缝洞型碳酸盐岩油藏氮气驱效果影响因素

发布时间：2019-06-14 03:22

【摘要】：缝洞型碳酸盐岩油藏以大型溶洞、溶蚀孔洞及裂缝为主要的储集空间,具有非均质性强、缝洞结构复杂的特点,气驱是该类油藏重要的开发方式之一。为探索缝洞型碳酸盐岩油藏气驱动态特征、驱油效果的影响因素及规律,建立二维典型缝洞可视化模型,研究不同类型剩余油启动效果,并结合氮气驱物理模拟驱油效果定量对比,分析氮气驱效果的影响因素。研究结果表明:氮气驱可进一步启动水驱未波及区域的剩余油;氮气驱效果及油、气、水流动特征受到溶洞充填方式、原油粘度和底水能量等因素影响,溶洞充填方式主要影响流体的渗流特征,在一定程度上有利于扩大氮气驱波及范围;原油粘度和底水能量影响氮气和底水的相互作用,改变压力场的分布;在强底水作用下,水窜更为明显,但能改善氮气驱效果,提高采收率。
[Abstract]:The main reservoir space of fracture-cave carbonate reservoir is large caverns, dissolution pores and fractures, which have the characteristics of strong heterogeneity and complex fracture structure. Gas flooding is one of the important development methods of this kind of reservoirs. In order to explore the gas driving state characteristics of fracture-cavity carbonate reservoir and the influencing factors and laws of oil displacement effect, a two-dimensional typical fracture-hole visualization model is established, and the start-up effect of different types of remaining oil is studied. Combined with the quantitative comparison of nitrogen flooding physical simulation oil displacement effect, the influencing factors of nitrogen flooding effect are analyzed. The results show that nitrogen flooding can further start the remaining oil in the unaffected area of water flooding, and the effect of nitrogen flooding and the characteristics of oil, gas and water flow are affected by cave filling mode, crude oil viscosity and bottom water energy, and the cave filling mode mainly affects the seepage characteristics of fluid, which is beneficial to expand the sweep range of nitrogen flooding to a certain extent. The viscosity of crude oil and the energy of bottom water affect the interaction between nitrogen and bottom water and change the distribution of pressure field. Under the action of strong bottom water, the water channeling is more obvious, but it can improve the effect of nitrogen flooding and improve the oil recovery.
【作者单位】：中国石油大学(北京)提高采收率研究院;中国石油大学(北京)石油工程教育部重点实验室;
【基金】：国家“973”计划“碳酸盐岩缝洞型油藏开采机理及提高采收率基础研究-缝洞型油藏提高采收率方法研究及优化”(2011CB20100603) 国家科技重大专项“碳酸盐岩油田开发关键技术-缝洞型碳酸盐岩油藏提高开发效果技术”(2011ZX05014-003)
【分类号】：TE357.45

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