| CO_2注入下岩层变形和流体运移分析(I):两相流-岩层耦合模型 |
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| 引用本文： | 张 帆,周 辉,吕 涛,胡大伟,盛 谦,胡其志.CO_2注入下岩层变形和流体运移分析(I):两相流-岩层耦合模型[J].岩土力学,2014,35(9):2549-2554. |
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| 作者姓名： | 张 帆 周 辉 吕 涛 胡大伟 盛 谦 胡其志 |
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| 作者单位： | 1.湖北工业大学 土木工程与建筑学院，武汉 430068；2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室， 武汉 430071；3. 中国核电工程有限公司，北京 100840 |
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| 基金项目： | 国家自然科学基金资助项目（No. 51009132, No. 51209085）；岩土力学与工程国家重点实验室资助课题（No. Z013007）。 |
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| 摘 要： | 目前国内关于CO2咸水层封存尚处于先导性和试验性研究阶段,对超临界CO2注入过程中岩层力学响应和流体运移的理论与技术方面的认识还不完善。为研究CO2注入下岩层变形和流体运移,基于两相流动数学模型,给出了超临界CO2和咸水质量守恒方程;采用毛细压力和有效饱和度的关系式,将质量守恒方程变换成以毛细压力为变量的表达式,以便于考虑流体压力对岩层的影响。提出了无流体压力影响下的岩层力学本构模型,该模型能够同时考虑岩层的塑性变形和损伤。分析了两相流体-岩层相互作用机制:一方面,采用有效应力原理,考虑流体压力对岩层的力学影响;另一方面,通过岩层固有渗透率变化考虑岩层变形对流体运移的影响。
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| 关 键 词： | CO2咸水层封存 两相流 弹塑性 损伤 有效应力 渗透率 流-固耦合 |
| 收稿时间： | 2013-05-15 |
Analysis of reservoir deformation and fluid transportation induced by injection of CO2 into saline aquifer: (I) Two-phase flow-reservoir coupling model |
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| ZHANG Fan,ZHOU Hui,LU Tao,HU Da-wei,SHENG Qian,HU Qi-zhi.Analysis of reservoir deformation and fluid transportation induced by injection of CO2 into saline aquifer: (I) Two-phase flow-reservoir coupling model[J].Rock and Soil Mechanics,2014,35(9):2549-2554. |
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| Authors: | ZHANG Fan ZHOU Hui LU Tao HU Da-wei SHENG Qian HU Qi-zhi |
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| Institution: | 1. School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan 430068, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. China Nuclear Power Engineering Co., Ltd., Beijing 100840, China |
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| Abstract: | Deep underground injection of carbon dioxide (CO2) into saline reservoir in China is in the stage of pilot project and field validation.The mechanical response of reservoir and fluid transportation induced by injection of supercritical CO2 are imperfect in theory and technology. In order to study the reservoir deformation and fluid transportation, the mass balance equations for both supercritical CO2 and saline are firstly presented based on two-phase flow model. The capillary pressure is introduced and served as the argument in the mass balance equations after some equation manipulations, with the help of relation between capillary pressure and saturation degree, which can facilitate consideration of the influence of fluid pressure on the reservoir formation. Secondly, a constitutive model is proposed to describe the mechanical behavior of dry rock of reservoir formation without fluid pressure, both the plastic deformation and damage mechanism can be considered. The coupling mechanism of fluid and reservoir formation is analyzed; the effective stress concept is used to consider the effect of fluid pressure on the reservoir formation, while the influence of reservoir deformation on fluid transportation is described by the variation of permeability of reservoir formation. |
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| Keywords: | CO2 storage in saline aquifer two-phase flow elastoplastic damage effective stress permeability hydro-mechanical coupling |
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