基于流管法低渗透油藏开发数值模拟研究

Numerical Simulation Research for Low-Permeability Reservoirs Based on Stream-Tube Model

针对低渗透油藏普遍存在启动压力梯度这一特点,应用流管法进行油田的实际开发效果评价数值模拟研究。建立了一注一采概念模型,求解模型并且绘制了该概念模型的流管法渗流模板,给出了渗流模板进行油田开发动态分析的方法,进行概念模型饱和度场对比,验证采用流管法进行模拟研究的正确性。应用流管法分别进行常规油藏X6区以及存在启动压力梯度低渗透C55区数值模拟,验证流管法应用于油田实际数值模拟研究的适用性。研究表明,流管法适用于常规油藏以及考虑启动压力梯度的低渗透油藏的数值模拟研究,能够准确的评价小层的动用程度和反映剩余油分布情况,描述低渗透油藏因启动压力梯度而存在无法有效动用区域的特点。

Actual reservoirs numerical simulation was conducted with stream-tube method aiming at the point that threshold pressure gradient existed in low-permeability reservoirs. One injection well and one production well conceptual model was established, the stream-tube fluid layout was drawn, the method of analyzing water flooding dynamic analysis was elaborated, comparison between the water saturation field of the conceptual model was made, and its validity was proved. Numerical simulation research of normal block X6 and low-permeability of threshold pressure gradient block C55 were made, also the validity of stream-tube method applied on actual blocks were proved. The research show that numerical simulation research with stream-tube method could accurately evaluate produced degree and reflect remaining oils distribution when it was applied on both normal and low-permeability reservoirs, and it could also accurately describe the feature that low-permeability reservoirs hardly get effective producing degree for its threshold pressure gradient.