Method for controlling the set time of cement
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United States of America Patent
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Mar 25, 1997
Grant Date -
N/A
app pub date -
Jun 2, 1995
filing date -
Jun 2, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An oil and gas well cementing composition and method are shown utilizing hydraulic cement, water a cement hydration retarder and an additive which is effective over a selected time period to degrade the retarder. The additive is a controlled release oxidizer which releases nascent oxygen over time to gradually oxidize the cement hydration retarder, thereby providing a single cement slurry design for cementing pipes for oil and gas wells where wide temperature differentials exist between the two ends of the pipe.
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