Patent ID: 6462096
Filing Date: 2002-10-08
Classification: C01B,C09K,Y10S

Abstract:
An organophilic clay additive for oil based drilling fluids providing such fluids with improved temperature stable rheological properties comprising the reaction product of:a) hectorite clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of clay, 100% active clay basis; and d) a first organic cation provided by an alkoxylated quaternary ammonium salt; and e) a second organic cation wherein such second organic cation is not provided by an alkoxylated quaternary ammonium salt; wherein the second organic cation is present in an amount of from 25% to about 75% by weight of the total organic cation content, and the total amount of organic cations b) and c) is about equal to the cation exchange capacity of the hectorite clay.