Abstract: Aiming at the difficulty on residual oil potential tapping of offshore L oilfield with developed interlayers, through extracting typical geological parameters of well group, 6 kinds of interlayers distribution models of injection-production wells under 2 circumstances were respectively designed,namely the injection wells drilled interlayers alone and the production wells drilled interlayers alone.Towards each kind of interlayers, the water flooding and early polymer injection were carried out and a total of 12 two-dimensional visualization model experiments were completed. The experimental results showed that under the basic well network, the recovery was the highest when the relative length of the interval was2/3 of the well spacing. Two models should be given priority in the selection of polymer injection well group.More details can be seen in the paper.