双渗透聚合物驱油藏不稳定压力动态

针对双渗透聚合物驱油藏,提出试井解释模型,求出该问题的Laplace空间对于有限井眼情况、具有井筒储存和表皮效应情况的分层和井筒压力响应解及分层流量解,讨论了零窜流系数的混合油藏解的有限形式,双渗透油藏的无限作用早期和后期有限形式。这些解可通过Laplace反演变换产生典型曲线,拟合实测井压力资料,分析油藏中非牛顿流体幂律指数及两个层中的渗透率和分层流量。

Transient pressures in a polymer-flooding reservoir with double permeability

A well-test model was developed for a polymer-flooding reservoir with double permeability. The layered and wellbore pressures and rate response solutions are presented for the cases of limiting wellbore area and wellbore storage and skin effect in the Laplace space. The limiting solutions are given for a commingled reservoir with zero crossflow coefficient and for the early and late time limits for an infinite reservoir. These solutions can be used to generate type-curves by inversion of the Laplace transforms to match the well-test pressure data and to determine the non-Newtonian power-law index for the reservoir and the individual layer permeabilities and rates.