Abstract
Pore-throat ratio is a significant parameter expressing the characteristics of reservoir pores. It has an apparent influence on viscoelastic polymer solution flow in micro-pores. In this article, Upper-Convected Maxwell (UCM) equation is adapted to describe the viscoelastic polymer behavior. The contraction channel models of different pore-throat ratio are selected in process of simulation. And contours of stream function and velocity of different Weissenberg number (We) are calculated and drawn by Finite Volume Method. Results show that, vortex will occur at the re-entrant corner caused by the sudden contraction of channel, size and intensity of the corner recirculation vortex. The residual oil region is reduced and the mobile oil region is enlarged. Microscopic sweep efficiency is increased relatively. Vortex will be larger and stronger, and the velocity will be increased for We. Vortex will be lager with the bigger pore-throat ratio. Micro-sweep efficiency will be capitalized by viscoelastic polymer solution to the utmost.
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