Patent Number: 8,720,562

Title: Wellbore cementing compositions and methods of making and using same

Abstract: A method of cementing a wellbore comprising preparing a wellbore cementing composition comprising a cementitious materials and a modified biopolymer additive wherein the modified biopolymer additive is the reaction product of a process comprising contacting a biopolymer and an organic carbonate to form a reaction mixture and subjecting the reaction mixture to a temperature of from about 100.degree. F. to about 250.degree. F. and placing the wellbore cementing fluid in the wellbore. A method of cementing a wellbore comprising contacting a modified biopolymer additive with a cementitious slurry to produce a wellbore cementing composition having an initial viscosity, v.sub.0; placing the wellbore cementing composition to a desired depth in a subterranean formation wherein the wellbore cementing composition has a transitional viscosity, v.sub.t, during placement in the subterranean formation and a final viscosity, v.sub.f, at the desired depth wherein v.sub.f.gtoreq.v.sub.t>v.sub.0; and allowing the wellbore cementing composition to set.

Inventors: Reddy; B. Raghava (The Woodlands, TX), Patil; Rahul Chandrakant (Pune, IN), Pati; Sandip (Pune, IN)

Assignee: Halliburton Energy Services, Inc.

International Classification: E21B 33/13 (20060101)

Expiration Date: 5/13/12018