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
Torque
Torque on the drillstring can be measured by inserting a meter for that purpose in the drive train between the drive engine and the rotary table. When the drillstring locks up downhole, the torque on the string shows a steady increase, giving the driller time to stop rotation before reaching a torque value, which will twist off the drillstring. A quick rule of thumb is that each 1,000 feet of drillpipe can be twisted through 3 complete revolutions before reaching critical torque value.
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