摘要
为定量认识低渗透储层水驱开发中的贾敏效应,根据注水驱油理论,结合岩心水驱油物理模拟实验,建立表征贾敏效应动态变化的方法,开展不同渗透率岩心水驱贾敏效应对比实验。结果表明:岩心渗透率越低,贾敏系数越大,驱油效率越低,等效渗流截面越小;与常规中高渗透储层相比,低渗透储层高贾敏效应导致孔隙中剩余油分布特征和启动机制存在差异。降低贾敏效应是有效改善低渗透储层流体注入能力和提高采收率的技术手段之一,CO2驱能降低低渗透储层的注入压力,并大幅提高驱油效率,是有效提高水驱后低渗透率基质驱油效率的有效手段。
In order to quantitatively characterize the Jamin effect in the waterflooding development of low permeability reservoir,the dynamic Jamin effect was characterized and the comparative laboratory tests of Jamin effect in waterflooding were conducted based on the waterflooding theory and physical waterflooding simulation.Research indicates that the Jamin coefficient increases with the decrease of core permeability.The equivalent seepage cross-section area decreases with the decrease of oil displacement efficiency.Comparing with conventional medium-high permeability reservoirs,the high Jamin effect leads to differences in the remaining oil distribution and starting mechanism.Reducing the Jamin effect is considered as one of the technical means to effectively improve the fluid injection capacity and enhance oil recovery in low permeability reservoir.CO 2 flooding can reduce the injection pressure of low permeability reservoir and significantly improve the oil displacement efficiency,which is an effective means to efficiently improve the matrix oil displacement efficiency of low permeability reservoir after waterflooding.
作者
郑自刚
余光明
雷欣慧
张庆洲
Zheng Zigang;Yu Guangming;Lei Xinhui;Zhang Qingzhou(PetroChinaChangqing Oilfield Company,Xi′an,Shaanxi 710018,China;State Engineering Laboratory for Exploration and Development of Low Permeability Oil&Gas Fields,Xi′an,Shaanxi 710018,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2020年第3期142-147,共6页
Special Oil & Gas Reservoirs
基金
中国石油股份公司重大科技专项“特/超低渗油藏CO 2驱油与埋存油藏工程技术方法研究”(2014E-3602)
国家科技重大专项“大型油气田及煤层气开发”子课题“CO 2捕集、驱油与埋存技术示范工程”(2016ZX05056)。
关键词
贾敏效应
定量表征
有效流动截面
提高采收率
Jamin effect
quantitative characterization
effective flow cross-section
enhancing oil recovery
