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Nguyen Huu Truong


Bentonite/polymer fluid systems are often used to drill wells in the top of basement formation of the continental shelf of Vietnam, where the formation pressure gradient gradually reaches to subnormal pressure. Thus, bentonite/polymer drilling fluids with the mud weight from 8.4 ppg to 8.5 ppg are able to drill this section. In this study, the effect of the polymer concentrations on the initial parameters of the drilling fluid models have been presented in the detail of the article. Moreover, non-Newtonian fluid models often describe the behavior of fluids, which the models as Bingham plastic, Power law, Casson model, Herschel Bulkley, and Robertson-Stiff have mentioned. To determine the initial parameters of the models, the mathematical least square method is used. The database was gathered from 6 dial readings as 600 rpm, 300 rpm, 200 rpm,
6 rpm and 3 rpm of API 13B standard. Finally, the ANOVA table analysis shows that the confident coefficient reaches 100%, which has been demonstrated to be highly significant by the models.


Polymer concentration, initial model parameter, bentonite/polymer drilling fluid


Darley, H. C., and Gray, G. R., 1988. Composition and properties of drilling and completion fluids. Gulf Professional Publishing.

Salamone, J. C., Clough, S. B., Salamone, A. B., Reid, K. I. G., and Jamison, D. E., 1982. Xanthan Gum-A Lyotropic, Liquid Crystalline Polymer and its Properties as a Suspending Agent. Society of Petroleum Engineers Journal, 22(4), 555-556.

Bourgoyne Jr, A. T., Millheim, K. K., Chenevert, M. E., and Young Jr, F. S., 1986. Applied drilling engineering. Volume 2.

Kelessidis, V. C., Maglione, R., Tsamantaki, C., and Aspirtakis, Y., 2006. Optimal determination of rheological parameters for Herschel–Bulkley drilling fluids and impact on pressure drop, velocity profiles and penetration rates during drilling. Journal of Petroleum Science and Engineering, 53(3), 203-224.

Casson, N., 1959. In reheology of dipersed system.

Khataniar, S., Chukwu, G. A., and Xu, H., 1994. Evaluation of rheological models and application to flow regime determination. Journal of petroleum science and engineering, 11(2), 155-164.

Fordham, E. J., Bittleston, S. H., and Ahmadi Tehrani, M., 1991. Viscoplastic flow in centered annuli, pipes, and slots. Industrial & engineering chemistry research, 30(3), 517-524.

Menezes, R. R., Marques, L. N., Campos, L. A., Ferreira, H. S., Santana, L. N. L., and Neves, G. A., 2010. Use of statistical design to study the influence of CMC on the rheological properties of bentonite dispersions for water-based drilling fluids. Applied Clay Science, 49(1), 13-20.

Bailey, W. J., and Weir, I. S., 1998. Investigation of methods for direct rheological model parameter estimation. Journal of Petroleum Science and Engineering, 21(1), 1-13.

Robertson, R. E., and Stiff Jr, H. A., 1976. An improved mathematical model for relating shear stress to shear rate in drilling fluids and cement slurries. Society of Petroleum Engineers Journal, 16(1), 31-36.

Beirute, R. M., and Flumerfelt, R. W., 1977. An evaluation of the Robertson-Stiff model describing rheological properties of drilling fluids and cement slurries. Society of Petroleum Engineers Journal, 17(2), 97-100.

Gucuyener, I. H., 1983. A rheological model for drilling fluids and cement slurries. In Middle East Oil Technical Conference and Exhibition. Society of Petroleum Engineers.

Gücüyener, I. H., and Mehmetog, T., 1996. Characterization of flow regime in concentric annuli and pipes for yield-pseudoplastic fluids. Journal of Petroleum Science and Engineering, 16(1-3), 45-60.

Gücüyener, I. H., Celik, M., Turcan, H. H., Erkekol, S., Evin, S., Alp, B., and Özel, R., 2001. Application and Results of the KCL/Polymer Mud in Drilling Operations in Thrace Basin. In Proceedings of 13th International Petroleum Congress and Exhibition of Turkey.

Herschel, W. H., and Bulkley, R., 1926. Measurement of consistency as applied to rubber-benzene solutions. In Am. Soc. Test. Proc., 26(2), 621-633.

Al-Zahrani, S. M., 1997. A generalized rheological model for shear thinning fluids. Journal of Petroleum Science and Engineering, 17(3-4), 211-215.

Bingham, E. C., 1922. Fluidity and plasticity (Vol. 2). McGraw-Hill Book Compny, Incorporated.

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Journal of Marine Science and Technology ISSN: 1859 3097

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