基于安全性考虑的压裂返排液处理过程中氢气产量优化研究  

Optimization of Hydrogen Production in Fracturing Flowback Fluid Treatment Process Based on Safety Considerations

作　　者：李利清 LI Liqing(No.5 Oil Production Plant of Daqing Oilfield Co.,Ltd.)

机构地区：[1]大庆油田有限责任公司第五采油厂,黑龙江省大庆市163414

出　　处：《油气田地面工程》2025年第4期24-30,共7页Oil-Gas Field Surface Engineering

摘　　要：为更好地调控电化学处理压裂返排液中产生的H_(2)产量,降低废液处理过程中的燃爆风险,利用自制的电化学反应装置,在双铝极板下研究了电解时间、电极间距、电流密度和初始pH值等因素对气体产量及处理深度的影响。通过响应面实验分析了一次项、交互项和组合项对H_(2)产量的影响,以H_(2)产量最小、COD去除率最大为目标函数,利用非线性回归实现了工艺参数优化,并进行了现场验证。结果表明:H_(2)产量在总产气量中占比较大,H_(2)S和CO_(2)的产量相对较小;电解时间和电流密度与H_(2)产量呈正相关,H_(2)产量随电极间距的增加先增大后减小,随初始pH值的增加先增大后减小;方差分析和三维曲面图表明电流密度对H_(2)产量的影响极其显著,且电解时间、电流密度和初始pH值之间存在明显的曲面交互效应;在电解时间30 min、电极间距10 mm、电流密度60 m A/cm^(2)、初始pH值6.9时,H_(2)产量最小,此时的COD去除率为80.26%。现场验证后,模型的符合性良好,处理后的废液满足安全和高效处理的要求。该研究结果可为压裂返排液的安全处理提供实际参考。In order to better regulate H_(2)production from electrochemical treatment of fracturing flowback fluid,and reduce the risk of explosion during waste liquid treatment,the effects of factors such as electrolytic time,electrode spacing,current density,and initial pH value on gas production and treatment depth are studied by using a self-made electrochemical reaction device under double aluminum plates.The effects of primary terms,interaction terms,and combination terms on H_(2)production are analyzed by response surface experiment.With the minimum H_(2)production and maximum COD removal rate as the objective function,the optimization of process parameters is realized by nonlinear regression and verified in the field.The results show that H_(2)production accounted for a large proportion of total gas production,while H_(2)S and CO_(2) production are relatively small.The electrolytic time and current density are positively correlated with the H_(2)production.The H_(2)production first increases and then decreases with the increase of electrode spacing,and the H_(2)production first increases and then decreases with the increase of initial pH value.The analysis of variance and the three-dimensional surface diagram show that the current density has a significant effect on H_(2)production,and there is an obvious surface interaction effect between electrolytic time,current density,and initial pH value.When the electrolytic time is 30 min,the electrode spacing is 10 mm,the current density is 60 mA/cm^(2),and the initial pH value is 6.9,the H_(2)production is the smallest,and the COD removal rate is 80.26%.After field verification,the conformity of the model is good,and the waste liquid after treatment meets the requirements of safe and efficient treatment.The research results can provide a practical reference for the safe treatment of fracturing flowback fluid.

关 键 词：电化学 压裂返排液 H2产量 燃爆风险 响应面 

分 类 号：X741[环境科学与工程—环境工程]