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提出了纳米颗粒水基分散液的力学-化学双重减阻机制,并通过对比岩心切片吸附纳米颗粒前后以及冲刷前后的表面微结构、润湿性的变化,进行了实验验证.研究结果表明,经纳米颗粒水基分散液处理之后的岩心切片表面表现为强亲水性,并且存在一层致密的纳米颗粒吸附层;冲刷之后岩心切片表面的纳米颗粒吸附层依然存在,但其表面已逐渐转变为强/超疏水性,反映了纳米颗粒吸附层表面的表面活性剂被逐渐清洗干净.注水初期,主要表观为表面活性剂的化学减阻作用.随着注水过程的进行,主要体现为以疏水表面的滑移效应为主的力学减阻机制.岩心驱替实验结果表明,纳米颗粒水基分散液驱替后的岩心的水相渗透率平均提高幅度达84.3%,减阻效果显著,证实了纳米颗粒水基分散液的力学-化学双重减阻机制.
The mechano-chemical double drag reduction mechanism of nano-particles aqueous dispersion was proposed and the experimental verification was made by comparing the surface micro-structure and wettability before and after the nano-particles were adsorbed on the core slice.The results show that the The surface of the core slice after the aqueous nanoparticle dispersion treatment showed strong hydrophilicity and a dense nanoparticle adsorption layer existed. After the erosion, the nanoparticle adsorption layer remained on the core slice surface, but its surface had gradually changed to Strong / superhydrophobic, reflecting the surface of the nano-particles adsorbed surfactant was gradually cleaned.Firstly, the main surface water injection apparent chemical drag reduction.With the water injection process, mainly reflected in the hydrophobic Surface slip effect of the mechanical drag reduction mechanism.Core displacement test results show that the core of the water-based dispersion dispersion of nanoparticles after the water core permeability increased by an average of 84.3%, a significant drag reduction effect, confirmed that Mechano - chemical Double Drag Reduction Mechanism of Nanoparticle Water - based Dispersions.