【摘要】 以昭通页岩气示范区的A、B两种类型压裂返排液为研究对象,研究和优选了适用于压裂返排液的混凝剂和促凝剂,并考察了温度、沉降时间、pH值及表面活性剂对SS(固体悬浮物)去除效果的影响,为工程应用提供了较好的指导。结果表明:聚合氯化铝与聚丙烯酰胺1 600对两种类型压裂返排液均有良好的絮凝效果,对A型压裂返排液:聚合氯化铝和聚丙烯酰胺1 600浓度分别为400 mg/L和4 mg/L、温度为25℃、pH值为6～8、沉降30 min,SS去除率为98%;对B型压裂返排液:聚合氯化铝和聚丙烯酰胺1 600浓度分别为480 mg/L和12 mg/L、温度为25℃、pH值为6.5～8、沉降30 min,SS去除率为97%。细菌含量对压裂返排液SS去除率无显著影响。4种类型表面活性剂对絮凝效果的影响大小排序为:阴离子>非离子>两性≈阳离子。更多还原

【Abstract】 In this paper,two types of fracturing flowback fluids(type A and B)from Zhaotong shale gas demonstration area were studied.The coagulant and coagulant accelerator suitable were optimized,based on the effect from temperature,sedimentation time,pH value and surfactant on the removal efficiency of suspended solid,to provide a better guidance for engineering applications.The results showed that:polyaluminum chloride and polyacrylamide 1 600 performed good flocculation effect on the two types of fracturing flowback fluid.For the type A fluid,the removal rate could reach 98% with a concentration of polyaluminum chloride and polyacrylamide 1 600 as400 mg/L and 4 mg/L,temperature as 25 ℃,pH around 6-8,and sedimentation time as;for type B fracturing flowback fluid,the removal rate could reach 97% when polyaluminum chloride and polyacrylamide 1 600 was 480 mg/L and 12 mg/L,temperature of 25 ℃,pH around 6.5-8,and the sedimentation time of 30 min.The bacterial content had no significant effect on the removal rate of SS content in the fracturing flowback fluid.The ability of four types of surfactants to affect the flocculation effect:anion>nonionic>amphoteric≈cation.更多还原