When is has been decided where we are going to drill, we put up at the surface an oil derrick.
当确定钻孔地点后，我们就在那里竖起一个井架。
As a new riser handling system, the vertical riser handling system is an extensional application of successful derrick drill stern vertical handling system in drilling machines.
隔水管垂直存放系统是一种新颖的隔水管处理系统，它是钻机行业井架内钻杆垂直存放系统成功解决方法的外延应用。
When it has been decided where we are going to drill, we put up at the surface an oil derrick.
当确定钻孔地点后，我们就在那里竖起一个井架。
When it has been decided where we are going to drill, we put up at the surface an oil derrick.
当确定钻孔地点后，我们就在那里竖起一个井架。
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