Two phase immiscible displacements in the ultracentrifuge were used fo
r the determination of the relative permeability characteristics of a
variety of systems including Berea sandstone. Baker dolomite and plugs
from the Rainbow Keg River Reefs. The transient production data for e
ach plug were collected and were used for the estimation of the relati
ve permeabilities. A computer simulation algorithm was developed for t
his purpose. The program uses explicit history matching of the product
ion data by fitting them using Corey type exponents for the relative p
ermeability. Both oil flood and water flood data were utilized. The pa
per describes the experimental procedure, the development of the model
and representative experimental results. In general, the proposed alg
orithm better fits the tighter carbonate samples rather than the data
from the more permeable samples. The simulation seems to be very sensi
tive to the capillary pressure data.