WELLBORE POSITIONING-CONCLUSION: Different approaches can minimize problems with nonconstant curvature

Changes in directional drilling and surveying practices could lead to a reduction in positional errors arising from nonconstant wellbore curvature.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 (PDM) system.Part 2 (OGJ, Nov. 3, 2003, p. 50) further illustrated positional issues using PDMs and then discussed rotary steerable systems and the impact of lithology on accurate well placement.This final installment offers recommendations and techniques that can minimize the problem.While drilling, postdrilling surveysMany hav...

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