Patent ID: 7604053
Filing Date: 2009-10-20
Classification: C04B,C09K,Y02W

Abstract:
1. A method of cementing a wellbore in a subterranean formation, comprising: selecting a target density of a final cement composition, wherein the target density is from about 5 to about 7.5 pounds per gallon of cement composition; forming a base cement composition, wherein the base cement composition has a first density greater than the target density by a density factor of from about 1.01 to about 1.4, and wherein the base cement composition comprises a cement, a water, and a density reducing additive; adding a sufficient amount of a gas to the base cement composition to reduce the first density to about the target density, thereby forming the final cement composition; placing the final cement composition in the wellbore; and allowing the final cement composition to set.