Document Type : Regular Article


1 Petroleum Technology Department, University of Technology-Iraq, Baghdad, Iraq

2 Petroleum Engineering Department, University of Baghdad, Baghdad, Iraq

3 Department of petroleum technology, University of technology, Baghdad, Iraq


Most of the oil fields inject water as a secondary recovery to maintain the pressure at the reservoir when reservoir natural energy is consumed and pressure is declined during the initial production stage. The disadvantage of using water as injection fluid is that the injected water will tend to finger by the oil because of low viscosity of water compared to oil and moves through the shortest path to the production wells under high water-oil mobility ratio condition, so large amounts of oil are left behind. In order to avoid the high mobility condition of injected water, polymers have been used. It is simply a chemicals dissolved in the injected water and because of the polymer high molecular weight, small amount within several hundred ppm will give significant increase in viscosity of injected water. As a result, it leads to better mobility ratio, reduces fingering effect and increases sweep efficiency. The scope of the current work is to study the effect of polymer injection in porous media on water cut and oil recovery and compare the results with that of water flooding. This study has been done using artificial core with a permeability of 1.82 Darcy and porosity ranging from 32.7 % to 33.7%. Three types of polymers with different molecular weight have been used. Results from artificial core flood experiments show that polymers reduce water cut and improve oil recovery.