Methods for reducing circulation loss during drilling operations
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United States of America Patent
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Mar 24, 2009
Grant Date -
Feb 15, 2007
app pub date -
Oct 4, 2006
filing date -
Apr 6, 2004
priority date (Note) -
Expired
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Abstract
A method for reducing circulation loss during drilling operations, the method comprising: performing drilling operations using a water-based drilling fluid system comprising a first amount of water insoluble particulate; providing the drilling fluid system with a second amount of alkali metal silicate, the first amount of water insoluble particulate and the second amount of alkali metal silicate comprising a circulation loss combination; and reducing the pH of the water-based drilling fluid system using a quantity of water soluble activating agent effective to form an effective circulation loss structure after a period of time.
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