WATER-BASED DRILLING

Drilling mud , otherwise known as drilling fluid, is a vital component in the oil and gas industry. As the primary medium for drilling oil and gas wells, its importance cannot be overstated. However, in Nigeria, the procurement of drilling mud is often costly, as bentonite clay, the conventional material used in its formulation is largely imported. This project investigates the suitability of a locally sourced clay, Okuaghe, obtained from one of the countries numerous clay deposits, as a potential substitute for imported bentonite in drilling mud formulation. The study aims to promote local material utilization, reduce import dependency, and minimize overall operational costs. The clay sample was collected from Uhunmwonde local government area in Edo State, then prepared through drying, crushing, and sieving. Portions of the total sample were activated using soda ash (sodium carbonate) to enable comparative analysis. Guided by API specifications, rheological properties such as plastic viscosity, apparent viscosity, yield point and gel strength were determined using standard procedures. Additionally, carboxymethyl cellukose (CMC) was incorporated in some samples to enhance performance toward API standards. The results indicates that the local clay possesses promising potential for drilling mud formulation, provided adequate beneficiation and optimization of activation conditions are applied. The findings also emphasize the importance of maintaining optimal base concentration during chemical activation, as excessive amounts may yield adverse effects. Overall, this laboratory-based study demonstrates that certain local clays, when properly treated and modified with suitable additives, can perform comparably to imported bentonite. It further underscores the need for field-scale evaluation to validate laboratory results and support the wider adoption of local materials in drilling fluid formulation.