Control of gas migration in well cementing

Details Control of gas migration in well cementing Control of gas migration in well cementing

C - Chemistry, Metallurgy

08

F

C08F 251/00 (2006.01) C04B 24/16 (2006.01) C04B 24/24 (2006.01) C04B 24/26 (2006.01) C04B 24/38 (2006.01) C09K 8/493 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2127069

A method of cementing a wellbore which penetrates a subsurface gas-containing formation is provided whereby gas migration is reduced. The method features the use of an additive consisting of a tannin backbone having grafted thereto at least two different vinylamide derivatives. The additive causes the cement slurry employed in the method to exhibit a Zero Gel Time of greater than about one hour, a Transition Time of less than about one hour and controls fluid loss from the slurry.

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