The drag reduction characteristics of hydrophobic nanoparticles adsorption core surface and the prediction of slip lengths

The slip model of micro channel in reservoir adsorbed by hydrophobic nanoparticles(HNPs) was established. The drag reduction characteristics were verified by the core slice adsorption experiment and core displacement experiment respectively. Results show that a compact HNPs adsorption layer can be built on the surfaces of the micro channel and the wettability of the surfaces can be changed from hydrophilic into strong hydrophobic. The slip lengths were calculated according to the slip model, the results show that the core surfaces can produce a slippage ranging from 6.7nm to 87.1nm, with an average of 43.3nm.