FIELD: cementing operations.
SUBSTANCE: invention relates to a method for cementing wells. The method of cementing wells includes: providing a composite cement composition containing at least one pozzolan, an accelerator and water, while the accelerator contains chloride salt and sulfate salt, while the composite cement composition does not contain Portland cement or contains Portland cement in an amount of about 50 wt.% Binders components or less; and allowing the composite cementitious composition to set, wherein the accelerator is present in an amount of from about 1 wt% to about 10 wt% of the binders, and wherein the chloride salt and sulfate salt are present in a weight ratio of chloride salt to sulfate salt of about 10:90 to about 90:10. Also described is a composite cement composition for cementing wells.
EFFECT: invention makes the process of cementing wells more effective.
15 cl, 2 ex, 4 tbl, 6 dwg
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