Solid polyamine-based fluid loss control additives
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United States of America Patent
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Nov 13, 1984
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N/A
app pub date -
Jun 21, 1982
filing date -
Jun 21, 1982
priority date (Note) -
Expired
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Abstract
A free-flowing solid particulate composition containing a polyamine dispersed on a finely divided, high surface-area silica or silicate adapted to be mixed with dry hydraulic cement to reduce fluid loss during well cementing. Preferably, polyethylenepolyamine or polyethylenimine is dispersed on a high surface-area silica. Improved well cementing in porous media is achieved by mixing the composition with dry hydraulic cement, adding water to the mixture to create a slurry, and pumping the slurry down the well casing into contact with the porous media. The composition acts as a fluid loss control agent at temperatures below 100.degree. F. without sulfonated polymers.
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