致密气压裂返排液及生产水处理耦合工程优化  

Optimization of Coupled Tight Gas Fracturing Flowback Fluid and Production Water Treatment Project

作　　者：许跃 许洪祝 周启立 陆彩霞 史金卓 刘洋 XU Yue;XU Hong‑zhu;ZHOU Qi‑li;LU Cai‑xia;SHI Jin‑zhuo;LIU Yang(CNOOC Tianjin Chemical Research and Design Institute Co.Ltd.,Tianjin 300131,China)

机构地区：[1]中海油天津化工研究设计院有限公司,天津300131

出　　处：《中国给水排水》2025年第6期117-121,共5页China Water & Wastewater

基　　金：中海油能源发展股份有限公司资助项目(HFKJ-ZDGG-TJY-2021-04)。

摘　　要：临兴中区LX-156水处理站处理规模为480 m^(3)/d,原采用“调节/涡凹气浮/多介质过滤/精细过滤”处理工艺。为满足生产建设要求及解决工艺运行不稳定等问题,该水处理站改造后处理规模提升至1080 m^(3)/d,根据压裂返排液及生产水水质特点,采用“预处理/一体化破胶/涡凹气浮/高密度斜管沉降/保安过滤/精细过滤”耦合工艺。该工程采用一体化撬装式设备进行原位扩容,在破胶脱稳30 min,气浮处理24 min,高密度斜管沉降器投加PAC 300 mg/L、PAM 15 mg/L、NaOH 800mg/L的条件下,整个工艺稳定运行128 d,处理达标回注水125435 m^(3),出水关键指标含油量≤30 mg/L、悬浮物≤10 mg/L、颗粒直径中值≤4μm,满足《碎屑岩油藏注水水质推荐指标及分析方法》(SY/T 5329—2012)的高渗透率油层回注水水质标准。The LX-156 water treatment station in Linxing Central District with treatment capacity of 480 m^(3)/d,originally adopted the treatment process of conditioning/turbulent air flotation/multi‑media filtration/fine filtration.To satisfy the production construction requirements and solve the process instability problem,the capacity of the water treatment station was increased to 1080 m^(3)/d after renovation.According to the characteristics of fracturing flowback fluid and production water quality,the coupled process of pretreatment/integrated rubber breaker/vortex concave air flotation/high‑density sedimentation/security filtration/fine filtration was adopted.In‑situ capacity is expanded using integrated skid‑mounted equipment.By breaking and destabilizing for 30 min,air flotation treatment for 24 min,as well as adding PAC of 300 mg/L,PAM of 15 mg/L,and NaOH of 800 mg/L in high density sedimentation,125435 m^(3)of refill water was treated up to the standard after operated stably for 128 days.The key effluent indexes include oil content≤30 mg/L,suspended solids concentration≤10 mg/L,and diameter median of suspended solids≤4μm,which met the water quality standards for reinjection water from high permeability oil reservoirs in Water Quality Standard and Practice for Analysis of Oilfield Injecting Waters in Clastic Reservoirs(SY/T 5329-2012).

关 键 词：致密气 压裂返排液 生产水 技术改造 工艺优化 

分 类 号：X741[环境科学与工程—环境工程]