Oil well bore hole filter cake breaker fluid test apparatus and method
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United States of America Patent
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Apr 8, 2003
Grant Date -
Feb 13, 2003
app pub date -
May 18, 2001
filing date -
May 18, 2001
priority date (Note) -
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Abstract
A method and apparatus for determining the effectiveness and reaction time of a breaker fluid in breaking a filter cake on the wall of a wellbore penetrating a subterranean formation is disclosed. The method comprises employing an apparatus, such as for example the apparatus of the invention with a filter medium and the capability of applying differential pressure or dynamic conditions to form a filter cake on the filter medium with drilling mud. Breaker fluid is then substituted for the drilling mud, preferably without damage to the filter cake. The quantity of breaker fluid passing across the filter medium under static conditions is monitored over time. An increase in the rate of fluid passing across or through the medium indicates break-up of the filter cake.
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