Artificial lift design of mishrif formation in Nasiriyah oil field

Abstract EN

The possibility of improving the oil production rate for Mishrif formation in Nasiriyah oil field, located in Thi-Qar Governorate – southern province of Iraq, proposed in this paper.

Electrical submersible pump (ESP) and gas lift techniques were applied to one well (NS-Y) in the studied reservoir.

Firstly, the mathematical model has been built and validation has been done using PIPESIM software in order to select the best correlation (Duns & Ros correlation) for the pressure gradient calculation in the wellbore.

The effect of decreasing reservoir pressure and increasing water cut on production rate has been studied through the evaluation of the well performance.

The production rate was decreased to 1917 STB/D when reservoir pressure reached to 2750 psi, and flow rate decreased to 1210 at water cut 60% .

Therefore, the artificial lift techniques were applied to increase the oil production rate.

The result showed that Gas lift system contributed to increase production rate to (3198) STB/D at reservoir pressure equal to 2750 psi, while using the ESP system improved oil production rate to (2800) STB/D at reservoir pressure 2750 psi.

The results also showed that gas lift system contributed to increase production rate to (3805) STB/D at water cut 60% and ESP raised the production rate to 3087 STB/D at water cut 60% .

The comparison between them showed that the gas lift technique gave the highest production rate at different reservoir pressure and water cut.