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

Claim 12:
13. A method of reducing fluid loss from a well or into a subterranean formation penetrated by a well, the method comprising:
(a) emplacing into the well a fluid loss pill comprising a brine and a partially crosslinked polymer comprising the product of an (i) underivatized guar or a derivatized guar and (ii) a crosslinking agent comprising puffed boron particles, wherein the partially crosslinked polymer exhibits lipping and further wherein the partially crosslinked polymer contains from about 0.1 to about 2.5 volume percent of the crosslinking agent; the remainder being the underivatized guar or derivatized guar; and
(b) further crosslinking the underivatized guar or derivatized guar with the puffed boron particles once the fluid loss pill is emplaced into the well and increasing the viscosity of the fluid loss pill at a targeted location within the well;
wherein the puffed boron particles have 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.