Breakage mechanism analysis of bedded sandstone impacted by abrasive water jet using an integrated SPH-DEM-FEM and cohesive element method

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2024-10-07 DOI:10.1016/j.geothermics.2024.103177

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引用次数: 0

Abstract

Abrasive water jet (AWJ) is an emerging technique for improving the drilling efficiency for geothermal energy development. Rock bedding significantly influences the effectiveness of rock breaking during drilling. In this study, to investigate the damage modes and the mechanism of the bedded sandstone under abrasive water jet erosion, smooth particle hydrodynamics (SPH) and discrete element method (DEM) are used to establish the jet, and cohesive elements are inserted into finite elements to model the bedded sandstone, simulating the process of water and abrasive into the nozzle to form an abrasive water jet impacting bedded sandstone. The numerical results showed that the depth and diameter of fractures in bedded sandstone decrease and then stabilize as the bedding angle increases under AWJ, and the error in the ratio of erosion hole diameter and depth between the simulated and experimental results was <10.8 %. In addition, two damage modes of the bedded sandstone were determined, which include Case I damage mode: the sandstone is well consolidated, and the damage is in the form of erosion holes (0°≤α≤60°), dominated by the tensile damage, and Case II damage mode: the rock is fractured along the bedding and splits into two halves (60°<α≤90°), and the process can be divided into two stages during this mode. The first stage is the impact kinetic energy carried by the jet to form a crater, and the second stage is the water wedge effect to fracture the rock. The results of this study complement the damage mechanism of fractured bedded rocks by AWJ, which provides a theoretical reference for the application of AWJ to break bedded rocks in subsurface energy extraction.

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利用综合 SPH-DEM-FEM 和内聚元素法分析受到磨料水射流冲击的层状砂岩的破碎机理

加砂水射流（AWJ）是一种提高地热能源开发钻探效率的新兴技术。岩石垫层对钻探过程中的破岩效果有很大影响。本研究采用光滑粒子流体力学（SPH）和离散元法（DEM）建立射流，并在有限元中插入内聚元，模拟水和磨料进入喷嘴形成磨料水射流冲击层状砂岩的过程，研究磨料水射流侵蚀下层状砂岩的破坏模式和机理。数值结果表明，在 AWJ 作用下，层状砂岩的裂缝深度和直径随着层理角的增大而减小，然后趋于稳定，模拟结果与实验结果之间侵蚀孔直径与深度之比误差为 10.8%。此外，还确定了床层砂岩的两种破坏模式，包括情况 I 破坏模式：砂岩固结良好，破坏形式为侵蚀孔（0°≤α≤60°），以拉伸破坏为主；情况 II 破坏模式：岩石沿床层断裂并分裂为两半（60°<α≤90°），该模式下的破坏过程可分为两个阶段。第一阶段是射流携带的冲击动能形成陨石坑，第二阶段是水楔效应使岩石断裂。该研究结果补充了 AWJ 对破裂基岩的破坏机理，为在地下能源开采中应用 AWJ 破坏基岩提供了理论参考。

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

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.