Article http://dx.doi.org/10.26855/ea.2023.12.009

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.


[1] Liu Shujie, Xie Renjun, Tong Gang, et al. Progress and prospect of deepwater drilling and completion technology of China National Offshore Oil Corp [J]. Journal of Petroleum, 2019, 40(S2): 168-173.

[2] Zhou Bo, Yang Jin, Zhou Jianliang, et al. Design method of conductor displacement under jetting for deepwater drilling [J]. Oil Drilling Technology, 2016, 44(3): 21-26.

[3] Yang Jin, Huang Xin, Yang Yuxiang, et al. Mechanical properties of a new type of expanded conductor for deepwater oil and gas wells[J]. Journal of Petroleum, 2019, 40(S2):116-122.

[4] Xu Yunjin, Yang Jin, Zhou Bo, et al. Determination of ultimate downward depth of surface conductor installed by jetting method in deepwater drilling [J]. Oil Drilling Process, 2016, 38(05): 553-557.

[5] Mackenzie B, Francis M, Garrett I, et al. Conductor jetting experiences in deepwater offshore Ghana—an investigation into geotechnical and operational influences on success, and establishment of future best practice [C]. One Petro, 2012.

[6] Xu Hui. Construction of a hazard evaluation system for air extraction zones based on hierarchical analysis [J]. Energy and Environmental Protection, 2020, 42(12): 12-19.

[7] Ma Xiaoxiang. Research on collaborative filtering algorithm based on improved weight calculation [D]. Jilin University, 2017.

[8] Wang Yanbin. Research on the mechanical behavior of deepwater conductor and riser installation process [D]. China University of Petroleum (Beijing), 2016.

[9] Wang Huanhuan, Yang Jin, Liu Zhengli, et al. Analysis of factors affecting cementation strength in deepwater shallow cemented wells [J]. Oil Drilling Technology, 2011.

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.

DOI: http://dx.doi.org/10.26855/ea.2023.12.009