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

Mathematical Model

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

where 

 – along-hole measured depth 

 – is deviation from true vertical depth

 – azimuth in tangent plane.