Gas Production from Methane Hydrate: A Laboratory Simulation of the Multistage Depressurization Test in Mallik, Northwest Territories, Canada
Gas Production from Methane Hydrate: A Laboratory Simulation of the Multistage Depressurization Test in Mallik, Northwest Territories, Canada
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DOI：
10.1021/acs.energyfuels.6b00297
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发表时间：
2016-08-01
期刊：
影响因子：
5.3
通讯作者：
Schicks, Judith M.
中科院分区：
文献类型：
--
作者：
Heeschen, Katja U.;Abendroth, Sven;Schicks, Judith M.
天然气水合物生产仍处于试验阶段。直到现在，才开发出数字模型来描述数据和生产情景。进行实验室实验，以测试的概念模型的基本原理，并提供输入数据。主要的实验挑战包括：（I）模拟天然的具有已知和高水合物饱和度的砂-水合物-液体三相系统;（II）模拟从现场数据推导出的输运行为。GFZ的大规模储层模拟器（LARS; 210 L样品）已经满足了这些挑战，并允许通过多级降压首次模拟Mallik钻井现场（加拿大）的永久冻土水合物天然气生产测试。在起始位置，水合物饱和度高达90%，仅由溶解的甲烷形成。而天然气水合物的分解决定了在早期压力阶段的流动模式，不同的运输行为的重要性增加，在较低的压力阶段和增加的水含量。记录在Mallik中观察到的气流模式。虽然实验数据的概念模型与Mallik在中等和低产气量下提出的模型一致，但在高产气量下则不同。
Gas hydrate production is still in the test phase. It is only now that numerical models are being developed to describe data and production scenarios. Laboratory experiments are carried out to test the rationale of the conceptual models and deliver input data. Major experimental challenges include (I) the simulation of a natural three-phase system of sand-hydrate-liquid with known and high hydrate saturations and (II) the simulation of transport behavior as deduced from field data. The large-scale reservoir simulator (LARS; 210 L sample) at the GFZ has met these challenges and allowed for the first simulation of the gas production test from permafrost hydrates at the Mallik drill site (Canada) via multistage depressurization. At the starting position, hydrate saturation was as high as 90%, formed from dissolved methane only. Whereas gas hydrate dissociation determined the flow patterns in the early pressure stages, the importance of different transport behaviors increased at lower pressure stages and increasing water content. Gas flow patterns as observed in Mallik were recorded. While the conceptual model for the experimental data does agree with the model proposed for Mallik at moderate and low gas production, it is different at high gas production rates.