pressure which is related to the pressure computation of multiphase flow in annulus .
井底负压值控制是欠平衡钻井技术的基础，而井底负压值的大小与环空多相流的有关压力计算有关。
Calculation results show that they accurately reveal the distribution pattern of pressure in wellbore during under-balanced drilling operation.
计算结果表明，该套公式较为精确地模拟了欠平衡钻井过程中井眼压力分布的规律。
Calculation results show that they accurately reveal the distribution pattern of pressure in wellbore during under-balanced drilling operation.
计算结果表明，该套公式较为精确地模拟了欠平衡钻井过程中井眼压力分布的规律。
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