Positional inaccuracies lead to poor drilling decisions

WELLBORE POSITIONING—2Rotary drilling with positive-displacement motors can introduce positional inaccuracies that remain undetected with stationary surveys and lead to potentially mistaken drilling decisions.Part 1 of this series, (OGJ, Oct. 27, 2003, p. 51) revealed where positional inaccuracies occur in horizontal wells and how frequently they happen when drilling with a conventional steerable, positive-displacement motor system.This article further illustrates positional issues using PDMs and then discusses rotary steerable systems and the impact of lithology on accurate well placement. The final installment in an upcoming issue will offer recommendations and techniques for mini...

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