Preparation and performance of nano-SiO2-enhanced clean fracturing fluid
A long-chain amine oxide surfactant(EDAAO)was synthesized with erucamide propyl dimethylamine and H2O2 as raw materials,and a fracturing fluid system was formulated with EDAAO as the main agent.Nano-SiO2 particles were introduced into the system to prepare nano-SiO2-enhanced clean fracturing fluid.The rheology,sand-carrying capacity,gel-breaking performance,and other key indicators of the fracturing fluid were investigated through laboratory experiments.The results show that the optimum proportion of clean fracturing fluid is as follows:2.5%(w)EDAAO+0.8%(w)sodium salicylate+3.0%(w)KCl+0.1%(w)nano-SiO2,particle of SiO2 is 10 nm.The maximum temperature resistance of the obtained fracturing fluid is increased by 20%compared with the ordinary fracturing fluid,achieving a maximum temperature resistance of 120℃.Under 90℃and 170 s-1 for 1.5 h,the viscosity of the nano-SiO2-enhanced clean fracturing fluid can reach over 85 mPa·s,which is 2.43 times higher than that of fracturing fluids without nanoparticles.When kerosene is used as a gel breaker,if its dosage exceeds 2.0%(w),then the nano-SiO2-enhanced clean fracturing fluid can achieve gel breaking within 60 min,with the viscosity dropping below 5 mPa·s.The gel breaking of fracturing fluid has low damage characteristics and good compatibility with formation water,which meets the application requirements of clean fracturing fluids.
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