Well cementing compositions for cold environment

Details Well cementing compositions for cold environment Well cementing compositions for cold environment

E - Fixed Constructions

21

B

E21B 33/13 (2006.01) C09K 8/46 (2006.01) C09K 8/493 (2006.01)

Patent

CA 2469898

The present invention provides improved well cementing compositions for use in cold environment, where the circulating temperature of the cement is typically within the range of 5 to 20~C. The improved well cementing compositions are essentially comprised of an aqueous fluid, a hydraulic cement binder and a set- accelerating admixture comprising an alkali or alkaline earth metal nitrate and an alkali or alkaline earth metal nitrite.

La présente invention concerne des compositions améliorées de cimentation pour puits qui sont destinées à être utilisées dans un environnement froid, dans lequel la température de circulation du ciment est en général comprise entre 5 et 20 ·C. Les compositions améliorées de cimentation pour puits sont principalement constituées d'un fluide aqueux, d'un liant de ciment hydraulique et d'un adjuvant accélérant le durcissement comprenant un nitrate de métal alcalin ou un nitrate de métal terreux alcalin et un nitrite de métal alcalin ou un nitrite de métal terreux alcalin.

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