Method of removing an invert emulsion filter cake after the drilling process using a single phase microemulsion
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United States of America Patent
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Mar 30, 2010
Grant Date -
Feb 1, 2007
app pub date -
Oct 2, 2006
filing date -
Sep 3, 2004
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Abstract
Single phase microemulsions improve the removal of filter cakes formed during drilling with invert emulsions. The single phase microemulsion removes oil and solids from the deposited filter cake. Optionally, an acid capable of solubilizing the filter cake bridging particles may also be used with the microemulsion. In one non-limiting embodiment the acid may be a polyamino carboxylic acid. Skin damage removal from internal and external filter cake deposition can be reduced.
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