A modified cellulose-based polymer has been tested according to API recommended practices in various cement slurries and was identified to have multiple beneficial functions in addition to be environmentally friendly. Test results demonstrate that this single additive controls fluid loss better than commonly used fluid loss additives at temperatures up to 170 °F while also controlling free fluid and performing as an extender. In addition, it was found to work as a foam stabilizer and gas control agent in cement slurries, which was not observed for any other cellulose-based polymers tested. The modified cellulose-based polymer also exhibits less slurry viscosification, which facilitates surface mixing and pumping of the corresponding cement slurries. This paper will describe test procedures, discuss test results, and demonstrate that a single modified cellulose-based polymer can replace several additives in a cement system to adjust the required cement slurry performances for optimum placement and properties in the wellbore. These findings are accomplished by a case history showing the successful application of the modified cellulose-based polymer for a deepwater cementing operation in the South China Sea. The here presented multifunctional biopolymer simplifies cement slurry design and operations contributing to higher quality cement jobs.
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