Abstract:
To provide a theoretical basis for the development of functional fracturing fluids, SiO
2 was modified with C
8 and quaternary ammonium salt (QAS) on nanoscale (50 nm). The hydrophobic nanomaterial SiO
2-C
8 and hydrophobic charged nanomaterial SiO
2-QAS were synthesized. The compatibility, stability, and comprehensive performance of the SRFP polymer clean fracturing fluid systems were evaluated as nanomaterials SiO
2, SiO
2-C
8, and SiO
2-QAS were added. Quantitative simulation methods were employed to build the adsorption structure models and adsorption kinetics models of the nanomaterials on the sandstone surface. The adsorption and oil-water separation characteristics of nanomaterials on sandstone surfaces were analyzed. The experimental and simulation results show that the three nanomaterials, SiO
2, SiO
2-C
8, and SiO
2-QAS, display favorable dispersion stability in fracturing fluids. They can effectively reduce the surface and interfacial tension and demonstrate good temperature and shear resistance. SiO
2-C
8 and SiO
2-QAS nanomaterials are beneficial to the replacement of oil molecules on the sandstone surface and the oil-water separation when they are added into fracturing fluids. The addition of nanomaterials SiO
2-C
8 and SiO
2-QAS can also effectively improve the performance of fracturing fluids, enhance oil displacement, and reduce oil saturation within the spread range of fracturing fluids. The research results can provide a theoretical basis for the development of functional fracturing fluids and a reference for fracturing design optimization and fracturing fluid selection for tight oil and shale oil.
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