碳酸盐岩缝洞型油藏氮气泡沫驱提高采收率机理可视化研究  

Laboratory research on nitrogen foam injection in fracture-vuggy reservoir for enhanced oil recovery

作　　者：李海波 侯吉瑞[1,2,3] 李巍 苑登御 张丽[1,2,3] 姜瑜 苑玉静 

机构地区：[1]中国石油大学(北京)提高采收率研究院,北京102249 [2]中国石油三次采油重点实验室低渗油田提高采收率应用基础理论研究室,北京102249 [3]中国石油大学(北京)教育部油田开发重点实验室,北京102249

出　　处：《油气地质与采收率》2014年第4期93-96,106,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"碳酸盐岩缝洞型油藏提高采收率基础研究--提高采收率方法研究及优化"(2011CB201006);国家科技重大专项"缝洞型碳酸盐岩油藏提高开发效果技术--补充能量注入体系优选实验研究"(2011ZX05014-003)

摘　　要：为了探索塔河油田碳酸盐岩缝洞型油藏水驱开发后期提高采收率技术,设计并制作了满足相似性条件的宏观可视化物理模型,在此基础上,对比研究了缝洞型油藏底水驱后氮气驱与氮气泡沫驱开采剩余油效果及提高采收率机理。实验结果表明:底水驱后,剩余油主要以阁楼油的形式存在于高部位溶洞以及局部构造高部位;底水驱后氮气驱与氮气泡沫驱可分别提高采收率30.44%和39.10%;氮气驱提高采收率机理主要是通过氮气与原油的重力分异作用顶替阁楼油,但氮气的高流度同时也使得氮气驱易发生气窜;氮气泡沫驱则在氮气驱提高采收率的基础上,通过泡沫对气体的流度控制和阻力效应,抑制气窜,进一步扩大气体的波及体积,同时,氮气泡沫驱具有更高的洗油效率,从而得到比氮气驱更好的提高采收率效果。A visualized physical model was designed according to the similarity theory.The remaining oil development effects of nitrogen gas injection and nitrogen foam injection after bottom water driving were studied comparatively and EOR mechanisms for nitrogen foam flooding was analyzed through physical simulation.Experimental results illustrate that the remaining oil exists as the 'attic oil' after bottom water driving.Both the nitrogen gas injection and nitrogen foam injection can displace remaining oil effectively.However,the foam flooding can enhance sweep efficiency through the effect of mobility control and plugging,adding that foam has a higher displacement efficiency in swept region,which leads to a higher ultimate recovery than gas injection.The experiments show a possible way to tap remaining oil and enhance oil recovery for the carbonate fracture-vuggy reservoir after bottom water driving.

关 键 词：缝洞型油藏 可视化物理模型 氮气驱 氮气泡沫驱 提高采收率 塔河油田 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]