Hydrate decomposition inhibiting composition, coupling enhanced solid hydrate, and method for improving solid hydrate storage and transportation stability

A method for improving solid hydrate storage and transportation stability comprising a hydrate production process, a hydrate storage and transportation process and a gas release process, wherein:

• (1) the hydrate production process serves to prepare a solid state hydrate core by dispersing a hydrate forming agent in an aqueous phase to form an aqueous system, contacting a gas with the aqueous system in which the hydrate forming agent is dispersed under the hydrate formation conditions;
• then adding a dispersion liquid containing a starch-based surface active agent under the hydrate formation conditions to form an hydrate protective layer encapsulating the solid state hydrate core outside the solid state hydrate core to prepare a coupling enhanced solid hydrate;
• wherein the starch-based surfactant comprises a carboxymethyl starch salt and an alkyl glycoside surfactant;
• (2) the hydrate storage and transportation process serves to store and transport the coupling enhanced solid hydrate generated by the hydrate production process under the hydrate self-protection conditions;
• and
• (3) the gas release process serves to decompose the coupling enhanced solid hydrate after the hydrate storage and transportation process under the hydrate decomposition conditions, and release the gas therein.