Abstract: A hydrate decomposition inhibiting composition, a coupling enhanced solid hydrate, and a method for improving the solid hydrate storage and transportation stability relating to the technical field of natural gas safety storage and transportation are provided. The hydrate decomposition inhibiting composition contains a carboxymethyl starch salt and an alkyl glycoside surfactant. The composition improves the interface stability of the hydrate phase boundary and the mechanical stability of the hydrate and enhance the strength of the hydrate crystal interface since the colloidal solution formed by dispersing the sodium carboxymethyl starch and the alkyl glycoside surfactant in water can coat the surface of the hydrate to form a protective layer, thereby improving the structural stability of the hydrate. Therefore, the composition inhibits the decomposition of the hydrate, reduces the decomposition rate of the hydrate, and can further reduce the decomposition amount of the hydrate.

Abstract: A hydrate promoter contains a component A which is a substance having a group represented by the Formula I below and a surfactant. A molar ratio of the component A to the surfactant is 1:(0.03-30). The hydrate overcomes the disadvantages of the conventional hydrate promoter, such as small gas storage capacity and low generation rate, the present disclosure is further capable of suppressing generation of air bubbles and improving the gas recovery rate of hydrate during decomposition process of the hydrate, as compared to the conventional hydrate promoter, thus has a favorable application prospect for natural gas storage and transportation with the hydrate.