Friction Coefficient Prediction Method for Extended-Reach Well Based on Grey Prediction

Guangtong FENG


Torque and drag prediction is very crucial in the design and drilling of extended-reach well, which has relation to the success or failure of drilling, while the torque and drag prediction result is greatly affected by the value of friction coefficient. Firstly, using the modified 3D soft-string calculation model, the friction coefficient of upper wellbore section was obtained. Then referring the related mathematical methods of system theory, on the basis of the friction coefficient of upper hole section, the friction coefficient prediction model for impending drilling well segment was established based on grey prediction, the prediction results show the error of friction coefficient and hook load is less than 10%. The method could satisfy the engineering requirement, which provides a theoretical guidance for real-time supervision on torque and drag in the drilling of extended-reach well.


Extended-reach well; Friction coefficient; System theory; Grey prediction; Real-time supervision

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