气水同注驱油技术提高采收率物理模拟  

Physical simulation of enhancing oil recovery by simultaneous water and gas injection flooding

作　　者：马云飞[1,2,3] 赵凤兰[1,2,3] 侯吉瑞[1,2,3] 端祥刚[1,2,3] 李实[4] 

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]石油工程教育部重点实验室,北京102249 [4]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2015年第5期89-93,98,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"油田开采后期提高采收率技术"(2011ZX05009-004);国家科技支撑计划"CO2埋存与提高采收率评价研究"(2012BAC26B02)

摘　　要：为了研究气水同注驱油技术扩大水驱波及体积提高采收率的适应性,通过室内驱油实验,评价了氮气-水和氮气-活性水2种体系作为驱油剂的驱油效果,并探讨了各自的渗透率适应界限和驱油机理.实验结果表明：当渗透率为5×10^-3-100×10^-3 μm^2时,氮气-水同注体系的流度降低因子随渗透率的增大而减小;当渗透率为5×10^-3-40×10^-3 μm2时,该体系可有效增大水驱波及效率,提高采出程度35.1%-16.8%.由于流度降低因子与采出程度增值匹配性良好,可将其作为表征气水同注体系扩大波及体积能力的重要指标之一.当渗透率为30×10^-3-500×10^-3 μm2时,氮气-活性水同注体系可有效增大渗流阻力,扩大波及体积,提高采出程度22.6%-19.4%.因此,氮气-水同注体系适用于渗透率小于40×10^-3 μm^2的地层,氮气-活性水同注体系适用于渗透率为30×10^-3-500×10^-3 μm^2的地层.Dynamic simulation experiments were operated so as to evaluate the recovery efficiency of the two types of simultaneous water and gas injection(SWAG)systems:the nitrogen-water system and the nitrogen-active water system. Their enhanced oil recovery mechanism and permeability adaptability were probed as well. The result suggests that the mobility reduction factor(MRF)of the nitrogen-water system reduces as permeability rises when it ranges from 5×10- 3to 100×10- 3μm2. The nitrogen-water system can enlarge swept volume and improve recovery efficiency by 35.1%-16.8% after water flooding in the scope of 5×10-3to 40×10-3μm2. MRF can be used as a criterion to evaluate the sweep efficiency enlarging ability of SWAG for it matches well with recovery degree. When permeability ranges from 30×10-3to 500×10-3μm2,the nitrogen-active water system can improve percolation resistance effectively and enhance recovery degree by 22.6%-19.4%after water flooding. Therefore,the nitrogen-water system can be adapted to the formation with permeability under 40×10-3μm2,whereas the nitrogen-active water system may be applied to the formation with the permeability between 30×10-3and500×10-3μm2.

关 键 词：气水同注 波及体积 流度降低因子 渗透率适应性提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]