文章基本信息

标题：Numerical Simulation of CO2-N2 Combination Flooding in Low Permeability-Ultra Low Permeability Homogeneous Reservoir
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作者：Chen Taoping ; Bi Jiaqi ; Zhao Bin 等
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：242
期号：2
页码：1-8
DOI：10.1088/1755-1315/242/2/022035
出版社：IOP Publishing
摘要：For low permeability, ultra-low permeability reservoir, the CO₂ preslug + N₂ flooding, using CMG numerical simulation software, the ideal homogeneous model which permeability is 3×10⁻³ μm² has been established. The recovery of CO₂ flooding under the 11 length-thickness ratios was calculated; the effects of 7 kinds of flooding slug combinations and 4 kinds of permeability on recovery with input-output ratio were analyzed; factors such as length-thickness ratio, permeability and injection slug combination affecting flooding effective were studied deeply. The result shows that: when the length-thickness ratio under the 100, as the increasing of the length-thickness ratio of the model, the oil recovery increased. When the length-thickness ratio reaches to 100, the oil recovery tends to be stabled, that is, when the single oil layer thickness less than 1% of the well spacing, it is more benefit to improve the oil recovery. As the permeability increases, the compound flooding recovery will decrease when the CO₂ injection (PV) is a constant and the CO₂ slug requires for the combination flooding to achieve the ultimate recovery increases, that is, the lower the permeability is, the more favorable it is for the CO₂-N₂ combination flooding. In actual oil reservoirs with a lengthen-thickness ratio of 30, the slug composition of CO₂-N₂ compound flooding should adopt the way of 0.3 PV CO₂ slug + subsequent N₂.