Weighted and unweighted aqueous mud formulations from a biomaterial, at cold temperature of 5°C, were tested for their rheological characteristics. Based on API guidelines and recommended equipment for drilling fluid tests, the rheological properties of the formulations were determined. The muds exhibited pseudoplastic behaviour. The fluid loss volumes of the weighted and unweighted muds are 14 and 21 ml, respectively, while the filter cake thicknesses are 2.5 and 3 mm, respectively. The yield stresses of the weighted and unweighted muds are 209 and 159 lb/100 ft2, respectively. Plastic viscosity of 42 cP for the weighted mud against 23 cP for the unweighted mud showed that the weighted mud has a better cutting lifting capacity if PV is used as an indicator. Mucuna solannie additive can also perform in cold temperature, and has the potential to be used in cold temperature drilling.
Key words: Biomaterial, cold temperature, fluid loss, rheological properties.
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