Abstract: The fracturing flowback fluid in Sulige Gasfield is characterized by large volume，complex composition and great difficulties in treatment. After being treated by simple processes of oxidation，flocculation and sedimentation，the fracturing flowback fluid still fails to meet the standard for direct discharge or recycle. Besides，the need for storage of the treated fluid makes the operating cost increase. Therefore，more processes such as reduction and adsorption are added，so that the treated fluid can meet the standard for repreparing new fracturing fluid. Experimental results show that the concentrations of boron，calcium and magnesium ions which impair the performance of fracturing fluid in the treated fluid are obviously reduced and the quality of treated fluid is obviously improved. The re-prepared fracturing fluid system has a viscosity of 150 mPa∙s，satisfactory compatibility and gel breaking performance，and an average damage rate of about 17%. All of these indicators meet the requirements in relevant standards. In addition，the recycle technology of fracturing flowback fluid has been successfully applied in Sulige Gasfield.

Key words: Sulige Gasfield, fracturing flowback fluid, flowback treatment, re-prepared fracturing fluid

摘要： 苏里格气田压裂返排液具有返排量大、成分复杂、处理难度大等特点。简单的氧化-絮凝-沉淀的处理方法不足以使压裂返排液达到直接排放或再利用的标准，同时还会因为处理后液体需要贮存从而提高运营成本。因此，我们通过增加还原-吸附等处理过程，使处理后的压裂返排液达到重复配制压裂液的标准。实验结果表明，压裂返排液经过处理后，损伤压裂液性能的硼、钙镁离子浓度均出现了明显降低，水质明显改善；复配压裂液体系黏度达到150 mPa·s，配伍性良好，破胶性能良好，平均伤害率 17% 左右，均满足相关标准要求。并且该压裂返排液重复利用技术在苏里格气田进行了现场运用，均取得成功。

关键词: 苏里格气田, 压裂返排液, 返排液处理, 复配压裂液