Abstract
This paper discusses the new progress and field application of CO2 flooding in low permeability reservoirs enhanced oil recovery. The study shows that CO2 flooding can improve the oil recovery rate of low permeability oilfield by more than 10%. The practice shows that the liquid CO2 injection in low permeability reservoir is easier than water injection, and the reservoir generally has better CO2 storage.
Highlights
The existence of natural fractures in low permeability reservoir has a negative effect on water injection development in oil field
The CO2 flooding project in the Kelly-Snyder oilfield and the Chao-She oilfield in China is an example. They basically belong to the medium-high permeability reservoir, the CO2 flooding oil recovery ratio is more than 10%
This paper discusses the effect of CO2 flooding to improve the recovery ratio of low permeability reservoir and the effect of CO2 sequestration [7]
Summary
The existence of natural fractures in low permeability reservoir has a negative effect on water injection development in oil field. The recovery ratio of ultra low permeability reservoir is lower, less than 19% [1]. The development of many oilfields abroad and domestic shows that CO2 flooding can improve more recovery than water flooding [2]. The CO2 flooding project in the Kelly-Snyder oilfield and the Chao-She oilfield in China is an example. They basically belong to the medium-high permeability reservoir, the CO2 flooding oil recovery ratio is more than 10%. This paper discusses the effect of CO2 flooding to improve the recovery ratio of low permeability reservoir and the effect of CO2 sequestration [7]
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