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US 8,408,301 B2Granted
Shear tolerant aqueous based fracturing fluids and methods
AssigneeHalliburton Energy Services, Inc.
InventorsPaul D. Lord, Ivan Suleiman, John M. Terracina, Rajendra A. Kalgaonkar
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Abstract
A method comprises providing a treatment fluid comprising a gelling agent, an aqueous base fluid, a buffer composition comprising a plurality of salts, and a crosslinking agent; and contacting a subterranean formation with the treatment fluid. The aqueous base fluid is preferably seawater and the buffer composition includes one or more salts present in the treatment fluid from about 1 to about 1000 pounds per gallon of treatment fluid.
Claims18
A method comprising:
- providing a treatment fluid comprising:
- a gelling agent,
- seawater,
- a buffer composition comprising a plurality of salts selected from the group consisting of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and combinations thereof, and
- a crosslinking agent
- wherein the shear recovery of the treatment fluid is at least 100% greater than the shear recovery of a fluid lacking the buffer composition after a shear event of at least 450s−1;
- and
- contacting a subterranean formation with the treatment fluid wherein the subterranean formation has a temperature greater than about 200° F.
5 more elements
A method comprising:
- providing a treatment fluid comprising a gelling agent, seawater, a buffer composition, and a crosslinking agent,
- wherein the shear recovery of the treatment fluid is at least 100% greater than the shear recovery of a fluid lacking the buffer composition after a shear event of at least 450s−1, and
- wherein the buffer composition comprises a plurality of salts selected from the group consisting of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and combinations thereof;
- wherein the treatment fluid has a pH of less than 9.5;
- introducing the treatment fluid into a subterranean formation at a rate and pressure whereby a fracture is formed in the subterranean formation, wherein the subterranean formation has a temperature greater than about 200° F.;
- allowing the treatment fluid to break;
- and
- recovering at least a portion of the treatment fluid.
5 more elements
A composition comprising:
- a gelling agent;
- seawater;
- a buffer composition comprising sodium bicarbonate and potassium bicarbonate;
- and
- a crosslinking agent;
- wherein the shear recovery of the composition is at least 100% greater than the shear recovery of a fluid lacking the buffer composition after a shear event of at least 450s−1.
3 more elements
Dependencies are inferred from the claim text.