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非均质性和多种流型交叉的复杂性使裂缝储层中流体流动特性的确定变得非常困难。对于地下裂缝有限的了解以及不确定性通常使井间连通性和示踪剂轨迹的结果也不可靠。以前的研究不能分析3D离散裂缝网络中的井间传输,因为没有一种方法对同一裂缝中的平板流动和窜槽进行考虑。同时,由于网格划分问题,所以作为溶质传输工具的常规流线模拟,不能拓展到3D离散模拟。为确定随机离散裂缝储层的井间连通性和主流动路径,开发了一种新的带有正四边形网格发生器的流线模拟器。通过自动建立边界环路,在多边形裂缝中生成四边形网格。在非结构网格上用流线方法传递质量。突破曲线具有正偏特性,表明溶质传榆不但受地质非均质性的影响,而且受压力分布和可变孔径的影响。流线轨迹和停留时间分布证明示踪剂在递减压力梯度方向选择性地沿交线或裂缝面移动。这种应用了流线方法和自动四边形网格划分算法的新数值方法以相对理想的方式对井间连通性进行了快速分析。
The heterogeneity and complexity of multiple flow patterns make it very difficult to determine the fluid flow characteristics in fractured reservoirs. Limited knowledge and uncertainty about subsurface fractures often render the results of cross-well connectivity and tracer trajectories unreliable. Previous studies failed to analyze cross-well transmission in 3D discrete fracture networks because there is no single method to account for plate flow and channeling in the same fracture. At the same time, due to the meshing problem, conventional streamline simulations as solute transport tools can not be extended to 3D discrete simulations. In order to determine the interwell connectivity and the main flow path of stochastic discrete fractured reservoirs, a new flow simulator with quadrilateral grid generator was developed. A quadrilateral mesh is generated in the polygons by automatically creating a boundary loop. Streamline quality on unstructured grids. The breakthrough curve has a positive bias characteristic, indicating that solute is not only affected by geological heterogeneity but also influenced by pressure distribution and variable aperture. The streamline and residence time distributions demonstrate that the tracer selectively moves along the line of intersection or fracture surface in the direction of decreasing pressure gradient. This new numerical method using the streamline method and the automatic quadrilateral meshing algorithm provides a quick analysis of the crosswell connectivity in a relatively ideal way.