-RT: is the Rotary Table
-MD: is the Measured Depth which is the distance between the rotary table to the end of well.
-KB: is the Kelly Bushing which is the distance between rotary table & the mean seal level (MSL)
-MDss: is the Measured depth sub sea which is the distance between mean sea level (MSL) to the end of well (MDss=MD-KB).
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