Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

Xiang, Changsheng; Peng, Bao-Zi; Liu, Huang; Sun, Chang‐Yu; Chen, Guangjin; Sun, Baojiang

doi:10.3390/en6021009

Cited by 32 publications

(19 citation statements)

References 28 publications

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“…Finding technological and technical solutions aimed to tackle with complex obstructions requires fundamental studies in the fi eld of phase transitions and hydrate growth kinetics in systems constituted by paraffi n deposits and water. However, an analysis of modern literature concerned with this problem demonstrated that studies of gas hydrates are concentrated on theoretical and experimental analyses of the thermodynamics and growth/dissociation kinetics of methane hydrates in water-oil emulsions of various compositions [3][4][5][6][7][8][9][10][11][12][13][14], with the processes of hydrate formation in natural gas mixtures in paraffi n and water deposits still remaining unstudied. Our communication presents data on the thermobaric conditions and kinetic of natural gas hydrate formation in systems composed in various proportions from commercial Asphaltene-Resin-Paraffin Deposits (ARPDs) of the paraffi nic type and water.…”

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confidence: 99%

Investigation of natural gas hydrates formation/decomposition processes in systems consisting of “commercial asphaltene–resin–paraffin deposits and water”

et al. 2015

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Results obtained in a study of the natural gas hydrate formation in model systems consisting of various proportions from commercial paraffinic type Asphaltene-Resin-Paraffin Deposits (ARPDs) and distilled water were considered. The synthesis and decomposition of hydrates in the systems under study were performed in a DSC calorimetric cell and in high-pressure chambers-reactors. The thermobaric conditions of phase transitions and the kinetics of formation and decomposition of natural gas hydrates in paraffin deposits and water were determined. It was found that specific features of the hydrate formation process in the systems under study reflect upon the shapes of crystallization isotherm signals. The hydrate formation process favors coalescence of dispersed water drops in the samples under study and leads to formation of coarse water fragments. In the presence of the ARPD, the curve of equilibrium hydrate formation conditions shifts to high pressures.

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confidence: 99%

Investigation of natural gas hydrates formation/decomposition processes in systems consisting of “commercial asphaltene–resin–paraffin deposits and water”

et al. 2015

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“…Ruffine et al [16][17][18][19][20] focused on hydrate reservoir exploration and field production tests using different porous media or sediment systems. Boxall et al [21][22][23] reported on the mechanism of hydrate dissociation in stirring reactors. The hydrate dissociation rate can be enhanced by increasing the experimental temperature or decreasing the experimental pressure.…”

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confidence: 99%

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Liu

Wu³

2019

Geofluids

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Dynamic characteristics of offshore natural gas hydrate (NGH) dissociation will provide the theoretical basis to analyze technical issues of oceanic hydrate exploitation. A mathematical model is developed to simulate offshore NGH dissociation by depressurization in marine sediments. Different phase combination statuses are involved in the process of NGH dissociation by taking ice melting and water freezing into account. The proposed methodology can analyze the processes of hydrate and water phase transitions, decomposition kinetics and thermodynamics, viscosity and permeability, ice-water phase equilibrium, and natural gas and water production. A set of an experimental system is built and consists of one 3-D visual reactor vessel, one isothermal seawater vessel, one natural gas and water separator, and one data acquisition unit. The experiments on offshore NGH dissociation by depressurization in 3-D marine sediments are carried out, and this methodology is validated against the full-scale experimental data measured. The results show that during the prophase, natural gas flow is preceded by water flow into the production wellbore and natural gas occupies more continuous flow channels than water under a large pressure gradient. Then, the natural gas flow rate begins to decline accompanied by an increase of water production. During the second phase, natural gas flow rate decreases slowly because of the decreased temperature of hydrate-bearing formation and low pressure gradient. The lower the intrinsic permeability in marine sediments, the later the water flow rate reaches the peak production. And the space interval of the production wellbore should be enlarged by an increase of the intrinsic permeability. The stable period of natural gas production enhances, and the water flow rate reduces with the increase of bottom-hole pressure in production wellbores. The main reason is the slow offshore NGH dissociation under the low producing pressure and the restriction of heat conductivity under the low temperature.

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“…Both properties can be determined accurately by calorimetry (Deschamps and Dalmazzone, 2009;Gupta etal., 2008). The results, found in the literature for gas hydrates at high pressures are, however, generally scarce and obtained by extrapolation or less accurate and more laborious techniques such as visual observation in PVT cells (Setzmann and Wagner, 1991;Ruffine et al, 2010;Xiang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study of Methane-Propane Hydrate Dissociation by High Pressure Differential Scanning Calorimetry

Menezes

Ralha

Franco

et al. 2018

Braz. J. Chem. Eng.

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Binary and ternary systems composed of methane-water and methane-propane-water, respectively, were studied using high pressure differential scanning calorimetry. The methodology was validated by comparing results for the binary system to experimental data obtained in the literature. The hydrate dissociation temperatures for the ternary system (methane-propane-water) at 21 MPa were experimentally determined for different compositions of the gas mixture and mole fractions of propane higher than 0.1 in the ternary system. Our results are in good agreement with the values predicted by applying the Cubic Plus Association (CPA) equation of state coupled with van der Waals-Platteeuw model for the hydrate phase. Although experimental results are considered satisfactory for both binary and ternary systems, higher deviations between our values and the simulated ones for the ternary system, considering peak temperature instead of the extrapolated onset as the hydrate dissociation temperature, are believed to be a consequence of dynamic effects that promote the formation of a heterogeneous hydrate and are negligible for the binary system.

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Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

Cited by 32 publications

References 28 publications

Investigation of natural gas hydrates formation/decomposition processes in systems consisting of “commercial asphaltene–resin–paraffin deposits and water”

Investigation of natural gas hydrates formation/decomposition processes in systems consisting of “commercial asphaltene–resin–paraffin deposits and water”

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Simulation and Experimental Study of Methane-Propane Hydrate Dissociation by High Pressure Differential Scanning Calorimetry

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