Foamed drilling fluids, their process for preparation and the corresponding drilling method
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United States of America Patent
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Oct 13, 1998
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N/A
app pub date -
Jun 7, 1996
filing date -
Aug 4, 1994
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Abstract
The present invention is directed to an aqueous foamed Drilling Fluid for drilling well bores into a subterranean formation, comprising water, at least one clay and at least one foaming agent. According to the invention, it further comprises at least one metal hydroxide. The invention further relates to a method for preparing said foamed drilling fluid.
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