Patent ID: 6273191
Filing Date: 2001-08-14
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 hydraulic cement, a water reducing additive comprised of a sulfonated naphthalene-formaldehyde condensate, a dispersing additive comprised of the condensation product of acetone, formaldehyde and sodium bisulfite, a compressive strength enhancing and set retarding additive comprised of a copolymer of acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid, a set accelerating additive and water present in an amount sufficient to form a pumpable slurry;(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.