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The angle 
\theta at which a pipeline or well trajectory diverges from true vertical direction  z(l):

(1) \cos \theta (l) = \frac{dz}{dl}

where 

l

path length along the trajectory


Fig. 1. Deviation angle \theta along the trajectory


See also


Natural Science / Physics / Measuring / Positioning / Trajectory

 Deviation Data ] Azimuthal deviation ]


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