Secondary recovery processes using highsulfate ion water sources can lead to reservoir souring. The waterflood operations for the Long Beach Unit of the East Wilmington Field are located in a highly urban and environmentally sensitive location in the Long Beach Harbor, California. One of the Unit's goals is to prevent reservoir souring. In addition, the formation water contains significant amounts of barium ion. Injection of highsulfate water sources results in barium sulfate precipitation and scaling of downhole pumps.

Pilot testing was conducted on membrane technology designed to selectively remove sulfate ion from open-ocean sea water. The pilot operation was installed on Island White of the Long Beach Unit. The process was evaluated to assess technical feasibility, characterize product water for reservoir compatibility, and compile operating data. Laboratory coreflooding experiments were conducted with the product water to evaluate reservoir compatibility because many of the producing zones are damage-prone.

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