Angular Deviation

Published: May 20, 2017 | Last updated: July 5, 2023

What Does Angular Deviation Mean?

Angular deviation refers to the differences between angular properties of actual vs. planned directional drilling paths. The word angular is used to describe anything related to an angle. In technical hole deviation technology, angular deviation refers to inclinational and azimuthal measurements noted during directional drilling operations. The four components of angular deviation are msID, RCID, msAD, and RCAD.


Trenchlesspedia Explains Angular Deviation

Precise calculations, as part of hole deviation logging, aid directional drillers in calibrating a bore path in real time. These calculations include both lineal and angular deviation. While lineal deviation deals with horizontal and vertical properties of the drill path, angular deviation covers inclinational and azimuthal deviations.

Among the technical measurements taken during drilling, angular deviation includes:

  • msID – inclinational deviation
  • RCID – relative change in inclinational deviation
  • msAD – azimuthal deviation
  • RCAD – relative change in azimuthal deviation

Hole deviation technology makes it possible for drill operators to adjust and improve geosteering response and evaluate the effectiveness of the drilling process.


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