Numerical simulation on the evolution of physical and mechanical characteristics of natural gas hydrate reservoir during depressurization production

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Numerical simulation on the evolution of physical and mechanical characteristics of natural gas hydrate reservoir during depressurization productionYujing Jiang a b c, Xianzhuang Ma a b, [size=1em]Hengjie Luan a b, Wei Liang d, Peng Yan a b, Weiqiang Song a b, Qinglin Shan a baState Key Laboratory of Mining Disaster Prevention and Control Co-Founded By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, ChinabCollege of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, ChinacGraduate School of Engineering, Nagasaki University, Nagasaki, 852-8521, JapandState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

Received 14 March 2022, Revised 26 July 2022, Accepted 28 September 2022, Available online 13 October 2022, Version of Record 17 October 2022.
AbstractChanges in the physical and mechanical characteristics of the natural gas hydrate reservoir during depressurization production can affect safe and efficient production. In order to reveal the evolution law of reservoir physical and mechanical characteristics, based on the establishment of thermo-hydro-mechanical-chemical (THMC) multi-field coupling theoretical model, taking SH2 drilling platform in Shenhu sea area of the South China Sea as an example, COMSOL multiphysics is used to simulate the processes of depressurization production with a single horizontal well. The results show that, after the bottom hole pressure began to decrease, the gas and water production rates immediately increased from zero to their respective peaks, and then decreased rapidly. The decomposition of hydrate is an endothermic process. The changes of temperature and pressure conditions have a significant impact on the decomposition of hydrate. Effective stress and Mises stress appear to be concentrated in the area of complete hydrate decomposition. Mises stress rises sharply at the location of the leading edge of decomposition, which needs to be alert to the risk of landslide. In the process of depressurization production, the top of the reservoir gradually appears settlement behavior. The upper area of the horizontal well has a large amount of subsidence, and reservoir modification can be implemented during production to improve the mechanical stability of the reservoir. The results are an important guide to achieve stable and continuous gas production.

KeywordsNatural gas hydrate
; Depressurization production
; Numerical simulation
; Multi-field coupling
; Physical and mechanical characteristics

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