METHOD OF CEMENTING IN A SUBTERRANEAN FORMATION USING CEMENT COMPOSITION COMPRISING LIGNITE - BASED GRAFTED COPOLYMERS.

摘要

A method of cementing in a subterranean formation comprising: introducing a cement composition comprising cement, water, and a lignite-based copolymer into a subterranean formation, wherein the lignite-based copolymer comprises a lignite backbone, a first grafted monomer selected from the group consisting of - acrylamido-2-methylpropanesulfonic acid, a salt of 2-acrylamido-2- methylpropanesulfonic acid, and a second grafted monomer comprising �,�-dimethylacrylamide; and allowing the cement composition to set in the subterranean formation, wherein the cement composition has a transition time of less than or equal to about 150 minutes.