An Experimental Study on Efficient Demulsification for Produced Emulsion in Alkaline/Surfactant/Polymer Flooding

被引:12
|
作者
Song, Yang [1 ]
Xu, Yunfei [2 ]
Wang, Zhihua [2 ]
机构
[1] China Univ Petr East China, Coll Pipeline & Engn, Qingdao 266580, Peoples R China
[2] Northeast Petr Univ, Minist Educ, Key Lab Enhanced Oil & Gas Recovery, Daqing 163318, Peoples R China
来源
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME | 2022年 / 144卷 / 09期
基金
中国国家自然科学基金;
关键词
ASP produced emulsion; emulsification; electric field destabilization; charge neutralization; parameter optimization; petroleum engineering; petroleum transport; pipelines; multiphase flow; OIL-RECOVERY; WATER; FIELD; DEHYDRATION; FLOCCULANTS;
D O I
10.1115/1.4053136
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Tertiary oil recovery technologies, for example, alkaline/surfactant/polymer (ASP) flooding, can enhance oil recovery as an important oil displacement technology noteworthy in the present oilfields. However, it is the fact that the produced emulsion droplets have strong electronegativity, which will lead to the destabilization of electric field and affect the dehydration effect in the process of electric dehydration. This article innovatively proposed an efficient demulsification scheme, which uses polyaluminum chloride (PAC) as a chemical regulator to control electric field destabilization through the charge neutralization mechanism and then introduces demulsifier to promote oil-water separation. Furthermore, the dehydration temperature, power supply mode, and electric field parameters are optimized so as to achieve superior dehydration effect of ASP flooding produced liquid. The results indicate that PAC as a chemical regulator by exerting charge neutralization and electrostatic adsorption mechanism could reduce the electronegativity of the emulsified system, decrease the peak current of dehydration, shorten the duration of peak current of dehydration, improve the response performance of the electric field, and increase dehydration rate in the ASP flooding dehydration process. When the demulsifier dosage is 100-120 mg/l, using the composite separation process with the dehydration temperature of 45-50 degrees C for the thermochemical separation stage and 60 degrees C in the electrochemical dehydration stage and AC-DC composite electric field or pulse electric field can achieve better dehydration effect. The investigations in this study will provide support and basis for the efficient treatment of ASP flooding produced emulsion.
引用
收藏
页数:15
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