超低渗透砂岩油藏微观渗流特征及驱油效率的影响因素

发布时间：2019-02-19 12:07

【摘要】：通过鄂尔多斯盆地超低渗透砂岩油藏油水相对渗透率测定和微观模型驱替实验,探讨超低渗透砂岩油藏微观渗流特征及驱油效率的影响因素.研究结果表明,超低渗透砂岩油藏储层相对渗透率曲线特征表现为:束缚水饱和度高,残余油饱和度高,驱油效率低,油水两相共渗区范围窄.随含水饱和度增加,油相相对渗透率急剧下降,水相相对渗透率上升缓慢,无因次采油指数和油井产量大幅度下降.超低渗透砂岩油藏微观驱替特征表现为:最终驱油效率低,随注入倍数增加,采收率和含水率增高.注入倍数为1~2 PV过程中采收率与含水率增加幅度较大;注入倍数在3~4 PV时,采收率和含水率增加幅度趋于平缓.超低渗透砂岩油藏影响驱油效率的因素可以分为反映油藏固有特征的内在因素和反映驱替条件的外在因素.
[Abstract]:Based on the oil-water relative permeability measurement and microscopic model displacement experiment of ultra-low permeability sandstone reservoir in Ordos Basin, this paper discusses the microscopic seepage characteristics of ultra-low permeability sandstone reservoir and the influencing factors of oil displacement efficiency. The results show that the relative permeability curve of ultra-low permeability sandstone reservoir is characterized by high irreducible water saturation, high residual oil saturation, low oil displacement efficiency and narrow range of oil-water two phase common permeability zone. With the increase of water saturation, the relative permeability of oil phase decreases sharply, the relative permeability of water phase increases slowly, and the dimensionless oil recovery index and oil well production decrease greatly. The micro-displacement characteristics of ultra-low permeability sandstone reservoirs are as follows: the final displacement efficiency is low and the oil recovery and water cut increase with the increase of injection multiple. The oil recovery factor and water cut increase greatly in the process of injecting 1 ~ 2 PV, and when the injection multiple is 3 ~ 4 PV, the increase range of oil recovery and water cut tends to be gentle. The factors affecting oil displacement efficiency in ultra-low permeability sandstone reservoirs can be divided into internal factors reflecting the inherent characteristics of reservoirs and external factors reflecting displacement conditions.
【作者单位】：中国石油长庆油田分公司勘探部;西北大学地质学系;
【基金】：中国石油科技创新基金项目(2015D-5006-0106) 国家自然科学基金(51104119)联合资助
【分类号】：TE312;TE357.6

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