Application of Support Vector Machine in Friction Coefficient Prediction for Extended-Reach Well

Yun LI


Torque and drag is a major problem in the drilling process for extended-reach well due to the great well depth and large displacement. The value of friction & torque is mainly determined by friction coefficient value, and there are many factors affecting the coefficient friction, reasonable and correct determination of the friction coefficient is an issue that must be addressed in the friction & torque analysis and prediction. On the basis of the friction coefficient calculation, the prediction model of friction coefficient for designing well was established based on support vector machine, the results show its prediction accuracy is over 90%, the limitation of using experiences to determine friction coefficient was broken down in the process of well designing.


Torque and drag; Extended-reach well; Support vector machine; Friction coefficient; Prediction

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