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Abstract
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The water injection process can improve the performance of the production operation by maintaining
reservoir pressure. The decrease in rock permeability due to salt precipitation usually occurs by mixing
formation and injection waters. One way to reduce the formation damage is the reduction of ion
concentrations in the injection water. Low salinity water injection (LSWI) reduces the formation damage,
and can turn the reservoir from oil-wet to water-wet. In this work, a reservoir model with four production
wells and one injection well was utilized to analyze the recovery factor, total production rate, and water
cut. The production was evaluated in periods. For the first 20 years, the production was carried out
without water injection. Then, for 20 years, the water was injected at concentrations of 50000, 25000,
10000, 5000, and 4000 ppm. The simulation results showed the recovery factor after 20 years without
water injection was about 28%. After water injection, the recovery factor was increased by 9.8% (at
50000 ppm) and 14.8% (at 4000 ppm). Also, the production rate was increased by decreasing the water
salinity. The water cut was reduced by decreasing salinity and, as a result, oil production increased. The
optimum salinity was 5000 ppm.
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