井模型对数值试井的影响

Well Model’s Influence on Numerical Well Test

井模型对计算结果有很大的影响。利用UST数值试井软件研究了井作为内边界与作为源汇的两种处理方法对试井曲线的影响。研究表明,若一个区块只有一口井,peaceman井模型与内边界井模型的计算结果基本相同,几乎没有差别。当存在多井、且邻近的干扰导致测试井周围的流动达不到稳定时,peaceman井模型的适用条件不满足,使用peaceman井模型来计算会带来计算误差。但随着井网格的减小,计算误差会降低。同时利用解析解进行了误差分析。

Well model have influence on calculation result.UST numerical well test software is used to study the difference of the well test curves when the well is treated as source-and-sink and inner boundary.When there is only one well in the simulated area and the flow around the well is easy to stable,Peaceman well model and the inner boundary well model have the same results.When the flow around the well is not stable,calculation result is sensitive to the size of the grid.Error is analyzed analyticly.