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
Ton-Mile
Measurement of the accumulated stress on the drillstring cable. After a predetermined stress value, the cable is “slipped” and a predetermined portion is cut from the cable. The purpose of this is to avoid excessive accumulation of stress, which occurs at the points where the cable passes around the sheaves (pulleys). The length of cable to be cut from the cable is determined by S-N analysis of the cable material.
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