Pore-scale visualization of hydrogen storage in a sandstone at subsurface pressure and temperature conditions: Trapping, dissolution and wettability.
Pore-scale visualization of hydrogen storage in a sandstone at subsurface pressure and temperature conditions: Trapping, dissolution and wettability.
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DOI：
10.1016/j.jcis.2022.09.082
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发表时间：
2022-07
影响因子：
9.9
通讯作者：
Z. Jangda;H. Menke;A. Busch;S. Geiger;T. Bultreys;Helen Lewis;Kamaljit Singh Institute of GeoEnergy Engineering;Heriot-Watt University;Department of Geoscience;Engineering;Delft University of Technology;3UGCTPProGRess;D. Geology;Ghent University
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作者：
Z. Jangda;H. Menke;A. Busch;S. Geiger;T. Bultreys;Helen Lewis;Kamaljit Singh Institute of GeoEnergy Engineering;Heriot-Watt University;Department of Geoscience;Engineering;Delft University of Technology;3UGCTPProGRess;D. Geology;Ghent University
地下氢（H2）储存是大规模循环H2storage的潜在可行方案；然而，人们对H2at在地下压力和温度条件下的行为知之甚少。这项工作研究了多孔砂岩中h2 -盐水体系的孔隙尺度驱替过程是否可以充分定义，以实现有效和经济的存储操作。该研究特别研究了h2 -盐水体系在孔隙尺度下的捕获、溶解和润湿性，并对地下储氢条件进行了研究。实验我们在流动实验中进行了情境x射线成像，以研究在具有地下储层代表性的温度和压力条件下，盐水饱和Bentheimer砂岩样品在注氢和驱替过程中的孔隙尺度过程。采用两种注入方案进行渗吸：用h2平衡盐水和非h2平衡盐水驱替h2。对两个循环的结果进行了比较。结果发现，两次驱替循环后，砂岩对卤水均为润湿性，对h22不润湿，h2平衡盐水和非h2平衡盐水的平均接触角分别为54°和53°。我们还发现，与H2-平衡盐水相比，非H2-平衡盐水的H2回收率（31.6%）更高（43.1%），这表明在储层条件下，非H2-平衡盐水可能溶解H2。我们的研究结果表明，地下储氢可能确实是一种合适的储能策略，但要充分了解储层条件下孔隙尺度的相互作用，还需要大量的进一步研究。
HypothesisUnderground hydrogen (H2) storage is a potentially viable solution for large-scale cyclic H2storage; however, the behavior of H2at subsurface pressure and temperature conditions is poorly known. This work investigates if the pore-scale displacement processes in H2-brine systems in a porous sandstone can be sufficiently well defined to enable effective and economic storage operations. In particular, this study investigates trapping, dissolution, and wettability of H2-brine systems at the pore-scale, at conditions that are realistic for subsurface H2storage.ExperimentsWe have performedin situX-ray imaging during a flow experiment to investigate pore-scale processes during H2injection and displacement in a brine saturated Bentheimer sandstone sample at temperature and pressure conditions representative of underground reservoirs. Two injection schemes were followed for imbibition: displacement of H2with H2-equilibrated brine and with non-H2-equilibrated brine. The results from the two cycles were compared with each other.FindingsThe sandstone was found to be wetting to the brine and non-wetting to H2after both displacement cycles, with average contact angles of 54° and 53° for H2-equilibrated and non-H2-equilibrated brine respectively. We also found a higher recovery of H2(43.1%) when displaced with non-H2-equilibrated brine compared to that of H2-equilibrated brine (31.6%), indicating potential dissolution of H2in the unequilibrated imbibing brine at reservoir conditions. Our results suggest that underground H2storage may indeed be a suitable strategy for energy storage, but considerable further research is needed to fully comprehend the pore-scale interactions at reservoir conditions.