Review of WAG Field Experience

摘要

In recent years there has been an increasing interest in water- alternating-gas (WAG) processes, both miscible and immiscible. WAG injection is an oil recovery method initially aimed to Improve sweep efficiency during gas injection. In some recent Applications produced hydrocarbon gas has been reinjected in Water-injection wells with the aim of improving oil recovery and Pressure maintenance. Oil recovery by WAG injection has been Attributed to contact of unswept zones, especially recovery of Attic or cellar oil by exploiting the segregation of gas to the top or The accumulating of water toward the bottom.