Microscopic surface wettability electrochemical characterization of tight sandstone with infrared spectra testing

3rd International Conference on Water Resource and Environment

地球科学;生态环境科学

Song, L.^1 ; Ning, Z.F.^1 ; Li, N.^2 ; Zhang, B.^2 ; Ding, G.Y.^1

School of Petroleum Engineering, China University of Petroleum, Beijing

102249, China^1

Research Institute of Petroleum Production Engineering, Huabei Oilfield Company of Petro China, 062552, China^2

关键词: Bond interactions;    Double electric layer;    Electric double layer;    Electrochemical characterizations;    Fourier transform infrared;    Infrared spectrum;    Microscopic surface;    Viscosity effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/82/1/012071/pdf
DOI  :  10.1088/1755-1315/82/1/012071

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The distribution of charge density on the surface of microscopic tight oil is studied by using Stern double electric layer theory, and the mathematical flow model of polar fluid with micro powers in tight oil reservoir is established. The Fourier transform infrared (FTIR) were used to investigate the interaction of rock surface functional groups with fluids. The results show that: (1) When the external fluid of the polar group passes through the dense micro-nano pore, it will form an electric double layer on the surface of the rock, there will be a certain thickness of the liquid membrane, the fluid migration has a certain Of the electrical viscosity effect, will have a certain flow resistance. (2) The Fourier transform infrared spectroscopy of the Chang 7 tight reservoir rock samples exists and distributes different kinds of peaks. The left peak trend determines the presence of hydroxyl groups. The four fronts and types of the right side can be used to obtain that calcium carbonate CO32-exists. (3) There are CO32-and hydroxyl functional minerals in the Chang 7 tight sandstone samples. It is consistent with the basic mineral analysis measured by X-ray diffraction. When the external fluid affects the rock surface, the surface will occur in the physical van der Waals force and chemical bond interaction, so it will affect the flow of water on the surface.