考虑启动压力梯度的油水两相渗流压力分布

摘要

针对目前低渗透油水两相油藏渗流压力分布规律研究较少,且未考虑含水饱和度沿径向不均匀分布等问题,在充分考虑到水驱前缘突破油井后,含水饱和度沿油藏径向不均匀分布的情况下,建立了考虑启动压力梯度的油水两相径向稳定渗流模型,并推导出了压力分布方程。利用实验数据,结合径向Buckley-Leverett方程获得油水两相启动压力梯度以及两相流度与径向距离r的函数关系,代入到求解的压力分布方程中求出该油藏的最终压力分布,并结合实例进行计算。%Because of rarely studying on pressure distribution of oil-water seepage in low-permeability reservoir and not considering uneven distribution of water saturation along radial direction,a radial oil-water seepage model considering start-up pressure gradient was established under the condition of uneven distribution of water saturation along reservoir radial direction after completely considering waterflood front breakthrough oil well.And a pressure distribution equation was deduced.The functional relation between radial distance （r） and two-phase fluidity and start-up pressure gradient is obtained by adopting radial Buckley-Leverett equation and experimental data.The relationship was put in the pressure distribution equation to obtain the final pressure distribution of the reservoir by combining with an actual example.