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Stability Analysis of Near-Wellbore Reservoirs Considering the Damage of Hydrate-Bearing Sediments

1
The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
2
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(4), 102; https://doi.org/10.3390/jmse7040102
Received: 4 March 2019 / Revised: 31 March 2019 / Accepted: 9 April 2019 / Published: 13 April 2019
(This article belongs to the Special Issue Coastal Geohazard and Offshore Geotechnics)
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Abstract

The stability of hydrate-bearing near-wellbore reservoirs is one of the key issues in gas hydrate exploitation. In most previous investigations, the damage evolution process of the sediment structure and its effect on near-wellbore reservoir stability have been neglected. Therefore, the damage variable is introduced into a multi-field coupled model based on continuous damage theory and multi-field coupling theory. A thermo-hydro-mechanical-chemical (THMC) multi-field coupling mathematical model considering damage of hydrate-bearing sediments is established. The effects of damage of hydrate-bearing sediments on the thermal field, seepage field, and mechanical field are considered. Finally, the distributions of hydrate saturation, pore pressure, damage variable, and effective stress of a near-wellbore reservoir in gas hydrate exploitation by depressurization are calculated, and the stability of a hydrate-bearing near-wellbore reservoir is analyzed using the model. Through calculation and analysis, it is found that structural damage of hydrate-bearing sediments has an adverse effect on the stability of hydrate-bearing near-wellbore reservoirs. The closer to the wellbore, the worse the reservoir stability, and the near-wellbore reservoir stability is the worst in the direction of minimum horizontal ground stress. View Full-Text
Keywords: hydrate-bearing sediments; damage statistical constitutive model; multi-field coupling; wellbore stability hydrate-bearing sediments; damage statistical constitutive model; multi-field coupling; wellbore stability
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Zhang, X.; Xia, F.; Xu, C.; Han, Y. Stability Analysis of Near-Wellbore Reservoirs Considering the Damage of Hydrate-Bearing Sediments. J. Mar. Sci. Eng. 2019, 7, 102.

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