缝洞型油藏泡沫辅助气驱提高采收率技术可行性  

Feasibility study on foam-assisted gas flooding EOR technology in karstic oil reservoir

作　　者：刘中春[1,2] 汪勇 侯吉瑞[3,4] 罗旻 郑泽宇[3,4] 屈鸣 朱道义[3,4] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油化工集团公司海相油气藏开发重点实验室,北京100083 [3]中国石油大学提高采收率研究院,北京102249 [4]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《中国石油大学学报（自然科学版）》2018年第1期113-118,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2016ZX05014-004)

摘　　要：根据缝洞型油藏特征,建立二维和三维可视化缝洞介质物理模型,研究水驱、气驱、泡沫驱在缝洞介质中的剩余油形成及驱替机制,对比分析泡沫驱在缝洞型介质适应性。利用三维高温高压缝洞模型评价泡沫驱实施效果。结果表明:泡沫辅助气驱能够显著改善缝洞型油藏气驱效果,在实验条件下,水驱后N2泡沫驱能够将气驱采收率提高7%,裂缝中泡沫的增黏作用和可变流动阻力效应使得其能够进一步扩大气驱波及体积,有效启动绕流油与封闭孔洞剩余油;泡沫辅助气驱作为碳酸盐岩缝洞型油藏三次采油技术是可行的。According to the characteristics of the karstic oil reservoir,the two-and three-dimensional visual physical model of karstic media were constructed to study the displacement mechanisms and the characteristics of remaining oil under water,gas and foam flooding,respectively.Then,the suitability of foam in fractured-cavity media was analyzed.Also the experimental implementation effect of foam-assisted gas flooding was evaluated through a high-pressure and high-temperature 3D model.The results show that the foam-assisted gas flooding can remarkably improve the gas flooding of karstic oil reservoir.It is also found that the N_2 foam flooding can increase the recovery of gas flooding by 7%.The viscosity increasing effect and the adjustable flow resistance would be the main mechanism for expanding swept efficiency,which are beneficial to displace the bypass oil and the remaining oil trapped in the closed fractures.Foam assisted gas flooding as an EOR technology in karstic carbonate reservoir is preliminary feasible.

关 键 词：缝洞型油藏 泡沫驱 波及效率 裂缝 剩余油 

分 类 号：TE347.46[石油与天然气工程—油气田开发工程]