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Points to Ponder
Incredibly, depth correction is rarely done. No other industry would ignore such a large source of error that is so easy to model and correct for at a course level. A large percentage of the actual error can be removed with a simple application of mechanical and thermal stretch. Although the friction factor is a critical element it has very little effect on the final TVD. This is because when the inclination is low (high TVD effect) the friction is also low and when the friction is high (high angle) the effect of stretch on TVD is low.
Because software available today is able to predict torque and drag, there is no longer any excuse for ignoring depth error. Go ye into all the world and preach the gospel.
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