摘要
超前注水技术可有效提高低渗透油藏的开发效果,但随着储层渗透率的增加,超前注水提高采收率幅度变缓,因此有必要研究超前注水适用的渗透率界限。利用低渗透X油田天然岩心开展室内实验,研究超前注水对岩心渗透率、孔隙结构、驱油效率等的影响。结合数值模拟分析超前注水对波及系数及采收率的影响,并对超前注水现场试验效果进行评价。结果表明,适合超前注水的储层渗透率界限为小于10 m D,对于低于该渗透率的储层,采取超前注水开发方式可获得较好的开发效果,采收率增幅明显。
The low permeability reservoir development effects can be effectively improved with the use of ad- vanced water injection technology. However, with the increase of reservoir permeability, the increasing value of re- covery tends to decline in advanced water injection. Therefore, it is necessary to study the permeability limits of ad- vanced water injection. The laboratory experiment was carried out by using the low permeability natural core in X oil field, and the changes of core permeability, pore structure and oil displacement efficiency in advanced water injec- tion were analyzed. Meanwhile, the changes of sweep efficiency were figured out and recovery in advanced water injection were figured out with numerical simulation method, and the results tested in the X oil field were evalua- ted. The results show that the permeability limits of advanced water injection is 10 mD, and better development effect and higher recovery can be obtained with advanced water injection technology for reservoirs of permeability less than this value.
出处
《科学技术与工程》
北大核心
2015年第23期32-36,共5页
Science Technology and Engineering
关键词
超前注水
渗透率界限
室内实验
数值模拟
现场试验
advanced water injection
permeability limits
laboratory experiment
numerical simula- tion
oilfield test
