In response to conventional viscosifiers exhibiting poor performance under high temperature and high salt conditions rendering them ineffective for high-temperature deep reservoirs,this study prepared a novel nanocomposite(E-APNC)via in situ polymerization using 2-acrylamido-2-methylpropanesulfonic acid,N,N diethylacrylamide,N,N methylenebisacrylamide and nano-SiO2 particles(E-np)as raw materials.E-APNC synthetic condition was optimized by orthogonal experimentation,and the molecular structure of E-APNC was evidenced by FT-IR,E-APNC polymer fluid displayed good thickening performance at high temperatures with excellent rheological parameter such as viscosity increase,shear resistance,thermal stability,and salt tolerance.Through the 24 h static experiment,E-np has better dispersibility compared with nps and N-np.At 1%E-APNC,the apparent viscosity at room temperature reached 66 mPa·s,whereas the viscosity shear rate reached 60 mPa·s at high shear rate of 1021 s-1,showcasing the excellent viscosity increasing ability and good anti-shear performance of E-APNC.The apparent viscosity retention rate of the drilling fluid was 65%after aging at 200℃for 16 h under 20%NaCl concentration probing its good temperature and salt resistance performance.Compared with polymer APNC and N-APNC,E-APNC showed strong shear resistance and good temperature resistance,salt resistance.
Composite materialSiO2 modificationViscosifierTemperature and salt tolerant
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