Petroleum Engineering
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Item Performance evaluation and application of apparent viscosity models based on marsh funnel viscosity and mud density using high-temperature high-pressure field data(Melbourne Scientific Publishers, 2024) Ekanem, P.E.; Akintola, S.A.The exponential increase in global demand for energy has necessitated increased oil and gas operations in harsh terrains. This in turn requires high-level precision in operations as errors may lead to great implications on cost and resources. Drilling fluid plays a key role in the success of every oil and gas drilling operation. Therefore, monitoring and engineering of drilling fluid in real time to ensure its sustained suitability as it goes through different formations and conditions remain a priority. Different mathematical models have been researched to complement this effort. However, practical application of these models has not been addressed, creating a gap between theoretical solutions and practical applications. Field data from five different wells were used to evaluate the performance of five models in predicting the apparent viscosity of drilling fluids based on marsh funnel and mud density test results. The best prediction had root mean square errors of 2.57; R-squared of 0.71; mean absolute percentage error of 5%; and mean absolute error of 2.16. It was found that mathematical models could be used to predict apparent viscosity with high accuracy and that the models could be used to identify regions of concern during the drilling process by a simple history matching and comparing of the performance of the models on previous data using a particular model and comparing the result with results from other models to observe patterns. This work, for the first time, gives a practical application of mathematical models based on marsh funnel and mud density tests.