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对于一维 4组分富化气驱 ,本文检验了在出现弥散混合情况下的相态和流动的相互作用。数值和分析解证明 ,混相能力最小富化 (MME)以上的气体富化可以大大提高采收率。采收率提高的幅度取决于弥散混合的程度以及两相区域的大小和形状。本文确定了混相能力最小富化以上的临界气体富化(CGE) ,CGE把多次接触混相区域分成了两个区域 :MCM1(此时气体在系线延展区域之内 )和MCM2(此时气体在系线延展区域之外 )。对于CGE以下的富化 (在MCM1区域内 ) ,采收率随着富化程度大幅度提高。对于在本文中所研究的情况 ,在CGE以上(在MCM2区域内 ) ,采收率对富化不那么敏感。在MCM1区域内的驱替显示了冷凝和汽化综合机理 ,而在MCM2区域内的驱替是纯冷凝机理
For a one-dimensional, four-component, rich gas drive, we examine the phase behavior and flow interactions in the presence of dispersive mixing. Numerical and analytical solutions demonstrate that gas enrichment above the minimum phase-enrichment (MME) can greatly enhance oil recovery. The magnitude of oil recovery depends on the degree of dispersion mixing and the size and shape of the two-phase zone. In this paper, the critical gas enrichment (CGE) above the minimum enrichment of miscible phase is determined. CGE divides the multiple mixed phase into two regions: MCM1 (in this case, the gas is within the extension of the system) and MCM2 Outside the line extension area). For enrichment below CGE (in the MCM1 region), the recovery rate increases dramatically with enrichment. For the case studied in this article, recovery above the CGE (in the MCM2 region) is less sensitive to enrichment. Displacement in the MCM1 region shows a general mechanism of condensation and vaporization whereas displacement in the MCM2 region is a pure condensation mechanism