陆相页岩气井压裂返排液处理工艺

Treatment of Fracturing Fluid Flowback of Continental Shale Gas Well

何 飞 胡耀强 李 辉

HE Fei HU Yao-Qiang LI Hui

采用“氧化—絮凝—过滤”处理工艺，对陆相页岩气井压裂返排液进行处理试验研究，讨论了工艺中各参数对处理效果的影响，确定了处理药剂最佳加药方案：氧化剂OD-H加量为1 g/L、絮凝剂IF-L加量为60 mg/L、助凝剂OF-Y加量为2mg/L; 氧化时间为5 min，沉降时间为20 min。处理后的水中SS＜4.0 mg/L、SRB和FB细菌含量≤n×10个/mL、动力黏度＜1.2 mPa·s、ΣFe＜0.2 mg/L，出水水质符合配制压裂液用水的要求。

The combination process of the “Oxidation-Flocculation- Filtration” was used for the treatment of fracturing fluid flowback (FFF) from the continental shale gas well. The effects of chemical agents on the treatment were discussed in detail, and the optimum experimental condition was determined. The experimental results showed that when the FFF was oxidized by 1 g/L Oxidation agent OD-H for 5 min, flocculated by 60 mg/L Flocculation agent IF-L and 2 mg/L coagulant aid OF-Y for 20 min, and filtrated subsequently, the effluent water quality met the requirement of confecting fracturing fluid water. the suspended solids of the effluent water was lower than 4.0 mg/L, bacterial content was lower than n×10个/mL, dynamic viscosity was lower than 1.2 mPa·s and ΣFe content was lower than 0.2 mg/L.