KGS--CO2 Project--Enhanced Oil Recovery--5 of 19

Reservoir Criteria and Potential Problems

General Reservoir Criteria

Reservoir Pressure > MMP
Oil Gravity > ~25° API
High S_orw
Good Waterflood Performance

Potential Problems

Reservoir Pressure < MMP
Reservoir Heterogeneity
Fracturing
Asphaltene Precipitation
Viscous Fingering
Low Waterflood Residual Oil Saturation

greater production is possible with low heterogeneity Reservoirs with low heterogeneity will produce more oil than reservoirs with moderate or high heterogeneity because of more even flooding by the injected CO₂.
(after Bell et al., 1995)

The CO₂ will not be able to move oil from zones of non-continuous permeability, and will break through too soon in areas of high permeabilty.

schematic of low and moderate reservoirs and movement of fluids

(after Bell et al., 1995)

Kansas Geological Survey
Updated May 1999
Technical comments or questions to Alan P. Byrnes, Kansas Geological Survey
Web comments to webadmin@kgs.ku.edu
URL=http://www.kgs.ku.edu/CO2/evaluation/slide05.html

Reservoir Criteria and Potential Problems

Potential for CO2 Enhanced Oil Recovery in Kansas

Potential for CO₂ Enhanced Oil Recovery in Kansas