Impact of pressure and temperature on CO2-brine-mica contact angles and CO2-brine interfacial tension: Implications for carbon geo-sequestration
Impact of pressure and temperature on CO2-brine-mica contact angles and CO2-brine interfacial tension: Implications for carbon geo-sequestration
复制标题
DOI：
10.1016/j.jcis.2015.09.076
复制
发表时间：
2016-01-15
影响因子：
9.9
通讯作者：
Iglauer, Stefan
中科院分区：
文献类型：
--
作者：
Arif, Muhammad;Al-Yaseri, Ahmed Z.;Iglauer, Stefan
CO2-盐水-岩石系统的润湿性和CO2-盐水界面张力在储层条件下的精确表征是必不可少的，因为它们影响盖层的毛细管密封效率，这反过来又影响CO2地质封存过程中的结构和残留捕获。在此背景下，我们实验测量了盐水-CO2-云母体系的前进和后退接触角（表面粗糙度类似于12 nm）lMPa、5 MPa、7 MPa、10 MPa、15 MPa、20 MPa）、温度（308 K、323 K和343 K）和盐度（0重量%、5重量%、10重量%、20重量%和30重量% NaCl）。对于相同的实验基质，CO2-盐水界面张力也已使用悬滴技术测量。结果表明，前进和后退接触角均随压力和盐度的增加而增大，随温度的升高而减小。相反，CO2-盐水界面张力随压力的升高而降低，随温度的升高而升高。在20 MPa和308 K下，测量的前进角为110，表明CO2润湿。结果与各种已发表的文献数据进行了比较，并强调了导致偏差的可能因素。最后，我们证明了测量数据的影响，通过评估CO2存储高度在各种操作条件下。我们的结论是，对于一个给定的存储深度，具有较低的压力和高温的储层可以存储更大的体积，从而表现出更好的密封效率。(C)2015 Elsevier Inc. All rights reserved.
Precise characterization of wettability of CO2-brine-rock system and CO2-brine interfacial tension at reservoir conditions is essential as they influence capillary sealing efficiency of caprocks, which in turn, impacts the structural and residual trapping during CO2 geo-sequestration. In this context, we have experimentally measured advancing and receding contact angles for brine-CO2-mica system (surface roughness similar to 12 nm) at different pressures (0.1 MPa, 5 MPa, 7 MPa, 10 MPa, 15 MPa, 20 MPa), temperatures (308 K, 323 K, and 343 K), and salinities (0 wt%, 5 wt%, 10 wt%, 20 wt% and 30 wt% NaCl). For the same experimental matrix, CO2-brine interfacial tensions have also been measured using the pendant drop technique. The results indicate that both advancing and receding contact angles increase with pressure and salinity, but decrease with temperature. On the contrary, CO2-brine interfacial tension decrease with pressure and increase with temperature. At 20 MPa and 308 K, the advancing angle is measured to be 110, indicating CO2-wetting. The results have been compared with various published literature data and probable factors responsible for deviations have been highlighted. Finally we demonstrate the implications of measured data by evaluating CO2 storage heights under various operating conditions. We conclude that for a given storage depth, reservoirs with lower pressures and high temperatures can store larger volumes and thus exhibit better sealing efficiency. (C) 2015 Elsevier Inc. All rights reserved.