Experimental determination of stability conditions of methane hydrate in aqueous calcium chloride solutions using high pressure differential scanning calorimetry

Kharrat, Mamdouh; Dalmazzone, Didier

doi:10.1016/s0021-9614(03)00121-6

Cited by 114 publications

(54 citation statements)

References 14 publications

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“…High-pressure differential scanning calorimetry (DSC) has recently received considerable attention due to its possible application for measuring the hydrate phase equilibrium conditions [14,[22][23][24][25][26][27][28][29][30][31]. In uninhibited system (no salts), the measurements of hydrate equilibrium conditions through DSC method were successfully conducted by several studies [27,28].…”

Section: High-pressure Differential Scanning Calorimetry (Dsc) Methodmentioning

confidence: 99%

“…In uninhibited system (no salts), the measurements of hydrate equilibrium conditions through DSC method were successfully conducted by several studies [27,28]. In addition, the hydrate equilibrium conditions in the presence of inhibitors were also measured through DSC method [14,22]. However, Lafond et al [4] pointed out the potential problems of the DSC method for inhibited systems, and introduced a novel technique for measuring hydrate equilibrium conditions in the presence of inhibitors.…”

Section: High-pressure Differential Scanning Calorimetry (Dsc) Methodmentioning

confidence: 99%

“…While there are numerous phase equilibria studies performed for hydrates at low salt concentrations (up to 3.5 wt%, seawater) [11][12][13][14], little data are available for hydrate equilibrium with high salt concentration (> 5 wt%). Moreover, no study has been reported on hydrate phase equilibria in the presence of ammonium chloride (NH4Cl), which is one of the main salts used in drilling fluids.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Methane hydrate phase equilibria for systems containing NaCl, KCl, and NH 4 Cl

Cha

Sum

2016

Fluid Phase Equilibria

104

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Section: High-pressure Differential Scanning Calorimetry (Dsc) Methodmentioning

confidence: 99%

Section: High-pressure Differential Scanning Calorimetry (Dsc) Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Methane hydrate phase equilibria for systems containing NaCl, KCl, and NH 4 Cl

Cha

Sum

2016

Fluid Phase Equilibria

104

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“…The experimental data are from Kharrat and Dalmazzone (2003). consider the factor of pore size and ignore factors of surface structure and mineral composition.…”

Section: Figurementioning

confidence: 99%

“…The sources of the experimental data are: 1. DeRoo et al (1983); 2 Kharrat and Dalmazzone (2003)Dholabhai et al (1991)…”

mentioning

confidence: 99%

The influence of temperature, pressure, salinity and capillary force on the formation of methane hydrate

Duan

Chen

et al. 2011

Geoscience Frontiers

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We present here a thermodynamic model for predicting multi-phase equilibrium of methane hydrate liquid and vapor phases under conditions of different temperature, pressure, salinity and pore sizes. The model is based on the 1959 van der WaalsePlatteeuw model, angle-dependent ab initio intermolecular potentials, the DMW-92 equation of state and Pitzer theory. Comparison with all available experimental data shows that this model can accurately predict the effects of temperature, pressure, salinity and capillary radius on the formation and dissociation of methane hydrate. Online calculations of the peT conditions for the formation of methane hydrate at given salinities and pore sizes of sediments are available on: www.geochem-model.org/models.htm. ª 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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Salinity‐buffered methane hydrate formation and dissociation in gas‐rich systems

et al. 2015

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Methane hydrate formation and dissociation are buffered by salinity in a closed system. During hydrate formation, salt excluded from hydrate increases salinity, drives the system to three-phase (gas, water, and hydrate phases) equilibrium, and limits further hydrate formation and dissociation. We developed a zero-dimensional local thermodynamic equilibrium-based model to explain this concept. We demonstrated this concept by forming and melting methane hydrate from a partially brine-saturated sand sample in a controlled laboratory experiment by holding pressure constant (6.94 MPa) and changing temperature stepwise. The modeled methane gas consumptions and hydrate saturations agreed well with the experimental measurements after hydrate nucleation. Hydrate dissociation occurred synchronously with temperature increase. The exception to this behavior is that substantial subcooling (6.4°C in this study) was observed for hydrate nucleation. X-ray computed tomography scanning images showed that core-scale hydrate distribution was heterogeneous. This implied core-scale water and salt transport induced by hydrate formation. Bulk resistivity increased sharply with initial hydrate formation and then decreased as the hydrate ripened. This study reproduced the salinity-buffered hydrate behavior interpreted for natural gas-rich hydrate systems by allowing methane gas to freely enter/leave the sample in response to volume changes associated with hydrate formation and dissociation. It provides insights into observations made at the core scale and log scale of salinity elevation to three-phase equilibrium in natural hydrate systems.

show abstract

Experimental determination of stability conditions of methane hydrate in aqueous calcium chloride solutions using high pressure differential scanning calorimetry

Cited by 114 publications

References 14 publications

Methane hydrate phase equilibria for systems containing NaCl, KCl, and NH 4 Cl

Methane hydrate phase equilibria for systems containing NaCl, KCl, and NH 4 Cl

The influence of temperature, pressure, salinity and capillary force on the formation of methane hydrate

Salinity‐buffered methane hydrate formation and dissociation in gas‐rich systems

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