基于热-水-力耦合模型的CO2注入时间对煤层气提高采收率的影响

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-06-14 DOI:10.1016/j.csite.2025.106510

Hexiang Xu , Cheng Zhai , Jizhao Xu , Yong Sun , Ting Liu , Yangfeng Zheng , Hongyang Xu , Ting Huang

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引用次数: 0

摘要

在CO2强化煤层气（CO2- ecbm）开采过程中，延迟CO2注入可以防止CO2过早突破生产井。目前，CO2注入时间对CO2- ecbm采收率的影响尚不清楚。建立热-水-机械（THM）耦合模型，研究不同注入时间下CO2-ECBM采收率。确定了孔隙度演化特征和最佳注入时机。结果表明，高压CO2注入提高了储层压力，提高了CH4产量。随着注入时间的增加，储层温度升高，渗透率下降。延迟注入CO2可以避免低效注入阶段，保持较高的注入速度。注入时间与CH4产量、CO2储存量、突破时间呈线性相关，与最终CH4浓度呈s型趋势。CO2注入缩短了孔隙压力主导的孔隙度控制阶段，放大了气体/解吸诱发应变的影响。温度变化对孔隙度影响较小，但较高的初始温度会降低气体吸附，显著影响孔隙度。最终确定最佳注入时间为1000 d，有利于提高CH4的回收率，实现CO2的高效封存。

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Influence of CO2 injection timing on enhanced coalbed methane recovery using thermo-hydro-mechanical coupled model

Delayed CO₂ injection can prevent premature CO₂ breakthrough to production wells during CO₂ enhanced coalbed methane (CO₂-ECBM) recovery. Currently, the influence of CO₂ injection timing on CO₂-ECBM recovery is unclear. In this paper, the thermo-hydro-mechanical (THM) coupled model was established to investigate the CO₂-ECBM recovery with different injection timings. The porosity evolution characteristics and the optimal injection timing were determined. The results show that high-pressure CO₂ injection elevates reservoir pressure and enhances CH₄ production. As injection time increases, reservoir temperature rises, and permeability declines. Delayed CO₂ injection can avoid inefficient injection stage and maintain a higher injection rate. Injection timing showed linear correlations with CH₄ production, CO₂ storage volume, and breakthrough time, and an S-shaped trend with final CH₄ concentration. CO₂ injection shortens the pore pressure-dominated control stage of porosity and amplifies the influence of gas ad/desorption-induced strain. Temperature changes have a minor effect on porosity, but high initial temperature can reduce gas adsorption, significantly affecting porosity. Finally, the optimal injection time was determined as 1000 d. The results are beneficial for improving the CH₄ recovery and realizing the efficient CO₂ storage.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.