Deviation log, new formulae aid directional drillers

New formulae that mathematically define technical hole deviation, aided by hole deviation logs, provide directional drillers with new methods for rationalizing tool settings.The eight components that collectively define directional-drilling relationships are presented in the format of two separate well logs.A method is detailed for finding the minimum distance between a survey station and the planned path, and the corresponding planned measured depth. Additionally, a new type of well design, which is entirely practical, given the advent of rotary-steerable directional drilling tools, is introduced to address transitions between linear and curved hole sections.ImportanceTechnical hole devi...

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