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本文通过理论分析和数值模拟,研究了具有层间越流的多层油藏被分隔为两个层段进行不稳定试井时的流动情况;指明压降曲线的半对数图和压力恢复曲线的赫诺图都具有两个直线段,据此可以决定测试层段及全油藏的产能系数,对于两层油藏尚能决定表皮系数。在第二直线段期间两层段的井底压差将趋于稳定,该稳定值决定层段间低渗透夹层的垂向渗透率。另外还阐明了各层井底压力的不同和导压系数的不同是造成层间越流的两个原因,分析了这两种越流的性质,同时也给出了在第二直线段期间计算这种越流的方法。
In this paper, through theoretical analysis and numerical simulation, the flow behavior of a multi-layer reservoir with inter-stratified flow is divided into two intervals for unstable well test. The semi-logarithmic plot and pressure recovery curve of pressure drop curve Herzotu has two straight line segments, which can determine the productivity coefficient of the test interval and the whole reservoir. For the two-layer reservoir, the skin factor can still be determined. The bottom hole pressure difference between the two sections will tend to stabilize during the second straight line segment, which determines the vertical permeability of the low permeability interlayer between the segments. In addition, it is also clarified that the difference of bottom hole pressure and the difference of pressure coefficient is the two causes of the over-flow between layers. The properties of these two kinds of over-flow are also analyzed. Meanwhile, This more flow method.