Nonequilibrium Modeling of Hydrate Dynamics in Reservoir
Nonequilibrium Modeling of Hydrate Dynamics in Reservoir
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DOI：
10.1021/ef300348r
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发表时间：
2012-05
期刊：
影响因子：
5.3
通讯作者：
M. Vafaei;B. Kvamme;Ashok Chejara;K. Jemai
中科院分区：
文献类型：
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作者：
M. Vafaei;B. Kvamme;Ashok Chejara;K. Jemai
储层中的天然气水合物一般不处于热力学平衡状态，可能存在多个水合物竞争相变。基于改进的水合物统计力学模型的水合物相变计算（Kvamme， B.; Tanaka， H. J. Phys）。化学，1995,99,7114-7119)用来说明由不同相形成的水合物性质的差异。更一般地说，多孔介质中的水合物是用吉布斯相规律来讨论的。本文认为，由于参考平衡要求的超规定体系的情况，涉及水合物的多孔介质相变很少能达到任何平衡状态。因此，提出了一种储层水合物非平衡描述策略。这涉及到所有可能的水合物形成和离解作为竞争性假反应的动力学表达式的公式。这涉及到水/二氧化碳界面上的水合物形成，从w…
Gas hydrates in reservoirs are generally not in thermodynamic equilibrium, and there may be several competing phase transitions involving hydrate. Calculations of hydrate phase transitions based on a modified statistical–mechanical model for hydrate (Kvamme, B.; Tanaka, H. J. Phys. Chem.1995, 99, 7114–7119) are used to illustrate differences in properties of hydrates formed from different phases. In more general terms, hydrates in porous media are discussed in terms of the Gibbs phase rule. It is argued that phase transitions involving hydrates in porous media can rarely reach any state of equilibrium due to situations of over specified systems with reference to requirements for equilibrium. As a consequence of this, a strategy for nonequilibrium description of hydrates in reservoirs is proposed. This involves the formulation of kinetic expressions for all possible hydrate formations and dissociations as competing pseudoreactions. This involves hydrate formation on a water/carbon dioxide interface, from w...