Evaluation of Polymer Flooding for Enhanced Oil Recovery in the Norne Field E-Segment

Evaluation of Polymer Flooding for Enhanced Oil Recovery in the Norne Field E-Segment

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Nowadays various recovery methods like water flooding; gas flooding and etc. are widely used in petroleum industry in order to increase hydrocarbon production as much as possible. Despite the fact water flooding is the main technology for maintaining reservoir pressure and enhancing oil production rate, this technology allows us to recover up to 10-40% of original oil from the fields. The rest amount of oil is divided into two categories: the remaining oil beyond water flooding process and bypassed oil. The purpose of this research is to examine efficiency of polymer flooding for improved oil recovery for Norne field E-segment by doing the simulation study on the black oil reservoir model.
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Nowadays various recovery methods like water flooding; gas flooding and etc. are widely used in petroleum industry in order to increase hydrocarbon production as much as possible. Despite the fact water flooding is the main technology for maintaining reservoir pressure and enhancing oil production rate, this technology allows us to recover up to 10-40% of original oil from the fields. The rest amount of oil is divided into two categories: the remaining oil beyond water flooding process and bypassed oil.

 The purpose of this research is to examine efficiency of polymer flooding for improved oil recovery for Norne field E-segment by doing the simulation study on the black oil reservoir model.

 Firstly, by using Schlumberger’s software Eclipse 100, history matching was performed on the Norne Field E-segment. The history matching was done by adjusting base reservoir model properties, changing the shape of relative permeability curve, skin factor and KH values of production wells. The best possible history match was gained after applying all modifications which are stated above.

 Secondly, before doing field scale enhanced oil recovery research, polymer flooding was simulated and analyzed on three dimensional synthetic model which was built based on rock and fluid properties of Norne field E-Segment. By assuming the model is flat and homogenous the oil recovery with almost 9% was achieved.

 In case of the E-Segment the injector well F-3H was chose for EOR study due to high residual oil saturation around the well compare to F-2H. Two sensitivity analysis: chemical solution concentration effect and injection rate effect were performed to evaluate the efficiency of polymer flooding in E-Segment.

 Due to the fact that the concentration of polymer was high (0.6 kg/m3) and injection rate low (1000-3000 Sm3/day), polymer flooding didn’t give high oil production as it was forecasted. It can be explained as a late introduction of polymer flooding in E-Segment where the mobile oil saturation is low and aquifer mainly affects production profile, and minor increase in oil production can be the result of a small effect of polymer in a close area to production wells.

 The oil recovery increased in the range of 0.5-1% and it allows us conclude that with the reservoir model on which the study was done; polymer flooding is not favorable for Norne field E-Segment as Enhanced Oil Recovery methods.

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