Calorimetric Studies of Formation/Decomposition Processes of Natural Gas Hydrates in Paraffin Oil/Water Emulsions

Abstract The paper considers the research results of natural gas (NG) hydrate formation process in systems consisting of paraffin oil and distilled water at various ratios. Thermobaric conditions of hydrates phase transitions in water-oil emulsions were determined by the method of high-pressure differential scanning calorimetry (DSC). It was ascertained that the equilibrium curve in systems under study, compared to the process of hydrate formation of this gas in distilled water, is shifted in the area of low pressures and high temperatures. According to DSC analysis results and volume analysis, it was determined that with increase of the water content in emulsions by more than 40 % of mass, the degree of water conversion into hydrate in emulsions decreases. It was concluded that the degree of water conversion into hydrate in emulsions can be used as an index of its stability.

[1]  Michael L. Johns,et al.  Gas hydrate plug formation in partially-dispersed water–oil systems , 2016 .

[2]  M. E. Semenov,et al.  Synthesis and phase transformations of natural gas hydrates of Srednevilyuiskoe field , 2014, Russian Journal of Applied Chemistry.

[3]  L. Altunina,et al.  Dependence of the rate of formation and the P-T stability field of methane hydrate suspensions in crude oils upon oil composition , 2014, Petroleum Chemistry.

[4]  M. E. Semenov,et al.  DSC and thermal imaging studies of methane hydrate formation and dissociation in water emulsions in crude oils , 2014, Journal of Thermal Analysis and Calorimetry.

[5]  E. D. Sloan,et al.  Model Water-in-Oil Emulsions for Gas Hydrate Studies in Oil Continuous Systems , 2013 .

[6]  Carolyn A. Koh,et al.  Predicting Hydrate-Plug Formation in a Subsea Tieback , 2009 .

[7]  E. Dendy Sloan,et al.  Methane hydrate formation and an inward growing shell model in water-in-oil dispersions , 2009 .

[8]  C. Noik,et al.  Application of DSC for Emulsified System Characterization , 2009 .

[9]  L. Barré,et al.  Discussion of Agglomeration Mechanisms between Hydrate Particles in Water in Oil Emulsions , 2009 .

[10]  C. Dalmazzone,et al.  DSC measurements and modelling of the kinetics of methane hydrate formation in water-in-oil emulsion , 2009 .

[11]  E. D. Sloan,et al.  Measurements of methane hydrate heat of dissociation using high pressure differential scanning calorimetry , 2008 .

[12]  Carolyn A. Koh,et al.  Hydrate formation from high water content-crude oil emulsions , 2008 .

[13]  Carolyn A. Koh,et al.  GAS HYDRATE FORMATION AND DISSOCIATION FROM WATER-IN-OIL EMULSIONS STUDIED USING PVM AND FBRM PARTICLE SIZE ANALYSIS , 2008 .

[14]  L. Rousseau,et al.  Application of high pressure DSC to the kinetics of formation of methane hydrate inwater-in-oil emulsion , 2006 .

[15]  C. Noik,et al.  A method for the characterization of emulsions, thermogranulometry: application to water-in-crude oil emulsion. , 2005, Journal of colloid and interface science.

[16]  I. N. Evdokimov,et al.  Excess density in oilfield water-crude oil dispersions. , 2005, Journal of colloid and interface science.

[17]  E. D. Sloan.  Hydrate Engineering , 2000 .

[18]  Carolyn A. Koh,et al.  Clathrate hydrates of natural gases , 1990 .