Experimental Analysis on the Probability Density Distribution of Methane Hydrate Induction Times in Porous Media

Wang, Shanrong; Yang, Mingjun; Li, Kehan

doi:10.1002/slct.201800154

Cited by 10 publications

(6 citation statements)

References 42 publications

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“…Zi et al revealed that silica sands could reduce the induction time for methane hydrate in a water-in-oil emulsion. Wang and co-workers − found that an increase in the particle size of sand significantly reduced the induction time for methane hydrate, while the induction time could be fitted to a log-normal distribution. However, Chen et al .…”

Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 99%

“…It is believed that hydroxylated solids can form a new interface with melted water after hydrate decomposition due to the presence of impurities, while the interface is known as an “imprint”. Although several hydrate reformation studies have been conducted involving solid particles, − the impurity imprinting mechanism has not been satisfactorily verified due to experimental visualization technology limitations. However, molecular dynamics simulations have confirmed the preference of hydrate nucleation on hydroxylated solid surfaces during the first formation, − which could guide the verification of this mechanism.…”

Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 99%

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Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Shi¹,

Song²,

Duan³

et al. 2021

Energy Fuels

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Natural gas hydrates (NGH) are prone to causing pipeline blockage in flow assurance, attracting considerable attention in the petroleum industry. This work reviews the significant progress in hydrate flow assurance research in China. Gas hydrate structures are briefly introduced to provide a basic understanding, while the application and development of hydrate management strategies in China are summarized. Subsequently, the development and improvement of hydrate phase equilibrium models are presented, which have been widely applied to the practical challenges of flow assurance. Moreover, kinetics research involving hydrate nucleation, growth, and decomposition are summarized, including nucleation mechanisms, induction time, memory effect, hydrate growth at different interfaces, hydrate growth at a microscopic level, and hydrate decomposition under different systems. The current research status of hydrate slurry flow is also analyzed in detail, covering the viscosity and flow resistance of hydrate slurry and the mechanisms of hydrate particle aggregation, deposition, and blockage. In addition, even though the numerical models of hydrate slurry multiphase flow have been sorted out, the accurate quantitative calculations and risk assessments are still in the initial stage, presenting significant room for improvement. Although substantial research progress has been made in China regarding gas hydrate flow assurance, considerable effort should be devoted to further understanding the intrinsic mechanism work to improve the applicability of various models. This review discusses the current developments, existing problems, and future prospects in the various basic hydrate flow assurance fields in China. It aims to provide readers with an overview of hydrate flow assurance research in China, hoping to provide a reference for developing this field.

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Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 99%

Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 99%

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Shi¹,

Song²,

Duan³

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Zi et al found that the presence of silica sand could greatly shorten the induction time of methane hydrate in the oil-in-water emulsion. Wang , et al increased the sand particle size and found that the induction time was significantly shortened. However, Chen et al reached a completely different conclusion: at the gas–water interface, the presence of sand particles could prevent methane gas from entering the water, inhibit the nucleation of hydrate, and lead to the increase of induction time.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Growth Kinetics of Natural Gas Hydrates in an Oil–Water Emulsion System

Zhang

Zhao

et al. 2021

ACS Omega

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In order to explore the growth kinetics characteristics of NGH (natural gas hydrate) in an oil and gas mixed transportation pipeline and ensure the safe transportation of the pipeline, with the high-pressure hydrate experimental loop, an experimental study on the growth characteristics of NGH in an oil–water emulsion system was carried out, and the effects of pressure, flow rate, and water cut on the hydrate induction time, gas consumption, consumption rate, and hydrate volume fraction were explored, and important experimental rules were obtained. The experiment was divided into three stages: in the rapid formation stage of the hydrate, the temperature and gas consumption rose sharply, and the pressure dropped suddenly. The induction time decreased with the increase of pressure, flow rate, and water cut. The induction time of 6 MPa was 86.13 min, which was shortened by 39.68% compared with the induction time of 142.8 min of 5 MPa. The induction time of 1500 kg/h was 88.27 min, which was shorter by 13.91% than that 102.53 min of 550 kg/h. The induction time of 20% water cut was 58.53 min, which was shorter by 13.99% than that 68.4 min of 15% water cut. The gas consumption and hydrate volume fraction were both increased with the increase of pressure and water cut and decreased with the increase in the flow rate. In the whole process of the formation of NGH, the consumption rate first increased and then decreased. The pressure-drop and apparent viscosity increased with the increase of hydrate volume fraction in a certain range. The sensitivity analysis of hydrate induction time based on the standard regression coefficient method showed that the initial pressure played a major role, followed by the flow rate and the water cut. Based on the sensitivity analysis of hydrate volume fraction by the gray correlation method, it was found that the hydrate volume fraction had the closest relationship with the initial pressure, followed by the flow rate and the water cut. Finally, the empirical formulas of induction time and hydrate volume fraction in an oil–water emulsion system were established.

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“…The induction time of hydrate reformation is dramatically reduced owing to the presence of the memory effect. 23−25 Many studies have proven that the memory effect could effectively promote hydrate reformation. 26−30 These studies found that porous media can highlight the memory effect in hydrate reformation.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the first hydrate formation that reflects the stochastic nature of nucleation possesses a long induction time, implying that more time and energy must be consumed, − which goes against the principle of cold storage at cost. , Therefore, many efforts, such as the use of surfactants and porous media, have been made to shorten the induction time. − Sodium dodecyl sulfate (SDS), as a perfect surfactant for enhancing hydrate formation, is widely used, but there is no consensus on the characteristics of cyclic hydrate reformation (excluding the first hydrate formation from cyclic hydrate formation). The induction time of hydrate reformation is dramatically reduced owing to the presence of the memory effect. − Many studies have proven that the memory effect could effectively promote hydrate reformation. − These studies found that porous media can highlight the memory effect in hydrate reformation . However, it remains unclear and controversial as to whether the memory effect maintains stability upon cyclic hydrate reformation, and related research is not comprehensive, especially in SDS systems or porous media.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Formation Stability of 1,1,1,2-Tetrafluoroethane Hydrate in Different SDS Solution Systems and Dissociation Characteristics Using Thermal Stimulation Combined with Depressurization

et al. 2019

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Cold storage using hydrates for cooling is a high-efficiency technology. However, this technology suffers from problems such as the stochastic nature of hydrate nucleation, cyclic hydrate formation instability, and a low cold discharge rate. To solve these problems, it is necessary to further clarify the characteristics of hydrate formation and dissociation in different systems. First, a comparative experimental study in pure water and sodium dodecyl sulfate (SDS) solution systems was conducted to explore the influence of SDS on the morphology of the hydrate and the time needed for its formation under visualization conditions. Subsequently, the cyclic hydrate formation stability was investigated at different test temperatures with two types of SDS solution systems—with or without a porous medium. The induction time, full time, and energy consumption time ratio of the first hydrate formation process and the cyclic hydrate reformation process were analyzed. Finally, thermal stimulation combined with depressurization was used to intensify hydrate dissociation compared with single thermal stimulation. The results showed that the growth morphology of hydrate and the time required for its formation in the SDS solution system were obviously different than those in pure water. In addition, the calculation and comparison results revealed that the induction time and full time of cyclic hydrate reformation were shorter and the energy consumption time ratio was smaller in the porous medium. The results indicated that a porous medium could improve the cyclic hydrate formation process by making it more stable and by decreasing time and energy costs. Thermal stimulation combined with depressurization at different backpressures (0.1, 0.2, 0.3, and 0.4 MPa) effectively promoted the decomposition of hydrates, and with the decrease in backpressure, the dissociation time decreased gradually. At a backpressure of 0.1 MPa, the dissociation time was reduced by 150 min. The experimental results presented the formation and dissociation characteristics of 1,1,1,2-tetrafluoroethane hydrates in different systems, which could accelerate the application of gas hydrates in cold storage.

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Experimental Analysis on the Probability Density Distribution of Methane Hydrate Induction Times in Porous Media

Cited by 10 publications

References 42 publications

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Experimental Study of the Growth Kinetics of Natural Gas Hydrates in an Oil–Water Emulsion System

Cyclic Formation Stability of 1,1,1,2-Tetrafluoroethane Hydrate in Different SDS Solution Systems and Dissociation Characteristics Using Thermal Stimulation Combined with Depressurization

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