Aiming at the reservoir characteristics of strong reservoir heterogeneity, circulation way widely distributed and poor water flooding effect in X oilfield of yanchang, a kind of nano⁃microsphere oil displacement agent WQ⁃3 was systhesized. The microstructure, swelling property, viscoelasticity and shear resistance performance were evaluated through the indoor experiments. The core⁃flow experiment was used to evaluate the performance of the regulator in heterogeneous core. The results showed that nano⁃microsphere WQ⁃3 are spherical nanoparticles with good roundness and the average particle size is 404.92 nm. At 80 ℃ in simulated formation water, the expansion ratio of the nano⁃microspheres after 24 h of water absorption is 34.96 g/g. Nano⁃microsphere WQ⁃3 has obvious viscoelastic properties after water absorption, showing the properties of soft solids. At high shear rate, nano⁃sphere WQ⁃3 system has better shear resistance; the injection pressure rises rapidly and the oil recovery increased as high as 14.25% of the injection of WQ⁃3 system.

In the new mixed solvent of waste lubricant regeneration research process, applied the orthogonal method, investigated the refined effect of the operating temperature, refining time, the ratio of oil to solvent, the amount of the second solvent added to (DMF), the amount of the auxiliary solvent (polyether2070) added to five factors in four different levels. The range analysis shows that the added amount of the DMF and polyether2070 are the key factors of influencing the yield, as the change of the amount of polyether 2070 added to has little effect on the viscosity index, while the volumic ratio of solvent to oil and the amount of DMF added to on the viscosity index of the big influence.Mean analysis shows that the best refining conditions of the solvent is for the temperature being 80 ℃, the refine time being 30 min, the volumic ratio of solvent to oil being 1.5∶1, the amount of DMF added to being 15%, polyether2070 added to being 0.2%. In the optimal experimental conditions, the total yield of renewable lubricant reaches 91.7%, its viscosity index reaches 108.8.