C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 24/00 (2006.01) C04B 22/00 (2006.01) C04B 22/06 (2006.01) C04B 22/12 (2006.01) C04B 24/12 (2006.01) C04B 28/02 (2006.01) C04B 40/06 (2006.01) C09K 8/46 (2006.01) E21B 33/13 (2006.01)
Patent
CA 2183489
An oil and gas well cementing composition and method are shown utilizing hydraulic cement, water a cement hydration retarder and an additive which is effective over a selected time period to degrade the retarder. The additive is a controlled release oxidizer which releases nascent oxygen over time to gradually oxidize the cement hydration retarder, thereby providing a single cement slurry design for cementing pipes for oil and gas wells where wide temperature differentials exist between the two ends of the pipe.
Description d'une composition et d'une méthode de cimentation des puits de pétrole et de gaz utilisant du ciment hydraulique, de l'eau, un retardateur d'hydratation du ciment et un additif qui est efficace pour une période de temps déterminée pour décomposer le retardateur. L'additif est un oxydant à libération contrôlée qui, avec le temps, libère l'oxygène naissant pour oxyder graduellement le retardateur d'hydratation du ciment, ce qui permet d'obtenir un seul type de laitier de ciment pour la cimentation des tubes des puits de pétrole et de gaz dans lesquels il y a de fortes différences de température entre les deux extrémités du tube.
Bj Services Company
Gowling Lafleur Henderson Llp
LandOfFree
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