Abstract: Using the numerical simulation method for partially perforated multilayer reservoir, the characteristics of pressure drawdown and buildup and the influences of low permeability shales between layers on well tests are studied. It is shown that the drawdown and buildup curves have two straight lines. The kh values of perforated layers and the whole reservoir can be determined from the slope of the straight lines. The behavior of the crossflow between layers is explained. The approximate theoretical expressions of crossflows in the second straight line period are given and compared with numerical results.

摘要： 本文使用数值模拟的方法,研究了在部分打开的多层油藏中进行不稳定试井时压降曲线和压力恢复曲线的特征,以及低渗透夹层对它们的影响。计算表明,压降曲线及压力恢复曲线在半对数座标纸上有两个直线段,根据它们的斜率可以确定打开层段及全油藏的kh/μ值。根据计算结果,解释了层间越流的行为;给出了在第二直线段期间层间越流的近似分析表达式,并将它与数值模拟的结果进行对比。

关键词: 不稳定试井, 多层油藏, 层间越流, 压力恢复曲线, 越流量, 直线段, 井底压力, 导压系数, 数值模拟, 压降曲线