Mineral-based drilling fluid and drilling method
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United States of America Patent
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Oct 22, 2013
Grant Date -
Dec 30, 2010
app pub date -
Dec 4, 2008
filing date -
Dec 10, 2007
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Abstract
A high-temperature drilling fluid is disclosed based on brine and on a mixture of solids of controlled grain size, with water, dissolved salts and insoluble mineral solids comprising at least in part a weighting material of a grain size such that its D50 ranges between 1 and 25 μm and in part colloids of a grain size such that its D50 ranges between 0.2 and 2 μm. The total volume fraction of the solids ranges between 30 and 50% in relation to the total volume, and the total volume comprises at least 10% by volume of the colloids.
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