Gas hydrates have become an increasing problem to the oil and gas industry as the development entering deeper water encounters high-pressure and low-temperature regions. However, the mechanisms and applications of kinetic hydrate inhibitors are less well understood. This paper provides an overview of the performance of common hydrate inhibiting molecules that are currently available and discusses the mechanisms of hydrate inhibition and the synergy of different hydrate inhibiting molecules and therefore provides some guidance in future development on hydrate inhibiting molecules for different gases.

This paper investigates the application of kinetic hydrate inhibitors in three different gases and the synergy between different inhibiting molecules. Several commercially available kinetic hydrate inhibitors have been evaluated in the laboratory using a rocking cell apparatus. Three different gas compositions were used in the performance evaluation. The synergy of different inhibitor molecules has been studied through the evaluation of various mixtures. The field requirement for low viscosity and high cloud point for kinetic hydrate inhibitors have also been studied and discussed. The hydrate dissociation curves for three gases have been modelled and the subcooling potential for each of the products has been calculated.

Following the review and optimisation of the different hydrate inhibiting molecules available in the market, it was found that one of the optimised mixtures has outperformed all the individual hydrate inhibiting molecules and mixtures for all three gases. This suggests synergy between the different hydrate inhibiting molecules; the possible mechanisms are discussed in this paper.

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