A simple, practical approach provides a technique for calibrating tortuosity factors.

The methodology uses actual survey data and known surface hook loads for different operating conditions, such as tripping in, tripping out, and rotating off bottom, to arrive at appropriate friction factor values that can be further used in torque and drag calculations.Once one determines the friction factors for both cased hole and open hole, sensitivity analyses can be performed on the planned survey. One can then arrive at the appropriate tortuosity values by comparing predicted results with the field driller's data.Determining the tortuosity factors to apply in a well model is a challenge often encountered during well planning. No quantification method has been available. A criti...

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