Zwiterionic 2-alkyl imidazolines as emulsifying agents for oil based drilling fluids
AssigneeDresser Industries, Inc.
InventorArvind D. Patel
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Abstract
Improved emulsifying agents for oil based drilling fluids, compared to imidazoline materials presently being used in oil based drilling fluids, that not only are excellent emulsifiers for oil based drilling fluids, but also are effective wetting agents and fluid loss control agents in invert (water-in-oil) systems, are obtained from imidazolines prepared by reacting long chain fatty acids with polyalkylene polyamines to form a 2-alkyl imidazoline, and then reacting the 2-alkyl imidazoline with an activated dicarboxylic acid to form the desired 2-alkyl imidazoline derivative.
Claims7
Zwiterionic 2-alkyl imidazoline selected from the group consisting of ##STR3## 1-(2'-aminoethane)-2-alkyl-3-succinyl imidazole salt, and ##STR4## 1-2'-akylamido ethane)-2-alkyl-3-succinyl imadzole salt;
- wherein R is an alkyl radical containing 12 to 22 carbon atoms.
An activated unsaturated dicarboxylic acid derivative of a 2-alkyl imidazoline prepared by first adding a long chain fatty acid containing 12 to 22 carbon atoms to a polyalkylene polyamine of the formula NH.sub.2 (CH.sub.2 CH.sub.2 NH).sub.n CH.sub.2 CH.sub.2 NH.sub.2 wherein n is a number from 1 to 12, to form the 2-alkyl imidazoline, and reacting with said imidazoline reaction product an unsaturated dicarboxylic acid containing at least one activated carbon-to-carbon double bond in an alpha,beta position in the molecule with respect to a carboxylic acid group, --C.vertline.C--COOH, said dicarboxylic acid containing 4 to 8 carbon atom, the carboxyl groups being in a cis relation to each other.
Dependencies are inferred from the claim text.