Self-breaking foamed oil in water emulsion for stimulation...

Details Self-breaking foamed oil in water emulsion for stimulation... Self-breaking foamed oil in water emulsion for stimulation...

E - Fixed Constructions

21

B

31/14

E21B 21/14 (2006.01)

Patent

CA 1264413

SELF-BREAKING FOAMED OIL IN WATER EMULSION FOR STIMULATION OF WELLS BLOCKED BY PARAFFINIC DEPOSITS ABSTRACT OF THE DISCLOSURE A self-breaking, foamed, oil-in-water emulsion contains a water-immiscible organic solvent for paraffins and asphaltenes, an aqueous nonformation-damaging component, an inert gas, and surface active agents selected to promote a stable foamed emulsion despite contact of the treating fluid with the hydro- carbon and aqueous environment in the reservoir. Under condi- tions of agitation, the treating fluid is a stable foamed emulsion which undergoes spontaneous breakdown into two liquid phases under quiescent conditions. The treating fluid is injected and/or circulated as a stable foamed emulsion to dissolve paraffin and asphaltene-containing deposits from various substrata, such as a subterranean reservoir penetrated by a well, the well itself, or an industrial vessel or conduit. When injection or circulation is stopped, the foamed emulsion spontaneously breaks: down so that the treating fluid can be readily pumped from the well.

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