【摘要】 从微观状态和流变性能方面对克拉玛依油田81#联合站原油与Janus SiO₂/PS纳米颗粒水分散体系在不同质量分数（C_S）及不同水油体积比（R_WO）条件下形成乳液的相行为进行了研究。固定C_S=0.100%,当R_WO≤7/3时,Janus SiO₂/PS纳米颗粒水分散体系与原油形成稳定的油包水乳液,乳液液滴粒径和黏度都随水油体积比升高而增大;当R_WO>7/3时,油水混合液分为上、下两相,上部为油包水乳液,下部以水为主,乳液黏度随水油体积比升高而降低。固定R_WO=7/3,当0.080%≤C_S≤0.300%时,油水完全混相,乳液黏度超过原油黏度的60倍,并且在高剪切速率时剪切变稀;当C_S<0.080%或C_S>0.300%时,油水混合液分为两相,并且黏度随分水体积增加而降低。固定R_WO=4/6,当0.001%≤C_S≤0.500%时,油水完全混相,乳液黏度为55⁷5 m Pa·s,并在剪切速率为3.00⁷0.00 s^-1时剪切增稠。以上结果表明,Janus SiO₂/PS纳米颗粒水分散体系使原油在较高含水条件下形成稳定高黏的油包水乳液,并且在一定水油体积比范围内含水越高乳液黏度越高。这个研究结果为非均质油藏扩大波及体积提供了新思路。更多还原

【Abstract】 Regarding microstate and rheological property, the paper studies the phase behaviors of the emulsions formed by the crude oilobtained from 81# combination station of Karamay oilfield and the aqueous dispersion system of Janus SiO₂/PS nano-particles under theconditions of different mass fraction（C_S） and different water-oil volume ratio（R_WO）. Setting C_S=0.100%, when R_WO≤ 7/3, stable water-in-oilemulsion is formed by the aqueous dispersion system of Janus SiO₂/PS nano-particles and the crude oil, and both the droplet size and viscos-ity of the emulsion increase with the rise of the water-oil volume ratio; when R_WO>7/3, the oil-water miscible liquid has 2 phases—the upperis water-in-oil emulsion and the lower is dominated by water, the viscosity of the emulsion decreases with the increase of the water-oil vol-ume ratio. Setting R_WO=7/3, when 0.080%≤ C_S≤ 0.300%, oil and water are mixed completely with the emulsion viscosity of more than 60 times of the crude oil viscosity, and the mixture becomes shear thinning at high shearing rate; when C_S<0.080% or C_S>0.300%, the oil-watermiscible liquid has 2 phases and the emulsion viscosity decreases with the increase of the volume of separated water. Setting R_WO=4/6,when 0.001%≤ C_S≤ 0.500%, oil and water are mixed completely with the emulsion viscosity of 55⁷5 m Pa·s, and the emulsion becomesshear thickening at the shearing rate of 3.00⁷0.00 s^-1. The results show that the aqueous dispersion system of Janus SiO₂/PS nano-particlesallows the crude oil to form stable, high-viscosity water-in-oil emulsion at relatively high water cut, and within a certain range of water-oilvolume ratio, the higher the water cut, the higher the viscosity of the emulsion. The conclusion can provide a new idea for improving sweepefficiency in heterogeneous reservoirs.更多还原