Lightened cement grout suitable for the cementation of hydrocarbon production wells
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United States of America Patent
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May 4, 1993
Grant Date -
N/A
app pub date -
Oct 11, 1991
filing date -
Feb 14, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a lightened gas-impermeable cement grout which comprises hydraulic cement, water, silica fumes in an amount of from about 5 to about 65 weight % based on the weight of the cement, and at least one polyethylene imine having a molecular weight of between about 600,000 and about 1,000,000 in an amount of from about 1 to about 25% weight % based on the weight of the water.
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