疏水性纳米SiO2增注剂的降压作用机理

根据最新的纳米点阵滑移效应,提出疏水性纳米SiO2降压增注剂的作用机理。疏水性纳米颗粒吸附在地层孔道表面,取代水化层,形成纳米层,使孔壁表面体现为强疏水性,导致水流产生了水流滑移效应,较大幅度的降低了流动阻力,从而提高了水流速度。通过润湿性变化、吸附电镜扫描等系列实验,证明了岩石微孔道中产生纳米滑移效应的可能性。流动试验结果表明,经纳米流体处理后,岩石的水相渗透率大幅提高,平均达到47%。

Pressure Drop Mechanism of Enhancing Water Injection Technology with Hydrophobicity Nanometer SiO2

According to the new slippage effect on nanopatterned interfaces,the pressure drop mechanisms of enhancing water injection technology with hydrophobicity nanometer SiO2 were put forward. When hydrophobicity nanoparticles were adsorbed on surface of porous walls,nanoparticles layer was formed instead of hydrated layer. Wettability of pore wall then became strongly hydrophobicity from hydrophilicity,and slip effects on nanoparticles layer happened,it decreases the flow resistance obviously and makes fluid velocity obviously faster. Experiments of changing wettability of porous walls were done, and the facts that porous walls surface were absorbed by nanoparticles was validated under SEM. The results of flow experiment show water-phase permeability were increased about 47 percent averagely after treatment by nanofluid.