Method of decreasing the disintegration of shale-containing cuttings and drilling fluid therefor
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United States of America Patent
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Oct 28, 2008
Grant Date -
Mar 16, 2006
app pub date -
Oct 31, 2005
filing date -
Apr 11, 2003
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Abstract
The invention provides a method of enhancing the recovery of shale-containing cuttings during the drilling of a borehole in a shale-containing subterranean formation which comprises adding to the drilling fluid circulating in the borehole a finely ground, very sparingly soluble, anhydrous, alkali metal silicate glassy material to provide the drilling fluid with a concentration of soluble silica in the range from about 0.1% to about 1.0% by weight of the aqueous phase of the drilling fluid. Preferably the drilling fluid has a pH in the range from about 8.0 to about 11.0, most preferably about 8.5 to less than 11.0. The preferred alkali metal is potassium.
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