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《CIESC Journal》 2019-01
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Experimental study on foaming characteristics of CO_2-crude oil mixture

WANG Cailin;GU Shuaiwei;LI Yuxing;HU Qihui;TENG Lin;WANG Jinghan;MA Hongtao;ZHANG Datong;Provincial Key Laboratory of Oil and Gas Storage and Transportation Security, China University of Petroleum (East China);Key Laboratory of Oil & Gas Storage & Transportation,PetroChina;  
CO_2enhanced oil recovery(CO_2-EOR) technique is a good choice that can not only limit global warming,but also cut the high cost of carbon capture and storage(CCS). CO_2 flooding produced fluid contains large amountsof CO_2 and a lot of foam will generate in the separation process due to decompression. To study the foaming characteristics of CO_2-crude oil system in oilfield separators, an experimental system was designed to simulate thereal environment. Depressurization method was used to study the foam behavior in the tests. The foaming process ofdissolved crude oil could be divided into depressurization stage and stable working pressure stage. Foam evolutionfrom generation to attenuation was recorded by high-speed camera, and foam behaviors at different stages weresummarized and analyzed. Foaming process could be divided into five stages: bubble formation, arrangement withsingle layer, bubble coalescence, bubble breakage and multilayer stack. As pressure decreased, the diameters of stable bubbles increased and the foam position moved upwards, and foaming behavior became more violent. Inaddition, foam form in crude oil belonged to spherical foam and the Gibbs-Marangoni effect of foam was found inthe tests. The attenuation mechanism and influencing factors of CO_2 foam were analyzed and it was found that gasdiffusion was the main mechanism for CO_2 foam attenuation. Furthermore, the effects of depressurization rate andstirring rate on the properties of foam were studied. The results show that the increase in depressurization rate hadno obvious effect on the foaming behavior in depressurization process while it would aggravate the foaming behaviorunder stable working pressure. When the rotation speed is less than or equal to 120 r/min, the increase of the stirring rate will aggravate the foaming behavior in the depressurization stage, but accelerate the foam decay understable working pressure.
【Fund】: 国家科技重大专项项目(2016ZX05016-002);; 中国石油天然气股份有限公司油气储运重点实验室项目(GDGS-KJZX-2016-JS-379)
【CateGory Index】: TE357.7
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