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含压裂返排液油田采出水处理工程实例分析
Case analysis of treatment engineering for oilfield′s produced water containing fracturing flowback fluid
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- DOI:
- 作者:
- 赵庆洁
- 作者单位:
- 大庆油田有限责任公司第三采油厂，黑龙江大庆 163000
- 关键词:
- 压裂返排液；油田采出水；药剂优化；微电解工艺；回注标准
fracturing flowback fluid; oilfield′s produced water; chemical optimization; micro-electrolysis process; reinjection standard
- 摘要:
- 针对部分压裂返排液随采出水进入现有处理设施，破坏系统平衡并导致出水水质难以达标的工程问
题，以某低渗透油田联合站为研究对象，在系统分析现有处理工艺流程适应性的基础上，采用响应面法优化芬
顿试剂的反应条件，对比分析单一化学絮凝工艺的处理局限，进而引入铁碳微电解工艺，考察材料投加量、
pH值、曝气量及反应时间等因素对处理效果的影响规律；最终将优化后的芬顿氧化-微电解组合工艺集成于
缓冲罐单元完成现场工艺改造，并对实际运行效果进行连续监测。结果表明：芬顿试剂最佳反应条件为
FeSO₄·7H₂O质量浓度120 mg/L、H₂O₂质量浓度250 mg/L、pH=5、反应时间75 min；微电解工艺最佳参数为材
料加量100 g/L、pH=4、曝气量1 L/min、反应时间60 min；在缓冲罐内一体化改造完成后，系统出水水质达
标率100%，药剂消耗量、设备反冲洗频率与故障频次均显著下降，年节约运行成本共计38.5万元。
To address the engineering problem that some fracturing flowback fluid enters the existing treatment system along with produced water, disrupting the system balance and making it difficult for the effluent to meet standards, a combined station in a low permeability oilfield was taken as the research object in this paper. Based on a systematic analysis of the adaptability of the existing treatment process flow, the response surface method was used to optimize the reaction conditions of Fenton reagent, and the treatment limitations of a single chemical flocculation process were comparatively analyzed. Furthermore, the iron-carbon micro-electrolysis process was introduced to investigate the influence of factors such as material dosage, pH value, aeration rate, and reaction time on the treatment effect. Finally, the optimized Fenton oxidation-micro-electrolysis combined process was integrated into the buffer tank unit to complete the on-site process transformation, and the actual operation effect was continuously monitored. The results show that the optimal reaction conditions of Fenton reagent are FeSO4 ·7H2 O mass concentration of 120 mg/L, H2 O2 mass concentration of 250 mg/L, pH of 5, and reaction time of 75 min; the optimal parameters of the micro-electrolysis process are material dosage of 100 g/L, pH of 4, aeration rate of 1 L/min, and reaction time of 60 min. After the integrated transformation in the buffer tank, the water quality compliance rate of the system effluent reaches 100%, and the chemical consumption, equipment backwashing frequency, and failure frequency are significantly reduced, saving a total of 385 000 yuan in operating costs annually.