Abstract
Oilfield waters must be considered in all enhanced oil recovery (EOR) operations. This is true for several reasons. There are about seven major EOR techniques: (1) steam injection, (2) in situ combustion, (3) carbon dioxide injection, (4) surfactant-polymer injection, (5) polymer injection, (6) alkaline (caustic) injection, and (7) injection of petroleum miscible hydrocarbons. The importance of water in EOR technology becomes obvious when one considers the amount of water necessary to recover one barrel of oil. Water is important in EOR operations. Adequate considerations should be given to the type, quality, and quantity of water available. Necessary tests should be made to insure that the water used is compatible with the EOR technology planned, the reservoir rock, and associated indigenous fluids. After the EOR operation is started, necessary tests should be conducted on a routine basis to insure that the system is maintained at optimum conditions.
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