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In directional drilling, "Closure Direction" is the azimuth in degrees from well center to a particular point in the well bore. To determine your Closure Direction you need two numbers. The current Latitude(+N/-S) and the Departure(+E/-W) from well center.
The main thing to consider when calculating Closure Direction is which quadrant the coordinates are in, as it affects the calulation.
The formula to determine Closure Direction in Excel would be as follows:
=IF(AND(Latitude>0,Departure<0),ATAN(Departure/Latitude)*180/PI()+360,IF(Latitude<0,ATAN(Departure/Latitude)*180/PI()+180,ATAN(Departure/Latitude)*180/PI())))
Signed, Your friendly neighborhood MWD
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