Field-Scale Simulation of Production from Oceanic Gas Hydrate Deposits
Field-Scale Simulation of Production from Oceanic Gas Hydrate Deposits
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DOI：
10.1007/s11242-014-0330-7
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发表时间：
2015-05-01
影响因子：
2.7
通讯作者：
Husebo, Jarle
中科院分区：
文献类型：
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作者：
Reagan, Matthew T.;Moridis, George J.;Husebo, Jarle
天然水合物中的碳氢化合物气体储量巨大，因此对其作为能源的潜力进行评价引起了人们极大的兴趣。已经表明，通过减压诱导的分解，并使用常规的水平井或垂直井配置，可以从某些类型的甲烷水合物聚集体中以高速率长时间容易地生产大量气体。然而，这些资源目前使用简化或缩小规模的3D或2D生产模拟进行评估。在这项研究中，我们使用大规模并行坚韧+HYDRATE代码（PT+H）来评估大型深海水合物储层的生产潜力，并制定有效生产的策略。该模拟对整个三维系统进行建模，检查垂直井和水平井、单井或多威尔斯的生产率，并探索储层特性的变化。系统高达2.5 M的网格块，运行在数千个超级计算节点，需要模拟这样的大型系统在最高层次的细节。模拟揭示了在具有广泛含水通道和与大型含水层连通的深层、相对寒冷的系统中进行生产所固有的挑战，主要是实现降压的困难和大量产水的问题。还强调了耦合流动，运输，热力学和相行为的大规模油藏模拟的新前沿，包括大网格的构建和较大系统的计算缩放。
The quantity of hydrocarbon gases trapped in natural hydrate accumulations is enormous, leading to a significant interest in the evaluation of their potential as an energy source. It has been shown that large volumes of gas can be readily produced at high rates for long times from some types of methane hydrate accumulations by means of depressurization-induced dissociation, and using conventional horizontal or vertical well configurations. However, these resources are currently assessed using simplified or reduced-scale 3D or 2D production simulations. In this study, we use the massively parallel TOUGH+HYDRATE code (pT+H) to assess the production potential of a large, deep ocean hydrate reservoir and develop strategies for effective production. The simulations model a full 3D system of over extent, examining the productivity of vertical and horizontal wells, single or multiple wells, and explore variations in reservoir properties. Systems of up to 2.5 M gridblocks, running on thousands of supercomputing nodes, are required to simulate such large systems at the highest level of detail. The simulations reveal the challenges inherent in producing from deep, relatively cold systems with extensive water-bearing channels and connectivity to large aquifers, mainly difficulty of achieving depressurization and the problem of enormous water production. Also highlighted are new frontiers in large-scale reservoir simulation of coupled flow, transport, thermodynamics, and phase behavior, including the construction of large meshes and the computational scaling of larger systems.