Method of cementing well casing to avoid gas channelling...

Details Method of cementing well casing to avoid gas channelling... Method of cementing well casing to avoid gas channelling...

E - Fixed Constructions

21

B

166/17

E21B 33/14 (2006.01) C09K 8/42 (2006.01) E21B 33/16 (2006.01)

Patent

CA 2004393

PATENT C-56201 ABSTRACT Gas channelling to the surface in the setting of surface casing can be avoided by employing a cementing processing in which a right-angle setting cement is positioned within a wellbore annulus between the wellbore and the casing above a gas-bearing zone with a low fluid loss cement slurry being placed below the right-angle setting cement. Pumping of the cement slurry is stopped for a period of time to allow the setting of the right-angle setting cement at which point pressurized pumping is resumed to displace remaining portions of the low fluid loss cement slurry into the wellbore annulus against the plug created by the set right-angle setting cement to block off gas migration and squeeze the low fluid loss cement into the gas-bearing zone.

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