Drilling fluid systems for reducing circulation losses
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United States of America Patent
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Jun 5, 2007
Grant Date -
Oct 6, 2005
app pub date -
Apr 6, 2004
filing date -
Apr 6, 2004
priority date (Note) -
Expired
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Abstract
A circulation loss combination for water-based drilling fluid system(s) comprising: a first amount of alkali metal silicate; a second amount of water insoluble particulate; and, a quantity of water soluble activating agent effective to reduce the pH of the water-based drilling fluid system to a value sufficiently low to form an effective circulation loss structure at a desired period of time after addition to the water-based drilling fluid system.
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