04614236 is referenced by 28 patents and cites 22 patents.

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 hydrocarbon and aqueous environment in the reservoir. Under conditions 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.

Title
Self-breaking foamed oil-in-water emulsion for stimulation of wells blocked by paraffinic deposits
Application Number
6/614976
Publication Number
4614236
Application Date
May 29, 1984
Publication Date
September 30, 1986
Inventor
Edward J O Donnell
Huntington Beach
CA, US
David R Watkins
Irvine
CA, US
Agent
June M Bostich
Gregory F Wirzbicki
Dean Sandford
Assignee
Union Oil Company of California
CA, US
IPC
E21B 21/14
B08B 3/08
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