Azimuthal Deviation (msAD)

Definition - What does Azimuthal Deviation (msAD) mean?

Azimuthal deviation (msAD) refers to the differences between the horizontal angles of actual and planned directional drilling paths. The word azimuthal is used to describe anything related to horizontal angles. In trenchless construction, azimuthal deviation is important in determining horizontal angles during directional drilling operations. Azimuthal deviation is one of the four components of angular deviation.

Trenchlesspedia explains Azimuthal Deviation (msAD)

Precise calculations are part of hole deviation logging and directional drilling when calibrating a bore path in real time. These numbers include both lineal and angular deviation. Angular deviation covers inclinational and azimuthal deviation and includes:

  • 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. The evaluation of angles provides greater detail beyond lineal deviation measurements.

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