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.
Claims18
-49. (canceled)
A method of using an oil-based drilling fluid having one or more acceptable 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 with at least two carboxylic moieties;
- and (b) a polyamine unit having an amine functionality of two or more, wherein the one or more acceptable environmental properties are based on a PARCOM 1995 protocol.
Dependencies are inferred from the claim text.