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Summary This paper shows that the water-alternating-gas (WAG) process may improve sweep efficiency and gas-condensate recovery compared with continuous cycling in highly stratified reservoirs. The study used extensive numerical simulation to investigate the sensitivity of the process to several variables, including reservoir layering, permeability, relative permeability, capillary pressure, and trapped gas. The process mechanics were confirmed by laboratory displacements in layered core.
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Cullick et al. (1993) studied this question.
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