Steamflood expansion includes liquid redox process

Chevron U.S.A. Production Co. will install a liquid redox process to sweeten associated gas containing H2S from its Cymric cyclic steamflood, Kern County, Calif. The treated natural gas will be used as fuel for steam flooding and other operations. The process replaces the current method of burning gas in 50 MMBTU steam generators and using caustic to scrub SO2 from the stack gas. Chevron says the present system does not provide the needed flexibility for its planned expansion of the field. Chevron selected Dow Chemical Co.'s SulFerox (a registered service mark of Shell Oil Co.) liquid redox technology. The process (Fig. 1) uses an iron chelate that undergoes reduction-oxidation r...

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