Paper: Michael Raines, Kinder Morgan CO2 Co., Wayne Helms, Rotary Laboratories, Inc

For CO2 flood modeling the complex geology at the Pennsylvanian SACROC Unit, new core was obtained by utilizing several new techniques to preserve key features or provide adequate detail on the analysis, including analysis of twelve-inch whole core samples. To maximize the value of new core data for model development and scale-up exercises, a "scale down" exercise was performed on selected samples: twelve inch whole core samples were analyzed then cut into six inch whole cores, two inch whole cores, and selectively plugged. Various analyses were run on each of the smaller steps to quantitatively evaluate the effects of sample size. This analysis shows Kv is sensitive to sample size, and smaller samples tend to overestimate Kv compared to their longer counterparts, especially in ranges less than 10 millidarcies. The modeling implication is that cores analyzed with standard methods may not adequately sample barriers to vertical flow.