塔里木盆地河道砂油藏属于超深高温高盐油藏,储层非均质性强,注入水易沿物性较好的河道中央窜进。针对该问题,利用可视化微观模型与非均质长岩心模型开展膨胀乳液调驱物理模拟研究,分析调驱特征与机理,优选调驱参数与段塞组合方式,并进行了现场应用。结果表明:河道砂油藏水驱后剩余油分布类型主要包括多分支式簇状、并联式喉道状、角隅式凹状、分散式孤滴状、连片式成块状等类型。膨胀乳液的调驱机理为深部运移+增黏提压、膨胀封堵+变形运移、剥离油膜+推拉拖拽。优化调驱参数为:注入量为0.30倍孔隙体积,质量分数为8%,乳液粒径为微米级,注入速度为0.52 mL/min,注入段塞组合为0.15倍孔隙体积小粒径乳液颗粒+0.15倍孔隙体积大粒径乳液颗粒。现场应用表明调驱效果显著,调驱井组日产油量最高升至26.4 t,含水率最低降至32.1%。该研究成果对具有强非均质性的超深高温高盐河道砂油藏剩余油挖潜具有重要意义。
The channel sand reservoirs in the Tarim Basin are categorized as ultra-deep,high-temperature,and high-salt reservoirs,characterized by strong reservoir heterogeneity.Injected water tends to channel along the central part of the channel with better physical properties.To address this issue,physical simulation studies on swelling emulsion flooding were conducted using visualized micro-models and heterogeneous long-core models.The study analyzed the characteristics and mechanisms of flooding,optimized the flooding parameters and slug combination methods,and implemented in-situ applications.The results indicate that the remaining oil distribution types after water flooding in channel sand reservoirs mainly include multi-branch cluster,parallel throat,corner concave,dispersed isolated droplet,and contiguous blocky types.The flooding mechanism of the swelling emulsion involves deep migration+viscosity increase and pressure enhancement,swelling plugging+deformation migration and stripping oil film+push-pull dragging.The optimized flooding parameters are as follows:injection volume is 0.30 times the pore volume,mass fraction is 8%,emulsion particle size is in the micrometer range,injection rate is 0.52 mL/min,and the injection slug combination is 0.15 times the pore volume of small-particle-size lotion particles+0.15 times the pore volume of large-particle-size emulsion particles.In-situ applications demonstrate significant flooding effects,with the daily oil production of the flooding well group increasing to a maximum of 26.4 t and the water content decreasing to a minimum of 32.1%.The research achievement is of great significance for tapping the remaining oil potential in ultra-deep,high-temperature,high-salt channel sand reservoirs with strong heterogeneity.
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