Abstract: Due to low viscosity of crude oil and large permeability difference of reservoir, the interlayer interference problem during multi-layer commingling production in thin bedded light oil reservoirs is different from that of heavy oil reservoir. In order to understand the law of this problem and the production strategy can be reasonably formulated, the reservoir porosity and permeability data were made statistic analysis, and the displacement characteristics of single and commingling production under experimental conditions were studied by using two-tube parallel constant-speed displacement experiments with long cores with different permeabilities. The experimental results show that the increasing trend of water content during the displacement of oil by water in cores with different permeabilities is similar, but different from that of heavy oil. The greater the permeability difference, the more serious the interlayer interference. From the seepage mechanism, the influence law of permeability difference on interlayer interference is clarified, providing the theoretical foundation for the dividing and adjustment of reservoir.

Key words: light oil, multi-layer commingling production, permeability difference, interlayer interference