聚合物驱合理黏度比实验研究——以大港油田港西三区为例

Experimental study on reasonable viscosity ratio in polymer flooding: taking block 3 of Gangxi area in Dagang Oilfield as an example

以大港油田港西三区储层和流体为实验对象,开展了聚合物驱合理黏度比实验研究。结果表明:随黏度比(μp/μo)、岩心平均渗透率和渗透率变异系数增加,聚合物驱采收率增幅扩大;随原油黏度增大,聚合物驱采收率增幅降低。从技术效果和经济效益两方面考虑,聚合物驱合理黏度比(μp/μo)约为1。

According to the reservoir characteristics,development status and existing problems in polymer flooding in Block 3 of Gangxi area in Dagang Oilfield,based on the deep research of the polymer flooding mechanism and theory,using the theories of physical chemistry,polymer materials science and reservoir engineering as guidance,the reasonable viscosity ratio( μP/μo) of polymer flooding in the block is studied by means of physical simulation experiment under the specific reservoir and fluid condition. The results show that,the increment of oil recovery of polymer flooding increases with the increase of viscosity ratio( μP/μo),core average permeability and permeability variation coefficient,and it decreasee with the increase of crude oil viscosity. Comprehensively considering technical and economic effects,the reasonable viscosity ratio( μP/μo) in polymer flooding should be about1. The research results will play an important guiding role to improving the effect of polymer flooding in Block 3 of Gangxi area in Dagang Oilfield.