Patent ID: 6336505
Filing Date: 2002-01-08
Classification: C04B,C09K

Abstract:
An improved method of cementing a casing string in a deep water offshore formation penetrated by a well bore comprising the steps of:(a) preparing a cement composition comprised of a single hydraulic cement; sufficient water to form a pumpable slurry; a gas present in an amount sufficient to form a foam; a mildly set retarding mixture of cement composition foaming and foam stabilizing surfactants present in an effective amount; a cement set and strength accelerating agent; and a mildly set retarding cement dispersing agent; wherein said cement set and strength accelerating agent and said mildly set retarding cement dispersing agent are present in said composition in a weight ratio and an amount such that said cement composition has a thickening time in the range of from about 3 to about 5 hours and develops a compressive strength in the range of from about 400 psi to about 600 psi at a temperature in the range of from about 45Â° F. to about 55Â° F. within 24 hours; (b) placing said cement composition in the annulus between said casing and said well bore; and (c) allowing said cement composition to set into a hard impermeable mass therein.