低渗油藏非线性渗流压力分析

针对低速渗流,推导出存在启动压力梯度的非线性渗流试井分析模型,给出拉氏空间解和典型曲线理论图版;结合数据光滑、曲线自动拟合和历史拟合技术,编制了低渗非达西渗流的试井软件。通过三个油田若干口井的实例得到了满意的解释结果:消除了用达西渗流模型解释存在不渗透边界的假象,有效地解释了低渗透油藏非线性渗流压力资料(包括试井早期资料),并获得启动压力梯度值。对合理高效开发低渗油田具有重要理论和实际意义。

Pressure Analysis for Non-Linear Percolation Flow in Low Permeability Reservoir

To low speed percolation flow, the model of well testing analysis for nonlinear percolation with starting pressure gradient is deduced and the laplace space solution and typical curve theoretical plate is presented. Combing with the technologies of data softness, automatic and history imitate, the well testing software for Non-Darcy percolation flow in low permeability reservoirs compiled. By applications of actual examples in several wells in three oilfields, satisfied interpreting results have been reached which eliminate the false appearance that exists impermeability boundary caused by using darcy percolation flow model and interpret effectively non-linear percolation pressure data of low permeability reservoirs and the value of the starting pressure gradient have been got. It has an important theoretical and practical significance for rational and efficient development of low permeability reservoir.