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稠油油藏蒸汽驱开发过程中存在蒸汽窜流及蒸汽超覆等现象,大幅降低了蒸汽的利用率,影响了蒸汽驱开发效果。利用二维平板可视化物理模拟装置,分析稠油油藏注蒸汽开发过程中的汽窜现象以及泡沫封堵性能与改善微观波及体积的效果。研究表明:稠油油藏注蒸汽过程中,注采井间容易形成窜流通道;蒸汽在油层中产生明显的黏性指进,降低有效波及系数,窜流通道两侧滞留大量的剩余油;注入的泡沫流体进入并存在于窜流通道内,由于叠加的贾敏效应对窜流通道具有较好的封堵作用,使注入蒸汽及冷凝水进入含油饱和度较高的未波及区域,进一步驱替油藏内的剩余油。蒸汽驱开发的最终采收率为 48.48%,热力泡沫辅助蒸汽驱的最终采收率可达到 59.95%,最终采收率明显提高。该研究为稠油油藏蒸汽驱开发提供了借鉴。
The phenomena of steam channeling and steam overheating exist during the steam flooding development of heavy oil reservoirs, greatly reducing the utilization rate of steam and affecting the development effect of steam flooding. The two-dimensional flat-panel visualization physical simulation device is used to analyze the steam escape phenomenon and the foam plugging performance and the effect of improving the microscopic wave volume in the development of heavy oil reservoirs. The research shows that during the process of steam injection in heavy oil reservoirs, channeling channels are easily formed between injection and production wells. Steam has obvious viscous indexing in the oil layer and the effective wave coefficient is reduced. Large amounts of residual oil are trapped on both sides of the channeling channel. The injected foam fluid enters and exists in the channeling channel. Due to the superimposed Jia-Min effect, the channeling channel has a good sealing effect, so that the injected steam and condensed water enter the area with higher oil saturation and further displace the oil The remaining oil in the possession. The final recovery rate of steam flooding development is 48.48%. The final recovery rate of thermal foam assisted steam flooding can reach 59.95%, and the ultimate recovery ratio increases obviously. This study provides a reference for the development of steam flooding in heavy oil reservoirs.