ABSTRACT Polymer microspheres are profile‐control agents for plugging high‐permeability reservoir zones, regulating injection profiles, and enhancing oil recovery (EOR) owing to their small size and strong retention. However, most studies focus on spherical microspheres, whereas peanut‐shaped anisotropic particles remain rarely investigated. Herein, peanut‐shaped polystyrene (P‐PS) particles prepared through an optimized emulsion‐polymerization route reported in our previous work were evaluated