Interactions at the interfaces of the H2-brine-cement systems at elevated pressures for H2 storage

被引:1
|
作者
Villablanca-Ahues, R. [1 ]
Nagl, N. [2 ]
Zeiner, T. [2 ]
Jaeger, P.
机构
[1] Tech Univ Clausthal, Inst Subsurface Energy Syst, Clausthal Zellerfeld, Germany
[2] Graz Univ Technol, Proc Syst Engn, Graz, Austria
关键词
Underground hydrogen storage; Interfacial tension; Contact angle; DGT; PC-SAFT; EQUATION-OF-STATE; DENSITY GRADIENT THEORY; ASSOCIATING FLUID THEORY; VAPOR-LIQUID INTERFACE; PERTURBED-CHAIN SAFT; PLUS CARBON-DIOXIDE; LOW-ENERGY SOLIDS; MOLECULAR SIMULATION; PHASE-EQUILIBRIUM; SURFACE-PROPERTIES;
D O I
10.1016/j.colsurfa.2024.134091
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
There is a global demand on assessment of potential subsurface gas storage sites in view of safely injecting hydrogen or carbon dioxide. One relevant aspect that has already been subject to thorough investigation is the mutual interaction of all participating compounds in terms of the wetting behaviour that on its turn is directly related to the predominating capture mechanisms. Given the diversity of the geophysical and geochemical circumstances, transferability of results from work conducted on one geological site to another location is limited. For instance, there is a large number of publications on wettability of many different rock types in hydrogen atmosphere that are partly controversal and strictly applicable only to the respective reported system. Hence, there is a gap in finding general model approaches that serve for a holistic understanding of predominating mechanisms and building the fundamentals for predicting the behaviour of systems that have not been studied so far. The presented work addresses this gap by quantifying mutual interactions of the participating phases in a solid-liquid-gas systems and determining the respective interfacial tensions, gamma SV (solid-vapor), gamma LV, (liquid-vapor) and gamma SL (solid-liquid). Neumann and Good demonstrated how to determine the solid-fluid interfacial tension based on the contact angle and the liquid-gas interfacial tension by calculating a so-called molecular interaction parameter. Up to date, this method has been applied, among others, for systems containing CO2 and solids such a teflon, glass, and steel. The methodology could be confirmed by testing systems comprising steel - H2O - CH4 /H2 and comparing the results to the aforementioned literature data. As one of the critical parts in H2 underground storage, the completion system containing a common well cement, H2 and brine was subject to this work. The interfacial tension between H2 and brine as well as the contact angle between the fluid phases and the cement were investigated experimentally up to 20 MPa, temperatures from 313.15 to 353.15 K and NaCl - concentrations of up to 10% wt. As a theoretical approach, the interfacial tension of the system H2O+H2 was investigated using the density gradient theory (DGT) in combination with the perturbed chain statistical associating fluid theory equation of state (PC-SAFT). Finally, the H2cement interfacial tension is determined through the calculation of a so-called molecular interaction parameter. The interfacial tension data of H2O+H2 experimentally and theoretically determined in this work agree among each other as well as with previous literature data. Likewise, agreement was found between the brine+H2 interfacial tension and previous studies. The contact angle appears to be influenced mostly by pressure, producing a less H2O/brine-wet system as pressure increases. The H2-cement interfacial tension decreases from approximately 150 mN/m down to 100 mN/m, as the pressure increases from 0.1 to 20 MPa. The presented data suggest H2 to be slightly adsorbed on the one hand but the capillary entry pressure to decrease on the other, causing concerns regarding the integrity of the completion system.
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页数:19
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