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US 5,030,366 AGranted
Spacer fluids
AssigneeAtlantic Richfield Company
InventorsWilliam N. Wilson, Roger D. Bradshaw, Bonsall S. Wilton, Robert B. Carpenter
Life of this patent
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Abstract
Spacer fluids providing an effective buffer between drilling fluids and cement slurries during well completion. The spacer fluids comprise a sulfonated styrene copolymer dispersant and one or more additional components such as surfactants, viscosifiers and weighting materials to form a rheologically compatible fluid between the drilling fluid and the cement slurry.
Claims11
A spacer composition comprising:
- (a) sulfonated styrene-maleic anhydride copolymer,
- (b) an ethoxylated nonylphenol surfactant, and
- (c) water.
A spacer composition comprising:
- (a) sulfonated styrene-maleic anhydride copolymer,
- (b) a weighting material comprising Portland cement, and
- (c) one or more viscosifiers selected from the group consisting of welan gum, hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, attapulgite, partially hydrolyzed polyacrylamide, sepiolite, bentonite, acrylamide polymers, acrylic acid polymers 2-acrylamido-2-methylpropane sulfonic acid copolymers, polyvinylpyrrolidone, silicate extenders, and drilling fluid.
A spacer composition comprising:
- (a) sulfonated styrene-maleic anhydride copolymer,
- (b) one or both of an anionic and nonionic water wetting surfactant,
- (c) one or more viscosifiers selected from the group consisting of hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, partially hydrolyzed polyacrylamide, bentonite, attapulgite, sepiolite and sodium silicate, and
- (d) one or more weighting materials selected from the group consisting of barite, hematite, illmenite and sand.
1 more element
A spacer composition comprising:
- (a) sulfonated styrene-maleic anhydride copolymer,
- (b) bentonite,
- (c) welan gum,
- (d) an ethoxylated nonylphenol surfactant, and
- (e) a weighting agent.
2 more elements
Dependencies are inferred from the claim text.