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US 11,377,586 B2Granted
Use of a borate-acid buffer in oil and gas operations
AssigneeChevron U.S.A. Inc.
InventorsNabijan Nizamidin, Gayani W. Pinnawala, Guo-Qing Tang, Varadarajan Dwarakanath, Gregory A. Winslow, Jordan Taylor Isbell, Taimur Malik
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Abstract
Provided herein are compositions comprising borate-acid buffers, as well as methods of using these compositions in oil and gas operations, including enhanced oil recovery (EOR) operations, fracturing operations, stimulation operations, etc.
Claims23
A method for improving hydrocarbon recovery from a subterranean formation containing hydrocarbons therewithin, the method comprising:
- injecting an aqueous composition comprising (i) a borate-acid buffer, (ii) a surfactant package;
- (iii) water;
- and (iv) optionally a water-soluble polymer into the subterranean formation through a wellbore in fluid communication with the subterranean formation;
- wherein the borate-acid buffer exhibits a capacity to buffer at a pH of from 6.0 to 8.5;
- wherein the borate-acid buffer is present in an effective amount to chelate divalent metal ions present in the water or in water present in the subterranean formation.
2 more elements
Dependencies are inferred from the claim text.