Equivalent circulating density control in deep water drilling
AssigneeElementis Specialties, Inc.
InventorDavid Dino
Life of this patent
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Abstract
A method of providing a substantially constant rheological profile of a drilling fluid over a temperature range of about 120° F. to about 40° F. includes adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive includes the reaction product of a carboxylic acid with at least two carboxylic moieties; and a polyamine having an amine functionality of two or more. A composition, such as an oil based drilling fluid, includes the reaction product of a carboxylic acid with at least two carboxylic moieties and a polyamine having an amine functionality of two or more.
Claims6
A method of providing an oil-based drilling fluid having one or more environmental properties of an oil-based drilling fluid comprising adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive consists essentially of a polyamide having repeat units of (a) a carboxylic unit derived from a dimer fatty acid selected from the group consisting of a C16 dimer fatty acid, a C18 dimer fatty acid and mixtures thereof;
- and (b) polyamine unit is derived from diethylenetriamine, wherein the one or more environmental properties are based on a PARCOM 1995 protocol of a LC50 (10 days) value greater than 5000 mg/kg for corophium volutator.
Dependencies are inferred from the claim text.