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US 5,209,859 AGranted
Inhibited acid system for acidizing wells
AssigneeExxon Chemical Patents Inc.
InventorsDennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall
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Abstract
An acid system for acidizing wells contains corrosion inhibitor additives which consist essentially of a metal selected from antimony and antimony mixtures, a quaternary compound, and a surfactant. The corrosion inhibitor is free of toxic acetylenic compounds.
Claims6
A liquid system for use in the treatment of a subterranean formation comprising
- (a) an aqueous acid solution;
- and
- (b) a nonacetylenic corrosion inhibitor comprising
- (i) a complex formed by reacting from 0.04 to 2.0 wt % of an antimony compound with from 0.2 to 10 wt % of a quaternary ammonium compound, said complex being dispersed in the aqueous acid solution;
- and
- (ii) from 0.1 to 25 wt % of a surfactant dissolved in the aqueous solution, said surfactant being capable of water wetting metal, said wt % being based on the weight of the aqueous acid solution.
3 more elements
Dependencies are inferred from the claim text.