摘要
通过对不同变质程度的煤进行不同温度点的等温和吸附/解吸的实验,综合分析认为,煤层气在降压解吸过程中,随着压力的降低和煤阶提高,解吸滞后特征显著,温度增大解吸滞后现象不显著。不同变质程度煤的分子构成和孔隙结构导致了煤的物性差异,这是煤层气降压解吸滞后与升温解吸滞后差异的主要原因。实践中,在煤层气井排采后期,用升温解吸技术促进残余气解吸是提高煤层气采出率的重要途径。
The CBM desorption hysteresis characteristics were analyzed based on adsorption-desorption experiments of different metamorphic sequence coal under variable-temperature and isothermal condition. Comprehensive analysis shows that the desorption hysteresis characteristics are notable for improving coal ranks and reducing pressure, desorp- tion hysteresis characteristics are not significant under increasing temperature. Differences of molecules and pore struc- ture between high and low-rank coals lead to the difference of their properties which is the primary cause of desorption hysteresis difference. In practice, promoting desorption of residual coal-bed methane under deficient pressure is a re- search direction to improve CBM recovery.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第11期1885-1889,共5页
Journal of China Coal Society
基金
国家科技重大专项"煤层气田产气能力影响因素分析"资助项目(2008ZX05034-003)
陕西省教育厅科学研究计划自然科学专项资助项目(2010JK684)
关键词
煤层气
解吸滞后
降压解吸
升温解吸
CBM （ coalbed methane）
desorption hysteresis
depressurization desorption
warming-up desorption
