Research and Application of FHG Fracturing Fluid

In order to meet the requirements of continuously mixing fracturing fluid of volume fracturing for horizontal wells and alleviate the shortage of HPG, the paper studied the FHG fracturing fluid. Through the fineness classification and surface treatment of guar gum, it could quickly disperse and hydrate, and replaced the conventional quick soluble HPG, which provided a new path for the fracturing fluid system of volume fracturing for horizontal wells. In this paper, the matching bactericide was optimized, the stability of fracturing fluid was increased by 70% in 72 hours; the matching crosslinking agent was prepared, which could effectively reduce the concentration of thickener, solved the problems of high viscosity of base fluid, fast crosslinking speed of gel, high residue content, and improved the sand mixing state, construction friction and reservoir damage.The results showed that swelling rate of FHG fracturing fluid was more than 90% in 3 minutes, viscosity retention rate of 72 h base fluid is over 85%, the viscosity reached 200 mPa·s after shearing for 1 hour at 120 ℃and 170 s^-1, and the residue content after breaking was less than 400 mg·L^-1, which could be applied to fracturing operation at 30-120℃. The fracturing fluid had been used in 5 horizontal wells of Xinjiang Oilfield, and the effect of operation and production was good.