Water based completion and displacement fluid and method of use
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United States of America Patent
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Jan 31, 2012
Grant Date -
Oct 5, 2006
app pub date -
Jan 20, 2006
filing date -
Apr 5, 2005
priority date (Note) -
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Abstract
A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid includes an aqueous fluid, a water soluble polar organic solvent, a hydrolysable ester of a carboxylic acid, and a weighting age, and where the hydrolysable ester is selected so that upon hydrolysis an organic acid is released and the invert emulsion of the filter cake breaks.
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