An efficient three-dimensional embedded discrete fracture model for production simulation of multi-stage fractured horizontal well
An efficient three-dimensional embedded discrete fracture model for production simulation of multi-stage fractured horizontal well
复制标题
多级压裂水平井生产模拟的高效三维嵌入式离散裂缝模型
DOI：
10.1016/j.enganabound.2019.06.006
复制
发表时间：
2019-09-01
影响因子：
3.3
通讯作者：
Chen, Ying
中科院分区：
文献类型：
--
作者：
Rao, Xiang;Cheng, Linsong;Chen, Ying
针对多级压裂水平井的生产模拟问题，提出了一种高效的三维嵌入式离散裂缝模型。该模型适用于三维油藏中任意位置任意形状的垂直裂缝和倾斜裂缝。对瞬变流方程的边界积分方程组进行了处理，以逼近矩阵网格块与其包含的裂隙单元之间的传递通量，这种近似比原来的三维EDFM具有更高的精度。同时介绍了相应的裂隙形态刻画和任意多边形裂隙单元多重奇异积分的计算方法。通过三个算例验证了所提出的三维EDFM的有效性，与原始的三维EDFM相比，确实实现了对暂态效应的更准确的建模。在此基础上，通过两个复杂裂缝网络自然耗竭和倾斜椭圆形裂缝注水开发的算例，验证了三维EDFM在多级压裂水平井生产模拟中的性能和适用性。
In this paper, an efficient three-dimensional (3D) embedded discrete fracture model (EDFM) for production simulation of multistage fractured horizontal well is developed. The proposed model can be adaptive to vertical and inclined fractures with arbitrary shapes in any position of 3D reservoirs. The boundary integral equations of transient flow equations are handled to approximate the transfer flux between matrix gridblocks and their containing fracture cells, and this approximation has a higher accuracy than that in original 3D EDFM. Meanwhile, corresponding methods of fracture-shape characterization and calculating the multiple singular integrals on arbitrary polygonal fracture cells are introduced. Three examples are implemented to confirm the proposed 3D EDFM is valid and indeed accomplishes a more accurate modeling of transient effects compared with original 3D EDFM. Furthermore, two cases of natural depletion with a complex fracture network, water flooding with inclined elliptic fractures are implemented to demonstrate the performance and applicability of the proposed 3D EDFM to production simulation of multi-stage fractured horizontal well.