A dynamic model for non-Newtonian drilling fluid's filtration in casing drilling technology

Farahani, M. Vasheghani and Salehian, M. and Jamshidi, S.; (2021) A dynamic model for non-Newtonian drilling fluid's filtration in casing drilling technology. In: 82nd EAGE Conference and Exhibition 2021. European Association of Geoscientists and Engineers, EAGE, NLD, pp. 221-225. ISBN 9781713841449 (https://doi.org/10.3997/2214-4609.202010307)

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Abstract

Casing Drilling is a recent technology for simultaneously drilling and casing a well. Using casing instead of conventional drill pipe results in a relatively small annular space between the conduit and wellbore, where the shear rate caused by drill pipe rotation can significantly affect the mud cake thickness. Previous studies have developed dynamic models to estimate mud cake characteristics in conventional drilling operations, however, the detailed information regarding the impact of drill pipe rotation on mud cake and formation damage has not been deeply addressed yet. This study presents a dynamic model for mud filtration in an isothermal radial system, while considering the impact of shear rate on mud cake thickness and filtration radius. Here, we use the Power-Law as the rheological model of the non-Newtonian drilling fluid. Results show the necessity of considering drill pipe rotation effect in dynamic flow calculations, highlighting the advantage of here-developed model for accurate estimation of mud cake characteristics in casing drilling operations.

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