Drilling Industry Glossary
tail cement
tension limit
thribble
tie-back liner
ton-mile
toolpusher
TOC
TOL
torque
torque and drag
total depth (TD)
total flow rate (TFA)
traveling block
trip in
trip out
tripping
true vertical depth (TVD)
tungsten carbide
turbodrill
turnkey contract
twist-off
True Vertical Depth (TVD)
This is the vertical distance from the wellhead to a point in the wellpath. This quantity is calculated from the directional survey data. Note that a measured depth, due to the wellbore curvature, is always greater than the corresponding true vertical depth. It is commonly referred as TVD.
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