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Deployment	Borehole
Log Name	DEV, AZIM
Measured Property	Deviation angles from the true vertical depth trajectory
Sensor Type	Accelerometer
Units
SI	° (degree)
Oil Metric	° (degree)
Oil Field	° (degree)

Applications

Assess tool orientation in 3D space
Depth Matching between cased-hole logs and well schematic based on location of tubing/casing collars
Correct pressure gradient for well deviation to assess fluid density and fluid friction model

LaTeX Math Block

alignment	left

\cos \theta(l) = \frac{dz}{dl}, \quad \tan \phi(l) = \frac{dy^*}{dx^*}

where

LaTeX Math Inline

body	l = \int \sqrt{dx^2 + dy^2 +dz^2}

– along-hole measured depth

LaTeX Math Inline

body	\theta

– is deviation from true vertical depth

LaTeX Math Inline

body	\phi

– azimuth in tangent plane.