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中文摘要：
利用流体力学的质量守恒方程、动量守恒方程和地层的渗流力学方程，建立了欠平衡钻井油气藏与井筒耦合流动模型，并利用有限差分方法对模型进行了求解。所建立的欠平衡钻井油气藏与井筒耦合模型能模拟主要油气藏类型欠平衡钻井过程中油气藏流体与井筒内流体的耦合流动，模拟地层油、气的流入对井底压力的影响。欠平衡钻井过程中，不同类型油气藏和井筒流体耦合流动时地层油/气进入动态不同，地层油／气的进入对井底压力的影响规律也有很大区别。计算结果表明地层油／气的流入可以使井底压力下降0．03～2．50MPa，因此在欠平衡钻井设计中，应充分考虑产层段油／气流入对井底压力的影响。图6参15
英文摘要：
To provide theoretical support in underbalanced drilling design, the mass and momentum conservation equations and filtration theory are used to establish the coupled model of oil and gas reservoir flow and wellbore flow. The coupled model is solved using the finite difference method. The coupled model can simulate the coupled flow in different types of reservoirs in underbalanced drilling and reveal the effect of the inflow of formation oil/gas on bottom hole pressure. Calculation results show that bottom hole pressure can be lowered 0.03 2.50 MPa due to the inflow of formation oil/gas. The effect of formation oil/gas inflow on bottomhole pressure should be considered in the design of underbalanced drilling.
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