Technology of PPG/Polymer/Surfactant flooding is employed to enhance oil recovery in reservoirs after polymer flooding.This paper describes and analyzes the results of PPG/Polymer/Surfactant flooding in laboratory,and evaluates the plugging,profiling and flooding effects in the pilot test.The resistance factor,plugging efficiency,profile adjustment ability of the PPG is higher than that of poly-mer.The PPG/Polymer/Surfactant flooding system could enhance oil recovery after polymer flooding by 13.6% in labor...