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"With my study and practice works performed on live well data, I observed that the calculations based on Tangential Method gives a considerably large value of departure and in some cases the well appears to be too shallow.
In some deviated wells, the error in TVD was more than 40-50 feet."This technique provides a smoother curve which should more closely approximate the actual wellbore between surveys.
The curvature of the arc is determined by the survey inclinations and azimuths at the upper and lower survey stations as shown in Figure below.
The length of the arc between I have hands-on experience on few well planning softwares based on this method.
If survey intervals were 10 feet or less, the error would be acceptable.
The added expense of surveying every 10 feet prohibits using the tangential method for calculating the wellbore course especially when more accurate methods are available.
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When her lover gets her naked he strokes her body and slides his fingers down to her manko and pushes them deep inside.This is the ERROR we found using "Radius of Curvature Method".