Surfactants increase the rate of gas hydrate formation and the gas storage capacity in hydrates in a quiescent system. An anionic surfactant (sodium dodecyl sulfate) and a nonionic surfactant (dodecyl polysaccharide glycoside) were used in this work. The effect of a nonionic surfactant on hydrate formation is less pronounced, compared to that of an anionic surfactant. The presence of cyclopentane also improved the rate of hydrate formation; however, it could not improve the gas storage capacity in hydrates.