Low density cement slurry and its use

Details Low density cement slurry and its use Low density cement slurry and its use

C - Chemistry, Metallurgy

09

K

31/33, 261/58

C09K 8/46 (2006.01) C04B 14/24 (2006.01) C04B 28/02 (2006.01)

Patent

CA 1126300

ABSTRACT OF THE DISCLOSURE A 9 to 12 ppg (1.08 to 1.4 kg/litre) cement slurry for use in oil well type completions which com- prises hydraulic cement about 10 to about 30 weight per- cent hollow glass microspheres based on the weight of the cement and sufficient water to form a pumpable slurry with an API free water content of no more than about 2 volume percent. This slurry is preferably mixed with an amount of water required to produce a slurry with the hydraulic cement having at least an API minimum water content and an API free water content of no more than about 2 volume per- cent and an additional amount of water equal to about 1.3 to about 1.8 weight percent water banned on the weight of the hydraulic cement for each weight percent of the micro- spheres. The microspheres have true particle densities of about 0.2 to about 0.5gm/cm3. hydrostatic collapse strengths of at least 500 psi (3447 ? and average par- ticle diameters of less than 900 microns.

331643

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