Deviated Well (Directional)

Deviated Well (Directional):
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1) -TVD: True Vertical Depth which is the vertical distance from a point in the well to a point at the rotary table.

2) -TVDss: true Vertical Depth Sub Sea which is the vertical distance from a point in the well to the mean seal level.

3) -MD: Measured Depth (always>TVD)

4) Ө: Angle of inclination which is angle of deviated well with respect to its vertical origin

5) A: Azimuth which is angle of deviated well with respect to Magnetic North
Pole.