Demulsifier for inclusion in injected acidization systems for petroleum formation stimulation
AssigneeTexaco Inc.
InventorRae A. Royle
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Abstract
The formation of stable oil-in-water emulsions in produced fluids from wells undergoing acidization treatment is prevented by the inclusion within the injected acidization chemical mixture of a long chain carboxylic acid ester of a polyhydric alcohol such as sorbitan monolaurate, sorbitan monopalmitate or sorbitan monooleate as a demulsification agent.
Claims5
In an acidization process wherein an aqueous acidizing solution comprising hydrochloric and hydrofluoric acids is injected through a well into a subterranean petroleum formation, the improvement comprising the addition to the acidizing solution of an effective amount of a demulsifier selected from the group consisting of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monooleate, and mixtures thereof.
An acidizing process for treating a subterranean earth formation comprising injecting into a well in contact with said formation an aqueous acidizing solution consisting essentially of hydrochloric acid, hydrofluoric acid, and an effective amount of a demulsifier selected from the group consisting of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monooleate, and mixtures thereof.
Dependencies are inferred from the claim text.