摘要
针对特低渗透多层油藏的层间非均质性和流体的非线性渗流特征,采用天然露头平板大模型并联驱替的物理模拟方法和非线性渗流数值模拟软件,对特低渗透多层油藏合采的开发效果进行研究。结果表明,特低渗透油藏多层合采时的总体采出程度与渗透率级差、平均渗透率、开发层数和地层油粘度均有关系。渗透率级差越大,总体采出程度越低,相对高渗层与相对低渗层的采出程度差值越大;平均渗透率越高,总体采出程度越高;开发层数越多,地层油粘度越大,多层合采时的开发效果越差。在此基础上,提出了"四元综合影响因子"的概念来评价多层合采的开发界限。计算分析表明,多层合采的综合采出程度与四元综合影响因子呈幂函数递减关系,"四元综合影响因子"可以作为评价多层油藏开发效果的重要指标。
Considering the vertical heterogeneity characteristics of multilayer reservoirs and nonlinear seepage regularity for fluid flowing in the ultra-low permeability reservoirs,natural large-scale outcrop model and nonlinear seepage numerical simulation software were adopted to research the development effect of commingled production for ultra-low permeability reservoirs. Results show that total recovery percent is influenced by permeability ratio,average permeability,layer number and oil viscosity during commingled production. With the increase of permeability ratio,the total recovery percent decreases and the difference between the higher and the lower permeability layers becomes larger; And the higher the average permeability is,the higher total recovery percent is; the more the layer number is and the higher the oil viscosity is,the poorer the develoipment effect is during commingled production. On this basis,a new parameter called ＂quadelement synthetic influence factor＂is proposed to evaluate the development boundary for the commingled production of multilayer reservoir. Analysis indicates that the total recovery percent is in a power function relationship with this new parameter,which could be used as an important indicator for development effect evaluation of ultra-low permeability multilayer reservoir.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2015年第6期1016-1021,共6页
Oil & Gas Geology
基金
国家油气重大专项(2011ZX0513-006)
关键词
四元综合影响因子
非线性渗流
数值模拟
物理模拟
多层油藏
特低渗透油藏
quad-element synthetic influence factor
nonlinear seepage
numerical simulation
physical simulation
multilayer reservoir
ultra-low permeability reservoir
