ZAN Cheng1， JIANG Haifeng2 a, 2 b， ZHANG Qiang2c, 2d，LI Hui2a, 2b， XU Qianghui2a, 2b， SHI Lin2a, 2b
（1. State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, Beijing 100083, China; 2. a. Department of Thermal Engineering; b. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education; c. Department of Chemical Engineering; d. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Tsinghua University, Beijing 100084, China）
Abstract: 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） of carbon 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 5.83×1010 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.
Keywords: nanofluid; crude oil; electrical conductivity; percolation threshold; carbon nanotube
中图分类号：TK124 文献标志码：A
文章编号：1008-5548（2014）04-0028-05
DOI:10.13732/j.issn.1008-5548.2014.04.007
收稿日期：2013-10-20， 修回日期：2013-10-31，在线出版时间：2014-08-28。
基金项目：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。
第一作者简介：昝成（1981—），男，博士，高级工程师，研究方向为油气田开发。 E-mail: zancheng@petrochina.com.cn。
通信作者简介：史琳（1964—），女，博士，教授，研究方向为工程热物理、流体工质热物性、纳米流体等。 E-mail: rnxsl@mail.tsinghua.edu.cn。
