Abstract:

The residual fracturing fluid after fracturing operation from Shengli Oilfield is characterized by high COD， viscosity and turbidity. Gel breaking-coagulation-advanced oxidation process has been used for treating the residual fracturing fluid. The gel-breaker，inorganic coagulants，organic flocculants，which have excellent characteristics，and advanced oxidation system have been screened out and the optimum experimental conditions ascertained. Finally， the indoor treatment formula of residual fracturing fluid of Shengli Oilfield is obtained. The optimized dosages per 100 mL residual fracturing fluid are as follows：0.5 g of JPC， 0.25 g of polyaluminum， 3 mL of polyacrylamide solution，and 5 mL of Fenton reagent〔n(FeSO₄?7H₂O) ∶ n(H₂O₂)=8∶1〕. The indoor experiment results indicate that the pollutants in the treated residual fracturing fluid have dropped significantly. Except COD，all other pollutants are much lower than these of the second class of Standard GB 8978—1996.

Key words: residual fracturing fluid, gel breaking, flocculation, advanced oxidation

摘要：

胜利油田压裂作业后产生的残余压裂液具有COD、黏度、浊度高的特点，采用破胶—絮凝—深度氧化法来处理残余压裂液．筛选出性能优良的破胶剂、无机混凝剂、有机絮凝剂和深度氧化体系并确定最佳实验条件，最终得到胜利油田残余压裂液室内处理配方:每100 mL残余压裂液需加破胶剂JPC 0.5 g、聚铝0.25 g、聚丙烯酰胺溶液3 mL、5 mL Fenton试剂〔n(FeSO₄.7H₂O)∶n(H₂O₂)=8∶1〕．室内实验结果表明:处理后残余压裂液的各项污染物大幅下降，除COD外，其余污染物含量已经远低于GB 8978—1996的Ⅱ级排放标准．

关键词: 残余压裂液, 破胶, 絮凝, 深度氧化

CLC Number: 

• X703