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
Traveling Block
A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section).
The combination of the traveling block, crown block and wire rope drill line gives the ability to lift weights in the hundreds of thousands of pounds. On larger drilling rigs, when raising and lowering the derrick, line tensions over a million pounds are not unusual.
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