CONTROLLED ACTIVATION OF EXTENDED-LIFE CEMENT COMPOSITIONS

摘要

Methods, compositions, and systems for cementing are included. The method comprises providing an extended-life cement composition comprising calcium-aluminate cement, water, a cement set retarder, and a delayed-release cement set activator. The method further comprises introducing the extended-life cement composition into a subterranean formation and allowing the extended-life cement composition to set in the subterranean formation. The extended-life cement composition has a thickening time of about two hours or longer.