高粘高盐非均质油藏聚/表二元复合驱合理粘度比优化分析

Optimization Analysis of Reasonable Viscosity Ratio of Polymer/Surfactant Combination System in High Viscosity and High Salt Heterogeneous Reservoir

聚/表二元复合驱油技术是特高含水期油藏"稳油控水"的重要技术措施之一。通过岩心驱替实验对高粘高盐非均质油藏聚/表二元复合体系驱油效率及其影响因素进行分析研究,并对聚/表二元复合驱采收率与渗透率变异系数之间的相关性进行研究。结果表明,聚/表二元复合体系驱油效率受岩心渗透率变异系数V_K、原油粘度μ_o和粘度比(μ_(sp)/μ_o)综合影响,在粘度比(μ_(sp)/μ_o)和岩心参数固定条件下,随μ_o增加,水驱和化学驱采收率减小,采收率增幅下降。从技术角度考虑,结合实际情况得到目标油藏非均质储层聚/表二元复合驱合理粘度比。

In recent years,the technology of polymer/surfactant combination system has been one of the very important measurements for developing reservoir in late high water cut stage.With the theoretical guidance of reservoir engineering and chemicophysics,this research has studied the effect of oil displacement efficiency of polymer/surfactant combination system for KJ high viscosity and high salt reservoir oilfield by using experimental means,and studied the correlation between coefficient of recovery and variation coefficient of permeability.The result showed that,the effect of oil displacement efficiency of polymer/surfactant combination system is influenced by the comprehensive factors including variation coefficient of permeability(V K),crude viscosity(μo)and the viscosity ratio(μs p/μo).Under the circumstance of constant viscosity ratio(μs p/μo)and the core parameters,and the recovery ratio of waterflooding and chemical flooding will decrease,and the amplification of recovery ratio will decrease.Comprehensively considering technical effect,the reasonable viscosity ratio(μs p/μo)of polymer flooding in will be obtained.