Drilling fluid additive and process therewith
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United States of America Patent
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Sep 26, 2000
Grant Date -
N/A
app pub date -
Oct 7, 1998
filing date -
Oct 7, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composition is provided which comprises a polymer comprising repeat units derived from an unsaturated amide, an N-vinyl lactam, and optionally, a vinyl acid. Also provided is a water-based fluid composition which can be used as drilling fluid wherein the composition comprises calcium chloride and the polymer. Further providing is a process for using a water-based fluid wherein the process comprises contacting a subterranean formation with the water-based fluid composition disclosed above to effect the control of fluid loss of the water-based fluid composition.
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