Chemically Enhanced Water Alternating Gas
Introduction
Chemically Enhanced Water Alternating Gas
After the initial pressure depletion, a significant amount of oil remains in the hydrocarbon reservoir. To develop the oil field, a variety of recovery techniques must be employed, such as water flooding, miscible gas injection, and miscible water alternating gas (WAG) injection, all of which are required to recover a significant part of the reservoir’s oil. Since the late 1950s, WAG injections have been widely used. Recently, WAG processes, immiscible and miscible, have received much attention. Due to its successful results, WAG injection has long been considered by the oil and gas industry as a method for recovering oil from hydrocarbon reservoirs. WAG projects are designed to control oil mobility and reduce viscous fingering through the combination of water flooding and gas injection, ultimately improving oil recovery. This chapter presents an overview of the WAG theory, applications, and mechanisms. The chapter discusses the main issues and technical challenges associated with WAG programs, along with their remedies. A variety of variables, including reservoir properties, fluid behavior, and process parameters, are investigated using experimental studies.