摘要
对于低渗透油藏，流体的流动不符合达西渗流规律，而是呈现出较强的非线性，基于低渗透油田低速非达西渗流模型，考虑动边界的影响。建立了低速非迭西渗流均质油藏试井解释模型，利用多物理场有限元分析软件Comsol Multiphysics进行数值求解，绘制了单重介质的无因次压力降落试井曲线，并对无因次非线性参数的影响进行了分析，结果表明，采用非线性渗流模型所得的压力响应曲线，径向流阶段呈现上翘趋势，上翘幅度介于达西模型和拟启动压力梯度模型之间。实例表明，利用传统的基于达西模型的试井解释应用于低渗透油藏可能会引起误差，用非线性渗流试井解释结果符合实际情况。
For low-permeability reservoirs, the fluid flow does not conform to the Darcy＇s law, hut assumes strong nonlinearness. Based on the low- velocity non-Darey percolation model of low-permeability oilfield, a new well testing model for low-velocity non-Darey percolation in homogeneous oil reservoirs was established in consideration of the influence of moving boundaries. A numerical solution was obtained with the multi-physical-fields finite element analysis software （Comsol Mnltiphysies）. We draw a single medium dimensionless drawdown test curve, and analyze the influences of dimensionless nonlinear parameters. Results show that the Pressure response curves derived from nonlinear percolation models present an upturned trend in the radial flow stage. Its upturned magnitude is between those of the Darcy model and the proposed starting pressure gradient model. Case studies show that the application of traditional well test interpretation based on the Darcy percolation model to low permeability reservoirs may cause errors, while the nonlinear percolation well test interpretation results are in line with the actual situation.
