Experimental study on asphaltene precipitation induced by CO_2 flooding

作     者：DONG Zhao-xia WANG Jun LIU Gang LIN Mei-qin LI Ming-yuan 

作者机构：Enhanced Oil Recovery Research Institute China University of Petroleum Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery Key Laboratory of Enhanced Oil RecoveryCNPC 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2014年第11卷第1期

页      面：174-180页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：supported by the National Key Technologies R&D Program(2012BAC24B02) Basic Subject Fund of China University of Petroleum-Beijing(KYJJ2012-07-01) Basic Subject Fund of China University of Petroleum-Beijing(No.YJRC-2013-20) National Natural Science Foundation of China(51304222) 

主　　题：CO2 flooding asphaltene precipitation oil-water interfacial tension core permeability 

摘      要：The effects of CO2 pressure,temperature and concentration on asphaltene precipitation induced by CO2 were studied using a high-pressure vessel,interfacial tensiometer,Fourier transform infrared （FTIR） and drill core displacement experimental *** results indicated that the content of asphaltene in crude oil decreased,and the interfacial tension between a model oil and distilled water increased,with an increase of CO2 pressure,decrease of temperature and increase of molar ratio of CO2 to crude oil when CO2 contacted crude oil in the high pressure *** content of asphaltene in sweepout oil and the permeability of test cores both also decreased with an increase of CO2 flooding *** main reason for changes in content of asphaltene in crude oil,in interfacial tension between model oil and distilled water and in the permeability of the test core is the precipitation of asphaltene which is an interfacially active substance in crude *** of asphaltene also blocks pores in the drill core which decreases the permeability.