Experimental verification of CH4-CO2 swap in methane-propane-carbon dioxide mixture hydrates

Abbasov, Abbas
Significant interest has been given to unconventional hydrocarbon resources in recent years. Natural gas hydrates are one of the key components of unconventional hydrocarbon resources to be addressed. However, energy utilization from hydrate reservoirs is challenging and related researches are still being carried out. Recently, a method in which methane gas (CH4) is recovered from natural gas hydrate formations by injection of carbon dioxide (CO2) has been proposed. This method is considered to be a promising solution to simultaneously access an unconventional fossil fuel reserve and reduce atmospheric CO2 increase. In this study, formation of natural gas hydrate in porous media at laboratory conditions was carried out by using a mixture of gases: methane (CH4), propane (C3H8) and carbon dioxide (CO2). Composition of the gas mixture was obtained from the results of the investigations of the Black Sea hydrate depositions, carried out by “The Institute of Marine Sciences and Technology” of Dokuz Eylul University in Izmir, Turkey. The following mole percent of the gases was used throughout experiments in order to simulate hydrate reservoir conditions of the Black Sea: CH4 (95%), C3H8 (3%) and CO2 (2%). It was shown that CH4-CO2 swap process takes place in CH4-C3H8-CO2 mixture hydrates as in the case of pure methane hydrates. Based on the results of this study, it was also observed that injection of CO2 into hydrate media caused release of propane which exhibits sII type hydrate structure.
Citation Formats
A. Abbasov, “Experimental verification of CH4-CO2 swap in methane-propane-carbon dioxide mixture hydrates,” M.S. - Master of Science, Middle East Technical University, 2014.