Engineering Advances

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Analysis Method of Underwater Wellhead Stability of Unstable Seabed Oil and Gas Wells

Jiwen Liang1,*, Shujie Liu1, Yilong Xu1, Mengjie Lu2, Wentuo Li3, Xiaodong Yu3

1Cnooc Hainan Energy Co. Ltd., Haina, China.

2Cnooc (China) Co., Ltd. Hainan branch, Hainan, China.

3China University of Petroleum (Beijing), Beijing, China.

*Corresponding author: Jiwen Liang

Published: January 19,2024


Drilling safety and efficiency are greatly affected by shallow seabed environments in deep water, including shallow geological hazards, seabed geomorphology, and seabed dip Angle. The underwater wellhead is built on the seabed, and the stability of the seabed determines the stability of the underwater wellhead. Based on multi-body dynamics, the coupling model of the drilling platform-riser-surface conduit system is established, and the key factors affecting the stability of the wellhead are analyzed. The results show that the maximum lateral displacement and the maximum stress of the surface conduit increase linearly with the increase of the slope Angle of the surface conduit and with the increase of the mud discharge height of the surface conduit. Therefore, in the field operation, the stability of the wellhead can be improved by reducing the mud height and increasing the surface conduit size in the unstable seabed environment.


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How to cite this paper

Analysis Method of Underwater Wellhead Stability of Unstable Seabed Oil and Gas Wells

How to cite this paper: Jiwen Liang, Shujie Liu, Yilong Xu, Mengjie Lu, Wentuo Li, Xiaodong Yu. (2023). Analysis Method of Underwater Wellhead Stability of Unstable Seabed Oil and Gas Wells. Engineering Advances3(6), 488-492.