油田压裂返排液的电化学处理  

Electrochemical treatment of oilfield fracturing flowback fluid

作　　者：郑帅 孙鑫格 谢亮 吴隽玮 石姝彤 杨萍萍 曾玉彬[2] ZHENG Shuai;SUN Xinge;XIE Liang;WU Junwei;SHI Shutong;YANG Pingping;ZENG Yubin(PetroChina(Xinjiang)Petroleum Engineering Co.Ltd.,Karamay 834000,China;School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China;China Petroleum Engineering Construction Company Southwest Branch,Chengdu 610000,China)

机构地区：[1]中油(新疆)石油工程有限公司,克拉玛依834000 [2]武汉大学动力与机械学院,武汉430072 [3]中国石油工程建设公司西南分公司,成都610000

出　　处：《环境工程学报》2023年第11期3543-3553,共11页Chinese Journal of Environmental Engineering

基　　金：2022年度新疆维吾尔自治区科学技术厅天山英才计划(2022TSYCJC0002)。

摘　　要：为探究电絮凝和电化学氧化法处理油田压裂返排液的机理,采用响应面法拟合了反应过程,考察了电化学反应动力学、活性物质以及电极板的形貌和成分的变化。结果表明,电絮凝和电化学氧化法的响应面模型相关性显著,精确度和可信度均在合理范围内,在最优实验条件下其对应的COD去除率分别可达88.2%和100.0%;压裂返排液经电絮凝和电化学氧化处理后去除COD的动力学分别适用于零级和一级动力学模型,反应速率常数分别为4.49 mg·(L·min)^(-1)和0.0054 min^(-1);电絮凝和电化学氧化处理压裂返排液起主要作用的活性物质分别是OH·和O_(2)·^(-);电絮凝反应后,阳极和阴极表面分别附有碳酸钙和絮体有机物,电化学氧化反应后,阳极和阴极表面分别覆盖着致密的有机污染物和钙镁碳酸盐。To investigate the mechanism of electrocoagulation and electrochemical oxidation methods treating oilfield fracturing backflow fluid,response surface methodology was used to fit the reaction process,and the electrochemical reaction kinetics,active substances,and changes in the morphology and composition of electrode plates were studied.The results showed that the correlation between the response surface models of electrocoagulation and electrochemical oxidation methods was significant,and the accuracy and reliability were in a reasonable range.Under the optimal experimental conditions,their COD removal rates could reach 88.16%and 100.00%,respectively.The COD removal kinetics for fracturing flowback fluid after electrocoagulation and electrochemical oxidation treatment were applicable to the zero order and first order kinetic models,respectively,and the reaction rate constant were 4.49 mg·L^(-1)·min^(-1)and 0.0054 min^(-1),respectively.The active substances that played a major role in the treatment of fracturing backflow fluid by electrocoagulation and electrochemical oxidation were OH·and O_2·~-,respectively.After the electrochemical reaction,the electrocoagulation anode and cathode were coated with calcium carbonate and flocculent organic matter on the surface,respectively,while the electrochemical oxidation anode and cathode surfaces were covered with dense organic pollutants and calcium magnesium carbonate,respectively.

关 键 词：油田压裂返排液 电絮凝 电化学氧化 响应面法 反应动力学 

分 类 号：X703[环境科学与工程—环境工程]