Effects of salt concentrations and pore surface structure on the water flow through rock nanopores

Yin Yu-Ming; Zhao Ling-Ling

doi:10.7498/aps.69.20191742

Abstract

The surface dissolution of rock nanopores, caused by the acidic environment, increases the salt concentration of water solution flowing in the nanopores, thereby destroying the surface structure of the rock, which can be found in CO₂ geological sequestration and crude oil and shale gas exploration. In this paper, the molecular dynamics method is adopted to study the flow characteristics of water solution in the forsterite (Mg₂SiO₄) slit nanopores, by which the effects of salt concentration and structure destruction of pore surface on the velocity profiles of water solution confined in nanopores are systematically analyzed. The hydrogen bond density, radial distribution function (RDF) and water density distribution are calculated to explain the changes in viscosity, velocity profiles and interaction between water and nanopore surface. The results show that as the salt concentration increases, the water solution flow in the rock nanopore obeys the Hagen-Poiseuille equation, and the velocity profiles of water solution remain parabolic shape. However, the hydrogen bond network among water molecules becomes denser with salt concentration increasing, which can account for the linear increase in the viscosity of water solution. Besides, the higher salt concentration gives rise to the larger water flow resistance from the pore surface. As a result, with the salt concentration increasing, the maximum of water velocity decreases and the curvature radius of the parabolic velocity profile curve becomes bigger. Moreover, the surface structure destruction in rock nanopores changes the roughness of surface in the flow channel, which enhances the attraction of nanopore surface to H₂O. As the structure destruction of nanopore surface deteriorates, the water density near the rough surface moves upward, whereas the velocity of water near the rough surface declines obviously. Interestingly, when the degree of surface structure destruction reaches 50%, a significant negative boundary slipping near the rough surface appears.

Keywords:

Authors and contacts

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy & Environment, Southeast University, Nanjing 210096, China

Corresponding author: Zhao Ling-Ling, zhao_lingling@seu.edu.cn

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References

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Cited By

图 1 纳米级镁橄榄石孔隙内水溶液流动的模拟系统图

Figure 1. The simulation system of water solution flow in the forsterite nanopore.

DownLoad: Full-Size Img PowerPoint

图 2 Mg₂SiO₄晶体拉伸的分子模拟应力-应变曲线

Figure 2. The stress-strain curves of the Mg₂SiO₄ crystal stretching obtained using molecular dynamics simulation.

DownLoad: Full-Size Img PowerPoint

图 3 (a)纯水和MgCl₂含盐水中以0.32 nm半径的水合壳结构示意图; (b)不同MgCl₂浓度下纳米级镁橄榄石孔隙内纯水和含盐水的+Z向速度分布

Figure 3. (a) Snapshots for the solvation shell with a radius of 0.4 nm in pure water and MgCl₂ solution, (b) the velocity profiles in the +Z direction of water solution in the forsterite nanopore with different MgCl₂ concentrations.

DownLoad: Full-Size Img PowerPoint

图 4 (a)不同MgCl₂浓度含盐水的黏度及其内部氢键密度; (b)不同MgCl₂浓度含盐水O_w-O_w原子对的径向分布函数

Figure 4. (a) The viscosity and hydrogen bond density of water solution with different MgCl₂ concentrations; (b) the radial distribution function of O_w-O_w near the wall of nanopores.

DownLoad: Full-Size Img PowerPoint

图 5 Mg-O_w原子对的径向分布函数

Figure 5. The radial distribution function of Mg-O_w near the wall of nanopores.

DownLoad: Full-Size Img PowerPoint

图 6 不同表面结构破坏程度的纳米级镁橄榄石孔隙示意图

Figure 6. The schematic of forsterite nanopores with various degrees of surface structure destruction.

DownLoad: Full-Size Img PowerPoint

图 7 不同表面结构破坏程度下纳米级镁橄榄石孔隙内水的+Z向速度分布

Figure 7. The velocity profiles in the +Z direction of water solution in forsterite nanopores with various degrees of surface structure destruction.

DownLoad: Full-Size Img PowerPoint

图 8 不同表面结构破坏程度下纳米级镁橄榄石孔隙内水溶液的密度分布

Figure 8. The density profiles of water solution in forsterite nanopores with various degrees of surface structure destruction.

DownLoad: Full-Size Img PowerPoint

[1]	Schrag D P J 2007 Science 315 812 Google Scholar
[2]	Liu B, Qi C, Zhao X, Teng G, Zhao L, Zheng H, Zhan K, Shi J 2018 J. Phys. Chem. C 122 26671 Google Scholar
[3]	Cunningham A B, Gerlach R, Spangler L, Mitchell A C 2009 Energy Procedia. 1 3245 Google Scholar
[4]	Pournik M, Nasr-El-Din H A, Mahmoud M A 2011 SPE Prod. Oper. 26 18
[5]	Li Z, Xu Y, Yang L, Guo J, Chen J J 2016 Aust. J. Earth. Sci. 63 503 Google Scholar
[6]	Black J R, Carroll S A, Haese R R 2015 Chem. Geol. 399 134 Google Scholar
[7]	黄桥高, 潘光, 宋保维 2014 物理学报 63 054701 Google Scholar Huang Q G, Pan G, Song B W 2014 Acta Phys. Sin. 63 054701 Google Scholar
[8]	葛宋, 陈民 2013 工程热物理学报 34 1527 Ge S, Chen M 2013 J. Eng. Therm. 34 1527
[9]	杨峰, 宁正福, 胡昌蓬, 王波, 彭凯, 刘慧卿 2013 石油学报 34 301 Google Scholar Yang F, Ning Z F, Hu C P, Wang B, Peng K, Liu H Q 2013 Acta Petrol. Sin. 34 301 Google Scholar
[10]	Eijkel J C, Van Den Berg A J M 2005 Microfluid. Nanofluid. 1 249 Google Scholar
[11]	Karniadakis G, Beskok A, Aluru N 2006 Microflows and Nanoflows: Fundamentals and Simulation (Vol. 29) (Berlin: Springer Science & Business Media) pp13–15
[12]	Wang S, Javadpour F, Feng Q H 2016 Fuel. 181 741 Google Scholar
[13]	Ho T A, Striolo A 2015 AIChE J. 61 2993 Google Scholar
[14]	Marcus Y J 2009 Chem. Rev. 109 1346 Google Scholar
[15]	Ma J, Li K, Li Z, Qiu Y, Si W, Ge Y, Sha J, Liu L, Xie X, Yi H 2019 J. Am. Chem. Soc. 141 4264 Google Scholar
[16]	van der Vegt N F, Haldrup K, Roke S, Zheng J, Lund M, Bakker H 2016 Chem. Rev. 116 7626 Google Scholar
[17]	Aryal D, Ganesan V 2018 ACS Macro Lett. 7 739 Google Scholar
[18]	杨倩 2018 博士学位论文 (成都: 西南交通大学) Yang Q 2018 Ph. D. Dissertation (Chengdu: Southwest Jiaotong University) (in Chinese)
[19]	张烨, 张冉, 常青, 李烨 2019 物理学报 68 124702 Google Scholar Zhang Y, Zhang R, Chang Q, Li H, 2019 Acta Phys. Sin. 68 124702 Google Scholar
[20]	Rahmatipour H, Azimian A-R, Atlaschian O 2017 Physica A 465 159 Google Scholar
[21]	梅涛, 陈独秀, 杨历, 王坤, 苗瑞灿 2019 物理学报 68 094701 Google Scholar Mei T, Chen D X, Yang L, Wang K, Miao C C, 2019 Acta Phys. Sin. 68 094701 Google Scholar
[22]	南怡伶, 孔宪, 李继鹏, 卢滇楠 2017 化工学报 68 1786 Nan Y L, Kong X, Li J P, Lu D N 2017 J. Chem. Ind. Eng. (China) 68 1786
[23]	王胜, 徐进良, 张龙艳 2017 物理学报 66 204704 Google Scholar Wang S, Xu J L, Zhang L Y 2017 Acta Phys. Sin. 66 204704 Google Scholar
[24]	张冉, 谢文佳, 常青 2018 物理学报 67 084701 Google Scholar Zhang R, Xie W J, Chang Q 2018 Acta Phys. Sin. 67 084701 Google Scholar
[25]	Markesteijn A, Hartkamp R, Luding S, Westerweel J 2012 J. Chem. Phys 136 134104 Google Scholar
[26]	Yoshida H, Bocquet L 2016 J. Chem. Phys 144 234701 Google Scholar
[27]	Xu J, Zhu C, Wang Y, Li H, Huang Y, Shen Y, Francisco J S, Zeng X C, Meng S 2019 Nano Res. 12 587 Google Scholar
[28]	Nair R, Wu H, Jayaram P, Grigorieva I, Geim A 2012 Science 335 442 Google Scholar
[29]	Huang H, Song Z, Wei N, Shi L, Mao Y, Ying Y, Sun L, Xu Z, Peng X 2013 Nat. Commun. 4 2979 Google Scholar
[30]	Zhao L L, Ji J, Tao L, Lin S C 2016 Langmuir. 32 9188 Google Scholar
[31]	Ross D J K, Bustin R M 2009 Mar. Pet. Geol. 26 916 Google Scholar
[32]	Kerisit S, Weare J H, Felmy A R 2012 Geochim. Cosmochim. Acta 84 137 Google Scholar
[33]	Wang J, Kalinichev A G, Kirkpatrick R J 2006 Geochim. Cosmochim. Acta 70 562 Google Scholar
[34]	Cygan R T, Liang J-J, Kalinichev A G 2004 J. Phys. Chem. B. 108 1255 Google Scholar
[35]	Yuet P K, Blankschtein D 2010 J. Phys. Chem. B 114 13786 Google Scholar
[36]	Zhao L, Lin S, Mendenhall J D, Yuet P K, Blankschtein D 2011 J. Phys. Chem. B 115 6076 Google Scholar
[37]	Verlet L 1967 Phys. Rev. 159 98 Google Scholar
[38]	Delhommelle J, Philippe M 2001 Mol. Phys. 99 619 Google Scholar
[39]	Darden T, York D, Pedersen L 1993 J. Chem. Phys. 98 10089 Google Scholar
[40]	FrantzDale B, Plimpton S J, Shephard M S 2010 Eng. Comput. 26 205 Google Scholar
[41]	Alvarez N J, Uguz A K 2013 Phys. Fluids 25 7336
[42]	Span R, Wagner W J 1996 J. Phys. Chem. Ref. Data 25 1509 Google Scholar
[43]	Liu L, Du J G, Zhao J J, Liu H, Gao H L, Chen Y X 2009 Phys. Earth Planet. 176 89 Google Scholar

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