【2017,1(3):135-147】Numerical simulations for analyzing deformation characte...

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Numerical simulations for analyzing deformation characteristics of hydrate-bearing sediments during depressurization

Lele Liu, Xiaobing Lu, Xuhui Zhang, Changling Liu, Bin Du

(Published: 2017-12-25)

Corresponding Author and Email: Lele Liu, liulele_leo@163.com

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Citation: Liu, L., Lu, X., Zhang, X., et al. Numerical simulations for analyzing deformation characteristics of hydrate-bearing sediments during depressurization. Adv. Geo-energ. Res. 2017, 1(3): 135-147, doi: 10.26804/ager.2017.03.01.

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Article Type: Original article

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Abstract:

Natural gas hydrates have been treated as a potential energy resource for decades. Understanding geomechanical

properties of hydrate-bearing porous media is an essential to protect the safety of individuals and devices during

hydrate production. In this work, a numerical simulator named GrapeFloater is developed to study the deformation

behavior of hydrate-bearing porous media during depressurization, and the numerical simulator couples multiple

processes such as conductive-convective heat transfer, two-phase fluid flow, intrinsic kinetics of hydrate

dissociation, and deformation of solid skeleton. Then, a depressurization experiment is carried out to validate the

numerical simulator. A parameter sensitivity analysis is performed to discuss the deformation behavior of

hydrate-bearing porous media as well as its effect on production responses. Conclusions are drawn as follows: the

numerical simulator named GrapeFloater predicts the experimental results well; the modulus of hydrate-bearing

porous media has an obvious effect on production responses; final deformation increases with decreasing outlet

pressure; both the depressurization and the modulus decrease during hydrate dissociation contribute to the

deformation of hydrate-bearing porous media.

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Keywords:Gas hydrate, hydrate-bearing sediment, geomechanics, depressurization, numerical simulation.

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      天然气水合物是一种重要的潜在替代能源，对其进行开采将削弱储层的安全性。本文通过数值模拟探讨了水合物降压开采储层变形规律，分析了变形模量、降压幅度和环境温度等因素的影响关系。获得的结论能够为水合物开采储层安全性评价提供参考。

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宁坤

天然气水合物是一种重要的潜在替代能源，对其进行开采将削弱储层的安全性。本文通过数值模拟探讨了水合物降压开采储层变形规律，分析了变形模量、降压幅度和环境温度等因素的影响关系。获得的结论能够为水合物开采储层安全性评价提供参考。