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Methods, well cement compositions and lightweight additives therefor

  • US 6,648,961 B2
  • Filed: 11/20/2002
  • Issued: 11/18/2003
  • Est. Priority Date: 12/03/2001
  • Status: Expired due to Term
First Claim
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1. A cement composition comprising:

  • a hydraulic cement;

    water; and

    an additive comprised of a suspension of fly ash microspheres in water gelled with sodium bentonite.

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