溶解气驱油藏水平井流入动态的数值模拟

Numerical Simulation of Horizontal Well Inflow Performance in Solution Gas Drive Reservoirs

针对目前溶解气驱油藏水平井流入动态研究成果对高产和小井径井适用性较差这一问题,本文利用Eclipse油藏数值模拟软件中的多段井模型建立了模拟模型,该模型首次考虑了井筒变质量流对流入动态的影响,且井筒中两相流体的流动由漂移流动模型处理。通过模拟表明:沿井筒单位长度的入流量分布曲线是关于井筒中心的不对称U形分布,井筒压降不可忽略;水平井筒粗糙度越小,井段越长,井身轨迹越靠近中部,溶解气驱油藏水平井的产能越大。

Many current research achievements about solution-gas drive reservoirs inflow performance of horizontal wells may lead to calculation error for high-yield or small-diameter horizontal wells,Aiming at the questions of being,this article establish the simulation model by multi-segment well model in Eclipse Reservoir Simulation Software,which considers the effect of oil-gas two-phase variable mass flow in wellbore on inflow performance of wells,two-phase flow in wellbores are coped with Drift-Flux model.The simulation results indicate that the curve of flow distribution of unit length along horizontal wellbore is asymmetrical U-shaped distribution about center of shaft,wellbore pressure drop is not neglected;the productivity of solution gas drive reservoirs is bigger when horizontal wellbore surface roughness becomes smaller,wellbore length becomes longer,well trajectory becomes closer to the center of reservoir thickness.