Hole Deviation Log

Definition - What does Hole Deviation Log mean?

A hole deviation log is a powerful, visual representation of the differences between actual directional drilling progress and the drilling path that was planned. It is used to provide directional drillers with real-time feedback regarding the accuracy of the drilling operation. The display of geometrical deviations also allows for monitoring and evaluation of directional control performance.

Trenchlesspedia explains Hole Deviation Log

Prior to the drilling operation, the planned trajectory is plotted in the directional drilling system. As the operation progresses, differences between the planned and actual paths are plotted on the view screen. The hole deviation log is a valuable tool for drilling operators.

Technical hole deviations are shown in both vertical and horizontal senses. The components of technical hole deviation (THD) dealing with vertical deviation are msVD, RCVD, msID, and RCID. The horizontal technical hole deviation covers msHD, RCHD, msAD, and RCAD. These parameters are all part of THD logs. Both horizontal and vertical THD use associated log headers in their calculations.

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