Numerical investigation of the effect of fractures on acid dissolution patterns in naturally fractured carbonate reservoirs

作者：Ali Mahdizadeh Asl, Alireza Ebrahimi Kandowjani, Behnam Sedaee · 发表于：Petroleum Geoscience · 年份：2025 · DOI：10.1144/petgeo2024-007 · 被引用次数：1 · 研究领域：Hydraulic Fracturing and Reservoir Analysis、Drilling and Well Engineering、Hydrocarbon exploration and reservoir analysis

Formation damage poses significant challenges in numerous carbonate oil and gas fields, often impeding hydrocarbon recovery. A widely adopted solution to mitigate these issues is the application of acid treatment, specifically matrix acidizing, which enhances permeability and repairs formation damage in carbonate reservoirs. Understanding the influence of fractures on fluid flow behaviour in naturally fractured carbonate reservoirs is both a critical and complex endeavour. Previous studies have inadequately characterized the mechanisms and effects of fractures on acidizing processes. This study introduces a novel model to quantitatively and qualitatively assess the impact of individual fractures under varying injection rates, as well as the influence of key fracture parameters on acidizing efficiency. The proposed model integrates a two-scale approach with a pseudo-fracture methodology to simulate acidizing in fractured carbonate media. Fluid transport equations were resolved at the Darcy scale and coupled with structural relationships at the pore scale. The findings demonstrate the distinct effects of horizontal and vertical fractures on dissolution patterns compared to fracture-free media. Specifically, the presence of a horizontal fracture reduces the pore volume to breakthrough (PV bt ) by 35% relative to homogeneous conditions, and also promotes the range of optimal injection rates rather than pinpointing a single rate. Conversely, a vertical fracture increases the PV bt...