Sulfonated asphalt/causticized lignite blend
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United States of America Patent
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-
Feb 24, 1987
Grant Date -
N/A
app pub date -
May 23, 1985
filing date -
May 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A well-working fluid such as a drilling mud containing a mixture of sulfonated asphalt and a causticized lignite. The use of the mixture gives a less expensive composition than would be the case with pure sulfonated asphalt and at the same time results in a higher quality fluid in that foaming is reduced and on balance the rheological properties are improved. The invention is of particular applicability in drilling muds using conventional ingredients such as clays and polymeric thickening agents such as CMC.
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