注CO_2置换煤层CH_4试验研究  

Experimental study on coal-bed methane displacement by carbon dioxide injection

作　　者：王晋[1] 王延斌[1] 范晶晶[1] 刘成龙[1] 薛培[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《科技导报》2015年第17期84-89,共6页Science & Technology Review

基　　金：国家科技重大专项(2011ZX05042-003-001;2011ZX05034-005)

摘　　要：利用屯留矿和寺河矿圆柱体原煤试样,进行不同注入压力条件下注CO2置换CH4试验,研究分析了置换过程中气体的吸附特性及注入压力对CO2置换效果的影响,提出了低孔隙压力条件时具有更好的置换效果。研究结果表明,同等条件下,置换平衡后煤体吸附CO2气体能力远强于CH4;煤体中CH4体积比随注入压力的降低而减小,而CO2体积比则呈现相反趋势;在8MPa围压条件下,随着注入压力的升高,CH4产出率呈线性关系降低,CO2置换比呈指数关系减小,显示出在试验压力范围内,低压条件下的CO2置换效果更佳;同等条件时,相对于试验中的无烟煤,贫瘦煤置换效果更好。This study used the cylinder raw coal samples from Tunliu coal mine and Sihe coal mine to carry out the displacement of CH4 with CO2 experiment under the different injection pressures. Analyzed the gas adsorption characteristics in the experiment and the influence of injection pressures on the replacement of with CO2, and proposed that replacement effect was better at low pore pressure. The results are as follows. Adsorption capacity of CO2 is stronger than that of CH, under the same condition in the process of displacement; CH4 volume ratio decreases with injection pressure decreasing, while CO2 volume ratio shows the opposite trend; When the confining pressure is 8 MPa, the CH4 output ratio reduces with linear relation and the replacement ratio of CO2 reduces with exponential relation as injection pressure increases, and indicating that the replacement is better at low injection pressure in this displacement experimental; The replacement effect of meager lean coal sample is better than anthracite under the same conditions in this experimental.

关 键 词：CO2 CH4 置换试验 产出率 置换比 

分 类 号：TE377[石油与天然气工程—油气田开发工程]