Abstract
Chinas offshore oil and gas has been developed from shallow water to deep water. Subsea production facilities play more and more role in deepwater oil and gas fields, in which Christmas tree is the key equipment to control and regulate the oil well production of deepwater production systems, but it has great installation costs and risk. For complex underwater environment, it is necessary to find a best way to install the Christmas tree securely and rapidly. ROV (Remotely Operated Vehicle) is wildly used in the field of offshore oil, especially in deep water for its large working depth, safe, efficient and other characteristics, and it has become an indispensable tool for development of deep-sea oil and gas. In one Christmas tree installation at Liwan3-1 deepwater oilfield, the ROV succeeded in assisting the installation of Christmas tree. The solutions for winding and wrong operation risk in installation process are given in the end.
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