Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate
2002-11-27
2008-03-18
Peng, Kuo-Liang (Department: 1712)
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
C507S133000, C507S244000, C507S246000
Reexamination Certificate
active
07345010
ABSTRACT:
The invention is of oil-based drilling fluids including invert emulsion fluids that are able to maintain a relatively consistent rheological profile over a wide temperature range. The invention also includes new additives that enable the preparation of drilling fluids with viscosities that are less affected by temperature over a temperature range from less than about 40° F. to more than about 250° F. compared to conventional fluids. These additives are based on reaction products of polyamines and carboxylic acids with two or more carboxylic moieties combined with alkoxylated amines and fatty acid amides. In addition, this invention permits the use of reduced amounts of organoclay rheological additives in drilling fluids.
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J. W. Jordan, “Proceedings of the 10th National Conference on Clays and Minerals” Pergamon Press, Austin (1963) pp. 299-308.
Dino David
Jobbins Richard
Matyi, Jr. Mark
Thompson Jeffrey
Elementis Specialties, Inc.
Morgan & Lewis & Bockius, LLP
Peng Kuo-Liang
LandOfFree
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