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US 7,205,262 B2Granted
Friction reducing composition and method
AssigneeWeatherford/Lamb, Inc.
InventorsKevin N Schwartz, Kevin W. Smith
Life of this patent
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Abstract
Water soluble nonionic friction reducers and added to coacervate gels having excellent shear viscosities and other properties. A preferred gel comprises poly diallyl dimethyl ammonium chloride, a lesser amount of sodium lauryl sulfonate, and lauryl alcohol. Excellent friction reducing properties are manifested; a particularly practical use for the compositions is in subterranean formation fracturing.
Claims31
An aqueous composition useful for conserving energy in the transportation of aqueous fluids through pipes, comprising:
- water and, by weight based on the water, a gel, comprising:
- (a) 0.1% to 5% of an anionic or cationic polymer,
- (b) a lesser amount but at least 0.01 % of a surfactant having from 8 to 22 carbon atoms and a charge opposite that of said polymer,
- (c) from 0.001 to 5% of a hydrophobic alcohol,
- (d) up to 5% of an amphoteric surfactant, and
- (e) up to 5% of an amine oxide, said gel having a Zeta Potential of an absolute value of at least 20 millivolts, and at least 0.0001% water soluble nonionic friction reducer.
3 more elements
Composition useful for friction reduction in aqueous systems, comprising:
- a coacervate gel, comprising:
- a cationic or anionic polymer;
- a lesser amount of an oppositely charged surfactant, in a ratio to provide a Zeta Potential of an absolute value of at least 20 millivolts, and
- from 0.001% to 5% by weight of a hydrophobic alcohol having 6 to 23 carbon atoms, and
- a nonionic water soluble friction reducer, the nonionic water soluble friction reducer being present in a weight ratio to the anionic or cationic polymer of 0.001:1 to 5:1.
2 more elements
Dependencies are inferred from the claim text.