油气田环境保护2025，Vol.35Issue(5)：14-20,7.DOI:10.3969/j.issn.1005-3158.2025.05.003
页岩气开发酸化压裂返排液处理技术试验研究
Experimental Study on Treatment Technology for Flowback Fluid from Shale Gas Acid Fracturing
摘要
Abstract
By analyzing the water quality of flowback fluids from acid fracturing in carbonate formations of shale gas reservoirs,this study evaluates existing domestic treatment technologies and proposes a five-step process:mixed sedimentation,Fenton oxidation for gel breaking,homogeneous coagulation,air flotation,and filtration.Field tests show treated effluent meets reinjection standards:pH 6-9,oil content≤5 mg/L,suspended solids≤15 mg/L,average corrosion rate≤0.06 mm/a.All indicators stably met reinjection standards the Main Control indicators for the water quality of carbonate rock reinjection in Q/SY TZ 0466-2016"Water Quality Standard of Olifield Produced Water for Injection",Grade V Water Quality Standard for Reservoir Air Permeability≥2.0 in SY/T 5329-2022"Water Quality Specification and Practice for Analysis of Oilfield Injecting Water in Clastic Reservoirs".Sludge generation was reduced from 3.9%to 1.8%.The results provide a reference for reinjection treatment of flowback fluids in unconventional shale gas development.关键词
酸化压裂返排液/Fenton氧化破胶/回注水Key words
acidizing fracturing flowback fluid/fenton oxidation gel-breaking/reinjection water分类
环境科学引用本文复制引用
李延隆,喻干,甘玉生,廖健,刘小江,田飞,陈曦,李颖..页岩气开发酸化压裂返排液处理技术试验研究[J].油气田环境保护,2025,35(5):14-20,7.基金项目
中国石油天然气股份有限公司油气和新能源分公司科技项目(C3类)课题3"油气田质量安全环保示范性技术推广与应用"(编号2024YQX303). （C3类）
