An efficient embedded discrete-fracture model for 2D anisotropic reservoir simulation

An efficient embedded discrete-fracture model for 2D anisotropic reservoir simulation
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用于二维各向异性油藏模拟的高效嵌入式离散裂缝模型

DOI:
10.1016/j.petrol.2018.11.004
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发表时间:
2019-03
影响因子:
--
通讯作者:
Rao Xiang
Rao Xiang
中科院分区:
工程技术2区
文献类型:
--
作者:
Cao Renyi;Fang Sidong;Jia Pin;Cheng Linsong;Rao Xiang

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在这项研究中,我们提出了一个嵌入式离散裂缝模型(EDFM)的内部油藏模拟器,结合了每个裂缝的效果与任意方向,长度和裂缝导流能力。本文采用边界元法求解局部网格与裂缝单元之间的流动,而不是采用线性流动近似,该方法考虑了局部网格的几何形状和边界压力对裂缝内流动的影响。该实现一般与现有的有限差分油藏模拟器兼容,并且EDFM的准确性通过比较裂缝流的分析/半分析模型、商业油藏模拟器中裂缝流的LGR模块和使用有限元方法的离散裂缝网络中的复杂裂缝流的结果来验证。网格敏感性的研究表明,新方法的收敛性。此外,多双翼裂缝和复杂裂缝系统的情况下,展示了鲁棒性,适用性和计算方便的新手方法模拟裂缝在各向异性油藏中的流动。
In this study, we present an embedded discrete fracture model (EDFM) for an in-house reservoir simulator that incorporates the effect of each fracture with arbitrary orientations, lengths and fracture conductivities. Instead of using the linear flow approximation for the EDFM, the interflows between local matrix grids and fracture elements are derived using boundary element method, which considers the effect of local grid geometry and boundary pressure on the flow into the fracture. The implementation is generally compatible with existing finite-difference reservoir simulators, and the accuracy of the EDFM is validated by comparing the results of analytical/semi-analytical models for fracture flow, LGR modules for fracture flow in commercial reservoir simulators and complex fracture flow in discrete fracture network using finite element method. A grid-sensitivity study is conducted to show the convergence of the new method. Moreover, the cases of multiple bi-wing fractures and complex fracture systems are presented to demonstrate the robustness, applicability and computational convenience of the novice approach for simulating the fracture flow in anisotropic reservoir.
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