摘要：Reservoir heterogeneity is the main factor which affects the water-injection development effect in low-permeability reservoirs. A comprehensive study has been taken on the influence of reservoir interlayer and plane heterogeneity upon water flooding development effect through the waterflooding experiment of laboratory core, combined with the actual well group distribution and production performance. Starting with the producing boundary of the multi-layer reservoirs, the waterflooding performance was discussed, the sweep- coefficient and oil-recovery speed index were evaluated. The results show that the difference of water- injection mode is the key to the heterogeneity of heterogeneous reservoirs. The producing degree of low-permeability layers has been significantly improved in plugging the high-permeability layers. The waterflood front for experimental well group shows that the main directions are southwest and north-south. After one year of water flooding development, the front edge can first reach to Well J5. In the next displacement process, the waterflood front can reach to Wells J3, J8, J9 after five years. When water breakthrough occurred in core, the oil recovery rate decreased rapidly, especially in high- permeability layer core. The average sweeping- coefficient of core from medium-low permeability layers was 0.2, and the remaining oil was abundant. This study has a valuable reference significance for improving oil and gas recovery in low permeability reservoirs.
