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DeploymentBorehole
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
º º º
PropertyDeviation angles from the true vertical depth trajectory
Sensor TypeAccelerometer
Units
SI°
SIOil MetricOil Field
(degree)
Oil Metric° (degree)
Oil Field° (degree)



Scope of Applicability

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 


Tool Schematic



Image Added


Mathematical Model



LaTeX Math Block
alignmentleft
\cos \theta(l) = \frac{dz}{dl}
LaTeX Math Block
alignmentleft
, \quad \tan \phi(l) = \frac{dydy^*}{dxdx^*}

where 

LaTeX Math Inline
bodyl = \int \sqrt{dx^2 + dy^2 +dz^2}
 – along-hole measured depth, depth 

LaTeX Math Inline
body\theta
 – is deviation from true vertical depth, 

LaTeX Math Inline
body\phi
 – azimutazimuth in tangent plane.