Method of cementing well casing to avoid gas channelling from sh

Details Method of cementing well casing to avoid gas channelling from sh Method of cementing well casing to avoid gas channelling from sh

1990-11-30

1993-04-06

Suchfield, George A.

Wells

Processes

With indicating, testing, measuring or locating

166291, 166292, F21B 33138, F21B 3316

Patent

active

051994895

ABSTRACT:
Gas channeling to the surface in the setting of surface casing can be avoided by employing a cementing process 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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Smith, Dwight K., "Cementing Additives", Cementing, 1987, pp. 18, 19, 20, 36.

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