Thermodynamic study of several hydrates in dispersed systems using Differential Scanning Calorimetry

Abstract : Differential Scanning Calorimetry (D.S.C.) was used to determine the temperature stability conditions at atmospheric pressure of trichlorofluoromethane hydrate in water-in-oil emulsions in which the water phase contained from 7 to 27 wt.% of calcium chloride, and the temperature stability conditions at pressures ranging from 5 to 12 MPa of hydrates of methane and natural gas, in solutions and water-in-oil emulsions in which the water phase contained either sodium chloride at a concentration of 17 wt.%., or calcium chloride at a concentration of 23 wt.%. The influence of repeated cycles of natural gas hydrate formation and dissociation on the stability of the emulsion was evidenced on a real oil-based drilling fluid. It was found that D.S.C. is a fast, easy to use and precise alternate method of determination of hydrates stability conditions. Comparing the results with literature data, when available, showed very good agreement. This technique can be applied to virtually any kind of mixture containing water, even very complex fluids containing several solid phases suspended in a multiphasic liquid, such as drilling fluids, for which the use of the PVT technique is particularly uneasy.
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Contributor : Didier Dalmazzone <>
Submitted on : Wednesday, October 14, 2015 - 4:59:55 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM

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  • HAL Id : hal-01215695, version 1

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Didier Dalmazzone, Mamdouh Kharrat, Danièle Clausse, Benoît Fouconnier. Thermodynamic study of several hydrates in dispersed systems using Differential Scanning Calorimetry. 4th International Conference on Gas Hydrates, May 2002, Yokohama, Japan. ⟨hal-01215695⟩

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