학술논문

Dynamic connectivity analysis of fracture-vuggy reservoir based on meshless method
Document Type
Article
Source
In Geoenergy Science and Engineering March 2025 246
Subject
Language
ISSN
2949-8910
Abstract
This paper proposes a novel numerical method with meshless characteristics to analyze the inter-well connectivity in fractured-vuggy reservoirs. First, a three-dimensional point cloud technology is employed to adaptively discretize and represent the fractured-vuggy reservoir. A system of connection elements is constructed by selecting an appropriate radius of influence and limiting angle between nodes. Each connection element is characterized by two factors: connection transmissibility and connection volume. The discrete form of the three-dimensional seepage control equation is derived by the connection element method. Subsequently, a sequential solution scheme is employed for numerical simulation calculations. On this basis, the paper introduces historical fitting methods and path tracing algorithms, creating two types of connectivity evaluation indicators. These are employed to conduct a connectivity analysis of the dynamic simulation method for fractured-vuggy reservoirs. Example validations demonstrate that the meshless discrete method has a significant advantage in depicting the geometric characteristics of reservoirs. It exhibits greater flexibility and freedom, particularly when dealing with the complex distribution of fractures and vugs and the irregular boundaries of reservoirs, compared to traditional grid-based methods. This method not only preserves the complexity of the flow structure but also maintains the integrity of the flow paths. Moreover, the analysis of connection transmissibility and connection volume effectively reflects the interactions and connectivity between wells, accurately characterizing the inter-well formation parameters of the reservoir. The high degree of agreement between the computational trends and the reference solution throughout the reservoir production cycle confirms the accuracy of the method. The proposed method is applicable to actual oil fields and can accurately identify the dominant connectivity paths and connectivity patterns between reservoir wells.