Cement compositions with improved fluid loss characteristics and methods of cementing using such cement compositions
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United States of America Patent
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May 15, 2007
Grant Date -
Dec 22, 2005
app pub date -
Jun 21, 2004
filing date -
Jun 21, 2004
priority date (Note) -
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Abstract
The present invention provides a method of cementing in a subterranean formation that includes providing a cement composition that includes water, cement, and a fluid loss control additive that includes a water-soluble hydrophobically modified polymer or a hydrophilically modified water-soluble polymer; placing the cement composition into the subterranean formation; and allowing the cement composition to set therein. In certain embodiments, the water-soluble hydrophobically modified polymer or the hydrophilically modified water-soluble polymer may include a polymer backbone that comprises polar heteroatoms. In another embodiment, the water-soluble hydrophobically modified polymer may be a reaction product of a hydrophobic compound with a polyvinylamine, a poly(vinylamine/vinyl alcohol), or an alkyl acrylate polymer.
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