A modified projection-based embedded discrete fracture model (pEDFM) for practical and accurate numerical simulation of fractured reservoir

A modified projection-based embedded discrete fracture model (pEDFM) for practical and accurate numerical simulation of fractured reservoir
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一种改进的基于投影的嵌入式离散裂缝模型(pEDFM),用于裂缝性储层的实用和准确的数值模拟

DOI:
10.1016/j.petrol.2019.106852
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发表时间:
2020-04
影响因子:
--
通讯作者:
Du Xulin
Du Xulin
中科院分区:
工程技术2区
文献类型:
--
作者:
Rao Xiang;Cheng Linsong;Cao Renyi;Jia Pin;Liu Hao;Du Xulin

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pEDFM是近三年提出的一种新的数值模型,用于处理复杂裂隙网络的流动模拟。以往的工作表明,经典EDFM仅对多级压裂井的生产或注水模拟具有良好的性能,而pEDFM比EDFM能有效地处理更一般的情况。虽然pEDFM已经得到了一些工作的验证,但本文指出,pEDFM仍存在一些需要解决的局限性,如缺乏一种实用的投影面选择方法,对f-m连接的传递率公式不熟练,以及在某些情况下性能较差。针对这些局限性,提出了相应的修正方法,包括一种实用的投影面组合选择算法--“微平移法”、附加裂缝-矩阵(f-m)连接的物理传递率公式以及考虑附加裂缝-裂缝(f-f)连接的扩展pEDFM框架。最后通过测试实例说明了改进的必要性和有效性。此外,两个例子来说明修改后的pEDFM工作流程的裂缝性油藏的实际应用的鲁棒性。
pEDFM is a new numerical model which is proposed in the last three years to handle the flow simulation with complex fracture networks. Previous works show that classical EDFM has a good performance only for production or injection simulation of multistage fractured well, but pEDFM can effectively handle more general cases than EDFM. Although pEDFM has been validated by by some works, this paper points out that there are still some limitations in previous pEDFM need to be resolved, lying on lack of a practical method to select projected faces, the proficiency in the transmissibility formula of f-m connections, and poor performances in some cases. Then, corresponding modifications are presented to resolve these limitations, and these modifications include A practical algorithm called “micro-translation method” to select projected-faces combinations, the physical transmissibility formula of additional fracture-matrix (f-m) connections and an extended pEDFM framework by considering additional fracture-fracture (f-f) connections. Some test cases are implemented to illustrate the necessity and validity of these modifications. Besides, two examples are implemented to illustrate the robustness of the modified pEDFM workflow for practical application of a fractured reservoir.
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