Patent ID: 8720563

Claim:
A method of cementing in a subterranean formation comprising: introducing a cement composition into the subterranean formation, wherein the cement composition comprises: (A) a calcium aluminate cement; (B) water; (C) an organic acid; and (D) a polymeric mixture comprising: (i) water; (ii) citric acid; (iii) a first polymer, wherein the first polymer: (a) comprises a cellulose backbone and carboxymethyl functional groups; and (b) has a molecular weight of less than 100,000; and (iv) a second polymer, wherein the second polymer: (a) comprises a lignosulfonate; and (b) has a molecular weight of less than 100,000, wherein a test composition consisting essentially of: the cement; the water; the organic acid; and the polymeric mixture, and in the same proportions as in the cement composition has a thickening time of at least 5 hours at a temperature of 300° F. (148.9° C.) and a pressure of 10,000 psi (68.9 MPa); and allowing the cement composition to set.