Relative permeability from unsteady-state displacements with capillary pressure included
A semianalytic method for calculation of relative permeabilities from unsteady-state displacement data is developed. The method is based on the simultaneous solution of the fractional-flow equation and an integro-differential equation, derived from the material-balance and Darcy equations for immiscible displacement of two incompressible phases, including the capillary pressure by use of various volumetric relationships. This method for calculating two-phase relative permeabilities from unsteady-state displacement data is not restricted to the high-flow-rate experimental conditions used to overcome capillary and effects. Removal of this restriction allows the analysis of low-permeability cores with water and oil where the flow rates are low and capillary end effects are important. Our method allows direct calculation from the experimental data without intermediate interpretations of graphs.
- Research Organization:
- Oklahoma Univ., Norman, OK (USA). School of Petroleum and Geological Engineering
- OSTI ID:
- 5791606
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Format. Eval.; (United States) Vol. 4:2; ISSN SFEVE
- Country of Publication:
- United States
- Language:
- English
Similar Records
Three-phase relative permeabilities from displacement experiments with full account for capillary pressure
Simultaneous determination of capillary pressure and relative permeability of a displaced phase
Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
CALCULATION METHODS
DARCY LAW
DATA ANALYSIS
DIFFERENTIAL EQUATIONS
DISPLACEMENT FLUIDS
EQUATIONS
FLUID FLOW
FLUIDS
INCOMPRESSIBLE FLOW
PERMEABILITY
RESERVOIR PRESSURE
RESERVOIR ROCK
TWO-PHASE FLOW
WELL PRESSURE