Experimental procedure and results to measure the composition of gas hydrate, during crystallization and at equilibrium, from N2-CO2-C2H6-C3H8-C4H10 gas mixtures
Résumé
Gas hydrates are of great interest in petroleum industry. They are especially a flow assurance issue in deep offshore oilfields. In this study, an experimental work concerning the equilibrium of gas hydrates of light hydrocarbon molecules is proposed. 12 experiments from N2-CO2-CH4-C2H6-C3H8-C4H10 gas mixtures in temperature range of [0.8-19°C] and pressure range of [1.4 - 66bars] have been carried out. 78 equilibrium points have been measured following two procedures. The first and main procedure (71 equilibrium data) corresponds to a procedure at high crystallization rate (high supersaturation, or high ΔP). The objective of this first procedure is to study the gas hydrates formation in usual dynamic conditions (start-up or reboot of an exploitation). The second procedure corresponds to a procedure at very low crystallization rate (7 data). The objective of this second procedure is to anticipate a further study about the thermodynamic or kinetic involvement in hydrate formation. It might also be closer to the conditions along a pipe-line at steady state. In this article, for all the points and procedures, the PT data are given. Also, the hydrate phase molar compositions are given for most of the measured equilibria.
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