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Umbrella drilling derrick 伞形钻架
oil drilling derrick 石油钻机井架
drilling derrick platform 钻塔平台
ocean drilling derrick 海洋钻井井架
mobile drilling derrick 移动式钻井起重机
drilling derrick components 井架构件
Heavy-duty drilling derrick 高钻架
triple derrick drilling rig 三层井架钻机
drilling rig derrick 钻机井架
Drilling derrick that working many years often has the defect of bending bar.
服役多年的钻机井架常会出现局部杆件弯曲现象。
Equipped with suitable derrick and well controlled device in drilling a shallow gas well water drills proved to be able to reduce shallow gas well drilling cost.
通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。
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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