The three-phase, hydrate-water-rich liquid-vapor (HLV), equilibria of the binary guest mixtures containing CO2 and N-2 were determined at the temperature range of 272-275 K and different compositions of vapor phase. In addition, two phase equilibria of hydrate and vapor were also measured at three isothermal conditions of 274, 277 and 278 K. The resulting P-x diagram indicates that CO2 can be more contained than N-2 in the hydrate phase. More than 96 mol% CO2 in the mixed hydrate phase was obtained from a gas mixture of 17 mol% CO2 and 83 mol% of N-2 at 274 K. The addition of tetrahydrofuran (THF) as a hydrate promoter extended hydrate stability region by elevating equilibrium dissociation temperature and lowering pressure. The overall hydrate equilibrium results were found to agree well with the calculated ones.