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压裂液和地层组成共同影响着页岩气压裂返排液的污染组成,导致返排液成分复杂,处理难度大。为了能选择合理的水处理方法,对国内、外返排液的主要参数进行了对比,对国外返排液中的金属元素和有机污染物组成等进行了分析,发现国内对金属元素和有机污染物组成可供参考的资料很缺乏。目前国外对于压裂返排液主要有2种资源化处理方法:循环利用和处理再利用。金属离子、盐份、细菌和有机物是返排液处理的重难点。针对不同的处理方法和不同的特征污染物,对现行的处理技术进行了分析。指出现行的主要处理工艺虽能使水质达到相关标准,但存在结垢、膜污染、成本高等问题。提出要从源头优化压裂技术,在末端加强水处理工艺,最大程度地实现压裂返排液的资源化。
The fracturing fluid and formation composition affect the pollution composition of shale gas fracturing return fluid, resulting in the complex composition of the return fluid, which is difficult to handle. In order to choose a reasonable method of water treatment, the main parameters of domestic and foreign return fluids were compared. The metal elements and organic pollutants in the return fluid from abroad were analyzed. It was found that domestic metal elements and organic pollution Material composition for reference is lacking. At present, there are mainly two kinds of resource treatment methods for fracturing backflow: recycling and treatment and reuse. Metal ions, salts, bacteria and organic matter is the heavy difficulty of the back-drainage treatment. For different treatment methods and different characteristic pollutants, the current treatment technology is analyzed. Pointed out that although the current main treatment process can make the water quality meet the relevant standards, but there are fouling, membrane fouling, high cost and other issues. It is proposed to optimize the fracturing technology from the source and strengthen the water treatment technology at the end so as to maximize the resource utilization of the fracturing fluid.