A new type of slick water fracturing fluid system based on back drainage

China' s shale oil and gas generally adopts large-scale volumetric fracturing, which has a large amount of liquid return-ing, and is difficult to handle and costly. In order to realize the recycling of back-drainage, research and development or optimization of drag reducer, drainage aid and shale inhibitor have formed a new type of slick water fracturing fluid system: 0.1% JHFR drag reducer +0.2% JHJZ Discharge +0.25% JHNW shale inhibitor. Indoor research shows that the system is green, 20s instant, with a drag reduction of 70%, high salt resistance and good backwater compatibility. The research results have been successfully applied in three horizontal wells of Changning H7 platform, which can meet the fracturing requirements of continuous mixing on site, save water resources and have significant drag reduction effect.