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...\rm s} + \mbox{D}_{\rm f} \left(\mbox{BHT} - \frac{\mbox{T}_{\rm s}}{\mbox{TD}}\right)</math> #*::: TD = total depth (BHT and TD must be from the same log run) (ft)

...x{T}_{\rm s} + \mbox{D}_{\rm f} \frac{\mbox{BHT} - \mbox{T}_{\rm s}}{\mbox{TD}}</math> * TD = total depth (make sure BHT and TD are from same log run)

* Anticipated total depth (TD) in measured depth (MD) and TVD (true vertical depth)

;TD:total depth

...tion will come to a stop. The end of the well is called the total depth or TD for short. At this point, the drill pipe is pulled out and wireline logs ma