Patent ID: 7390356
Filing Date: 2008-06-24
Classification: C04B,C09K,Y02W

Abstract:
1. A cementing composition for cementing a subterranean zone at temperatures of from about 200° F. to about 800° F., said composition comprising: a cement component comprising from about 30% to about 60% by weight of calcium aluminate, from about 2% to about 10% by weight of sodium polyphosphate and from about 10% to about 60% by weight of fly ash: water present in said cementing composition in an amount of from about 10% to about 80% by weight of said cement component; a retarder present in said cementing composition in an amount of from about 0.1% to about 10% by weight of said cement component; a defoamer present in said cementing composition in an amount of from about 0.1% to about 20% by weight of said cement component; a surfactant present in said cementing composition in an amount of from about 1% to about 5% by weight of said cement component; a latex selected from the group consisting of ethylene/vinylacetate, styrene butadiene, butadiene acrylonitrile and acetate ethylene, said latex present in said cementing composition in an amount of from about 15% to about 50% by weight of said cement component; and a lightweight additive comprised of glass spheres having a specific gravity of less than about 0.70 present in said cementing composition in an amount of from about 15% to about 50% by weight of said cement component, wherein said cementing composition has a density of less than about 10.5 pounds per gallon, and wherein when said cementing composition is set in a subterranean zone at temperatures of from about 200° F. to about 800° F., said set form of said cementing composition is resistant to alkali carbonation induced deterioration and maintains its compressive strength and competency.