A coupled hydro-mechanical field-enriched finite element method for simulating the hydraulic fracture process of rocks subjected to in situ stresses

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2025-01-22 DOI:10.1007/s11440-024-02518-2

Linyuan Han, Xiaoping Zhou

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引用次数: 0

Abstract

A coupled hydro-mechanical field-enriched finite element method (HM-FE-FEM) is developed for simulating the hydraulic fracture process of rocks subjected to in situ stresses. The staggered iterative scheme based on the Newton–Raphson iterative algorithm is utilized to address the coupled hydro-mechanical problems. The opening process of the hydraulic fracture and natural fracture subjected to in situ stresses can be reproduced by the proposed method. The accuracy of the proposed method is verified through stress intensity factor, fracture opening and experiment results. For coalescence patterns between hydraulic and natural fractures, the influences of horizontal stress difference and intersection angle are analyzed and discussed. Additionally, for coalescence patterns between hydraulic fracture and natural karst caves, the influences of cave location, cave radius and horizontal stress difference are investigated and discussed. The numerical results illustrate the effectiveness of HM-FE-FEM in handling the complex coalescence behaviors in the hydraulic fracture process of underground rock reservoirs with different defects. This study has a certain guiding significance for optimizing the fracturing operation parameters.

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一种模拟岩石在原位应力作用下水力破裂过程的富水-力耦合有限元方法

提出了一种模拟岩石在原位应力作用下水力破裂过程的水-力-场耦合有限元方法。采用基于Newton-Raphson迭代算法的交错迭代方案来解决水-力耦合问题。该方法可模拟水力裂缝和天然裂缝在原位应力作用下的开启过程。通过应力强度因子、裂缝开度和试验结果验证了该方法的准确性。对于水力裂缝与天然裂缝的贯通模式，分析讨论了水平应力差和相交角对裂缝贯通模式的影响。此外，还研究了溶洞位置、溶洞半径和水平应力差对水力裂缝与天然溶洞汇合模式的影响。数值结果说明了HM-FE-FEM在处理含不同缺陷地下储层水力破裂过程中复杂聚结行为的有效性。该研究对优化压裂作业参数具有一定的指导意义。

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来源期刊

Acta Geotechnica ENGINEERING, GEOLOGICAL-

CiteScore

9.90

自引率

17.50%

发文量

297

审稿时长

4 months

期刊介绍： Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.