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US 4,392,964 AGranted
Compositions and method for thickening aqueous brines
AssigneeNL Industries, Inc.
InventorsRoy F. House, Lonnie D. Hoover
Life of this patent
Estimating the term…
Abstract
A polymeric composition useful in the thickening of aqueous brines comprising hydroxyethyl cellulose, a water miscible organic liquid and an aqueous liquid.
Claims12
A well servicing fluid comprising:
- an aqueous brine having a density of at least 11.7 ppg;
- and
- a polymeric composition comprising from about 5 to about 30% by weight of hydroxyethyl cellulose, at least about 40% by weight of isopropanol, and from about 3 to about 40% by weight of an aqueous liquid, wherein said isopropanol, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic liquid of 1:2, produces a mixture with free liquid present after remaining quiescent for one week at ambient temperature in a sealed container.
A method of preparing a well servicing fluid comprising:
- forming a generally uniform polymeric composition by admixing from about 5 to about 30% by weight of hydroxyethyl cellulose, at least about 40% by weight of isopropanol, and from about 3 to about 40% by weight of an aqueous liquid, wherein said isopropanol, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic liquid of 1:2, produces a mixture with free liquid present after remaining quiescent for one week at ambient temperature in a sealed container;
- and
- admixing said polymeric composition with an aqueous brine having a density of at least 11.7 ppg.
Dependencies are inferred from the claim text.