油基纳米流体的电导率  

Electrical Conductivity of Oil-based Nanofluids

作　　者：昝成[1] 江海峰[2,3] 张强[4,5] 李辉[2,3] 许强辉[2,3] 史琳[2,3] 

机构地区：[1]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 [2]清华大学热能工程系,北京100084 [3]清华大学热科学与动力工程教育部重点实验室,北京100084 [4]清华大学化学工程系,北京100084 [5]清华大学绿色反应工程与工艺北京市重点实验室,北京100084

出　　处：《中国粉体技术》2014年第4期28-32,共5页China Powder Science and Technology

基　　金：教育部博士点基金项目;编号:20110002110088;中国石油天然气股份有限公司科学研究与技术开发项目;编号:2011A-1000

摘　　要：以1种典型成品油和2种典型原油为基液,采用两步法制备油基纳米流体,研究含不同质量分数的球形氧化铁纳米颗粒与大长径比碳纳米管对油样电导率的影响,分析油基纳米流体电导率变化的主要机理.结果表明：氧化铁油基纳米流体电导率没有明显增大,碳纳米管油基纳米流体电导率均显著增大;碳纳米管成品油基纳米流体的渗流阈值（质量分数,以下同）为0.27％,添加质量分数为2％的碳纳米管分散液的成品油基纳米流体电导率增大5.83×1010倍;2种添加碳纳米管的原油基纳米流体与成品油基纳米流体的电导率变化规律类似,渗流阈值为0.1％～0.3％,添加质量分数为0.5％的碳纳米管分散液的原油基纳米颗粒电导率增大近1 000倍;大长径比碳纳米管通过在原油中建立电桥,有效增大了原油电导率.Taking one kind of refined oil and two kinds of crude oils as base fluids, oil-based nanofluids were prepared by two-step method. The effect of two kinds of different nano-particles which were spherical iron oxide nano-particles and large length diameter ratio carbon nanotubes on the electrical conductivity of oil samples were studied. The main mechanism of electrical conductivity change of oil-based nanofluids was analyzed. The results indicate that the oil-based nanofluids containing iron trioxide nano-particles show weak enhancement on electrical conductivity. The electrical conductivity of nanofluids with carbon nanotubes significantly enhances. The percolation threshold （mass fraction） ofcarbon nanotubes refined oil-based nanofluids is 0.27%. The electrical conductivity of refined oil-based nanofluids adding carbon nanotubes dispersant with mass fraction of 2% increases 5.83×10%times. Two kinds of crude oil-based nanofluids adding carbon nanotubes and refined oil-based nanofluids have the similar changing rule of electrical conductivity. The percolation threshold is between 0.1% and 0.3%. The electrical conductivity of crude oil-based nanofluids adding carbon nanotubes dispersant with mass fraction of 0.5% increases nearly 1 000 times. The electrical conductivity of the crude oil is enhanced effectively by large length diameter ratio carbon nanotubes which builds an electrical bridge in crude oil.

关 键 词：纳米流体 原油 电导率 渗流阈值 碳纳米管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]