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Molecular dynamics investigations into the hydrogen permeation mechanism of polyethylene pipeline material. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Li H, Zhang X, Chu H, Qi G, Ding H, Gao X, Meng J. Molecular Simulation on Permeation Behavior of CH4/CO2/H2S Mixture Gas in PVDF at Service Conditions. Polymers (Basel) 2022; 14:polym14030545. [PMID: 35160533 PMCID: PMC8839053 DOI: 10.3390/polym14030545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/21/2022] [Accepted: 01/24/2022] [Indexed: 11/16/2022] Open
Abstract
Reinforced thermoplastic composite pipes (RTPs) have been widely used for oil and gas gathering and transportation. Polyvinylidene fluoride (PVDF) has the greatest potential as a thermoplastic liner of RTPs due to its excellent thermal and mechanical properties. However, permeation of gases is inevitable in the thermoplastic liner, which may lead to blister failure of the liner and damage the safe operation of the RTPs. In order to clarify the permeation behavior and obtain the permeation mechanism of the mixture gas (CH4/CO2/H2S) in PVDF at the normal service conditions, molecular simulations were carried out by combining the Grand Canonical Monte Carlo (GCMC) method and the Molecular Dynamics (MD) method. The simulated results showed that the solubility coefficients of gases increased with the decrease in temperature and the increase in pressure. The adsorption isotherms of all gases were consistent with the Langmuir model. The order of the adsorption concentration for different gases was H2S > CO2> CH4. The isosteric heats of gases at all the actual service conditions were much less than 42 kJ/mol, which indicated that the adsorption for all the gases belonged to the physical adsorption. Both of the diffusion and permeation coefficients increased with the increase in temperature and pressure. The diffusion belonged to Einstein diffusion and the diffusion coefficients of each gas followed the order of CH4 > CO2 > H2S. During the permeation process, the adsorption of gas molecules in PVDF exhibited selective aggregation, and most of them were adsorbed in the low potential energy region of PVDF cell. The mixed-gas molecules vibrated within the hole of PVDF at relatively low temperature and pressure. As the temperature and pressure increase, the gas molecules jumped into the neighboring holes occasionally and then dwelled in the holes, moving around their equilibrium positions.
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Affiliation(s)
- Houbu Li
- State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, China; (H.L.); (G.Q.); (H.D.)
| | - Xuemin Zhang
- School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;
- Correspondence:
| | - Huifang Chu
- School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;
| | - Guoquan Qi
- State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, China; (H.L.); (G.Q.); (H.D.)
| | - Han Ding
- State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, China; (H.L.); (G.Q.); (H.D.)
| | - Xiong Gao
- Shaanxi Yanchang Petroleum Northwest Rubber LLC, Xianyang 712023, China;
| | - Jixing Meng
- Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096, China;
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Abstract
The enormous cost of handling the challenges of flow assurance in subsea wells, flowlines, and risers, especially in deepwater applications, has necessitated a proactive approach to prevent their risk of occurrence. To ensure that transportation of the hydrocarbon is economical and efficient from the subsea wellhead to the processing units, a flow assurance heat management system is relevant in the design and planning of a fluid transport system. Consequently, the advancement of new technologies to serve the increasing need by exploring the technologically challenging and hostile subsea fields is of great importance. A comparative study on heat management systems in flowlines was conducted from the top five publishers (Elsevier, Springer, Taylor & Francis, Wiley, and Sage) based on the number of publications to determine the level of work done by researchers in the last decade, the figures from the study showed the need for scientific research in the field of active heating. Additionally, a review was implemented to ascertain the likely advantages and drawbacks of each technique, its limitations concerning field applications and then recommend suitable cost-effective technique(s). The active heating system gives the most cost-effective solution for subsea deepwater fields.
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Saaoui D, Benali S, Mincheva R, Habi A, Dubois P, Raquez J. Impact of organoclays on the phase morphology and the compatibilization efficiency of immiscible poly(ethylene terephthalate)/poly(ε‐caprolactone) blends. J Appl Polym Sci 2020. [DOI: 10.1002/app.48812] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dalila Saaoui
- Laboratoire des Matériaux Organiques, Faculté de TechnologieUniversité Abderrahmane Mira, Route de Targa Ouzemour 06000 Bejaia Algeria
- Center of Innovation and Research in Materials and Polymers (CIRMAP), Research Institute for Materials Science and EngineeringUniversity of Mons‐ UMONS, Place du Parc 20, B‐7000 Mons Belgium
| | - Samira Benali
- Center of Innovation and Research in Materials and Polymers (CIRMAP), Research Institute for Materials Science and EngineeringUniversity of Mons‐ UMONS, Place du Parc 20, B‐7000 Mons Belgium
| | - Rosica Mincheva
- Center of Innovation and Research in Materials and Polymers (CIRMAP), Research Institute for Materials Science and EngineeringUniversity of Mons‐ UMONS, Place du Parc 20, B‐7000 Mons Belgium
| | - Abderrahmane Habi
- Laboratoire des Matériaux Organiques, Faculté de TechnologieUniversité Abderrahmane Mira, Route de Targa Ouzemour 06000 Bejaia Algeria
| | - Philippe Dubois
- Center of Innovation and Research in Materials and Polymers (CIRMAP), Research Institute for Materials Science and EngineeringUniversity of Mons‐ UMONS, Place du Parc 20, B‐7000 Mons Belgium
| | - Jean‐Marie Raquez
- Center of Innovation and Research in Materials and Polymers (CIRMAP), Research Institute for Materials Science and EngineeringUniversity of Mons‐ UMONS, Place du Parc 20, B‐7000 Mons Belgium
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Influence of high pressures on CH4, CO2 and H2S solubility in polyethylene: Experimental and molecular simulation approaches for pure gas and gas mixtures. Modelling of the sorption isotherms. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.04.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Neela V, von Solms N. Permeability, diffusivity and solubility of carbon dioxide in fluoropolymers: an experimental and modeling study. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0401-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kannan M, Bhagawan SS, Thomas S, Joseph K. Nanoclay effect on transport properties of thermoplastic polyurethane/polypropylene (TPU/PP) blends. JOURNAL OF POLYMER RESEARCH 2013. [DOI: 10.1007/s10965-013-0201-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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