在深水环境中,钻井船是通过立管连接到底部的,并通过它进行钻井和修井作业。在立管的底部,一套下部海洋立管组件起着一个大阀门的作用,它可以通过压送管线从钻井船上进行控制。传统立管的缺陷是:第一,由于水压对浮力材料的作用,要求浮力块非常坚固,这就意味着水越深浮力块的效? In deepwater environments, the rig is connected to the bottom through a riser and drills and workover passes through it. At the bottom of the riser, a lower marine riser assembly acts as a large valve that can be controlled from the rig by a transfer line. The drawbacks of the traditional riser are: First, because of the effect of water pressure on the buoyant material, the buoyancy block is very strong, which means that the deeper the water is, the more effective the buoyancy block will be.