derrick or mast 井架或便携式井架
Do not leave pipe or collars that are not in use standing in mast or derrick.
不许在井架上排放用不着的钻杆和钻铤。
Tools carried into the derrick or mast should be secured to the body.
带到井架上的工具应当绑在身上。
The fixed set of pulleys (called sheaves) located at the top of the derrick or mast, over which the drilling line is threaded.
位于重型井架或桅架式井架顶部的固定的滑轮组（称之为滑车轮槽轮），通过该滑轮组钻井钢丝绳进行穿绳。
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