Methods of cementing in subterranean zones

摘要

Improved methods of cementing in subterranean zones penetrated by well bores are provided. The methods are basically comprised of the steps of preparing a cement composition comprised of a hydraulic cement, a biodegradable, substantially non-dispersing set retarder of low anionic character comprised of polysuccinimide and sufficient water to form a slurry, placing said cement composition in said subterranean zone and allowing said cement composition to set into a solid mass therein.