基于Janus SiO_2/PS纳米颗粒的乳液相行为及流变性  

Phase Behavior and Rheological Properties of Emulsions Based on Janus SiO_2/PS Nano-Particles

作　　者：陈希 马德胜[2] 田茂章[2] 宋新民[2] 吴朝东[1] 韩璐 梁福鑫[3] CHEN Xi;MA Desheng;TIAN Maozhang;SONG Xinmin;WU Chaodong;HAN Lu;LIANG Fuxin(School of Earth and Space Sciences,Peking University,Beijing 100871,China;State Key Laboratory of Enhanced Oil Recovery,Research Institute of Petioleum Exploration and Development,PetroChina,Beijing100083,China;State Key Laboratoi7 of Polymer Physics and Chemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[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　　处：《新疆石油地质》2018年第3期326-332,371,共8页Xinjiang Petroleum Geology

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目(2016a-0901)

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 SiO_2/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 SiO_2/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55~75 m Pa·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 SiO_2/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。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（CS） and different water-oil volume ratio（RWO）. Setting CS=0.100%, when RWO≤ 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 RWO7/3, 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 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 CS0.080% or CS0.300%, the oil-watermiscible 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 m Pa·s, and the emulsion becomesshear 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-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.

关 键 词：JANUS SiO2/PS纳米颗粒 水油体积比 乳化剂 油包水乳液 流变性能 乳化扩大波及体积 

分 类 号：TE357[石油与天然气工程—油气田开发工程] TE39