August 16, 2025

Numerical Simulation of CO2-N2 Gas Injection with Polymer and Low-Salinity Postflush for Enhanced Oil Recovery in a Moderately Pressured Heavy Oil Reservoir

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Numerical simulation reveals N2-polymer/postflush enhances oil recovery in heavy oil reservoirs, suggesting effective strategies for mature fields.

N2-polymer/postflush resulted in 9.38 MMSTB cumulative oil, indicating the best performance among scenarios tested.
The scenario with co-injection of N2-polymer/postflush shows a water production of only 1,270 MSTB, highlighting improved efficiency.
The study utilized a CMG-based numerical model tailored to field properties to simulate four EOR scenarios in heavy oil.
These findings suggest viable methods to enhance recovery and lower water cut in aging heavy oil systems.

Ehibor et al. (2025) studied this question.

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Numerical simulation reveals N2-polymer/postflush enhances oil recovery in heavy oil reservoirs, suggesting effective strategies for mature fields.