Lubricating composition including an ester-use of the composition and well fluid including the composition
AssigneeInstitut Francais du Petrole
InventorsJean-Fran.cedilla.ois Argillier, Annie Audibert, Pierre Marchand, Andr e Demoulin, Michel Janssen
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Abstract
The present invention relates to an optimized lubricating composition including, in useful amount, an ester and a fatty acid, and optionally, the invention also relates to a well fluid including the lubricating composition according to the invention and the use of the composition for controlling the lubricity of a water-base fluid.
Claims22
A lubricating composition for water-base well fluids, comprising:
- from 50% to 99% by weight of a part A consisting of one or several esters obtained by reaction of a monocarboxylic acid (A.1), linear or branched, having 8 to 24 carbon atoms, and of a polyol (A.2), linear or branched, having 2 to 20 carbon atoms, wherein the acid:alcohol molar ratio (A.1:A.2) is between 1:1 and n-n/10:
- 1, where n represents the number of hydroxyl groups of the alcohol A.2,
- from 1% to 50% by weight of a part B consisting of monocarboxylic acids, linear or branched, having 8 to 24 carbon atoms,
- and wherein the monocarboxylic acids in B are a mixture of at least 80% carboxylic acids having 1 to 3 unsaturations.
A method of enhancing the lubricity of an ester obtained by reaction of a monocarboxylic acid (A.1), linear or branched, having 8 to 24 carbon atoms, and of a polyol (A.2), linear or branched, having 2 to 20 carbon atoms, comprising adding to 50% to 99% by weight of said ester 1% to 50% by weight of (B) at least one linear or branched monocarboxylic acid having 8-24 carbon atoms, wherein the carboxylic acids (B) are a mixture of at least 80% carboxylic acids having 1-3 unsaturations.
A lubricating composition for water-base well fluids, consisting of:
- from 50% to 99% by weight of a part A consisting of one or several esters obtained by reaction of a monocarboxylic acid (A.1), linear or branched, having 8 to 24 carbon atoms, and of a polyol (A.2), linear or branched, having 2 to 20 carbon atoms, wherein the acid:alcohol molar ratio (A.1:A.2) is between 1:1 and n-n/10:1, where n represents the number of hydroxyl groups of the alcohol A.2,
- from 1% to 50% by weight of a part B consisting of monocarboxylic acids, linear or branched, having 8 to 24 carbon atoms,
- and wherein the monocarboxylic acids in B are a mixture of at least 80% carboxylic acids having 1 to 3 unsaturations.
Dependencies are inferred from the claim text.