Abstract
An oil-based drilling fluid system was formulated using rubber seed oil as base oil. Rubber seed oil was chosen because its aniline and flash points fall within the range of oils used as base oil. It is also locally available and easily affordable. The rheological (flow) properties of the rubber seed oil-based drilling fluid system were measured and results obtained show that the 10-sec and 10-min gel strength values for the formulated mud are 210lb/ft2 and 211lb/ft2 respectively while the mud density, plastic viscosity and yield point values are 10.60ppg, 1cP and 328lb/ft2 respectively. Comparison with the properties of a commercial oil-based drilling fluid show that the formulated mud has a high penetration rate and hole cleaning ability and so is effective in drilling operations although some disadvantages were observed.
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