变形介质油藏试井分析方法

在低渗油田的开发中，变形介质对油田开发和试井曲线有一定的影响。基于变形介质的变化规律，建立非线性基本渗流微分方程，对控制方程进行求解，现采用以下两种方法：①对非线性方程进行线性化，然后对线性化控制方程进行近似解析求解；②建立非线性控制方程的数值差分模型，进行数值求解，并在模型中考虑了井筒储存效应和表皮的影响。分析了渗透率变异系数对压力反应的影响，并绘出了相应的试井图版。分析认为变形介质油藏与常规油藏生产动态明显不同。通过数值解与解析解的结果对比，表明近似解析解是适用的。

Well Test Analysis Method for Deformable Media Reservoir

During the development of the low permeability reservoir,it is necessary to consider the media deformation which effect on the reservoir development and well test data. According to the formation deformation theory,the nonlinear fundamental equations were built. By linearizing the equations,the approximate solution was got. Using the finite differential method with considering wellbore storage and skin effect got the numerical solution. The effects of permeability changing coefficient and the well test type curves were given in this paper. According to the result, we conclude that there are many different between the normal reservoir production and that of the deformable media reservoir. By comparing the result of numerical solution and that of analytica1 solution, it demonstrated that the approximate solution is resonable.