Deviation log, new formulae aid directional drillers

08/09/1999
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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