INCL (Inclinometer Logging Tool)

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

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

where

$\begin{array}{l}l = \int \sqrt{dx^2 + dy^2 +dz^2}\end{array}$ – along-hole measured depth

$\begin{array}{l}\theta\end{array}$ – is deviation from true vertical depth

$\begin{array}{l}\phi\end{array}$ – azimuth in tangent plane.