Drilling fluids and thinners therefor
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United States of America Patent
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Oct 21, 1986
Grant Date -
N/A
app pub date -
Jul 30, 1984
filing date -
Jul 30, 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 sulfoalkylated tannin or heavy metal complex thereof, optionally in combination with a lignite, and a second agent comprising a metal compound containing tin, optionally in combination with a metal compound containing nickel or manganese, and wherein said metals can be present in the cation and/or anion portion of said metal compound.
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