Study on the Evolution Law of Wellbore Stability Interface during Drilling of Offshore Gas Hydrate Reservoirs

Xuefeng Li, Baojiang Sun (), Baojin Ma, Hao Li, Huaqing Liu, Dejun Cai, Xiansi Wang and Xiangpeng Li
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Xuefeng Li: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Baojiang Sun: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Baojin Ma: CNPC Offshore Engineering Company Limited, Beijing 100028, China
Hao Li: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Huaqing Liu: CNPC Offshore Engineering Company Limited, Beijing 100028, China
Dejun Cai: CNPC Offshore Engineering Company Limited, Beijing 100028, China
Xiansi Wang: CNPC Offshore Engineering Company Limited, Beijing 100028, China
Xiangpeng Li: CNPC Offshore Engineering Company Limited, Beijing 100028, China

Energies, 2023, vol. 16, issue 22, 1-17

Abstract: The study of wellbore stability in offshore gas hydrate reservoirs is an important basis for the large-scale exploitation of natural gas hydrate resources. The wellbore stability analysis model in this study considers the evolution of the reservoir mechanical strength, wellbore temperature, and pressure parameters along the depth and uses plastic strain as a new criterion for wellbore instability. The wellbore stability model couples the hydrate phase transition near the wellbore area under the effect of the wellbore temperature and pressure field and the ‘heat–fluid–solid’ multifield evolution characteristics, and then simulates the stability evolution law of the wellbore area during the drilling process in the shallow seabed. The research results show that, owing to the low temperature of the seawater section and shallow formation, the temperature of the drilling fluid in the shallow layer of the wellbore can be maintained below the formation temperature, which effectively inhibits the decomposition of hydrates in the wellbore area. When the wellbore temperature increases or pressure decreases, the hydrate decomposition rate near the wellbore accelerates, and the unstable area of the wellbore will further expand. The research results can provide a reference for the design of drilling parameters for hydrate reservoirs.

Keywords: nature gas hydrate; wellbore stability; well drilling; stability interface and wellbore reservoir coupling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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