水下采油树的使用始于1967年。水下采油树（Christmas tree）,应用于石油工业，主要用于悬挂下入井中的油管柱，密封油套管的环形空间，控制和调节油井生产，保证作业，录取油，套压资料，测试及清蜡等日常生产管理。
一种水下采油树，它在水平轴线上装有总闸门和流动控制设备，以便最大限度地降低装置的高度。
Christmas tree design for subsea applications, configured with the master valves and flow-control equipment on a horizontal axis to minimize the assembly height.
目前，智能完井技术在国外已经应用到水平井、大位移井、分枝井、边远井和水下采油树井及多层采油井和注水井。
Nowadays, smart well technique has been applied to horizontal well, offset well, multi-lateral well, remote area and subsea operation and also to production well and injection well.
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