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US 5,292,367 AGranted
Dispersant compositions for subterranean well drilling and completion
AssigneeAtlantic Richfield Company
InventorsJames B. Bloys, William N. Wilson, Edward Malachosky, Robert B. Carpenter, Roger D. Bradshaw
Life of this patent
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Abstract
A dispersant for spacer fluids, cement slurries, completion fluids and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.
Claims20
A slurry for use in drilling and completion of subterranean wells, comprising:
- a cement slurry;
- and
- from 0.1 to 20.0 pounds per 42.0 gallons of said cement slurry of a polymeric dispersant selected from the group consisting of a hydroxypropyl acrylate-acrylic acid copolymer;
- sulfonated vinyl toluene-maleic anhydride copolymer;
- sulfonated vinyl toluene-maleic acid copolymer;
- sulfonated methyl polyacrylamide;
- sulfonated ethyl polyacrylamide;
- sulfonated phenyl polyacrylamide;
- and copolymers of ethylenic acids, acrylamides and ethylenic esters of phosphoric acid.
6 more elements
A mixture, comprising:
- a drilling fluid;
- a cement slurry;
- and
- from 0.1 to 20.0 pounds per 42.0 gallons of said mixture of a polymeric dispersant selected from the group consisting of hydroxypropyl acrylate-acrylic acid copolymer;
- sulfonated vinyl toluene-maleic anhydride copolymer;
- sulfonated vinyl toluene-maleic acid copolymer;
- sulfonated methyl polyacrylamide;
- sulfonated ethyl polyacrylamide;
- sulfonated phenyl polyacrylamide;
- and copolymers of ethylenic acids, acrylamides and ethylenic esters of phosphoric acid.
7 more elements
Dependencies are inferred from the claim text.