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论文类型：期刊论文

发表时间：2018-02-01

发表刊物：JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING

收录刊物：SCIE、EI

卷号：50

页面范围：293-300

ISSN号：1875-5100

关键字：Horizontal dispersion coefficient; Enhanced gas recovery; Gravity effect; Carbon dioxide; CCUS

摘要：CO2 sequestration with enhanced gas recovery (CO2-EGR) is a promising technology, especially in the case of re-injecting the separated CO2 from natural gas into the same gas reservoir. The description of dispersion between these two gases benefits for understanding of this miscible displacement and the related reservoir simulation. Here the dispersion properties of CO2-CH4 were studied in short and long sand packs through CO2 horizontally displacing natural gas, both CH4 and one kind of simulated natural gas -SNG (composed of 0.90 CH4 + 0.10 CO2 in mole fraction). We evaluated the effect of gravity and CO2 impurity in SNG on the horizontal dispersion. The gravity effect affected the entry/exit effect and jointly caused the considerably larger dispersion coefficients in the long core than that in the short core. Due to the existence of CO2 impurity, SNG makes itself diffuse into CO2 more easily. Effectively it results in the larger dispersion coefficients. Simultaneously, the horizontal dispersivity of the sand pack calculated as about 0.0161m in this work, was comparatively larger than the vertical one, resulted from the gravity effect.