A method of cementing a well penetrating a subterranean formation and having a deviated section (21) of more than 55 degrees angle of inclination in which a plurality of cement slurries (25, 35) are employed, at least one of which is less dense than the drilling fluid employed to drill the well, and allowing the cement to set up in the well and to bond in situ and provide zonal isolation and good bonding of equipment in the wellbore. The cement slurry may include micro-spheres of fly ash or borosilicate to reduce free water voids of channels in the cement.
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