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Supercritical carbon dioxide (SC-CO 2 ) fracturing technology has the advantages of CO 2  storage and waterless fracturing and has great application potential in the development of unconventional oil and gas resources. However, the low viscosity of SC-CO 2  limits the development of this technology. This paper investigates the synergistic effect of nanomaterials on a developed thickener (HBD-2, high branched D4H). The research results show that among the five micro/nanomaterials Cu-BTC, SiO 2 , MCC, MWCNTs, and TiO 2 , only SiO 2  has a good synergistic effect on the HBD-2/SC-CO 2  system, and significantly improves its thickening, temperature resistance, temperature resistance and shear resistance. At 60s −1 , 305.15 K and 10 MPa, 5 wt.% HBD-2 + 1 wt.% SiO 2  increased the apparent viscosity of SC-CO 2  to 5.82 mPa·s(The viscosity of 5 wt.% HBD-2 under the same conditions is 4.48 mPa·s). The apparent viscosity of SC-CO 2  is positively correlated with pressure and SiO 2  dosage and negatively correlated with temperature and shear rate. The SiO 2 /HBD-2 system can effectively avoid clay swelling and can change the water wetness on the core surface to neutral wettability. In addition, we also studied the mechanism of SiO 2  in HBD-2/SC-CO 2  thickening system by RDF(radial distribution function). The results show that the introduction to SiO 2  shifts the peak position of the system to the left and enhances the peak intensity. The macroscopic manifestation is the enhancement of the apparent viscosity of HBD-2/SC-CO 2 .This paper proves the feasibility of nanomaterials to synergize SC-CO 2 , and provides a new thread for the research and development of SC-CO 2  thickeners in the future.

SiO 2 synergistic modification of siloxane thickener to improve the viscosity of supercritical CO 2 fracturing fluid