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| 引入颗粒运移的能源砂土THMC多场双向耦合计算方法 |
| A THMC multi-physics two-way coupling method for methane hydrate bearing sand accounting for particle migration |
| 投稿时间：2025-09-08 修订日期：2025-11-12 |
| DOI： |
| 中文关键词: 颗粒运移 甲烷水合物开采 流固耦合 数值方法 |
| 英文关键词:Particle migration Methane hydrate extraction Fluid-solid coupling Numerical method |
| 基金项目:国家自然科学(52531010,52331010)；国家重点研发计划(2022YFC3003403) |
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| 中文摘要: |
| 天然气水合物是一种新型清洁能源，在其开采过程中常伴有含天然气水合物土（称能源土）内的颗粒运移，易引发开采井出砂，威胁开采效率和工程安全。现有数值仿真方法难以对水合物相变、能源土力学响应及颗粒运移过程实现同步且准确的模拟。为此，本研究基于团队研发的适用于水合物开采的能源砂土温度-渗流-土体应变-水合物相变（THMC）多场耦合计算方法，通过引入颗粒-流体相互作用模型并对相应耦合程序进行适应性改进，在现有可考虑水合物开采、土体力学特性演变的THMC多场耦合框架基础上，实现对颗粒运移过程的双向耦合计算和仿真分析。经一维固结、一维热传导、单颗粒静水沉降理论解及渗流算例验证，改进程序在保留原有功能的同时，可准确模拟颗粒运移过程，适用于水合物安全高效开采的多因素、全过程数值仿真研究。 |
| 英文摘要: |
| Methane hydrate (MH) is a type of clean energy. The particles in the MH-bearing sand (MHBS) are prone to migration during exploitation process, which may lead to sand production in wells, impacting extraction efficiency and engineering safety. However, existing numerical methods are difficult to simulate the hydrate phase transition, mechanical response of MHBS, and particle migration processes simultaneously and accurately. Therefore, this study improved the existing thermo-hydro-mechanical-chemical (THMC) multi-physics coupling method for the MH extraction simulation by incorporating particle-fluid interaction models and modifying the corresponding coupling program. The improved program is able to conducting THMC multi-physics two-way coupling calculation, and simulate particle migration alongside the mechanical behavior of MHBS during MH extraction. The improved program was verified/validated through three theoretical solutions (i.e. one-dimensional consolidation, one-dimensional heat conduction and single particle settling) and a numerical simulation of seepage in granules. The results demonstrate that the improved program can accurately simulate the particle migration process while retaining the original capabilities, which shows that the program is suitable for the multi-factor and full-process numerical simulation of the research for safe and efficient MH extraction. |
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