Black-Oil Simulations for Three-Component, Three-Phase Flow in Fractured Porous Media
Black-Oil Simulations for Three-Component, Three-Phase Flow in Fractured Porous Media
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DOI：
10.2118/107485-pa
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发表时间：
2009-06
期刊：
影响因子：
3.6
通讯作者：
S. Geiger;S. Matthäi;J. Niessner;R. Helmig
中科院分区：
文献类型：
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作者：
S. Geiger;S. Matthäi;J. Niessner;R. Helmig
在裂缝性油藏的真实表示中，离散裂缝建模和两相流模拟现在可以用于提高采收率和提高采收率策略的设计。然而，到目前为止，离散的裂缝模拟器没有包括第三个可压缩的气相。这阻碍了裂缝性油藏气体重力排水、水交替注气和排污动态的研究。在这里，我们提出了一种新的数值方法，它从三个方面扩展了现有的三组分三相流Black-Oil模型的能力：(I)采用推广到非结构混合单元网格的有限元-有限体积离散。(Ii)它采用了通量项的高阶精确表示。(Iii)使用改进的状态方程进行闪光计算，从而能够更真实地处理相行为。我们在几个应用中说明了这种数值方法的稳健性。首先，使用准一维模拟来演示网格的收敛。然后，用二维离散裂缝模型来说明网格质量对离散裂缝模型预测产量的影响。最后，用该方法模拟了英国布里斯托尔海峡石灰岩裂隙的二维真实模型和随机生成的三维离散裂隙模型中的三组分三相流动。
Discrete-fracture modeling and simulation of two-phase flow in realistic representations of fractured reservoirs can now be used for the design of IOR and EOR strategies. Thus far, however, discrete fracture simulators fail to include a third compressible gaseous phase. This hinders the investigation of the performance of gas-gravity drainage, water alternating gas injection, and blow-down in fractured reservoirs. Here we present a new numerical method that expands the capabilities of existing Black-Oil models for threecomponent – three-phase flow in three ways: (i) It utilizes a finite element - finite volume discretization generalized to unstructured hybrid element meshes. (ii) It employs higher-order accurate representations of the flux terms. (iii) Flash calculations are carried out with an improved equation of state allowing for a more realistic treatment of phase behavior. We illustrate the robustness of this numerical method in several applications. First, quasi-1D simulations are used to demonstrate grid convergence. Then, 2D discrete fracture models are employed to illustrate the impact of mesh quality on predicted production rates in discrete fracture models. Finally, the proposed method is used to simulate three-component – three-phase flow in a realistic 2D model of fractured limestone mapped in the Bristol Channel, U.K. and a 3D stochastically generated discrete fracture model.