Phase stability and kinetics of methane hydrate formation in presence of calcium and magnesium carbonate

Chaturvedi, Ekta; Patidar, Krishan; Laik, Sukumar; Mandal, Ajay

doi:10.1080/1064119x.2018.1443181

Cited by 9 publications

(5 citation statements)

References 42 publications

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“…Proper selection of the MW of kinetic hydrate inhibitors can produce macroscopic behavior similar to those recently reported experimental studies, in which an increase in the induction time and decrease in the hydrate formation rate were observed in the presence of such salts as CaCO 3 , MgCO 3 , NaCl, and CaCl 2 , demonstrating the inhibition of hydrate formation. − At present, there are comprehensive models proposed to describe and interpret the clathrate hydrate dynamics with porous particles and in saltwater. , These models of clathrate hydrate dynamics are complex and interesting and could be of value to verify experimental data in the presence of mixtures of kinetic inhibitors, porous particles, and saltwater in the future.…”

Section: Discussionsupporting

confidence: 60%

Dependence of the Kinetic Hydrate Inhibition Effect of Poly(N-vinylpyrrolidone) upon the Molecular Weight Is Influenced by Water Mobility in Millisecond Dynamics

Laroui

et al. 2020

Energy Fuels

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Explosive formation of a natural gas clathrate hydrate in production lines has been a technical bottleneck in ocean field natural gas drilling and gas transport. To mitigate this problem, polymer inhibitors can be used as a low-dosage kinetic inhibitor during operation. Key factors affecting the physicochemical performance of a benchmark inhibitor, poly(N-vinylpyrrolidone) (PVP),are not yet completely known. It is found here that the ability of PVP to delay the rapid crystal growth of the clathrate hydrate is correlated to the surrounding water dynamics. PVP can produce immobilized non-freezable water molecules with fast transverse relaxation on a sub-millisecond to millisecond time scale as revealed by nuclear magnetic resonance relaxometry. The unique water dynamics are also determined as a form of non-freezable bound water measured by differential scanning calorimetry. Changes in the molecular weight of PVP lead to changes in the entire inhibition time before the rapid growth of the hydrate crystals, and an optimal size of the PVP chain is found for the best inhibition. The hydrate crystallization rate constants are lowered by 1−2 orders of magnitude when the PVP chains have near the optimal size, further providing an explanation of the chain length dependence of the inhibition time.

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Section: Discussionsupporting

confidence: 60%

Dependence of the Kinetic Hydrate Inhibition Effect of Poly(N-vinylpyrrolidone) upon the Molecular Weight Is Influenced by Water Mobility in Millisecond Dynamics

Laroui

et al. 2020

Energy Fuels

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“…Chaturvedi et al focused on the stability and kinetic properties of natural gas hydrates in aqueous solutions of CaCO 3 and MgCO 3 , analyzing the behavior of hydrate formation in the presence of carbonates and different salts. The results show that hydrate formation is inhibited in the presence of CaCO 3 and MgCO 3 . Hydrate reservoir matrices are unconsolidated, weakly consolidated, or fractured sediments.…”

Section: Introductionmentioning

confidence: 93%

“…The results show that hydrate formation is inhibited in the presence of CaCO 3 and MgCO 3 . 9 Hydrate reservoir matrices are unconsolidated, weakly consolidated, or fractured sediments. The extraction of hydrates will cause changes in the strength, porosity, and effective stress of the hydrate reservoir.…”

Section: Introductionmentioning

confidence: 99%

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

et al. 2022

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It is of great significance to study the mechanical properties of hydrate-bearing sediments for safe and efficient exploitation of hydrate resources. Considering the lack of studies on clay-bearing fine-grained reservoirs, submarine clay taken from the Shenhu Sea in the South China Sea and quartz sand were used to synthesize hydrate-bearing clayey-silty sediments (HBCS). A series of consolidated-drained tests were carried out to investigate the effects of hydrate saturation, effective confining pressure, and their coupling on the mechanical properties of HBCS. The results show that with the increase in hydrate saturation and the decrease in effective confining pressure, the stress–strain curve of the HBCS shows a trend from strain hardening to strain softening. The peak strength and residual strength increase with the increase in effective confining pressure and hydrate saturation. The secant modulus E 50 increases with the increase in hydrate saturation and shows an irregular change trend with the increase in effective confining pressure. The contact area between particles determines the change rule of Secant modulus E 50. With the increase in hydrate saturation, the cohesion first increased rapidly and then increased slowly. The internal friction angle increases with the increase in hydrate saturation, but the increase is small. This indicates that hydrate has a great influence on the cohesion of sediments, but a small influence on the internal friction angle.

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“…Another work that studied the kinetics of hydrate formation at low salt concentrations examined the formation of tetrahydrofuran hydrate in sodium halides, 23 where they noticed that the rate of hydrate formation decreases in the salt concentration range of 0−0.6 wt %, increases in the range of 0.6−1.2 wt %, and then decreases again as the salt concentration increases above 1.2 wt %. Chaturvedi et al 24 studied the kinetics of methane hydrates in the presence of CaCO 3 and MgCO 3 , which inhibited the hydrate formation. Gas consumption and solubility of methane in water were lower in the presence of CaCO 3 and MgCO 3 , and the inhibition effect was even higher when CaCO 3 / MgCO 3 was added to sea water due to the additional salts present in sea water.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Methane Hydrate Inhibition in MgBr₂, CaBr₂, and ZnBr₂ Solutions

2023

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Hydrate inhibition in the presence of high-density completion fluids such as bromide salts relevant in completion and workover operations and natural gas transportation pipelines is less studied in the literature. In this work, an experimental investigation has been carried out to study the kinetics of methane hydrate formation and dissociation in the presence of MgBr 2 , CaBr 2 , and ZnBr 2 solutions at 1, 3, 5, 10, and 15 wt % concentrations to understand the effect of these salts on hydrate inhibition compared to pure water. The presence of salts decreases the moles of methane consumed, and the consumption decreases with an increase in the salt concentration. A stronger hydrate inhibition is observed in the presence of MgBr 2 solution than in CaBr 2 and ZnBr 2 . The hydrate formation rate decreased with the passage of time, but the rate was higher later if there were two induction points, such as in the case of 3, 5, and 10 wt % solutions of MgBr 2 and 5 wt % solutions of CaBr 2 . The water-to-hydrate conversion (W−H) and the gas-to-hydrate conversion (G−H) decrease with an increase in concentration of the salt. The maximum reduction in W−H and G− H conversions observed is ∼55% when MgBr 2 is present in 15 wt % concentrations compared to pure water. The number of moles of methane recovered during hydrate dissociation is maximum in the case of pure water, followed by ZnBr 2 solutions, while for CaBr 2 and MgBr 2 solutions, it is almost the same when these salts are in 15 wt % concentrations. The hydrate dissociation rate is the highest in the case of pure water, but there are intervals of time when the dissociation rate in the MgBr 2 and CaBr 2 solutions observed is higher than that in pure water.

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Phase stability and kinetics of methane hydrate formation in presence of calcium and magnesium carbonate

Cited by 9 publications

References 42 publications

Dependence of the Kinetic Hydrate Inhibition Effect of Poly(N-vinylpyrrolidone) upon the Molecular Weight Is Influenced by Water Mobility in Millisecond Dynamics

Dependence of the Kinetic Hydrate Inhibition Effect of Poly(N-vinylpyrrolidone) upon the Molecular Weight Is Influenced by Water Mobility in Millisecond Dynamics

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

Kinetics of Methane Hydrate Inhibition in MgBr₂, CaBr₂, and ZnBr₂ Solutions

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Phase stability and kinetics of methane hydrate formation in presence of calcium and magnesium carbonate

Cited by 9 publications

References 42 publications

Dependence of the Kinetic Hydrate Inhibition Effect of Poly(N-vinylpyrrolidone) upon the Molecular Weight Is Influenced by Water Mobility in Millisecond Dynamics

Dependence of the Kinetic Hydrate Inhibition Effect of Poly(N-vinylpyrrolidone) upon the Molecular Weight Is Influenced by Water Mobility in Millisecond Dynamics

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

Kinetics of Methane Hydrate Inhibition in MgBr2, CaBr2, and ZnBr2 Solutions

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Kinetics of Methane Hydrate Inhibition in MgBr₂, CaBr₂, and ZnBr₂ Solutions