Drilling process is the most important part of exploitation of hydrocarbon reservoirs and accomplishment of drilling a well is determined by proper choice of the drilling fluid. The drilling fluid is related either directly or indirectly to almost every drilling problem. Improvement of drilling fluid properties therefore would have direct impact on drilling process. Replacing common additives by more efficient additives is an alternative to reach this goal. Plant based additives are suitable materials which have been studying by researchers in recent years with aim of improving drilling fluid properties. In this study effect of Black Myrobalan (also called Terminalia Chebula) extract on rheological behavior of a heavy weight mud were investigated experimentally. To do this different concentrations of a Black Myrobalan solution (0.2, 0.6, 1.2, and 3 Vol %) were added to salt saturated mud and its rheological properties, filtration volume along with density and pH were measured. Furthermore effect of time aging and hot rolling at 200 °F was assessed. It was observed that Black Myrobalan decreases rheology of mud and increases filtration volume without affecting mud weight at both after and before hot rolling. Among rheological parameters yield point decreased more than other parameters. Moreover, hot rolling decreased the rheological parameters of mud while time aging increased them contrarily. The optimum concentration of Black Myrobalan in order to decrease rheology of mud was 1.2 Vol %. It was also observed that pH of mud decreased by increasing Black Myrobalan concentration. summarily Black Myrobalan acted as a deflocculant at concentrations up to 1.2 Vol %.
Keyword: Deflocculant, Black Myrobalan, Rheology, Aging, Hot rolling.
- Benyounes, K., Mellak, A., Benchabane, A. (2010). The Effect of Carboxymethyl cellulose and Xanthan on the Rheology of Bentonite Suspension. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. Vol. 32. No. 17. 1634-1643.
- Annis, M. R., Smith, V. (1996). Drilling Fluids Technology. Exxon Company. U.S.A.
- Amoco Production Company. (1994). Drilling Fluids Manual.
- Amanullah, M. (2007). Screening and Evaluation of Some Environment-Friendly Mud Additives to Use in Water-Based Drilling Muds. SPE paper No. 98054, presented at SPE E&P Environmental and safety Conference. Texas. U.S.A.. 5-7 March.
- Nmegbu, C.G.J., Bekee, B.A. (2014). Evaluation of Corn Cob Cellulose and its Suitability for Drilling Mud Formulation.
- International Journal of Engineering Research and Applications. Vol. 4. No. 5. 112-117.
- Narayana, P.Y. (2013). Rotary Drilling Mud. Part I. The Effect of Tannin on the Viscosity. Journal of Indian Institute of Science. Vol. 21. No. 169-178.
- Yusif, M., Khan, I.A., Khan, A.M. (2011). Characteristic Properties of Lakhra Lignite to be used as Drilling Mud Additive.
- SPE paper No. 156211. presented at SPE/PAPG Annual Technical Conference. Islamabad. Pakistan. 22-23 November.
- Meng, X., Zhang, Y., Zhou, F., Chu, P.K. (2012). Effects of carbon ash on rheological properties of water-based drilling fluids.  Journal of Petroleum Science and Engineering. Vol. 100. 1-8.
- Riyapan, T., Wannakomol, A. (2012). Filtration and Rheological Properties of Natural Rubber Latex Added Drilling Fluid.
- Suranaree Journal of Science and Technology. Vol. 18. No. 4. 249-254.