Hydrate formation characteristics during carbon dioxide flow through depleted methane hydrate deposits
Hydrate formation characteristics during carbon dioxide flow through depleted methane hydrate deposits
复制标题
二氧化碳流经贫化甲烷水合物沉积物期间水合物形成特征
DOI：
10.1002/ente.201700773
复制
发表时间：
2018
影响因子：
3.8
通讯作者：
Li Yuanping
中科院分区：
文献类型：
--
作者：
Wang Pengfei;Zhou Hang;Ling Zheng;Li Yuanping
枯竭型甲烷水合物储层是潜在的CO2封存场所。模拟了MH分解样品中CO2流动过程中水合物的形成，以阐明CO2水合物的形成特征及其对CO2储存的影响。实验包括MH形成和解离、CO2注入、水注入和CO2水合物解离以及通过磁共振成像（MRI）监测的液态水分布。结果表明，初始含水饱和度决定了人工沉积物中水合物的饱和度，降压幅度是影响过量气样MH分解的主要因素。压力是影响CO2流动过程中水合物生成的关键因素。CO2流量的增加导致水合物饱和度和注入CO2转化率的降低。累积注入水量不是控制CO2水合物生成的关键因素，但决定了剩余水饱和度。
Depleted methane hydrate (MH) reservoirs are potential sites for CO2storage. Hydrate formation during the CO2flow process in a dissociated MH sample was simulated to clarify the formation characteristics of CO2hydrates and their effect on CO2storage. Experiments included MH formation and dissociation, CO2injection, water‐injection and CO2hydrate dissociation, and liquid‐water distribution as monitored by magnetic resonance imaging (MRI). It was observed that the initial water saturation determined the hydrate saturation in the artificial sediment, and the depressurization range was the main factor influencing MH dissociation for the excess gas sample. Pressure is the key factor influencing hydrate formation during CO2flow. An increase of the CO2flow rate led to a decrease of both hydrate saturation and conversion of the injected CO2. The cumulative amount of injected water is not the key factor controlling CO2hydrate formation, but it does determine the residual water saturation.