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Moorjani B, Adhikari J, Hait S. Molecular insights into methane hydrate dissociation: Role of methane nanobubble formation. J Chem Phys 2024; 161:104703. [PMID: 39248242 DOI: 10.1063/5.0220841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Accepted: 08/20/2024] [Indexed: 09/10/2024] Open
Abstract
Understanding the underlying physics of natural gas hydrate dissociation is necessary for efficient CH4 extraction and in the exploration of potential additives in the chemical injection method. Silica being "sand" is already present inside the reservoir, making the silica nanoparticle a potential green additive. Here, molecular dynamics (MD) simulations have been performed to investigate the dissociation of the CH4 hydrate in the presence and absence of ∼1, ∼2, and ∼3 nm diameter hydrophilic silica nanoparticles at 100 bar and 310 K. We find that the formation of a CH4 nanobubble has a strong influence on the dissociation rate. After the initial hydrate dissociation, the rate of dissociation slows down till the formation of a CH4 nanobubble. We find the critical concentration and size limit to form the CH4 nanobubble to be ∼0.04 mole fraction of CH4 and ∼40 to 50 CH4 molecules, respectively. The solubility of CH4 and the chemical potential of H2O and CH4 are determined via Gibbs ensemble Monte Carlo simulations. The liquid phase chemical potential of both H2O and CH4 in the presence and absence of the nanoparticle is nearly the same, indicating that the effect of this additive will not be significant. While the formation of the hydration shell around the nanoparticle via hydrogen bonding confirms the strength of interactions between the water molecules and the nanoparticle in our MD simulations, the contact of the nanoparticle with the interface is infrequent, leading to no explicit effect of the nanoparticle on the dynamics of methane hydrate dissociation.
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Affiliation(s)
- Bhavesh Moorjani
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Jhumpa Adhikari
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Samik Hait
- Indian Oil Corporation Ltd. R&D Centre, Faridabad 121007, India
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2
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Liu S, Wang S, Luo J, Xu Y, Ren L, Xiang X, Geng T, Xu B, Guo L. Current Status and Development Trend of Research on Polymer-Based Kinetic Inhibitors for Natural Gas Hydrates. Polymers (Basel) 2024; 16:1985. [PMID: 39065301 PMCID: PMC11281086 DOI: 10.3390/polym16141985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Revised: 07/10/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
As the understanding of natural gas hydrates as a vast potential resource deepens, their importance as a future clean energy source becomes increasingly evident. However, natural gas hydrates trend towards secondary generation during extraction and transportation, leading to safety issues such as pipeline blockages. Consequently, developing new and efficient natural gas hydrate inhibitors has become a focal point in hydrate research. Kinetic hydrate inhibitors (KHIs) offer an effective solution by disrupting the nucleation and growth processes of hydrates without altering their thermodynamic equilibrium conditions. This paper systematically reviews the latest research progress and development trends in KHIs for natural gas hydrates, covering their development history, classification, and inhibition mechanisms. It particularly focuses on the chemical properties, inhibition effects, and mechanisms of polymer inhibitors such as polyvinylpyrrolidone (PVP) and polyvinylcaprolactam (PVCap). Studies indicate that these polymer inhibitors provide an economical and efficient solution due to their low dosage and environmental friendliness. Additionally, this paper explores the environmental impact and biodegradability of these inhibitors, offering guidance for future research, including the development, optimization, and environmental assessment of new inhibitors. Through a comprehensive analysis of existing research, this work aims to provide a theoretical foundation and technical reference for the commercial development of natural gas hydrates, promoting their safe and efficient use as a clean energy resource.
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Affiliation(s)
- Shujie Liu
- CNOOC Hainan Energy Co., Ltd., Haikou 570105, China; (S.L.); (Y.X.)
| | - Sunan Wang
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
| | - Jiansheng Luo
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
| | - Yilong Xu
- CNOOC Hainan Energy Co., Ltd., Haikou 570105, China; (S.L.); (Y.X.)
| | - Liangliang Ren
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
| | - Xiong Xiang
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
| | - Tie Geng
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
| | - Botao Xu
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
| | - Lei Guo
- China Oilfield Services Limited, Sanhe 065201, China; (J.L.); (L.R.); (X.X.); (T.G.); (B.X.); (L.G.)
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Gong L, Zhang S, Cai M, Li J, Lu Q, Zhang X. Combined gas well hydrate prevention and control technology and its application. PLoS One 2023; 18:e0295356. [PMID: 38060546 PMCID: PMC10703270 DOI: 10.1371/journal.pone.0295356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 11/18/2023] [Indexed: 12/18/2023] Open
Abstract
The high pressure in some gas wells, such as those in the Xushen gas field in Daqing, China, makes them susceptible to freezing and hydrate blockages. Downhole throttling technology is widely used to reduce costs during well construction, however, due to the limitations of temperature, pressure and depth structure, this technology is sometime applied independently in some gas wells in which freezing and blockages are a frequent problem that can seriously affect production capacity. Moreover, artificial alcohol injection of 'passive plugging' to prevent hydrate formation not only consumes significant amounts of methanol but its efficiency is also dependent on factors such as weather, personnel and equipment, so it is not a continuous solution. In order to solve the above problems, the mechanism of hydrate formation was analyzed in this study, from which a combined mechanical and chemical hydrate control process was developed. OLGA software was used to design the process parameters of the novel mechanical and chemical inhibition technology for hydrate prevention and control, and also to simulate and analyze the wellhead temperature, pressure and hydrate generation once the process was implemented. Based on the results of the parameters calculation, the downhole throttle and hydrate inhibitor automatic filling device are used to realize the functions of downhole throttle depressurization and hydrate inhibitor continuous filling, reduce the wellhead pressure and hydrate generation temperature, and ensure the continuous production of gas well. This novel combination process was subsequently tested in three wells in the Daqing gas oilfield. Measurements showed that the average daily gas increase from a single well was 0.5×104m3, methanol consumption was reduced from the original maximum daily amount of 1750 kg to just 60 kg, the manual maintenance workload was reduced by 80%, and the rate of the well openings was increased from 45% to 100%. These results proved that this technology is feasible and efficient for applications in gas wells with high downhole pressure and low wellhead temperature, and, thus, provides important technical support for the prevention of gas hydrate and improvement of gas well production.
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Affiliation(s)
- Leilei Gong
- Northeast Petroleum University, Daqing, China
- Research Institute of Oil Production Engineering, Daqing Oilfield Co., Daqing, China
- Heilongjiang Oil and gas Reservoir Production and Increase Focus Laboratory, Daqing, Heilongjiang Province, China
| | - Shujin Zhang
- Northeast Petroleum University, Daqing, China
- Research Institute of Oil Production Engineering, Daqing Oilfield Co., Daqing, China
- Heilongjiang Oil and gas Reservoir Production and Increase Focus Laboratory, Daqing, Heilongjiang Province, China
| | - Meng Cai
- Research Institute of Oil Production Engineering, Daqing Oilfield Co., Daqing, China
- Heilongjiang Oil and gas Reservoir Production and Increase Focus Laboratory, Daqing, Heilongjiang Province, China
| | - Junliang Li
- Research Institute of Oil Production Engineering, Daqing Oilfield Co., Daqing, China
- Heilongjiang Oil and gas Reservoir Production and Increase Focus Laboratory, Daqing, Heilongjiang Province, China
| | - Qiuyu Lu
- Research Institute of Oil Production Engineering, Daqing Oilfield Co., Daqing, China
- Heilongjiang Oil and gas Reservoir Production and Increase Focus Laboratory, Daqing, Heilongjiang Province, China
| | - Xiaochuan Zhang
- Research Institute of Oil Production Engineering, Daqing Oilfield Co., Daqing, China
- Heilongjiang Oil and gas Reservoir Production and Increase Focus Laboratory, Daqing, Heilongjiang Province, China
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4
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Adibifard M, Olorode O. Large-Scale Nonequilibrium Molecular Studies of Thermal Hydrate Dissociation. J Phys Chem B 2023; 127:6543-6550. [PMID: 37462521 PMCID: PMC11008782 DOI: 10.1021/acs.jpcb.3c03391] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/24/2023] [Indexed: 07/28/2023]
Abstract
The energy content of methane hydrate reservoirs (MHRs) is at least twice that of conventional fossil fuels. So, there is considerable interest in their commercial development by heating, among other dissociation mechanisms. However, a few researchers have highlighted the potentially uncontrollable release of methane from MHRs, which could occur because of global warming. Therefore, it is crucial to understand the kinetics of thermal hydrate dissociation to safely develop these resources and prevent the release of this greenhouse gas into the environment. Although there have been several molecular studies of thermal dissociation, most of these use small simulation domains that cannot capture the transient nature of the process. To address this limitation, we performed coarse-grained molecular dynamics (CGMD) simulations on a significantly larger domain with a hundred times more hydrate unit cells than those used in previous studies. We monitored the kinetics of dissociation using an image-processing algorithm and observed the dynamics of the process while maintaining a thermal gradient at the dissociation front. For the first time, we report the formation of an unstable secondary dissociation path that triggers gas bubbles within the solid hydrate. The kinetics of thermal dissociation appears to occur in three stages. In the first stage, the energy of the system increases until it exceeds the activation energy, and dissociation is initiated. Consistent dissociation occurs in the second stage, whereas the third stage involves the dissociation of the remaining hydrates across a nonplanar and heterogeneous interface.
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Affiliation(s)
- Meisam Adibifard
- Department
of Petroleum Engineering, Louisiana State
University, Baton
Rouge, Louisiana 70803, United States
| | - Olufemi Olorode
- Department
of Petroleum Engineering, Louisiana State
University, Baton
Rouge, Louisiana 70803, United States
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5
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Chaudhury A, Moorjani B, Chatterjee S, Adhikari J, Hait S. Molecular insights into the dissociation of carbon dioxide hydrates in the presence of an ionic liquid, [BMIM][PF6]. Chem Phys 2023; 571:111943. [DOI: 10.1016/j.chemphys.2023.111943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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6
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The synergistic effect between imidazole reagents and kinetic hydrate inhibitors. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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7
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Yang P, Guo D, Fang B. Dynamic Dissociation Behaviors of sII Hydrates in Liquid Water by Heating: A Molecular Dynamics Simulation Approach. ACS OMEGA 2022; 7:42774-42782. [PMID: 36467936 PMCID: PMC9713880 DOI: 10.1021/acsomega.2c04488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Accepted: 11/02/2022] [Indexed: 06/17/2023]
Abstract
An understanding of the dynamic behavior of subtle hydrate dissociation in the liquid water phase is fundamental for gas production from marine hydrate reservoirs. Molecular dynamics simulations are performed in this study to investigate the dissociation kinetics of pure propane and binary propane + methane sII hydrates in a liquid water environment. The results show that faster hydrate dissociation rates are observed at higher initial temperatures. The hydrate phase dissociates from the cluster surface to the inside in a layer-by-layer manner under the simulation temperature conditions, which is similar to the behavior of sI hydrates and is independent of the hydrate crystal type. Compared to the binary sII hydrate, the pure sII hydrate dissociates more easily under the same initial temperature conditions, which can be attributed to the stabilizing effect of guest molecules in the hydrate cages. The empty cages collapse in one step, in contrast to the two-step pathway induced by the guest-host interaction. In addition, a hydrocarbon phase forms in the binary hydrate dissociation system instead of nanobubbles. These results can provide molecular-level insights into the dynamic mechanism of hydrate dissociation and theoretical guidance for gas recovery by thermal injection from marine hydrate reservoirs.
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Affiliation(s)
- Peihan Yang
- School
of Mathematics and Physics, China University
of Geosciences, Wuhan430074, China
| | - Dongdong Guo
- School
of Earth and Environment, Anhui University
of Science & Technology, Huainan232001, China
| | - Bin Fang
- School
of Mathematics and Physics, China University
of Geosciences, Wuhan430074, China
- Process
and Energy Department, Delft University
of Technology, Leeghwaterstraat
39, 2628CBDelft, The Netherlands
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8
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Sujith K. Effect of methanol as an amphiphile on water structuring around a hydrate forming gas molecule: Insights from molecular dynamics simulations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Molecular Insights into Factors Affecting the Generation Behaviors, Dynamic Properties, and Interfacial Structures of Methane Gas Bubbles. WATER 2022. [DOI: 10.3390/w14152327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Molecular dynamics simulations were performed to study the effects of temperatures, pressures, and methane mole fractions on the generation behaviors, dynamic properties, and interfacial structures of methane gas bubbles. Methane gas bubbling can be promoted by high temperatures and high mole fractions of methane, which come from the generation of larger methane clusters in solution. Bubbles were found to be highly dynamic, with more methane molecules exchanging between bubbles and the surrounding solution at high pressures and in systems with high mole fractions of methane. The interfacial structures between bubbles and the surrounding solution were rough at a molecular level, and the roughness of the outermost methane and water molecules was high at high temperatures, low pressures, and in systems with high methane mole fractions. The dissolution of methane molecules depended on the interactions between the outermost methane and water molecules, which would become stronger with decreasing temperatures, increasing pressures, and decreasing methane mole fractions. The results obtained can help in understanding both the generation behaviors of bubbles when gas hydrates decompose and the re-nucleation behaviors of gas hydrates in the presence of bubbles.
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10
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Bai J, Liu D, Shang L, Lv Z, Zhai J, Zhao W, Zhang J. Effect of solid dispersants on the formation of hydrates in W/O emulsion systems: Micron and nanoscale. J DISPER SCI TECHNOL 2022. [DOI: 10.1080/01932691.2022.2067171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Junwen Bai
- College of Petroleum Engineering, Liaoning Petrochemical University, Fushun, China
| | - Dejun Liu
- College of Petroleum Engineering, Liaoning Petrochemical University, Fushun, China
| | - Liyan Shang
- College of Chemical Engineering and Environmental Engineering, Liaoning Petrochemical University, Fushun, China
| | - Zhenbo Lv
- College of Chemical Engineering and Environmental Engineering, Liaoning Petrochemical University, Fushun, China
| | - Jiaqi Zhai
- College of Petroleum Engineering, Liaoning Petrochemical University, Fushun, China
| | - Wenliang Zhao
- Shandong Natural Gas Pipeline Company, Shandong, China
| | - Jiashun Zhang
- Shandong Natural Gas Sales Center, Natural Gas Branch of China Petroleum & Chemical Corporation, Jinan Shandong, China
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11
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Zhao J, Jin J, Lv K, Sun J, Wang R, Wang J, Guo X, Hou Q, Liu J, Bai Y, Huang X, Liu J. Effects of PVP and NaCl on the decomposition of methane hydrate by MD simulation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Sholihah M, Sean WY. Numerical Simulation on the Dissociation, Formation, and Recovery of Gas Hydrates on Microscale Approach. Molecules 2021; 26:molecules26165021. [PMID: 34443609 PMCID: PMC8400366 DOI: 10.3390/molecules26165021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 08/13/2021] [Accepted: 08/16/2021] [Indexed: 11/16/2022] Open
Abstract
Investigations into the structures of gas hydrates, the mechanisms of formation, and dissociation with modern instruments on the experimental aspects, including Raman, X-ray, XRD, X-CT, MRI, and pore networks, and numerical analyses, including CFD, LBM, and MD, were carried out. The gas hydrate characteristics for dissociation and formation are multi-phase and multi-component complexes. Therefore, it was important to carry out a comprehensive investigation to improve the concept of mechanisms involved in microscale porous media, emphasizing micro-modeling experiments, 3D imaging, and pore network modeling. This article reviewed the studies, carried out to date, regarding conditions surrounding hydrate dissociation, hydrate formation, and hydrate recovery, especially at the pore-scale phase in numerical simulations. The purpose of visualizing pores in microscale sediments is to obtain a robust analysis to apply the gas hydrate exploitation technique. The observed parameters, including temperature, pressure, concentration, porosity, saturation rate, and permeability, etc., present an interrelationship, to achieve an accurate production process method and recovery of gas hydrates.
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13
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Su Z, Alavi S, Ripmeester JA, Wolosh G, Dias CL. Methane Clathrate Formation is Catalyzed and Kinetically Inhibited by the Same Molecule: Two Facets of Methanol. J Phys Chem B 2021; 125:4162-4168. [PMID: 33861613 DOI: 10.1021/acs.jpcb.1c01274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Here, we perform molecular dynamics simulations to provide atomic-level insights into the dual roles of methanol in enhancing and delaying the rate of methane clathrate hydrate nucleation. Consistent with experiments, we find that methanol slows clathrate hydrate nucleation above 250 K but promotes clathrate formation at temperatures below 250 K. We show that this behavior can be rationalized by the unusual temperature dependence of the methane-methanol interaction in an aqueous solution, which emerges due to the hydrophobic effect. In addition to its antifreeze properties at temperatures above 250 K, methanol competes with water to interact with methane prior to the formation of clathrate nuclei. Below 250 K, methanol encourages water to occupy the space between methane molecules favoring clathrate formation and it may additionally promote water mobility.
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Affiliation(s)
- Zhaoqian Su
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| | - Saman Alavi
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - John A Ripmeester
- National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
| | - Gedaliah Wolosh
- New Jersey Institute of Technology, Academic and Research Computing Systems, University Heights, Newark, New Jersey 07102, United States
| | - Cristiano L Dias
- New Jersey Institute of Technology, Department of Physics, University Heights, Newark, New Jersey 07102, United States
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Chen C, Hu W, Yang L, Zhao J, Song Y. Gas supersaturation and diffusion joint controlled CH4 nanobubble evolution during hydrate dissociation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114614] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Liu N, Zhou J, Hong C. Molecular dynamics simulations on dissociation of CO2 hydrate in the presence of inhibitor. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110894] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Hassanpouryouzband A, Joonaki E, Vasheghani Farahani M, Takeya S, Ruppel C, Yang J, English NJ, Schicks JM, Edlmann K, Mehrabian H, Aman ZM, Tohidi B. Gas hydrates in sustainable chemistry. Chem Soc Rev 2020; 49:5225-5309. [DOI: 10.1039/c8cs00989a] [Citation(s) in RCA: 247] [Impact Index Per Article: 61.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
This review includes the current state of the art understanding and advances in technical developments about various fields of gas hydrates, which are combined with expert perspectives and analyses.
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Affiliation(s)
- Aliakbar Hassanpouryouzband
- Hydrates, Flow Assurance & Phase Equilibria Research Group
- Institute of GeoEnergy Engineering
- School of Energy
- Geoscience, Infrastructure and Society
- Heriot-Watt University
| | - Edris Joonaki
- Hydrates, Flow Assurance & Phase Equilibria Research Group
- Institute of GeoEnergy Engineering
- School of Energy
- Geoscience, Infrastructure and Society
- Heriot-Watt University
| | - Mehrdad Vasheghani Farahani
- Hydrates, Flow Assurance & Phase Equilibria Research Group
- Institute of GeoEnergy Engineering
- School of Energy
- Geoscience, Infrastructure and Society
- Heriot-Watt University
| | - Satoshi Takeya
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba 305-8565
- Japan
| | | | - Jinhai Yang
- Hydrates, Flow Assurance & Phase Equilibria Research Group
- Institute of GeoEnergy Engineering
- School of Energy
- Geoscience, Infrastructure and Society
- Heriot-Watt University
| | - Niall J. English
- School of Chemical and Bioprocess Engineering
- University College Dublin
- Dublin 4
- Ireland
| | | | - Katriona Edlmann
- School of Geosciences
- University of Edinburgh
- Grant Institute
- Edinburgh
- UK
| | - Hadi Mehrabian
- Department of Chemical Engineering
- Massachusetts Institute of Technology
- Cambridge
- USA
| | - Zachary M. Aman
- Fluid Science & Resources
- School of Engineering
- University of Western Australia
- Perth
- Australia
| | - Bahman Tohidi
- Hydrates, Flow Assurance & Phase Equilibria Research Group
- Institute of GeoEnergy Engineering
- School of Energy
- Geoscience, Infrastructure and Society
- Heriot-Watt University
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17
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Sun X, Zhou G, Zhu J, Wu H, Lu G, Bai D. Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives. Chemphyschem 2019; 20:2553-2565. [PMID: 31448514 DOI: 10.1002/cphc.201900742] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/16/2019] [Indexed: 11/07/2022]
Abstract
The decomposition process of methane hydrate in pure water and methanol aqueous solution was studied by molecular dynamics simulation. The effects of temperature and pressure on hydrate structure and decomposition rate are discussed. The results show that decreasing pressure and increasing temperature can significantly enhance the decomposition rate of hydrate. After adding a small amount of methanol molecules, bubbles with a diameter of about 2 nm are formed, and the methanol molecules are mainly distributed at the gas-liquid interface, which greatly accelerates the decomposition rate and gas-liquid separation efficiency. The radial distribution function and sequence parameter analysis show that the water molecules of the undecomposed hydrate with ordered ice-like configuration at a temperature of 275 K evolve gradually into a long-range disordered liquid structure in the dynamic relaxation process. It was found that at temperatures above 280 K and pressures between 10 atm and 100 atm, the pressure has no significant effect on hydrate decomposition rate, but when the pressure is reduced to 1 atm, the decomposition rate increases sharply. These findings provided a theoretical insight for the industrial exploitation of hydrates.
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Affiliation(s)
- Xiaoliang Sun
- State Key Laboratory for heavy oil processing College of Science, China University of Petroleum (Beijing), Beijing, 102249, China
| | - Guanggang Zhou
- State Key Laboratory for heavy oil processing College of Science, China University of Petroleum (Beijing), Beijing, 102249, China
| | - Jianwei Zhu
- State Key Laboratory for heavy oil processing College of Science, China University of Petroleum (Beijing), Beijing, 102249, China
| | - Haicheng Wu
- State Key Laboratory for heavy oil processing College of Science, China University of Petroleum (Beijing), Beijing, 102249, China
| | - Guiwu Lu
- State Key Laboratory for heavy oil processing College of Science, China University of Petroleum (Beijing), Beijing, 102249, China
| | - Dongsheng Bai
- Department of Chemistry, School of Science, Beijing Technology and Business University, Beijing, 100048, China
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18
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19
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Veesam SK, Ravipati S, Punnathanam SN. Recent advances in thermodynamics and nucleation of gas hydrates using molecular modeling. Curr Opin Chem Eng 2019. [DOI: 10.1016/j.coche.2019.01.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Choudhary N, Hande VR, Roy S, Chakrabarty S, Kumar R. Effect of Sodium Dodecyl Sulfate Surfactant on Methane Hydrate Formation: A Molecular Dynamics Study. J Phys Chem B 2018; 122:6536-6542. [PMID: 29882664 DOI: 10.1021/acs.jpcb.8b02285] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In experimental studies, it has been observed that the presence of sodium dodecyl sulfate (SDS) significantly increases the kinetics of hydrate formation and the final water-to-hydrate conversion ratio. In this study, we intend to understand the molecular mechanism behind the effect of SDS on the formation of methane hydrate through molecular dynamics simulation. Hydrate formation conditions similar to that of laboratory experiments were chosen to study hydrate growth kinetics in 1 wt % SDS solution. We also investigate the effect of interactions with isolated SDS molecules on methane hydrate growth. It was observed that the hydrophobic tail part of the SDS molecule favorably interacts with the growing hydrate surface and may occupy the partial hydrate cages while the head groups remain exposed to water.
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Affiliation(s)
- Nilesh Choudhary
- Academy of Scientific and Innovative Research , Delhi-Mathura Road , New Delhi 110025 , India
| | - Vrushali R Hande
- Academy of Scientific and Innovative Research , Delhi-Mathura Road , New Delhi 110025 , India
| | | | - Suman Chakrabarty
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI , P.O. Bhimpur-Padanpur 752050 , Odisha , India
| | - Rajnish Kumar
- Department of Chemical Engineering , Indian Institute of Technology-Madras , Chennai 600036 , Tamilnadu , India
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Yuhara D, Brumby PE, Wu DT, Sum AK, Yasuoka K. Analysis of three-phase equilibrium conditions for methane hydrate by isometric-isothermal molecular dynamics simulations. J Chem Phys 2018; 148:184501. [DOI: 10.1063/1.5016609] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Affiliation(s)
- Daisuke Yuhara
- Department of Mechanical Engineering, Keio University, 3-4-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Paul E. Brumby
- Department of Mechanical Engineering, Keio University, 3-4-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - David T. Wu
- Chemistry Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - Amadeu K. Sum
- Hydrates Energy Innovation Lab, Chemical and Biological Engineering Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - Kenji Yasuoka
- Department of Mechanical Engineering, Keio University, 3-4-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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22
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Yagasaki T, Matsumoto M, Tanaka H. Adsorption of Kinetic Hydrate Inhibitors on Growing Surfaces: A Molecular Dynamics Study. J Phys Chem B 2018; 122:3396-3406. [PMID: 29278335 DOI: 10.1021/acs.jpcb.7b10356] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We investigate the mechanism of a typical kinetic hydrate inhibitor (KHI), polyvinylcaprolactam (PVCap), which has been applied to prevent hydrate plugs from forming in gas pipe lines, using molecular dynamics simulations of crystal growth of ethylene oxide hydrate. Water-soluble ethylene oxide is chosen as a guest species to avoid problems associated with the presence of the gas phase in the simulation cell such as slow crystal growth. A PVCap dodecamer adsorbs irreversibly on the hydrate surface which grows at supercooling of 3 K when the hydrophobic part of two pendent groups are trapped in open cages at the surface. The amide hydrogen bonds make no contribution to the adsorption. PVCap can adsorb on various crystallographic planes of sI hydrate. This is in contrast to antifreeze proteins, each of which prefers a specific plane of ice. The trapped PVCap gives rise to necessarily the concave surface of the hydrate. The crystal growth rate decreases with increasing surface curvature, indicating that the inhibition by PVCap is explained by the Gibbs-Thomson effect.
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Affiliation(s)
- Takuma Yagasaki
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Masakazu Matsumoto
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Hideki Tanaka
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
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Matsumoto M, Yagasaki T, Tanaka H. GenIce: Hydrogen-Disordered Ice Generator. J Comput Chem 2017; 39:61-64. [PMID: 29023825 PMCID: PMC5725672 DOI: 10.1002/jcc.25077] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 09/17/2017] [Accepted: 09/19/2017] [Indexed: 02/06/2023]
Abstract
GenIce is an efficient and user‐friendly tool to generate hydrogen‐disordered ice structures. It makes ice and clathrate hydrate structures in various file formats. More than 100 kinds of structures are preset. Users can install their own crystal structures, guest molecules, and file formats as plugins. The algorithm certifies that the generated structures are completely randomized hydrogen‐disordered networks obeying the ice rule with zero net polarization. © 2017 The Authors. Journal of Computational Chemistry Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Masakazu Matsumoto
- Division of Superconducting and Functional Materials, Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Takuma Yagasaki
- Division of Superconducting and Functional Materials, Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Hideki Tanaka
- Division of Superconducting and Functional Materials, Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
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24
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Xu J, Chen Z, Liu J, Sun Z, Wang X, Zhang J. A molecular dynamic study on the dissociation mechanism of SI methane hydrate in inorganic salt aqueous solutions. J Mol Graph Model 2017; 75:403-412. [PMID: 28666231 DOI: 10.1016/j.jmgm.2017.03.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 03/28/2017] [Accepted: 03/29/2017] [Indexed: 10/19/2022]
Abstract
Gas hydrate is not only a potential energy resource, but also almost the biggest challenge in oil/gas flow assurance. Inorganic salts such as NaCl, KCl and CaCl2 are widely used as the thermodynamic inhibitor to reduce the risk caused by hydrate formation. However, the inhibition mechanism is still unclear. Therefore, molecular dynamic (MD) simulation was performed to study the dissociation of structure I (SI) methane hydrate in existence of inorganic salt aqueous solution on a micro-scale. The simulation results showed that, the dissociation became stagnant due to the presence of liquid film formed by the decomposed water molecules, and more inorganic ions could shorten the stagnation-time. The diffusion coefficients of ions and water molecules were the largest in KCl system. The structures of ion/H2O and H2O/H2O were the most compact in hydrate/NaCl system. The ionic ability to decompose hydrate cells followed the sequence of: Ca2+>2K+>2Cl->2Na+.
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Affiliation(s)
- Jiafang Xu
- University of Petroleum (East China), Qingdao, China; National Engineering Laboratory for Subsea Equipment Testing and Detection Technology, China.
| | - Zhe Chen
- University of Petroleum (East China), Qingdao, China
| | | | - Zening Sun
- China United Coalbed Methane Corporation, Ltd., Taiyuan, China.
| | - Xiaopu Wang
- University of Petroleum (East China), Qingdao, China
| | - Jun Zhang
- University of Petroleum (East China), Qingdao, China.
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25
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Smirnov KS. A modeling study of methane hydrate decomposition in contact with the external surface of zeolites. Phys Chem Chem Phys 2017; 19:23095-23105. [DOI: 10.1039/c7cp01985h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Methane hydrate dissociates on the external surface of siliceous zeolites with methane absorbed by the solid and water forming a liquid-like phase.
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Affiliation(s)
- Konstantin S. Smirnov
- Laboratoire de Spectrochimie Infrarouge et Raman
- UMR 8516 CNRS – Université de Lille
- Sciences et Technologies
- 59655 Villeneuve d'Ascq
- France
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26
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Sujith KS, Ramachandran CN. Natural Gas Evolution in a Gas Hydrate Melt: Effect of Thermodynamic Hydrate Inhibitors. J Phys Chem B 2016; 121:153-163. [DOI: 10.1021/acs.jpcb.6b07782] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. S. Sujith
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - C. N. Ramachandran
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
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