Drilling fluid
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 3, 1987
Grant Date -
N/A
app pub date -
Oct 11, 1984
filing date -
Oct 11, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an aqueous drilling fluid, an improved thinning effect is obtained by adding a first agent comprising a mixture of a sulfoalkylated tannin or polyvalent metal complex thereof with a lignite, optionally in combination with a second agent comprising a metal compound of chromium, titanium, iron, zinc, strontium or magnesium which is at least partially soluble in water.
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