Laboratory research of high temperature fracturing fluid in west Sichuan

Poor temperature resistance of west Sichuan fracturing fluid at present can't meet the need of deep reservoir reconstruc-tion. Starting from analyzing factors affecting temperature resistance of fracturing fluid, organic borate-zirconate compound cross-linker WD-51D was synthesized with high temperature resistance and adjustable cross-linking time. In addition, this paper developed a high temperature (140 ℃) fracturing fluid system by the introduction of temperature stabilizer YA-10. Experiments indicate that this fractur-ing fluid possesses the advantage of powerful temperature/shear (T/S) resistance (viscosity maintains above 100 mPa·s at 140 ℃ and 170 s-1 continuous shearing for 120 min), good filtrate reduction property (filtration coefficient of 7.49×10-4 m/min0.5), low formation damage ( 27.99%) and so on. This fracturing fluid can meet the requirement of deep reservoir reconstruction in west Sichuan, and has successfully applied in DaYi 2 well.