WAG MAY IMPROVE GAS-CONDENSATE RECOVERY

This paper shows that the water-alternating-gas (WAG) process may impr ove sweep efficiency and gas-condensate recovery compared with continu ous 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, relativ e permeability, capillary pressure, and trapped gas. The process mecha nics were confirmed by laboratory displacements in layered core.