针对水驱油藏非均质储层层间窜流干扰问题,设计了多层非均质长岩心物理模型,运用阿尔奇方法计算各级渗透率岩心组沿程饱和度分布,模拟研究多层水驱生产特征及层间窜流规律,通过末端岩心饱和度变化确定窜流程度,对比不同非均质性条件下层间窜流程度的差异。结果表明:逐层启动开发方式下,层间窜流程度大幅降低,其采收率较多层并行合采提高4.12个百分点;多层并行合采时,层间渗透率差异导致的层间压力梯度会引发中低渗层向高渗层的窜流倒灌现象,层间非均质性越强,窜流现象越严重,采收率越低。“逐层合采”的开采方法可有效提高多层非均质油藏的采收率。研究成果为开发方案的制订提供了借鉴。
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.
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