Spacer fluids
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United States of America Patent
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Jul 9, 1991
Grant Date -
N/A
app pub date -
Nov 27, 1989
filing date -
Nov 27, 1989
priority date (Note) -
Expired
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Abstract
Spacer fluids providing an effective buffer between drilling fluids and cement slurries during well completion. The spacer fluids comprise a sulfonated styrene copolymer dispersant and one or more additional components such as surfactants, viscosifiers and weighting materials to form a rheologically compatible fluid between the drilling fluid and the cement slurry.
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