Mechanisms of non-uniform propagation of hydraulic fractures: A comprehensive numerical investigation

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Analysis with Boundary Elements Pub Date : 2025-05-26 DOI:10.1016/j.enganabound.2025.106307

Changxin Yang , Zhaozhong Yang , Hehua Wang , Liping Jiang , Liangping Yi , Yi Cheng , Duo Yi

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引用次数: 0

Abstract

Based on the displacement discontinuity method (DDM) and the finite volume method (FVM), a non-planar three-dimensional integrated simulator for simulating hydraulic fracture (HF) propagation is proposed to study the competitive propagation mechanisms of HF in the presence of stress interference and natural fractures (NFs). The embedded discrete fracture model (EDFM) is introduced to describe the fluid flow between fracture and matrix, and the fully coupled equations for fracture propagation and fluid flow are derived. An optimized methodology for calculating and assembling of the influence coefficient matrix is introduced. Based on the established numerical model, the discrepancies in fracture geometries and fluid pressure during multi-cluster fracturing in the horizontal well are systematically analyzed, both with and without considering the impact of fracture deflection. The basis for selecting planar versus non-planar three-dimensional models to simulate the competitive propagation of multiple fractures is presented. Moreover, the asymmetrical distribution of NFs leads to non-uniform propagation of the wings of HF. The degree of non-uniformity in HF propagation is proportional to the differences between NFs. A reduction in the length and approach angle of NFs results in a greater propagation distance for HF.

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水力裂缝非均匀扩展机制：综合数值研究

基于位移不连续法（DDM）和有限体积法（FVM），建立了水力裂缝扩展的非平面三维综合仿真器，研究了应力干扰和天然裂缝（NFs）存在时水力裂缝的竞争扩展机制。引入嵌入离散裂缝模型（EDFM）来描述裂缝与基质之间的流体流动，推导出裂缝扩展与流体流动的完全耦合方程。介绍了一种影响系数矩阵计算和组合的优化方法。在建立数值模型的基础上，系统分析了考虑和不考虑裂缝挠度影响的水平井多簇压裂过程中裂缝几何形状和流体压力的差异。提出了选择平面和非平面三维模型来模拟多裂缝竞争扩展的依据。此外，NFs的不对称分布导致HF翼的传播不均匀。高频传播中的不均匀度与NFs之间的差异成正比。NFs的长度和进近角的减小导致HF的传播距离增大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.