Downhole logging sensor measuring the deviation of the tool from the true vertical depth trajectory
Log Name = DEV, AZIM
Measured property = acceleration of the tool motion
Scope of Applicability
Mathematical Model
\cos \theta(l) = \frac{dz}{dl}, \quad \tan \phi(l) = \frac{dy^*}{dx^*} |
where
l = \int \sqrt{dx^2 + dy^2 +dz^2} – along-hole measured depth
\theta – is deviation from true vertical depth
\phi – azimuth in tangent plane.