新疆石油地质

新疆石油地质 ›› 2018, Vol. 39 ›› Issue (zk(English) ): 116-123.

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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
  • 收稿日期:2017-12-19 修回日期:2018-04-02 出版日期:2019-01-01 发布日期:2021-05-19

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
  • Received:2017-12-19 Revised:2018-04-02 Online:2019-01-01 Published:2021-05-19
  • About author:CHEN Xi, E-mail: xchen63@petrochina.com.cn

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摘要： 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 60 times more than the crude oil viscosity, and the mixture becomes 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 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.

关键词: Janus SiO2/PS nano-particle, water-oil volume ratio, emulsifier, water-in-oil emulsion, rheological property, improvement of sweep efficiency

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 60 times more than the crude oil viscosity, and the mixture becomes 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 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.

Key words: Janus SiO2/PS nano-particle, water-oil volume ratio, emulsifier, water-in-oil emulsion, rheological property, improvement of sweep efficiency