Pore‐Scale Observations of Hydrogen Trapping and Migration in Porous Rock: Demonstrating the Effect of Ostwald Ripening
Pore‐Scale Observations of Hydrogen Trapping and Migration in Porous Rock: Demonstrating the Effect of Ostwald Ripening
复制标题
多孔岩石中氢捕获和迁移的孔隙尺度观测：证明奥斯特瓦尔德成熟效应
DOI：
--
复制
发表时间：
2023
影响因子：
5.2
通讯作者：
M. Blunt
中科院分区：
文献类型：
--
作者：
Yihuai Zhang;B. Bijeljic;Ying Gao;Sepideh Goodarzi;S. Foroughi;M. Blunt
利用高分辨率三维X射线成像技术，研究了Bentheimer砂岩孔隙空间中的氢气注入和提取。结果与氮重复试验结果进行了比较。我们观察到较少的氢捕获，因为排水后的初始饱和度由于通道而降低。值得注意的是，我们观察到，在吸胀之后，如果在12小时后再次对样品进行成像，则捕获的氢有明显的重排。许多较小的神经节消失，而较大的神经节肿胀，总体气量没有可检测到的变化。对于氮气，流体结构基本不变。水相中溶解气体的浓度梯度促进了这种重排，我们估计这种影响的时间尺度是显著的，与实验观察一致。较大神经节的肿胀可能会增加气体连接，导致更少的滞后和更有效的提取。
We use high‐resolution three‐dimensional X‐ray imaging to study hydrogen injection and withdrawal in the pore space of Bentheimer sandstone. The results are compared with a replicate experiment using nitrogen. We observe less trapping with hydrogen because the initial saturation after drainage is lower due to channeling. Remarkably we observe that after imbibition, if the sample is imaged again after 12 hr, there is a significant rearrangement of the trapped hydrogen. Many smaller ganglia disappear while the larger ganglia swell, with no detectable change in overall gas volume. For nitrogen, the fluid configuration is largely unchanged. This rearrangement is facilitated by concentration gradients of dissolved gas in the aqueous phase—Ostwald ripening, We estimate the time‐scales for this effect to be significant, consistent with the experimental observations. The swelling of larger ganglia potentially increases the gas connectivity, leading to less hysteresis and more efficient withdrawal.
影响因子：
2.3
作者：
Parnell J;Blamey N
通讯作者：
Blamey N
奥斯特瓦尔德成熟和重力平衡：对长期地下天然气储存的影响。
DOI：
10.1103/physreve.106.045103
发表时间：
2022
期刊：
Physical review. E
影响因子：
--
作者：
Blunt MJ
通讯作者：
Blunt MJ