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Received: January 15, 2018 Revised: May 15, 2018 Accepted: September 11, 2018 Abstract: Introduction: Drilling fluid selection plays a key role in preventing major problems encountered during drilling operations such as hole pack-off, stuck pipe and loss circulation. Mud contamination which results from the overtreatment of the mud system with additives or foreign material entering the mud system during drilling operations causes unwanted changes in the properties of the mud. This makes the mud system inefficient in performing its major roles. This research studies the effects of monovalent and divalent salts namely Potassium Chloride, Calcium Chloride, and Magnesium Chloride on the rheological properties of water-based mud system which is most vulnerable to contamination.

Evaluating the Effects of Monovalent and Divalent Salts on the Rheological Properties of Water Based Mud