×

Low density cement slurry and its use

  • US 4,305,758 A
  • Filed: 09/04/1980
  • Issued: 12/15/1981
  • Est. Priority Date: 06/11/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. A hydraulic cement slurry which comprises as its essential components:

  • hydraulic cement, about 8 to about 50 weight percent hollow glass microspheres by weight of the cement and sufficient water to form a pumpable slurry, wherein the API free water content of said slurry is no more than about 2 volume percent based only on said hydraulic cement and said microspheres, and said microspheres have ANSI/ASTM D 2840-69 average true particle densities of about 0.2 to about 0.5 gm/cm3, ANSI/ASTM D 3102-72 hydrostatic collapse strengths of at least 500 psi (3447 kPa) and average particle diameters of less than about 500 microns.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×