Patent ID: 11859126
Assignee: ALLEMAN CONSULTING, LLC
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 17:
18. A method for reducing fluid loss into a subterranean formation penetrated by a well:
A. pumping into a well a fluid loss pill comprising:
(i) a crosslinked polymer of underivatized guar or derivatized guar and a crosslinking agent comprising puffed boron particles having a density from about 0.05 to about 0.40 g/cc, a bulk density from about 150 to about 350 g/l and a diameter from about 420 to about 1,000 μm;
(ii) glycerol;
(iii) a copolymer of either a sodium salt of sulfonated acrylamide and a vinyl lactam or polyacrylamide and a sodium salt of a sulfonated acrylamide; and
(iv) a brine;

B. increasing the viscosity of the fluid loss pill at a targeted location within the well;
C. forming a plug at a surface of the subterranean formation; and
D. reducing fluid flow into the subterranean formation with the formed plug.