关键词: 油藏模拟, 聚合物驱, 剩余油分布, 影响因素, 原油黏度, 聚合物注入量

Abstract:

A new concept of response remaining oil saturation in polymer flooding was defined on the basis of reservoir numerical simulation. The macroscopic response mechanism of remaining oil was discussed. The places and shapes of response remaining oil in reservoirs with polymer flooding were investigated. The influences of reservoir rhythm, oil viscosity and the amount of polymer injection on the distribution of response remaining oil were analyzed. The research results showed that the response remaining oil vertically distributed in the upper parts of the cross-flow zones and took on the shape of spindle. The response zones were horizontally located between the injected wells and producing wells and took on the circular shape. The response mechanism and distribution of remaining oil were various in the different rhythm formations. The body of response remaining oil moved to the lower parts of formation, and the peak values of response remaining oil saturation declined with the increase of oil viscosity. As the injection amount of polymer increased, the boundary of response remaining oil extended bilaterally along the axis of spindle.

Key words: reservoir simulation, polymer flooding, remaining oil distribution, influential factor, oil viscosity, polymer injection amount