After a drum is dismounted, a spared drum can be located on the drawworks by the hoisting unit, thereby the truck can te put into operation on another well.
然后再利用小吊架吊起一个备用滚筒安装在绞车上，载车就可载着绞车到其他油井继续作业。
After a drum is dismounted, a spared drum can be located on the drawworks by the hoisting unit, thereby the truck can te put into operation on another well.
然后再利用小吊架吊起一个备用滚筒安装在绞车上，载车就可载着绞车到其他油井继续作业。
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