Analysis of heat transfer influences on gas production from methane hydrates using a combined method
Analysis of heat transfer influences on gas production from methane hydrates using a combined method
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DOI：
10.1016/j.ijheatmasstransfer.2015.08.102
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发表时间：
2016
影响因子：
5.2
通讯作者：
Yongchen Song;Jiaqi Wang;Yu Liu;Jiafei Zhao
中科院分区：
文献类型：
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作者：
Yongchen Song;Jiaqi Wang;Yu Liu;Jiafei Zhao
热传递影响水合物沉积物的压力和温度分布，从而控制水合物的分解。因此，对其进行研究对规划水合物开发具有重要意义。以前，一个二维轴对称模型被开发和验证，以研究热传递对含水合物沉积物中水合物开采的影响。在这里，我们利用降压和热刺激相结合的方法，将研究范围扩展到换热对甲烷气产气的影响。模拟结果表明，在组合分解过程中，含水合物的多孔介质的高比热容或高初始水含量会抑制气体的生成。而初始含水率对累积产气量和产气量的影响较小。水和甲烷热对流的影响也很小。导热系数的增加最初抑制了水合物的解离，但后来促进了水合物的解离。与仅使用热刺激相比，联合采气方法的实施增加了产气量。然而，随着热注入温度的升高，这些好处逐渐减少。
Heat transfer affects the pressure and temperature distributions of hydrate sediments, thereby controlling hydrate dissociation. Therefore, its study is essential for planning hydrate exploitation. Previously, a two-dimensional axisymmetric model, to investigate the influence of heat transfer on hydrate exploitation from hydrate-bearing sediments, was developed and verified. Here, we extended our investigation to the influence of heat transfer on methane gas production using a combined method coupling depressurization and thermal stimulation. Our simulations showed that during decomposition by the combined method, a high specific heat capacity of the hydrate-bearing porous media or a high initial water content could inhibit gas generation. However, the initial water content had only a weak influence on the cumulative gas production and generation rate. The influence of water and methane heat convection was also weak. An increase of the thermal conductivity initially inhibited hydrate dissociation but later promoted it. The implementation of the combined method increased gas generation compared with using only thermal stimulation. However, the benefits gradually diminished with an increasing heat injection temperature.