Effect of NaCl on methane hydrate formation and dissociation in porous media

Chong, Zheng Rong; Chan, Adeline Hui Min; Babu, P. Ramesh; Yang, Mingjun; Linga, Praveen

doi:10.1016/j.jngse.2015.08.055

Cited by 115 publications

(87 citation statements)

References 54 publications

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“…It is interesting to note that Chong et al . 28 , have reported similar observations in methane hydrates formed in the presence of NaCl (1.5 and 3.0 wt%) in a silica bed reactor. Those authors stated that the presence of NaCl induces a delay (1.5 times to pure water) in hydrate formation and also about 30% decrease in the hydrate conversion between NaCl solutions with 0.0 wt% and 3.0 wt%.…”

Section: Resultssupporting

confidence: 70%

Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Prasad

Kiran

2019

Sci Rep

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Gas hydrate, a solid transformed from an ensemble of water and gaseous molecules under suitable thermodynamic conditions, is present in marine and permafrost strata. The ability of methane hydrates to exist outside of its standard stability zone is vital in many aspects, such as its utility in gas storage and transportation, hydrate-related climate changes and gas reservoirs on the planet. A systematic study on the stability of methane hydrates divulges that the gas uptake decreased by about 10% by increasing the NaCl content to 5.0 wt%. The hydrate formation kinetic is relatively slower in a system with higher NaCl. The self-preservation temperature window for hydrate systems with NaCl 1.5, 3.0 and 5.0 wt% dramatically shifted to a lower temperature (252 K), while it remained around 270 K for NaCl 0.0 and 0.5 wt%. Based on powder x-ray diffraction and micro-Raman spectroscopic studies, the presence of hydrohalite (NaCl·2H 2 O) phase was identified along with the usual hydrate and ice phases. The eutectic melting of this mixture is responsible for shifting the hydrate stability to 252 K. A systematic lattice expansion of cubic phase infers the interaction between NaCl and water molecules of hydrate cages.

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Section: Resultssupporting

confidence: 70%

Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Prasad

Kiran

2019

Sci Rep

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“…Linga et al [61]investigated the behaviour of CH4-hydrate formation created by this method in sandy media. Other studies involving hydrate formation by the same method investigates several aspects of the process, e.g., the effect of porous media type and grain size [70], [71], aqueous phase saturation (SA) [72], salt concentration [73], and reactor configuration [74], [75]. Only one of these excess-gas studies [61] mentions heterogeneity in the spatial distribution of the hydrate saturation (SH) formed in the porous media, and this is done only in qualitative terms.…”

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confidence: 99%

Numerical analysis of experimental studies of methane hydrate formation in a sandy porous medium

et al. 2018

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Highlights • MH formation via excess-water method was numerically analyzed using T+H v1.5. • MH formation is determined as a kinetic reaction with dominant thermal processes controlling MH formation. • Flow, thermal, and kinetic rate parameters are optimized using a historymatching technique. • The spatial distributions of various phases at the end of the MH formation are strongly heterogeneous.

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“…Figure 9(a–c) evaluate the performance of the proposed framework comparing with that of the existing model 39 with reference to the experimental data 40 of CH 4 hydrate dissociation in the presence of silica sand, along with pure water, and 1.5 wt% and 3.0 wt% salt solution, respectively. In all these three cases, the operating pressure and temperature are 4.8 MPa and 297.2 K, respectively.…”

Section: Resultsmentioning

confidence: 99%

Modeling recovery of natural gas from hydrate reservoirs with carbon dioxide sequestration: Validation with Iġnik Sikumi field data

Palodkar

Jana

2019

Sci Rep

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Fundamental understanding of guest gas replacement in hydrate reservoirs is crucial for the enhanced recovery of natural gas and carbon dioxide (CO2) sequestration. To gain physical insight into this exchange process, this work aims at developing and validating a clathrate hydrate model for gas replacement. Most of the practical concerns associated with naturally occurring gas hydrates, including hydrate formation and dissociation in interstitial pore space between distributed sand particles in the presence of salt ions and in irregular nanometer-sized pores of those particles, irregularity in size of particles and shape of their pores, interphase dynamics during hydrate formation and decay, and effect of surface tension, are addressed. An online parameter identification technique is devised for automatic tuning of model parameters in the field. This model is employed to predict the laboratory-scale data for methane hydrate formation and decomposition. Subsequently, the model is validated with the field data of the Prudhoe Bay Unit on the Alaska North Slope during 2011 and 2012. In this Iġnik Sikumi field experiment, mixed CO2 (i.e., CO2 + N2) is used as a replacement agent for natural gas recovery. It is observed that the proposed formulation secures a promising performance with a maximum absolute average relative deviation (AARD) of about 2.83% for CH4, which is even lower, 0.84% for CO2 and 1.67% for N2.

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Effect of NaCl on methane hydrate formation and dissociation in porous media

Cited by 115 publications

References 54 publications

Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Numerical analysis of experimental studies of methane hydrate formation in a sandy porous medium

Modeling recovery of natural gas from hydrate reservoirs with carbon dioxide sequestration: Validation with Iġnik Sikumi field data

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