关键词: 水驱, 多层非均质, 层间窜流, 窜流特征, 沿程饱和度, 逐层开启合采, 阿尔奇方法

Abstract: Aiming at the problem of interlayer channeling interference in water flooding heterogeneous reservoirs, a physical model of heterogeneous long core with multiple layers was designed. The along-way saturation distribution of core group with various permeabilities was calculated using Archie's method. The producing characteristics and interlayer channeling law of multiple layers with water flooding were simulated. The channeling degree was determined by the saturation change at the core end, and interlayer channeling differences under different heterogeneity conditions were compared. The results show that: under the layer-by-layer development mode, the interlayer channeling degree is greatly reduced, with increasement of recovery rate by 4.12 percentage points compared with commingled producing of multiple layers. In commingled producing of multiple layers, the interlayer pressure gradient caused by interlayer permeability differences would lead to channeling or backflow from low-permeability layers to high-permeability layers. The stronger the interlayer heterogeneity, the more serious the channeling, and the lower the recovery rate. The "layer-by-layer commingled producing " method can effectively improve the recovery of multi-layer heterogeneous reservoirs. The research results provide a reference for the formulation of the development plan.

Key words: water flooding, multi-layer heterogeneity, interlayer channeling, channeling characteristic, along-way saturation, layer-by-layer commingled producing, Archie method