Union Oil Company of California

Magna Limited

Diversified Chemical Corporation

Charles A Stout

Charles M Blair, Jr

Eugene C Kozlowski

Raymond P Olsen

Hydrogen sulfide is removed from a water-in-oil emulsion by treatment of the emulsion with sulfur dioxide to convert the hydrogen sulfide to elemental sulfur. The elemental sulfur formed is distributed between the oil phase and the aqueous phase of the emulsion.

Removal of hydrogen sulfide from produced fluids

The method of recovering petroleum from a subterranean reservoir preferably comprising the steps of: (1) introducing through an injection well a predetermined amount of a polyalkylene oxide adduct of a fusible, aromatic hydrocarbon soluble synthetic resin which contains between about 4 to about 16 phenolic groups and is a condensate of a substituted phenol and an aldehyde, said condensate resin being further condensed with ethylene oxide and at least one other alkylene oxide containing 3 or 4 carbon atoms and in such amounts that the weight ratio of condensed alkylene oxide moiety to phenolic resin moiety ranges from about 1-to-1 to about 100-to-1 and the weight percentage of ethylene oxide residues to the total of all alkylene oxide residues ranges from about 20% to about 75%; said adduct (a) being soluble in water to the extent of about 1% or more at 25.degree. C. and (b) said 1% solution having a cloud point of less than about 70.degree. C.; (2) contacting said petroleum in said reservoir with an effective thin film forming amount of said polyalkylene oxide adduct; and (3) introducing into the formation an aqueous medium to urge said petroleum toward and through a producing well.

Oil recovery method utilizing highly oxyalklated phenolic resins

Processes for plugging oil producing formations, fluid thief formations and the like in oil wells and compositions for the same are disclosed.

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Tustin, CA, United States of America

Charles A Stout