Hydrate formation conditions of four natural gases in pure water were measured in a sapphire cell using the “pressure search”method. The experiment temperature range was 274.15 K—284.15 K

and the pressure was 1.04—7.05 MPa.The Chen-Guo hydrate model was used to calculate the hydrate formation conditions of these four natural gases.The average deviation of calculated values to experimental ones was only 0.75%.Good agreement between experimental data and calculated values was achieved.The obtained experimental data are valuable for designing an industrial process to transporting natural gases.