Hydrate reformation characteristics in natural gas hydrate dissociation process: A review

Yang, Mingjun; Zhao, Jie; Zheng, Jia‐nan; Song, Yongchen

doi:10.1016/j.apenergy.2019.113878

Cited by 147 publications

(55 citation statements)

References 74 publications

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“…In field operation, temperature drop is an unwanted factor during hydrate production because of potential hydrate reformation risk [34]. However, we infer from the results that we could hardly avoid temperature drop by only increasing the number of steps or decreasing the magnitude of pressure drop in each step.…”

Section: Temperature Evolutionary Behaviormentioning

confidence: 85%

“…The depressurization parameters, which mainly include pressure-drop magnitude and depressurizing rate, would also affect gas production behaviors [9,[30][31][32]. Aggressive depressurization would increase gas production rate in a certain extent [5,33], but causes unpredictable occurrence of hydrate reformation [34]. There are many pathways to reach the same pressure-drop magnitude such as one-step quick depressurization and slow-stepwise depressurization [30].…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Study on Hydrate Production Using a Slow, Multistage Depressurization Strategy

et al. 2021

Geofluids

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Optimization of the depressurization pathways plays a crucial role in avoiding potential geohazards while increasing hydrate production efficiency. In this study, methane hydrate was formed in a flexible plastic vessel and then gas production processes were conducted at constant confining pressure and constant confining temperature. The CMG-STARS simulator was applied to match the experimental gas production behavior and to derive the hydrate intrinsic dissociation constant. Secondly, fluid production behavior, pressure-temperature ( P ‐ T ) responses, and hydrate saturation evolution behaviors under different depressurization pathways were analyzed. The results show that integrated gas-water ratio (IGWR) decreases linearly with the increase in depressurizing magnitude in each step, while it rises logarithmically with the increase in the number of steps. Under the same initial average hydrate saturation and the same total pressure-drop magnitude, a slow and multistage depressurization strategy would help to increase the IGWR and avoid severe temperature drop. The pore pressure rebounds logarithmically once the gas production is suspended, and would decrease to the regular level instantaneously once the shut-in operation is ended. We speculate that the shut-in operation could barely affect the IGWR and formation P ‐ T response in the long-term level.

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Section: Temperature Evolutionary Behaviormentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Laboratory Study on Hydrate Production Using a Slow, Multistage Depressurization Strategy

et al. 2021

Geofluids

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“…El proceso de disociación es considerado como un proceso endotérmico que produce agua y el gas que estaba encerrado dentro de la estructura del hidrato. La disociación de los hidratos consiste en la destrucción de la estructura del hidrato, la desorción de la molécula huésped de la superficie y la difusión del gas [8] y [23].…”

Section: Revisión Del Estado Del Arteunclassified

Estudio comparativo del comportamiento de algunas pectinas comerciales como inhibidores en la formación de hidratos de tetrahidrofurano

Urrego

Yánez

2020

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En esta investigación se evaluó el uso de pectinas comerciales como inhibidores en la formación de hidratos de tetrahidrofurano, en busca de aquellas que se comportaran de acuerdo con la premisa básica de un inhibidor cinético, se disminuyera la velocidad de la inducción ose retrasara la formación y crecimiento de los cristales de hidrato. Utilizando 20% v/v como la proporción más adecuada de tetrahidrofurano y variando el tipo y concentración de pectina, se realizó el enfriamiento paulatino de la solución formadora de hidratos. Se encontró que con una concentración de 0,1% de pectina de frutos cítricos esterificada y con 0,5% de pectina de frutos cítricos esterificada con sal de potasio se registraron los mayores tiempos para el periodo de inducción, y con la utilización de una concentración de 0,1% de pectina de frutos cítricos de bajo índice de metoxilo se registró el mayor tiempo para el periodo de crecimiento. Al final, todos los experimentos realizados terminaron con la aglomeración de los cristales de hidrato. Aquellas pectinas comerciales que mostraron resultados positivos como inhibidores en la formación de hidratos de tetrahidrofurano podrían también tener el potencial de inhibir la formación de hidratos de gas natural.

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“…Because of the Joule-Thomson effect, there will be secondary formation of gas hydrate in the gas production channels, wellbores, blowout preventers (BOP), and other parts under low temperature and high-pressure conditions. Severe blockage will affect the rate of gas migration or even block gas production channels, causing the risk of reducing gas production rate or even production shutdown [2][3][4][5][6][7]. In order to eliminate or suppress the secondary hydrate plug in the depressurization process, the supply of heat can restore the gas production efficiency theoretically.…”

Section: Introductionmentioning

confidence: 99%

Design and numerical simulation of a microwave antenna with coaxial slots for preventing secondary formation of gas hydrate

et al. 2021

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Gas hydrate is a new clean energy resource with polar molecule. However due to the change of temperature and pressure during extraction process, there will be secondary formation of gas hydrate, which usually occurs in reservoirs or pipelines near the wellhead. It is significance to prevent secondary formation of hydrate because of safety issues or production rate reduction caused by it. Theoretically, microwave heating can accelerate the decomposition of gas hydrate. Therefore, it is possible to use microwave radiation to prevent secondary formation of hydrate. In this paper, a microwave antenna with special shaped coaxial-slots was designed. Based on electromagnetics and antenna transmission theories, the key parameters of the coaxial-slot antenna were calculated. The frequency is 2.45 GHz, the impedance is 50 ohms, and ratio of outer to inner conductor radius is 3.32. The slots were designed as ‘H’-shape with the width is 2 mm, the radial length is 12mm, the axial length is 14 mm and the interval is 35 mm. Teflon was used as filling material and the radome. Then the software HFSS and ANSYS were used to analyze the electromagnetic field and temperature field to further optimize the parameters. It will be proved that the microwave antenna can heat gas hydrate and prevent the secondary formation.

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Hydrate reformation characteristics in natural gas hydrate dissociation process: A review

Cited by 147 publications

References 74 publications

Laboratory Study on Hydrate Production Using a Slow, Multistage Depressurization Strategy

Laboratory Study on Hydrate Production Using a Slow, Multistage Depressurization Strategy

Estudio comparativo del comportamiento de algunas pectinas comerciales como inhibidores en la formación de hidratos de tetrahidrofurano

Design and numerical simulation of a microwave antenna with coaxial slots for preventing secondary formation of gas hydrate

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