Directional Calc TVD tab

.A good percentage of survey data generated from directional companies starts at a “kick off point” well below 0’MD.   MD, INC, and AZI data by itself simply tells where each successive survey is in relation to the previous survey - not in relation to the surface location.  The Calc TVD tab computes the wellbore’s path from a user-specified “kick-off” point.  

The Directional Survey Data's Calc TVD tab

Put another way, when loading only MD, INC, and AZI with no offset data from a kickoff point, Petra needs to know where this data starts in order to calculate an accurate model of the wellbore’s position.  To use this utility, enter in the MD, TVD, XOFFSET (E+W-), YOFFSET (N+S-), INC, and AZI of the kick off.  Select the “Compute TVD From MD” button to compute XOFF and YOFF data