新疆石油地质

›› 2018, Vol. 39 ›› Issue (3): 1-1.doi: 10.7657/XJPG20180310

• 论文 •    

基于Janus SiO2/PS纳米颗粒的乳液相行为及流变性

陈希1，2，马德胜2，田茂章2，宋新民2，吴朝东1，韩璐2，梁福鑫3   

  1. (1. 北京大学 地球与空间科学学院,北京 100871;2. 中国石油 勘探开发研究院 提高石油采收率国家重点实验室,北京 100083;3. 中国科学院 化学研究所 高分子物理与化学国家重点实验室,北京 100190)
  • 出版日期:2019-01-01 发布日期:1905-07-16

Phase Behavior and Rheological Properties of Emulsions Based on Janus SiO2/PS Nano-Particles

CHEN Xi1,2, MA Desheng2, TIAN Maozhang2, SONG Xinmin2, WU Chaodong1, HAN Lu2, LIANG Fuxin3   

  1. (1.School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2.State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing100083, China; 3.State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China)
  • Online:2019-01-01 Published:1905-07-16

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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（CS）及不同水油体积比（RWO）条件下形成乳液的相行为进行了研究。固定CS=0.100%，当RWO≤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RWO>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RWO=7/3，当0.080%≤CS≤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CS<0.080%或CS>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RWO=4/6，当0.001%≤CS≤0.500%时，油水完全混相，乳液黏度为55~75 mPa·s，并在剪切速率为3.00~70.00 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。

Abstract: Regarding microstate and rheological property, the paper studies the phase behaviors of the emulsions formed by the crude oil obtained from 81# combination station of Karamay oilfield and the aqueous dispersion system of Janus SiO2/PS nano-particles under the conditions of different mass fraction (CS) and different water-oil volume ratio (RWO). Setting CS=0.100%, when RWO≤7/3, stable water-in-oil emulsion is formed by the aqueous dispersion system of Janus SiO2/PS nano-particles and the crude oil, and both the droplet size and viscosity of the emulsion increase with the rise of the water-oil volume ratio; when RWO>7/3, the oil-water miscible liquid has 2 phases—the upper is water-in-oil emulsion and the lower is dominated by water, the viscosity of the emulsion decreases with the increase of the water-oil volume ratio. Setting RWO=7/3, when 0.080%≤CS≤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 CS<0.080% or CS>0.300%, the oil-water miscible liquid has 2 phases and the emulsion viscosity decreases with the increase of the volume of separated water. Setting RWO=4/6, when 0.001%≤CS≤0.500%, oil and water are mixed completely with the emulsion viscosity of 55~75 mPa·s, and the emulsion becomes shear thickening at the shearing rate of 3.00~70.00 s-1. The results show that the aqueous dispersion system of Janus SiO2/PS nano-particles allows the crude oil to form stable, high-viscosity water-in-oil emulsion at relatively high water cut, and within a certain range of water-oil volume ratio, the higher the water cut, the higher the viscosity of the emulsion. The conclusion can provide a new idea for improving sweep efficiency in heterogeneous reservoirs

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