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Petroleum Geosciences: Indian ContextsStudy of CO2 EOR in a Sector Model from Mature Oil Field, Cambay Basin, India

Petroleum Geosciences: Indian Contexts: Study of CO2 EOR in a Sector Model from Mature Oil Field,... [Among various Enhanced Oil Recovery (EOR) methods, gas injection has been proven to be one of the effective ways of enhancing oil recovery from mature fields. The field under study has approached the economic limit of production under conventional recovery methods (primary and secondary recovery). Since start of production in sixties, the field has produced 48.5 % of the initial oil in place and the water cut has increased to 89 % in April 2011. Responding to the industry needs, initially a comprehensive study was performed to evaluate the potential of immiscible CO2 injection for the recovery of residual oil after water flooding in this mature field. This paper presents the preliminary results of immiscible CO2 injection on the basis of laboratory studies and detailed compositional simulations carried out on a sector model of the field. Based on the results obtained from laboratory studies it was found that CO2 injection yields significant incremental recovery. Simulation results show significant increase in field oil production, essentially from 200 to 1100 m3/day and considerable decrease in water cut were observed. In addition, detailed PVT simulations were carried out to obtain an equation of state (EOS) that would better describe the phase changes in the reservoir. These results would form the basis for carrying out CO2 EOR simulations on a field scale.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Petroleum Geosciences: Indian ContextsStudy of CO2 EOR in a Sector Model from Mature Oil Field, Cambay Basin, India

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Publisher
Springer International Publishing
Copyright
© Springer International Publishing Switzerland 2015
ISBN
978-3-319-03118-7
Pages
87 –98
DOI
10.1007/978-3-319-03119-4_3
Publisher site
See Chapter on Publisher Site

Abstract

[Among various Enhanced Oil Recovery (EOR) methods, gas injection has been proven to be one of the effective ways of enhancing oil recovery from mature fields. The field under study has approached the economic limit of production under conventional recovery methods (primary and secondary recovery). Since start of production in sixties, the field has produced 48.5 % of the initial oil in place and the water cut has increased to 89 % in April 2011. Responding to the industry needs, initially a comprehensive study was performed to evaluate the potential of immiscible CO2 injection for the recovery of residual oil after water flooding in this mature field. This paper presents the preliminary results of immiscible CO2 injection on the basis of laboratory studies and detailed compositional simulations carried out on a sector model of the field. Based on the results obtained from laboratory studies it was found that CO2 injection yields significant incremental recovery. Simulation results show significant increase in field oil production, essentially from 200 to 1100 m3/day and considerable decrease in water cut were observed. In addition, detailed PVT simulations were carried out to obtain an equation of state (EOS) that would better describe the phase changes in the reservoir. These results would form the basis for carrying out CO2 EOR simulations on a field scale.]

Published: May 20, 2015

Keywords: Minimum Miscibility Pressure; Cambay Basin; Reservoir Sand; Formation Volume Factor; True Vertical Depth

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