It is difficult to significantly enhance oil recovery of reservoirs with high water-cut at late production period.This paper presents a successful example to demonstrate the effectiveness of integrating well pattern rearrangement with binary combination flooding in Shuanghe oilfield.Based on the overlap of pay zones and differences of their petrophysical properties

as well as the large vertical production performance variation from one pay zone to the another

we rearranged the well pattern through layer series subdivision and recombination in similarity principle

adjusted injection & production system and designed horizontal infill wells.According to the characteristics of the reservoirs and balancing economic benefits

binary combination flooding was carried out in the major pay zones while water flooding adjustment was performed in the other non-major pay zones.The injection parameters of binary combination flooding were optimized by using the orthogonal design method.Study results indicate that this technique can improve the recovery factor greatly

with amplitude of 2.19[WTXT]%[WTBZ] higher than the sum of well pattern rearrangement and binary combination flooding.