Abstract:For domestic low permeability reservoir accounted for more and more large, conventional flooding agent cannot meet the requirements of production, nano flooding material because of its good injection, small reservoir damage, improve the oil recovery effect is obvious and is applied to low permeability reservoir mining, the MoS2 nanoscale because of its simple preparation method and low cost by more and more attention. However, due to the poor dispersion stability of nanomaterials in low permeability reservoirs, they often need to play a synergistic role with surfactant to improve their performance. It is of very important significance to clarify the interaction between MoS2 and surfactant to improve the application range of MoS2. Here, MoS2 nanosheets were synthesized by hydrothermal method, using thioacetamide as sulfur source and molybdenum trioxide as molybdenum source. The effects of different surfactants on the dispersion stability of MoS2 nanosheets in saline was studied, and a new nanoscale oil-driven system CTAB-MoS2, and finally, the interfacial performance and enhanced recovery performance of CTAB-MoS2 was constructed. The experimental results showed that the introduction of CTAB significantly improved the dispersion stability of MoS2 nanosheets in 3000 mg/L NaCl solution, the self-stabilization time of 0.1wt.% CTAB-MoS2 increased from less than 3h to 12h, the average particle size of CTAB-MoS2 decreased from 122.7nm to 98.1nm compared with MoS2, and the absolute value of Zeta potential changed from 25 mV to 33.8mV. CTAB-MoS2 can spontaneously form interface membrane and climbing membrane at the n-heptane/water interface, and can reduce the tension of n-heptane / water interface to 0.175 mN/m, and also has good emulsifying effect. Based on its excellent salt tolerance and good interface activity, CTAB-MoS2 has some enhanced oil recovery effect in the hypotonic environment. Only 0.5PV concentration of 0.005wt.% was injected at 60℃ and NaCl concentration of 3000 mg/L. The construction of CTAB-MoS2 is expected to provide a solution for the efficient development of low permeability fields and a research idea for improving the dispersion stability of nanomaterials.