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Based on Zetasizer Nano ZS instrumentation, the zeta potential with Ca2+ and tight oil reservoir were analyzed to study the abilities and microscopic mechanisms on reservoir characteristics of wettability. The results show that in the CaCl2 solution, Ca2+ can reduce the surface hydrophilicity of tight sandstone, thus change the reservoir wetting characteristics. While increasing pH can improve reservoir wettability and facilitate tight oil development. Ca2+ can change the structural characteristics of tight reservoirs and crude oil. This provides a theoretical basis for our study of low salinity water flooding and recovery ratio. [ABSTRACT FROM AUTHOR]

Based on DSA100 instrumentation, the interactions between the chemical groups on the rock surface and brine were analyzed to study the abilities and microscopic mechanisms on reservoir characteristics of wettability controlled by Na+, Ca2+and Mn2+. The results show that that in the same solution, static and dynamic angle of each ions are consistent. When the concentration of CaCl2solution is more than 0.5 mol/L, the contact angle will change greatly. Ca2+, Mn2+can change the structural characteristics of tight reservoirs. This provides a theoretical basis for our study of low salinity water flooding and recovery ratio. [ABSTRACT FROM PUBLISHER]