Effect of a Naturally Derived Deflocculant (Black Myrobalan) on Rheological Behavior of Heavy Drilling Fluids


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.


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