针对目前水基压裂返排液重复利用效率低的问题,本文以一种疏水缔合聚合物BT1218为稠化剂,十二烷基苯磺酸三乙醇胺盐为黏度促进剂FJ-1、Na2CO3为pH调节剂、KCl为黏土防膨剂、氨基磺酸与过硫酸盐为复合破胶剂,制备了一种可重复使用的水基压裂液RFrac-H,同时利用RFrac-H破胶液制备了新的压裂液,并对其耐温、耐剪切性和破胶性能进行了评价。实验表明：0.4%BT1218+0.1% Na2CO3+0.5%KCl+0.30% FJ-1制备的RFrac-H压裂液,在170s-1下,温度由30℃升至120℃时,压裂液的黏度大于50mPa.s,在100℃、170s-1下,压裂液连续剪切60min后黏度大于40mPa.s,静态的悬砂速率为0.0214cm/s,破胶液的黏度为2.512mPa.s, 表面张力为24.4mN/m, 界面张力为0.282mN/m, 黏土防膨率大于80%。RFrac-H破胶液重复利用实验表明：利用RFrac-H破胶液制备的压裂液性能完全满足压裂液性能指标要求,且破胶液重复使用次数越多,压裂液制备成本越低。利用破胶液制备的压裂液与RFrac-H比较,增稠剂减少了75%以上,黏度促进剂减少了70%以上。
Aiming at the current problem of low reuse efficiency of water-based fracturing flowback fluid, this article uses a hydrophobic associative polymer BT1218 as a thickener, and dodecylbenzenesulfonic acid triethanolamine salt as a viscosity accelerator FJ-1, Na2CO3 as a pH adjuster, KCl as a clay anti-swelling agent, sulfamic acid and persulfate as a composite breaker, and a reusable water-based fracturing fluid RFrac-H is prepared, and RFrac-H gel breaker is also used A new fracturing fluid was prepared, and its temperature resistance, shear resistance and gel breaking performance were evaluated. Experiments show that: 0.4%BT1218+0.1% Na2CO3+0.5%KCl+0.30% FJ-1 RFrac-H fracturing fluid, when the temperature rises from 30℃ to 120℃ under 170s-1, the viscosity of fracturing fluid More than 50mPa.s, at 100℃, 170s-1, the viscosity of the fracturing fluid after continuous shearing for 60min is greater than 40mPa.s, the static sand suspension rate is 0.0214cm/s, and the viscosity of the breaker fluid is 2.512mPa.s, The surface tension is 24.4mN/m, the interfacial tension is 0.282mN/m, and the clay anti-swelling rate is greater than 80%. The repeated use experiment of RFrac-H breaker fluid shows that the performance of the fracturing fluid prepared with RFrac-H breaker completely meets the requirements of fracturing fluid performance indicators, and the more times the breaker is reused, the lower the fracturing fluid preparation cost. Compared with RFrac-H, the fracturing fluid prepared by using breaker fluid has a reduction of more than 75% in thickener and more than 70% in viscosity accelerator.