METHODS OF CEMENTING SUBTERRANEAN ZONES

摘要

Improved methods of cementing in a subterranean zone penetrated by a well bo re are provided. The methods are basically comprised of the steps of preparing a foamed cement composition comprised of hydraulic cement, a non-dispersing set retarder, sufficient water to form a slurry, sufficient gas to foam the slurry and a foaming and foam stabilizing surfactant mixture present in an amount sufficient to facilitate the formation of the foam and stabilize the foamed cement composition.