Emulsification Behavior and Electro-chemical Dehydration Method of Produced Liquid in High Concentration Polymer Flooding Wells

doi:10.11885/j.issn.1674-5086.2015.05.06.04

Abstract

Abstract: Owing to the oil-water separation efficiency of produced liquid with high concentration polymer flooding and its impact on conventional AC-DC electric fields, the emulsification behavior and dehydration method of these types of emulsions were studied. Many evaluation methods were used for the gathering conditions, such as phase-inversion characteristics, electronegativity, distribution of emulsified oil-particle diameters, interface properties, micro-morphology of emulsions, and oil-water separation bottle tests. A dehydration experimental device with a pulsed power supply was established, and the adaptability of high concentration polymer flooding produced liquid was assessed. The results indicate that the emulsified behavior of produced liquid in high concentration polymer flooding wells was closely related to an increase in polymer concentration. Increasing the polymer concentration enhanced the electronegativity and decreased the phase inversion points of emulsions to different degrees. Furthermore, difficulties of coalescence and phase separation increased because the high polymer concentration promoted the formation of a viscoelastic interfacial film. The oil-water separation effect can be improved in the dehydration process of a pulse power supply electric field with demulsifiers, and the dehydration operational stability can be perfected.

Key words: high concentration polymer flooding, emulsification property, dehydration, produced liquid, Daqing Oilfield

CLC Number:

TE863

ZHANG Hongqi, LIU Yang, WANG Zhihua, XU Mengmeng. Emulsification Behavior and Electro-chemical Dehydration Method of Produced Liquid in High Concentration Polymer Flooding Wells[J]. 西南石油大学学报(自然科学版), 2017, 39(1): 177-184.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2015.05.06.04

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I1/177

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