Field Test of Electrochemical Degradation and Oil-Removal Technology Used the Treatment of Wastewater Containing Polymer in Offshore Oilfield

Mengying Yang¹, Qing Li¹, Xianqing Yin^1*, Lei Zhai^2,3, Bo Jing^2,3

¹College of Chemical and Environmental Engineering, Yangtze University, Jingzhou, China.
²State Key Laboratory of Offshore Oil Exploitation, Beijing, China.
³CNOOC Research Institute, Beijing, China.

DOI: 10.4236/jwarp.2015.717114                

Abstract

Aimed at the current treatment status of the polymer-flooding wastewater in Bohai oilfield, electrochemical technology used for polymer-degradation and oil-removal was researched. It formed the process flow of cyclone mixed dosing → electrochemical removal oil → inclined tube removal oil → walnut shell filter, and a set of skid mounted wastewater containing polymer treatment plant was designed and manufactured, which was used for the field test of electrochemical treatment of wastewater containing polymer in offshore oilfield. The result shows that the oil removal rate of the electrochemical treatment process is over 98%, and the synergistic effect is significant especially used in conjunction with water clarifier of BHQ-04. When the amount of water clarifier is 50 - 150 mg/L, the oil content, the median particle diameter and the suspended solids content of the filtered water is 8 - 18 mg/L, 1.9 - 2.26 μm and 1.39 - 2.04 mg/L respectively, which reach the scene water quality standards for water injection.

Keywords

Electrochemical Removal Oil, Wastewater Containing Polymer, Synergistic Effect, Field Test

Conflicts of Interest

The authors declare no conflicts of interest.

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