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US 10,870,795 B2Granted
Rheology modifier
AssigneeHalliburton Energy Services, Inc.
InventorsJanette Cortez, Dipti Singh, Ubong Inyang
Life of this patent
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Abstract
The composition provided herein includes an aqueous base fluid, a water-based polymer and glass microspheres comprising a metal cross-linking agent and where the water-based polymer cross-links in the presence of the glass microspheres.
Claims20
A composition comprising:
- an aqueous base fluid;
- a water-based polymer present in an amount from about 5 lb to about 100 lbs per 1000 gallons of the aqueous base fluid;
- salt present in the amount of about 1% (w/v) to about 20% (w/v) of the total volume of the aqueous base fluid;
- and
- glass microspheres comprising a metal cross-linking agent, wherein the glass microspheres are between about 5 to about 500 microns, the metal cross-linking agent comprises from about 8% to about 25% of the glass microsphere's chemical composition, and the glass microspheres are present in the amount of from about 0.5% (w/v) to about 15% (w/v) based on the total volume of the aqueous base fluid;
- and
- wherein the water-based polymer cross-links in the presence of the glass microspheres and the presence of salt increases the viscosity of the composition by at least 50 cP over the viscosity of the composition in the absence of salt.
4 more elements
A method comprising the steps of:
- (a) providing a composition comprising an aqueous base fluid, glass microspheres comprising a metal cross-linking agent, and a water-based polymer, wherein the water-based polymer is present in an amount of from about 5 lb to about 100 lbs per 1000 gallons of the aqueous base fluid, wherein the glass microspheres are between 5 to about 500 microns and the metal cross-linking agent comprises from about 8% to about 25% of the glass microsphere's chemical composition;
- and
- (b) creating a gelled fluid by cross-linking the water-based polymer in the presence of from about 0.5% (w/v) to about 15% (w/v) of the glass microspheres based on the total volume of the aqueous base fluid, and in the presence of about 1% (w/v) to about 20% (w/v of a salt based on the total volume of the aqueous base fluid, such that metal ions present in the glass microspheres act as a cross-linking agent and the presence of salt increases the viscosity of the composition by at least 50 cP over the viscosity of the composition in the absence of salt.
Dependencies are inferred from the claim text.