| abstract |
A variety of methods and compositions are described, including, in one embodiment, a method of cementing in an underground formation comprising: introducing a cement composition comprising cement, water, and a lignite-based copolymer in an underground formation, in wherein the lignite base copolymer comprises a lignite column, 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 N , N-dimethylacrylamide; and allow the cement composition to set in the underground formation, where the cement composition has a transition time of less than or equal to about 150 minutes. |