Definition - What does Lineal Deviation mean?
Lineal deviation refers to the differences between the lineal properties of actual vs. planned directional drilling paths. The word lineal is used to describe anything related to a line. In technical hole deviation technology, lineal deviation refers to the horizontal and vertical measurements determined during directional drilling operations. The four components of lineal deviation are msVD, RCVD, msHD, and RCHD.
Trenchlesspedia explains Lineal 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 deviations. While lineal deviation refers to horizontal and vertical properties of the drill path, angular deviation covers inclinational and azimuthal deviations.
Among the technical measurements taken during drilling, lineal deviation includes:
- msVD – vertical deviation
- RCVD – relative change in vertical deviation
- msHD – horizontal deviation
- RCHD – relative change in horizontal deviation
Hole deviation technology makes it possible for drill operators to adjust and improve geosteering response and evaluate the effectiveness of the drilling process.