Effect of Wettability on Oil Recovery by Near-Miscible Gas Injection
Authors:
- 1 December 1999
- journal article
- Published by Society of Petroleum Engineers (SPE) in SPE Reservoir Evaluation & Engineering
- Vol. 2 (06) , 558-564
Abstract
Summary: Oil can become bypassed during gas injection as a result of gravitational, viscous, and heterogeneity effects. Mass transfer from the bypassed region to the flowing gas is dependent upon pressure-driven, gravity-driven, and capillary-driven crossflows as well as diffusion and dispersion. The focus of this study is on the influence that wettability has on bypassing and mass transfer. Experimental results reveal comparatively less bypassing occurs in a strongly oil-wet sandstone than in a water-wet sandstone for gravity-dominated, secondary gasfloods. Mass transfer under oil-wet conditions is enhanced, as a result of oil-wetting film connectivity, over that of water-wet conditions, where water shielding is significant.Keywords
This publication has 12 references indexed in Scilit:
- Effect of Wafer Saturation on Oil Recovery by Near-Miscible Gas InjectionSPE Reservoir Engineering, 1997
- Mass Transfer From Bypassed Zones During Gas InjectionSPE Reservoir Engineering, 1997
- Defining the Wettability State of Mixed Wet Reservoirs: Measurement of Critical Capillary Pressure for Crude Oils1996
- Experiments on Bypassing During Gasfloods in Heterogeneous Porous MediaSPE Reservoir Engineering, 1996
- Effect of Injectant Composition and Pressure on Displacement of Oil by Enriched Hydrocarbon GasesSPE Reservoir Engineering, 1995
- Effect of Phase Behavior on Bypassing in Enriched GasfloodsSPE Reservoir Engineering, 1994
- The Effects of Injectant-Enrichment Level on Oil Recovery in Horizontal, Gravity-Tongue-Dominated Enriched-Gas Drives1993
- Effects of Gravity and Viscous Crossflow on Hydrocarbon Miscible Flood Performance in Heterogeneous Reservoirs1992
- Mechanisms of Miscible Oil Recovery: Effects of Pressure on Miscible and Near-Miscible Displacements of Oil by Carbon Dioxide1991
- Optimum WAG Ratio vs. Rock Wettability in CO2 Flooding1985