A crown block is the stationary section of a
block and tackle that contains a set of pulleys or
sheaves through which the
drill line
In a drilling rig, the drill line is a multi-thread, twisted ''wire'' rope that is threaded oreevedthrough in typically 6 to 12 parts between the traveling block and crown block to facilitate the lowering and lifting of the drill string into and ...
(wire rope) is threaded o
reevedand is opposite and above the
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 oreevedand is opposite (and under) the crown block (the stationary section).
The ...
.
The combination of the
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 oreevedand is opposite (and under) the crown block (the stationary section).
The ...
, crown block and wire rope
drill line
In a drilling rig, the drill line is a multi-thread, twisted ''wire'' rope that is threaded oreevedthrough in typically 6 to 12 parts between the traveling block and crown block to facilitate the lowering and lifting of the drill string into and ...
gives the ability to lift weights in the hundreds of thousands of pounds. When running heavy
casing strings hook loads occasionally exceed one million pounds.
See also
*
List of components of oil drilling rigs
This article lists the main components of a petroleum onshore drilling rig.
Offshore drilling rigs have similar elements, but are configured with a number of different drilling systems to suit drilling in the marine environment.
The equipment a ...
{{Petroleum-stub
Oilfield terminology
Drilling technology
Petroleum engineering