Simulation of microwave stimulation for the production of gas from methane hydrate sediment
Simulation of microwave stimulation for the production of gas from methane hydrate sediment
复制标题
微波刺激从甲烷水合物沉积物中生产天然气的模拟
DOI：
10.1016/j.apenergy.2016.01.091
复制
发表时间：
2016-04
期刊：
影响因子：
11.2
通讯作者：
Song Yongchen
中科院分区：
文献类型：
--
作者：
Zhao Jiafei;Fan Zhen;Wang Bin;Dong Hongsheng;Liu Yu;Song Yongchen
天然气水合物通过吸热过程解离。任何生产技术的关键要求之一是提供这种解离所必需的热量。本文首先建立了以质量输运、能量转换与守恒、本征动力学反应为控制方程的甲烷水合物沉积物产气微波刺激模型；此外，还引入了Lichtenecker和Rother的理论混合规则，用于计算含甲烷水合物沉积物的平均介电数据，这影响了微波对沉积物的穿透。接下来，进行模拟以研究产气量，以及微波刺激引起的初始含水饱和度、初始水合物饱和度和沉积物热性质的影响。此外，仿真中还采用了能效比。模拟结果表明，微波刺激提供了及时的能量转换，足以促进水合物的解离，具有快速、连续的产气效果。由于微波穿透深度的减小，库内出现了温度梯度，导致沉积物上部的解离速率较快。所有模拟的能效比在3.752到6.452之间。水合物饱和度和多孔介质比热容是影响能源效率的两个重要因素。水合物饱和度高，生气速率快，快速生气持续时间长，能源效率高。多孔介质的低比热容可以减少向沉积物散失的热量，提高产气率，提高能源效率。此外，高初始含水饱和度会导致微波穿透深度的快速下降，并导致沉积物中的温度梯度较大。多孔介质的热导率主要影响水合物解离后期的产气。沉积物的宏观热传导降低了储层的温度梯度，促进了水合物的均相解离。
Natural gas hydrates dissociate via an endothermic process. One of the key requirements for any production technique is to supply the heat necessary for this dissociation. In this study, first, a microwave stimulation model for the production of gas from methane hydrate sediment is developed, which includes mass transport, energy conversion and conservation, and intrinsic kinetic reactions as the governing equations. In addition, the theoretical mixing rule of Lichtenecker and Rother is introduced for calculating the average dielectric data of the sediment containing methane hydrates, which affects the penetration of microwaves into the sediment. Next, simulations are performed for investigating gas production, as well as effects of initial water saturation, initial hydrate saturation, and sediment thermal properties induced by microwave stimulation. Moreover, the energy efficiency ratio is employed in the simulation. The simulation results show that microwave stimulation provides timely energy conversion sufficient for promoting the dissociation of hydrates, with rapid, continuous gas production. Temperature gradients caused by the decrease of the microwave penetration depth appear in the reservoir, leading to a rapid dissociation rate in the upper part of the sediment. The energy efficiency ratio for all simulations ranges between 3.752 and 6.452. Hydrate saturation and the specific heat capacity of porous media are two factors that significantly affect energy efficiency. High hydrate saturation contributes to a rapid gas generation rate and a long rapid gas generation lasting time, leading to a high energy efficiency. A low specific heat capacity of porous media can decrease the loss of heat to the sediment, increase the gas generation rate, and improve energy efficiency. Furthermore, high initial water saturation can cause a rapid decrease in the microwave penetration depth and lead to large temperature gradients in the sediment. The thermal conductivity of porous media mainly affects gas generation in the latter period of hydrate dissociation. Macroscopic heat conduction in the sediment decreases the temperature gradients in the reservoir and promotes homogeneous hydrate dissociation.
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DOI：
10.1016/j.ijheatmasstransfer.2015.08.102
发表时间：
2016
影响因子：
5.2
作者：
Yongchen Song;Jiaqi Wang;Yu Liu;Jiafei Zhao
通讯作者：
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