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US 12,637,610 B2Granted
Low concentration synthetic polymer fracturing fluid with ascorbic acid
AssigneesCNPC USA Corporation, Beijing Huamei, Inc., China National Petroleum Corporation
InventorsLulu Song, Stephanie Yu
Life of this patent
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Abstract
A fracturing fluid for fracturing subterranean formations comprising ascorbic acid. The fracturing fluid can use ascorbic acid to delay increases in viscosity until desired. The viscosity increase can then be maintained over a period of time to perform fracturing operations.
Claims20
A fracturing fluid system, comprising:
- a proppant;
- water;
- a gelling agent, wherein the gelling agent is present in a concentration of from 5 to 7 gallons per thousand (gpt);
- a stabilizer comprising ascorbic acid, wherein the ascorbic acid ranges from about 0.5 to 2 parts per thousand (ppt);
- a cross-linking agent;
- and
- a pH adjuster, wherein the pH adjuster adjusts a pH of the fracturing fluid system with the pH adjuster to about 5.5 to 6.5;
- wherein the fracturing fluid system is capable of maintaining a viscosity above about 100 centipoise (cP) for at least 90 minutes.
5 more elements
Dependencies are inferred from the claim text.