High temperature drilling mud composition
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United States of America Patent
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Oct 18, 1988
Grant Date -
N/A
app pub date -
Sep 11, 1986
filing date -
Sep 11, 1986
priority date (Note) -
Expired
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Abstract
A composition, including a mixture of high-yield bentonite and low-yield bentonite, in a ratio of high-yield bentonite to low-yield bentonite in the range of about 10:1 to about 1:1, and preferably in the range of 5:1 to 3:1, together with a water-in-soluble form of leonardite, that is particularly useful in a water-based drilling mud and exhibits unexpected stability and rheological functionality at the high temperatures and high pressures encountered in deep wells.
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