Petrolite Corporation

Clearwater, Inc.

Gary A Scherubel

Michael A Thorne

John A Schield

Michael I Naiman

Allen R Fauke

Kevin Schwartz

Robert Reid

Corrosion is inhibited in hydrochloric acid solutions used to acidize wells, by adding to the solutions a corrosion inhibiting composition comprising cinnamaldehyde or a substituted cinnamaldehyde together with a reaction product of a C.sub.3-6 ketone such as acetophenone, thiourea or a related compound, formaldehyde and hydrochloric acid.

Environmentally improved acid corrosion inhibitor

A clayish formation, such as encountered in rock surrounding an oil well bore, is stabilized with a quaternary ammonium salt of an imide of polymaleic anhydride. The invention is particularly relevant to hydraulic fracturing fluids used for enhanced oil recovery.

Polyimide quaternary salts as clay stabilization agents

The invention provides a surfactant mixture, comprising a zwitterionic surfactant, a nonionic surfactant and a cationic surfactant, which forms a foamable liquid composition upon addition to aqueous media including fresh water, brines, acids and water/alcohol mixtures. The foams prepared from the foamable liquid composition have utility as fracturing fluids and well cleaning fluids.

Multipurpose aqueous foamer

A method for viscosifying a liquid hydrocarbon-based fracturing fluid is disclosed. The method comprises mixing together a liquid hydrocarbon, an acid, a phosphate composition and an aluminate activator. The phosphate composition comprises an organic phosphate ester selected from the group consisting of orthophosphate esters of the formulae ##STR1## wherein R is an alkyl group containing one to about eight carbon atoms and R' is selected fromt the group consisting of alkyl groups containing about six to about eighteen carbon atoms, alkenyl groups containing about six to about eighteen carbon atoms and mixtures thereof. Hydrocarbon-based fracturing fluids prepared by such method, and methods of use of such fluids are also disclosed.

Method for preparation of hydrocarbon fracturing fluids, fluids prepared

This invention relates to the use of silicone-induced hydrocarbon foams as well stimulants, for example as illustrated by their use in fracturing well formations, removal of paraffin in wells, removal of condensate hydrocarbons from blocked gas wells, etc.

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St. Louis, MO, United States of America

Gary A Scherubel