Patent ID: 6613142
Filing Date: 2003-09-02
Classification: C04B,C09K

Abstract:
A storable composition for cementing oil and gas wells, containing blast-furnace slag as hydraulic material, activators, additives and an aqueous continuous phase forming a cementitious slurry,wherein the amount of activators in said composition based on the amount of slag is insufficient to effect the setting of the cementitious slurry for at least 72 hours at ambient temperature while providing an effective set time up to 24 hours in a wellbore at the wellbore temperature, said composition does not include a set inhibitor, and the composition comprises: (a) from 200 to 500 lb of blast-furnace slag per each bbl of slurry to be prepared; and (b) from 0.01 weight % to 13 weight % of activators, based on the weight of said slag; (c) the balance of the composition being made up of an aqueous continuous phase fluid and additives.