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通过N₂注入在热水力机械相互作用下增强煤层气提取的建模研究

Weiqin Zuo^1,2, Liwen Li¹, Yanwei Liu¹

¹School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.

|September 23, 2024

概括

(N2) 注射通过改善气体流量和取代甲来增强煤床甲 (CBM) 恢复. 更高的注射压力比温度更有效地增加CBM提取.

科学领域:

石油工程是石油工程中的一个.
地质科学是地球科学.
化学工程是化学工程的重要组成部分.

背景情况:

煤床甲 (CBM) 的低回收率需要先进的提取技术.
(N2) 注射是提高CBM生产后期阶段的气体流量容量的有希望的方法.
了解热N2注入的热力学和流量合机制对于优化CBM提取至关重要.

研究的目的:

建立一个N2注入的数学模型,考虑煤层变形,流体运输和温度变化.
为了研究热力学流量合关系和热N2注入期间的传输机制.
分析N2注射的漏热传递效应对甲 (CH4) 提取速率的影响.

主要方法:

开发一个合数学模型,模拟N2注入,煤层变形,流体运输和温度变化.
利用该模型分析漏热传递对CH4提取效率的影响.
研究初始煤层温度,初始透性,注入压力和注入温度对N2扩散和CH4回收的影响.

主要成果:

2注入机制包括增加漏,促进流动,并取代气体.
较高的初始煤层温度减少了煤骨架变形,并在N2注入过程中增加了透性.
较高的初始煤层透性提高了N2扩散和CH4流动的促进.
注射压力对CH4回收的影响比注射温度更大.
高注入压力促进N2透和CH4扩散;高温增强了气体吸附.

结论:

2注射通过改善气体流量和位移,有效地增强CBM提取.
煤层特性 (温度,透性) 和注入参数 (压力,温度) 显著影响N2的有效性.
优化注射压力是最大限度地回收CH4的关键,而温度主要影响气体脱吸.

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