streamingly
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Considering gas-solid flow in annular space and BoYun Guo's hydrodynamic parameters model, For aired underbalanced drilling, combined with the minimum energy Angel law and based on the mininum gas injection scale at the key points, it is established a bottom-hole pressure model for gas-solid two phase stream; meanwhile, calculated the downhole depth of the Downhole-Deployment-Valves; and then fabricated the corresponding calculation software. For streamingly underbalanced drilling, it is fully given a step-by-step solution based on analysis from the relationship of various wellbore pressures at the course of underbalanced drilling as well as from the streaming behavior in different wellbore sections, adding consideration on multiphase stream pressure drop and Downhole-Deployment- Valve into account, it is of common application for development wells.
对于气体欠平衡钻井,考虑环空为气固两相流,参考BoYun Guo的流体力学参数计算模型,结合Angel的最小动能法标准,从满足关键点处的最小注气量入手,建立了气固两相流的井底压力计算模型,同时对套管阀的下入深度进行了计算,并利用VB语言编制了相应的计算软件;对于液体欠平衡钻井,考虑环空为多相流,在充分分析欠平衡钻井井内基本压力关系的基础上,从环空多相流压降分析入手,通过对井筒内各段的流态分析,逐段求解。