The CO//2 injectivity in the Denver Unit, Wasson Field minitest was significantly less than the preflood brine injectivity. Conversely, the CO//2 injectivity in the South Pine injectivity test, in the Cedar Creek Anticline, was greater than the preflood brine. The features which caused these differences in CO//2 injectivity are examined using a model which uses simple nondispersive flow in noncommunicating layers. In this paper, it is shown that the qualitative differences between the Cedar Creek corefloods and the field behavior are due solely to differences in geometry. That is, a single set of centrifuge measured, quasi-native-state, secondary drainage relative permeabilities can be used to predict both the laboratory and field behavior. The primary factors which contribute to the differences between the two field tests are: the fluid/rock properties, the effective wellbore radius or skin, and heterogeneity in the layering.
|Number of pages
|Published - 1988