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US 4,728,445 AGranted
Well drilling fluids and process for drilling wells
AssigneePony Industries, Inc.
InventorArthur H. Hale
Life of this patent
Estimating the term…
Abstract
The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amount of sulfonated styrene-itaconic acid copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylamide or their derivatives.
Claims6
A composition comprised of
- (a) an aquous base,
- (b) a clayey material suspended in said aqueous base,
- (c) a water-soluble sulfonated styrene-itaconic acid copolymer having a pre-sulfonation molecular weight of about 500 to about 10,000,
- (d) a water-soluble polymer having a molecular weight of about 500 to about 30,000 prepared from acrylic acid, acrylamide, methacrylic acid, alkali metal salts of acrylic acid, alkali metal salts of methacrylic acid, alkyl esters of acrylic acid, alkyl esters of methacrylic acid, acrylamido alkyl sulfonate and mixtures of these,
- the combined total weight of the polymers of (c) and (d) present in the composition being in the range of about 0.05 to about 10.0 pounds per barrel of composition and the weight ratio of the polymer of (c) to the polymer of (d) being in the range of about 90:10 to about 5:95.
2 more elements
Dependencies are inferred from the claim text.