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.
Claims13
A method of improving the suspension characteristics 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 with at least two carboxylic moieties;
- and (b) a polyamine unit having an amine functionality of two or more, wherein the oil-based drilling fluid exhibits a rheological profile corresponding to a change in Fann reading no more than 50-70 units as shear rate is varied from 600 rpm to 6 rpm at a temperature of 120° F.
Dependencies are inferred from the claim text.