Experiments and prediction of phase equilibrium conditions for methane hydrate formation in the NaCl, CaCl2, MgCl2 electrolyte solutions

Du, Jiapei; Wang, Xuesong; Liu, Huang; Guo, Ping; Wang, Zhouhua; Fan, Shuanshi

doi:10.1016/j.fluid.2018.09.028

Cited by 55 publications

(35 citation statements)

References 31 publications

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“…Experimental phase equilibrium conditions of methane hydrate in pure water and aqueous solution of 10 wt % concentration of NaCl, NaBr, KCl, KBr, MgCl 2 , MgBr 2 , CaCl 2 , CaBr 2 , and ZnBr 2 . ,,,− ,, …”

Section: Results and Discussionmentioning

confidence: 99%

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Phase Equilibrium of Methane Hydrates in the Presence of MgBr₂, CaBr₂, and ZnBr₂ Aqueous Solutions

Bhawangirkar

Sangwai

2021

J. Chem. Eng. Data

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Hydrate formation in natural gas transportation pipelines and during completion and workover operations is considered to be a serious issue. CaBr 2 and ZnBr 2 salts are widely used to design high-density completion fluids for completion of oil and gas wells; however, information on the hydrate phase equilibria in the presence of these salts is missing. In this study, a threephase liquid water−hydrate−vapor (L-H-V) equilibrium conditions for methane hydrate in aqueous solutions of MgBr 2 , CaBr 2 , and ZnBr 2 at 0.1, 0.25, 0.5, 0.75, 1, 3, 5, 10, and 15 wt % in the temperature and pressure range of 276.5−285.4 K and 3.65−9.56 MPa have been reported using the isochoric pressure search method. A total of 129 phase equilibrium experiments have been performed. At low concentrations of the salt, that is, 0.1−0.75 wt %, the thermodynamic inhibition was found to be low and close to the methane hydrate equilibrium conditions in pure water. The inhibition effect is found to increase beyond 1 wt %, becomes significant after 3 wt % salt concentration, and is found to increase with an increase in the salt concentration. In accordance with the hydrated radius and ionic weight, the inhibition effect of salts on the methane hydrate phase equilibria is in the order of MgBr 2 > CaBr 2 > ZnBr 2 . The heat of dissociation (evaluated using the Clausius−Clapeyron equation) for methane hydrates in aqueous salt systems is found to be in the order of ZnBr 2 > CaBr 2 > MgBr 2 . This study will be useful to design efficient completion fluids for completion and workover operations for onshore and offshore oil and gas production operations.

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Section: Results and Discussionmentioning

confidence: 99%

“…Heat of dissociation of methane hydrate in pure water and aqueous solutions of 5 wt % MgBr 2 , CaBr 2 , and ZnBr 2 .Figure7. Experimental phase equilibrium conditions of methane hydrate in pure water and aqueous solution of 10 wt % concentration of NaCl, NaBr, KCl, KBr, MgCl 2 , MgBr 2 , CaCl 2 , CaBr 2 , and ZnBr 2 3,17,19,[24][25][26]43,44.…”

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confidence: 99%

Phase Equilibrium of Methane Hydrates in the Presence of MgBr₂, CaBr₂, and ZnBr₂ Aqueous Solutions

Bhawangirkar

Sangwai

2021

J. Chem. Eng. Data

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“…Hydrate phase equilibrium data for the methane + THF + TBAB + NaCl + water system: (▲) Pure water; (●) NaCl (0.05 mass fraction); (■) NaCl (0.05 mass fraction); and (⧫) THF + TBAB + NaCl (0.15 + 0.05 + 0.05 mass fractions-present work).…”

Section: Resultsmentioning

confidence: 98%

Hydrate Phase Equilibria of Methane + Mixed (TBAB + THF) in the Presence and Absence of NaCl and/or MgCl₂ Aqueous Solutions

et al. 2019

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Available water for the formation of natural gas hydrate at the industrial scale is normally saline water in which the dissolved salts inhibit the hydrate formation. To overcome this challenge, thermodynamic promoters can be used. In the present work, hydrate phase equilibria of methane + mixed promoters of tetrahydrofuran (THF) and tetra-n-butyl ammonium bromide (TBAB) were investigated in the absence and presence of NaCl, MgCl2, and NaCl + MgCl2 aqueous solutions. The phase equilibrium data, which were generated using an isochoric pressure-search method with a step heating technique, are reported in the pressure and temperature ranges of 1.09–5.16 MPa and 286.0–299.0 K, respectively. Equilibrium data show that an aqueous mixture of THF + TBAB (0.15 + 0.05 mass fractions) in the presence of NaCl systems is a more effective promoter compared to a single promoter TBAB or THF even at a high concentration of about 0.2 mass fraction.

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“…In addition, methane hydrate equilibrium conditions in both 2.0 and 3.0 wt % basic chromium sulfate were higher than methane hydrate equilibrium conditions in bulk water. The results suggested that basic chromium sulfate can work as a thermodynamic inhibitor to prevent methane hydrate formation like other salts, such as MgCl 2 , NaCl, and so on. In addition, methane hydrate equilibrium conditions in bulk water were close to methane hydrate equilibrium conditions in a basic chromium sulfate solution.…”

Section: Resultsmentioning

confidence: 99%

Hydrate-Based Method to Remove Cr(III) and Ni(II) in Chromium Hydroxide Sulfate and Nickel Sulfate Hexahydrate Solutions

Yang

Kang

et al. 2021

J. Chem. Eng. Data

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The hydrate-based method provides a potential method to remove heavy metal ions. In this work, the phase equilibrium conditions of methane hydrate in chromium hydroxide sulfate solutions and nickel sulfate hexahydrate solutions were first measured. The results suggested that the addition of both chromium hydroxide sulfate and nickel sulfate hexahydrate inhibited methane hydrate formation and acted as thermodynamic inhibitors. In addition, the removal efficiencies of both chromium hydroxide sulfate and nickel sulfate hexahydrate were also measured by forming methane hydrate at different hydration time. The results suggested that the chromium hydroxide sulfate removal efficiency reached 82.1% with a 23.7% yield of melting water at 274.2 K with a hydration time of 1 h, while nickel sulfate hexahydrate removal efficiency reached 67.5% with 68% yield of melting water at 274.2 K.

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Experiments and prediction of phase equilibrium conditions for methane hydrate formation in the NaCl, CaCl2, MgCl2 electrolyte solutions

Cited by 55 publications

References 31 publications

Phase Equilibrium of Methane Hydrates in the Presence of MgBr₂, CaBr₂, and ZnBr₂ Aqueous Solutions

Phase Equilibrium of Methane Hydrates in the Presence of MgBr₂, CaBr₂, and ZnBr₂ Aqueous Solutions

Hydrate Phase Equilibria of Methane + Mixed (TBAB + THF) in the Presence and Absence of NaCl and/or MgCl₂ Aqueous Solutions

Hydrate-Based Method to Remove Cr(III) and Ni(II) in Chromium Hydroxide Sulfate and Nickel Sulfate Hexahydrate Solutions

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Experiments and prediction of phase equilibrium conditions for methane hydrate formation in the NaCl, CaCl2, MgCl2 electrolyte solutions

Cited by 55 publications

References 31 publications

Phase Equilibrium of Methane Hydrates in the Presence of MgBr2, CaBr2, and ZnBr2 Aqueous Solutions

Phase Equilibrium of Methane Hydrates in the Presence of MgBr2, CaBr2, and ZnBr2 Aqueous Solutions

Hydrate Phase Equilibria of Methane + Mixed (TBAB + THF) in the Presence and Absence of NaCl and/or MgCl2 Aqueous Solutions

Hydrate-Based Method to Remove Cr(III) and Ni(II) in Chromium Hydroxide Sulfate and Nickel Sulfate Hexahydrate Solutions

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Phase Equilibrium of Methane Hydrates in the Presence of MgBr₂, CaBr₂, and ZnBr₂ Aqueous Solutions

Phase Equilibrium of Methane Hydrates in the Presence of MgBr₂, CaBr₂, and ZnBr₂ Aqueous Solutions

Hydrate Phase Equilibria of Methane + Mixed (TBAB + THF) in the Presence and Absence of NaCl and/or MgCl₂ Aqueous Solutions