Author(s)

Hongyu Chen

Affiliation(s)

Sydney University, Sydney University Rd, Camperdown NSW 2006, Australia.

Corresponding Author

Hongyu Chen

ABSTRACT

In the stage of deepwater drilling, there is a risk of instability of the underwater wellhead under the vertical loads generated by BOP and casing operations and the environmental lateral loads such as wind, wave and current on the riser. The stress on the underwater wellhead before and after the installation of the deepwater drilling riser and BOP was analyzed, and a deepwater wellhead stability analysis model was established; combined with a deepwater well drilling example, the mechanical calculation of the underwater wellhead during the deepwater drilling stage was carried out, and the stability of the underwater wellhead was analyzed. A sensitivity analysis of the influencing factors was carried out. The example analysis shows that in the stage of deepwater drilling, the vertical bearing capacity of the underwater wellhead has little influence on it, but the lateral load has a greater influence on it; the top tension is positively correlated with the offset and dip angle of the underwater wellhead, and the bending moment is affected by the top tension. The effect is not obvious; the mud outlet height of the conduit has a great influence on the stability of the underwater wellhead; the change of the drilling fluid density has little effect on the bending moment of the underwater wellhead.

KEYWORDS

Deepwater drilling; Subsea wellhead; Stability; Influencing factors.

CITE THIS PAPER

Hongyu Chen. Analysis of the stability and influencing factors of underwater wellhead during deep water drilling. World Journal of Engineering Research. 2023, 1(1): 8-12.

REFERENCES

[1] Zhou Rongxin, Zhou Bo, Li Lei. Influence of Riser Top Tension on Underwater Wellhead System Stability. Petroleum Drilling Technology, 2018, 40 (S1): 98-100.

[2] da Costa Dfo, Rodrigues RS, Negrao AF. The e volume of de epw ater drilling in brazil. SPE 21158, 1990.

[3] KING GW. Drilling e engine e ring for s ubs ea de ve lopm e nt we lls. SPE 18687, 1990.

[4] Liu Shujie, Xie Yuhong, Yang Jin. Analysis of dynamic characteristics of marine deepwater drilling riser system. Petroleum Drilling Technology, 2009, 31 (3): 1-4.

[5] Thorogood JL, Train AS, Adams AJ. Deep water riser system design and m anage me nt. SPE 39295, 1998.

[6] Gong Dawei. Fault Analysis of Marine Riser. Petroleum Mining Machinery, 2003, 32 (5): 4-7.

[7] Wu Yi, Yang Jin, Li Chun. Analysis of mechanical properties of underwater wellhead based on ANSYS. Petroleum Machinery, 2011, 39 (12) : 35-37.

[8] API RP 2A- WSD, Re com mende d practice for planning, designing and cons tructing fixe d offs hore platforms workings tress design.

[9] Liu Shujie, Zhou Jianliang, Yang Jin, et al. Research on Prediction and Control Technology of Mud Entry Depth of Offshore Drilling Riser. China Offshore Oil and Gas, 2013, 25 (6) : 75-81.

[10] Zhang Hongkun. Research on the method of determining the key parameters of the jet down conduit in deepwater drilling. Qingdao: China University of Petroleum (East China), 2017.

[11] Su Kanhua, Guan Zhichuan. Analysis of Vertical Bearing Capacity of Deepwater Drilling Pipe and Surface Casing. Journal of Chongqing Institute of Science and Technology (Natural Science Edition), 2010, 12 (2) : 22-24 , 51.