A Preview of the Subsea Christmas Tree Installation Procedure

In the process of deep-water gas field development, the deep-water production system plays a key role, and the deep-water production system has been widely used in the development of the world’s offshore gas fields. In this paper, the author uses the X gas field as an example to introduce the subsea christmas tree installation procedure and the reliability of subsea tree production stage by using fault tree analysis (FTA). The installation procedure of the subsea christmas tree is divided into three steps: preparatory work before going in; pulling out the retracted part of the protective leg; using the tree running tool (LTRT) to install the subsea christmas tree. In this paper, the author introduces the installation procedure of subsea christmas tree detailedly, which is important in ensuring the independent and efficient development of offshore gas fields. According to the FTA analysis of throttle module, wellhead connector module and tubing hanger module, the average failure probability of subsea christmas tree production stage is 25.82 times every 106 hours, and the average failure interval is 4.42 years.