High temperature retarders for oil field cements, cement slurries and corresponding cementing processes
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United States of America Patent
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Apr 2, 1996
Grant Date -
N/A
app pub date -
Mar 8, 1994
filing date -
Mar 10, 1993
priority date (Note) -
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Abstract
The invention relates to the cementing of high temperature wells. The retarder consists of a methylene phosphonic acid derivative and of a boric acid or a borate at least as acid as borax in an aqueous solution, in particular, Na pentaborate, in a preferred ratio of 0.08 to 0.92 parts by weight. A long setting time and a very swift compressive strength development are obtained at the same time.
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