Abstract
Oil reservoirs are subjected to tertiary recovery by deploying any enhanced oil recovery (EOR)
technique for the recovery of left over oil. Amongst many EOR methods one of the widely applied
worldwide is CO2 flooding through miscible, near miscible or immiscible displacement processes.
CO2 flooding process responds to a number of reservoir and fluid characteristics. These
characteristics have strong effect on overall efficiency of the displacement process. Better
understanding of the effect of different characteristics on displacement process is important to plan an
efficient displacement process. In this work, the effect of stratification resulting in gravity segregation
of the injected fluid is studied in an oil reservoir which is water-flooded during secondary phase of
recovery. Sensitivity analysis is performed through successive simulation on Eclipse300
(compositional) reservoir simulator. Process involves the continuous CO2 injection in an oil reservoir
with more than 1/3rd of original oil in place left after water flooding. Reservoir model with four
different permeability layers is studied. Four patterns by changing the arrangement of the
permeabilities of the layers are analysed. The effect of different arrangement or stratification on
segregation of CO2 and ultimately on the incremental oil recovery, is investigated. It has been
observed that out of four arrangements, upward fining pattern relatively overcame the issue of the
segregation of CO2 and consequently 33% more oil with half injection volume is recovered when
compared with the downward fining pattern.
A. A. Bhatti, S. M. Mahmood, Bilal Amjad. (2013) Effect of Stratification on Segregation in Carbon Dioxide Miscible Flooding in a Water-Flooded Oil Reservoir, Pakistan Journal of Engineering and Applied Sciences, Volume 13, Issue 1.
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