对于具有强烈应力灵敏度的深层煤矿库的CO2 - ECBM的数值模拟
Shengli Gong1, Lu Zhang1, Tongyao Zhang1
1EnerTech-Drilling&Production Co., China National Offshore Oil Corporation, Tianjin, 300452, China.
Heliyon
|August 19, 2024
概括
将二氧化碳 (CO2) 注入深层煤层,通过提高储的透性和取代吸附的CH4.4来增强甲 (CH4) 的回收. 这种二氧化碳增强煤床甲 (CO2-ECBM) 方法显著提高了CH4的生产率和整体回收.
科学领域:
- 地质科学 地质科学
- 石油工程是石油工程中的一个.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 煤床甲 (CBM) 产量在深层层中迅速下降,留下大量的残留甲.
- 深层煤层的特点往往是高度的应力敏感性,影响储库特性.
- 增强的甲回收对于最大限度地利用枯竭水库的资源至关重要.
研究的目的:
- 开发和验证用于深度CBM开发的合吸附-水热机械 (AHTM) 模型.
- 调查二氧化碳注入对提高深层煤矿库中甲回收的有效性.
- 量化CO2-ECBM对水库透性,甲生产和回收效率的影响.
主要方法:
- 建立一个合的AHTM模型,包括非同热,非恒压竞争性吸附,多相流,扩散,传热和应力变化.
- 模型验证使用中国西北一个深层煤矿库的历史生产数据.
- 模拟二氧化碳注入场景,以评估增强的CBM (CO2-ECBM) 性能.
主要成果:
- 初级CBM回收导致水库透率的快速下降 (从7.89 × 10−16 m2降至<1.50 × 10−16 m2) 和甲生产率.
- 在700天的初级回收后,二氧化碳注入 (10MPa) 显著增加了水库的透性和甲生产率.
- 根据关闭的甲生产速度值,CO2-ECBM可以提高22.46%23.36%的甲回收.
结论:
- 该AHTM模型准确地模拟了深度CBM开发和二氧化碳注入的影响.
- 二氧化碳注入是一种有效的策略,用于增强深层,压力煤矿库中的甲回收.
- CO2-ECBM在甲生产率和整体资源回收方面提供了实质性的改进,对深度CBM开发具有重要意义.
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