Study of hydrate formation in gas-emulsion multiphase flow systems

Ruan, Chaoyu; Ding, Luyi; Shi, Bohui; Huang, Qiyu; Gong, Jing

doi:10.1039/c7ra09269e

Cited by 17 publications

(8 citation statements)

References 25 publications

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“…The freezing temperatures were −0.1 • C for sand 1 and sand 2; −0.2 • C for silt 1; −0.9 • C for saline silt 2, and −1.4 • C for silt 3. The phase transition parameters in gas saturated soil samples can be inferred from pressure and temperature variations in the test cell [43,[48][49][50]. This data was used to calculate the parameters at any time during the experiment.…”

Section: Methodsmentioning

confidence: 99%

Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling

Chuvilin

Davletshina

2018

Geosciences

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Favorable thermobaric conditions of hydrate formation and the significant accumulation of methane, ice, and actual data on the presence of gas hydrates in permafrost suggest the possibility of their formation in the pore space of frozen soils at negative temperatures. In addition, today there are several geological models that involve the formation of gas hydrate accumulations in permafrost. To confirm the literature data, the formation of gas hydrates in permafrost saturated with methane has been studied experimentally using natural artificially frozen in the laboratory sand and silt samples, on a specially designed system at temperatures from 0 to −8 • C. The experimental results confirm that pore methane hydrates can form in gas-bearing frozen soils. The kinetics of gas hydrate accumulation in frozen soils was investigated in terms of dependence on the temperature, excess pressure, initial ice content, salinity, and type of soil. The process of hydrate formation in soil samples in time with falling temperature from +2 • C to −8 • C slows down. The fraction of pore ice converted to hydrate increased as the gas pressure exceeded the equilibrium. The optimal ice saturation values (45−65%) at which hydrate accumulation in the porous media is highest were found. The hydrate accumulation is slower in finer-grained sediments and saline soils. The several geological models are presented to substantiate the processes of natural hydrate formation in permafrost at negative temperatures.

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Section: Methodsmentioning

confidence: 99%

Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling

Chuvilin

Davletshina

2018

Geosciences

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“…When the multiphase system is simulated with the flow conditions using magnetic stirrer with a suitable RPM, the emulsions are formed within the system. These emulsions effects the gas hydrates formation because of the Void fraction and liquid hold up 37,38 . The thermodynamic equilibrium points are determined based on the P-T curve.…”

Section: Discussion and Resultsmentioning

confidence: 99%

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Sayani

Pedapati

Lal

2020

Sci Rep

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This research is focused on understanding the phase behavior of gas hydrate formation in the gas dominant multiphase pipelines containing mixed gas with high CO2, crude oil, and deionized water. The experimental conditions are in the pressure range of 3–7 MPa with water cut as 20% of the volume. Initially, the effect of high CO2 content in natural gas on the phase boundary conditions of hydrates is studied through simulation (CSMGEM software) and experiments. Later, an additional phase of crude oil was introduced, with 15% of the volume to study the multiphase system. From the experimental analysis, thermodynamic equilibrium conditions were found, and the hydrate-liquid–vapor-equilibrium (HLVE) curves were drawn. The phase behavior is comprehended by comparing the HLVE curves of pure and multiphase systems. It is found that the high CO2 content tends to promote the gas hydrate formation. Based on the results, temperature variance and enthalpy of formation were calculated for the multiphase system. With a difference of 1.32 average temperature variance, the multiphase system exhibits inhibition. A basic statistical regression model was made to predict the gas hydrate formation in multiphase transmission pipelines. This work helps in understanding the effect of a new phase on gas hydrate formation.

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“…Ruan et al 68 studied the effect of gas and liquid flow rates on hydrate nucleation induction time in a gas-emulsion multiphase flow system, using a high-pressure flow loop (Figure 9). As the liquid flow rate increases, the induction time becomes higher, which differs from the conclusion obtained in a pseudosingle-phase flow system by Lv et al 59 and a stirred reactor by Turner.…”

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

Self Cite

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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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Study of hydrate formation in gas-emulsion multiphase flow systems

Abstract: Hydrate crystallization and formation in a gas and WO emulsion multiphase flow system.

Cited by 17 publications

References 25 publications

Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling

Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

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

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