An analytical model for water/gas miscible displacements
This paper describes the solution to a steady-state analytical model for gravitational segregation in a water-alternating-gas (WAG) miscible displacement. The model, introduced by Stone, provides a conceptual framework for understanding the segregation process. The analysis is extended in this paper to obtain a closed-form solution to the equations, which allows one to easily estimate the incremental recovery above waterflooding for homogeneous reservoirs. This solution is useful in the design of high-recovery WAG floods. Results from the model indicate that recovery increases with dimensionless viscous-gravity ratio (VGR), which is a measure of the volume in the reservoir required to obtain complete segregation of water and gas injected into a well. The model may be used to show how changes in fluid and operating conditions affect recovery. Recovery may be increased either by increasing injection rate or solvent viscosity, or by reducing pattern area or water-solvent density difference.
- Research Organization:
- Exxon Production Research Co.
- OSTI ID:
- 6827281
- Report Number(s):
- CONF-8304162-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE/DOE 12632; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Vertical conformance in an alternating water-miscible gas flood
Improvement of Sweep Efficiency in Gasflooding
Related Subjects
020300* -- Petroleum-- Drilling & Production
CHEMICAL COMPOSITION
DISPLACEMENT FLUIDS
ENHANCED RECOVERY
FLOW RATE
FLUID INJECTION
FLUID MECHANICS
FLUIDS
GASES
HYDROGEN COMPOUNDS
MATHEMATICAL MODELS
MECHANICS
MISCIBLE-PHASE DISPLACEMENT
OIL SATURATION
OIL WELLS
OXYGEN COMPOUNDS
PHASE STUDIES
RECOVERY
RESERVOIR FLUIDS
RESERVOIR ROCK
SATURATION
SEGREGATION
SIMULATION
WATER
WELLS