Drilling fluid, apparatus, and method

Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component

Reexamination Certificate

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Details

C507S110000, C507S112000, C507S113000

Reexamination Certificate

active

07018955

ABSTRACT:
Disclosed are drilling fluids that include carboxyalkylated corn hulls in an amount effective to inhibit fluid loss from a wellbore formation. The carboxyalkylated corn hulls are heat stable and surprisingly effective at inhibiting fluid loss. Also disclosed are a drilling apparatus and a drilling process.

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