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石油与天然气化工
CHEMICAL ENGINEERING OF OIL & GAS
酸化返排液无害化处理技术研究
吴伟
中国石化胜利油田分公司油气开发管理中心
2017
摘要针对现有酸化返排液处理工艺不完善、水质不达标，影响联合站正常运行的问题，通过对多口酸化并返排液的分析表明，酸化返排液具有PH值低、总铁离子浓度高、腐蚀速率高等特点，建立了
“况降-中和-氧化-絮疑”组合处理工艺，优化确定了工艺参数，实现处理后水pH值为6.7～7.5，总铁离子质量浓度小于5mg/L，扁蚀速率小于0.076mm/a，原油质量浓度低于20mg/L，悬浮物质量浓度低于20mg/L，达到联合站进水要求。
关键词酸化返排液无害化处理
水质指标
中图分类号：TE992.2
文献标志码：A
DOl; 10.3969/j.issn.1007-3426.2017,03.022
Astudyonacidizingflowbackwatertreatment
WuWei
Management Center of Oil and Gas Deuelopment Shengli Oilfield Co.Ltd.,
Sinopec, Dongying, Shandong, Chind
Abstract: Since current acidizing flowback water treatment system was not well designed, the effluent could not meet the requirements and influence the operation of the joint station. In this study, based on analysis of multiple water samples, it was concluded that the acidizing flowback water was always associated with low pH, high total iron concentration, and high corrosion rate. Furthermore, combined process as"sedimentation-neutralizaiton-oxidation-coagulation/flocculation" was developed and the operation parameters were optimized to improve the treatment. The results showed that the treated water could satisfy the requirements of the joint station, with the situation that pH ranges from 6.77.5, total iron concentration is below 5 mg/L, corrosion rate is less than 0. 076 mm/a,oil content is below 20 mg/L, and total suspended solid content is less than 20 mg/L. This study provided technical reference for acidizing flowback water treatment,
Key words: acidizing flowback water, innocent treatment, water quality parameter
酸化是油井增产和水井增注的主要措施。据统计，目前胜利油田年实施酸化井约1000口，产生约 5X10″m"酸化返排液。酸化返排液中不仅含大量残酸，还含有大量黏土稳定剂、表面活性剂、缓蚀剂、助排剂等添加剂，以及酸化过程中产生的钙离子与镁离子
等的可溶性盐，同时含大量原油和悬浮杂质，具有较高的矿化度和COD值，达标外排处理难度大{1-2]。将其进行妥善处理后，用于注水开发，或循环回用于再次酸化，具有积极的意义。目前对酸化返排液的处理方式主要有：①未经处理直接注人高渗透层；②简单中和处
基金项目：胜利油田科技攻关项目“酸化返排液回用处理技术研究"(YG1505）。
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E-mail; wuwei656, slyt@sinopec, com 万方数据