摘要
目前,利用常规手段难以对低含油饱和度油水过渡带进行开采,利用气驱及化学驱方式开采仍具有开发潜力,但对于不同类型的油水过渡带,其开发机理不明确。开展4组天然岩心驱替实验,利用核磁共振技术研究不同类型油水过渡带中剩余油的启动机理和主要分布状态,在此基础上研究油水过渡带的开发特征。实验结果表明,气驱开发方式更适用于低渗岩心;化学驱的乳化及降低表面张力作用对小孔隙中剩余油有较好的动用程度,提高采收率效果显著。
At present,it is difficult to develop the oil-water transition zones with low oil saturation by conventional means and it still has development potential by gas flooding and chemical flooding,but the development mechanism for the different types of oil-water transition zones is still not clear.Four natural core displacement experiments were carried out.Nuclear magnetic resonance(NMR)technique was used to study the starting mechanism and main distribution of residual oil in different types of oil-water transition zones.On this basis,the development characteristics of oil-water transition zone were studied.The experimental results show that gas flooding is more suitable for low permeability cores.The chemical flooding has a good producing degree for the residual oil in small pore because of the emulsification and the reduction of surface tension,which can obviously enhance oil recovery.
作者
张振涛
姜汉桥
ZHANG Zhentao;JIANG Hanqiao(Dongsheng Jinggong Petroleum Development Group Co.,Ltd.,Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257500,China;College of Petroleum Engineering,China University of Petroleum,Beijing 102249,China)
出处
《石油地质与工程》
CAS
2019年第4期54-57,共4页
Petroleum Geology and Engineering
关键词
油水过渡带
剩余油
驱替实验
核磁共振
oil-water transition zones
residual oil
displacement experiment
nuclear magnetic resonance
