纳米颗粒吸附界面对微孔喉中液滴运移及堵塞的调控

Droplet blockage in micropore throats in the late stage of reservoir development has an adverse effect on the actual oil production process. Nanoparticles adsorbed at the emulsion interface reduce interfacial tension and induce interfacial viscoelasticity. Understanding their role in regulating emulsion migration and blockage in micropore throats is of significant importance. This study uses microfluidic visualization experiments to investigate the influence of nanoparticles on droplet blockage during migration. By analyzing the relationships between droplet size, critical blockage flow rate, and critical blockage capillary number, the mechanism by which nanoparticle adsorption affects droplet blockage is elucidated. Specifically, the induced interfacial viscoelasticity exacerbates droplet blockage during migration. A mathematical model for the critical conditions of droplet blockage is derived using droplet equilibrium relations. By examining the phase diagram of droplet migration and blockage states, the critical transition conditions for blockage are determined, demonstrating that droplets are more readily captured and blocked in micro-pore throats due to nanoparticle adsorption at the interface.