1)Derrick in usage,在用井架2)yellow dog,井架用灯3)jacket cap for drilling,钻井用导管架帽4)construction wrench,井架安装用扳手5)Production sinking headgear,生产凿井两用井架6)bulge derrick,钻杆盒在旁侧的井架
用法例句
The modification and application of jacket cap for drilling:case in reducing development cost of cluster of LD oil fields;