关键词: 中深层页岩气；一剂多能；可变黏压裂液；强携砂；现场应用 

Abstract: In order to change the conventional fracturing fluid for mid-deep shale gas wells with high sand pumping pressure, low sand content, easy sand plugging in fractured reservoirs, complex viscosity-changing procedures, and poor timeliness, a targeted polymerization method was developed. Multifunctional drag reducer, by changing the concentration of the drag reducer, it can realize the online free conversion of slippery water, linear glue, and cross-linking liquid ( adding cross-linking agent) , and evaluate its performance experiment. Under the same viscosity, variable viscosity multi-functional fracturing Compared with conventional slick water, the resistance reduction rate of liquid is increased by 7 percentage points, the sand carrying distance is increased by 30% , and the damage rate is 47. 2% of the conventional; its cross-linking fluid still has good sand carrying performance at 180℃ , and is used in deep shale gas wells. Under the same conditions, the pump pressure is about 10MPa lower than that of conventional fracturing fluids, the maximum sand content is 5. 56t, and the maximum sand concentration is 260kg /m3, setting a record of sand filling in deep shale gas wells; 65 wells have been promoted and applied with average single well testing The daily gas production volume is 31 . 6 × 104m3 , and the variable viscosity multifunctional fracturing fluid provides liquid technical support for the economic and efficient development of medium and deep shale gas wells.