Equivalent circulating density control in deep water drilling
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United States of America Patent
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Aug 19, 2014
Grant Date -
Jun 7, 2012
app pub date -
Feb 13, 2012
filing date -
Mar 7, 2008
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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.
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