Gas hydrate formation condition: Review on experimental and modeling approaches

Shahnazar, Sheida; Hasan, Nurul

doi:10.1016/j.fluid.2014.07.012

Cited by 84 publications

(36 citation statements)

References 151 publications

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“…With respect to equations mentioned above, the alternating conditional expectation algorithm developed by (4) and (5) involved two stage operation processes, including (i) estimation of conditional expectations and (ii) iterative minimization of error variance ( 2 ). Though iterative process of minimizing the error variance ( 2 ), the real-valued measurable zero-mean functions ( ), = 1, 2, .…”

Section: Methodsmentioning

confidence: 99%

“…The most leading host molecule is water and the most common guest molecules include light hydrocarbons (CH 4 ), hydrogen sulfide (H 2 S), carbon dioxide (CO 2 ), hydrogen (H 2 ), and nitrogen (N 2 ). Accurate calculation of natural gas hydrate formation phase equilibrium conditions not only is essential for an optimized design scheme of natural gas production, processing, and transportation (flow assurance), but also is of great significance for preventing [1,2] subsea/land oil and gas transport pipeline blockage, promoting the development of gas transmission and separation techniques [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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A Graphical Alternating Conditional Expectation to Predict Hydrate Phase Equilibrium Conditions for Sweet and Sour Natural Gases

Zhong

Yao

Wang³

et al. 2019

Mathematical Problems in Engineering

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Natural gas hydrate has been widely of concern due to its great potential in application to address problems including gas storage, transmission, separation techniques, and also as energy resource. Accurate prediction of hydrate formation phase equilibrium conditions is essential for the optimized design during natural gas production, processing, and transportation. In this study, a novel graphical alternating conditional expectation (ACE) algorithm was proposed to predict hydrate formation phase equilibrium conditions for sweet and sour natural gases. The accuracy and performance of the presented ACE model were evaluated using 1055 data points (688, 249, and 118 data points for sweet natural gas, CO2-CH4, and H2S-CO2-CH4 systems, respectively) collected from literature. Meanwhile, a comparative study was conducted between the ACE model and commonly used correlations, including thirteen models for sweet natural gases, three models for CO2-CH4 binary system, and seven thermodynamic models for H2S-CO2-CH4 ternary system. The obtained results indicated that the proposed ACE model produces the best results in prediction of hydrate phase equilibrium temperature for sweet natural gases and pressure for CO2-CH4 system with average absolute relative deviation (AARD) of 0.134% and 2.75%, respectively. The proposed quick and explicit ACE model also provides a better performance in prediction of hydrate phase equilibrium pressure for H2S-CO2-CH4 ternary systems with AARD=5.20% compared with seven thermodynamic methods considered in this work, except for CPA/Electrolyte/Chen–Guo combined model (AARD=4.45%).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Graphical Alternating Conditional Expectation to Predict Hydrate Phase Equilibrium Conditions for Sweet and Sour Natural Gases

Zhong

Yao

Wang³

et al. 2019

Mathematical Problems in Engineering

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“…Among the different methods of modeling phase equilibria of gas hydrates [39][40][41][42][43], the thermodynamic model of van der Waals and Platteeuw was coupled with Kihara interaction potential in the present study. Given the fact that the assumptions in the model are restrictive, but it could works for many cases to predict phase behavior of clathrate hydrates [44].…”

Section: Thermodynamic Modelmentioning

confidence: 99%

PVTx measurements of mixed clathrate hydrates in batch conditions under different crystallization rates: Influence on equilibrium

Babakhani

Bouillot

Douzet

et al. 2018

The Journal of Chemical Thermodynamics

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Notwithstanding the numerous studies about classical temperature and pressure equilibrium of mixed gas hydrates, few provide hydrate composition and volume at local and final equilibrium under batch conditions. Therefore, required new phase equilibrium data for mixed gas hydrates including CO 2-C 3 H 8 , C 2 H 6-nC 4 H 10 , CH 4-nC 4 H 10 , CO 2-C 2 H 6-C 3 H 8 , CH 4-C 2 H 6-nC 4 H 10 and CH 4-C 2 H 6-C 3 H 8-nC 4 H 10 are presented in this paper. Moreover, results contain hydrate phase properties such as hydrate volume and density, storage capacity, water conversion and guest composition in all phases (vapor, liquid and hydrate). Importantly, effect of crystallization rate on final state has been evaluated. Finally the experimental results were compared to the thermodynamic model of van der Waals and Platteeuw to investigate kinetic effects. Experimental results show that equilibrium pressures at final state are dissimilar with respect to the crystallization rate. Furthermore, the hydrate volume formed at slow crystallization rate is noticeably lower than at quick. Noticeably, storage capacity in the case of slow crystallization is higher which could be crucial for industry. Also, the guest composition in hydrate phase at final state differs. Enclathration of heavier molecules is more significant at slow crystallization rate, and the hydrate phase seems to be more homogeneous according to the thermodynamic study. Indeed, modeling results, that assume the hydrate phase to be homogeneous in composition, show better agreement with the slow crystallization results for both equilibrium pressure and guest distribution in hydrate phase. This elucidates that, at quick crystallization rate, thermodynamic equilibrium cannot be reached. In conclusion, how kinetics influence the design of clathrate hydrate based industrial applications such as energy storage and transportation, carbon capture sequestration etc. are demonstrated.

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“…Generally speaking, hydrate is a snow-like solid, forming spontaneously at high pressure and low temperature by contact of low molecular weight gas species and water molecules (Chen et al 2009). Although main research works on hydrate have been commenced after observing blockage of gas flow lines by Hammerschmidt (1934), however, fast growth of publications implies interest of scientists in this subject (Shahnazar and Hasan 2014;Dehaghani and Badizad 2016a;Shadman et al 2016). On the one hand, petroleum industry has been suffered from economic and technical issues associated with hydrate formation during natural gas transmission, and on the other hand, broad advantages such as gas storage and separation show promising side of hydrates (Lucia et al 2014;Dehaghani and Badizad 2016b).…”

Section: Significance Of Cubic Equations Of State (Eos)mentioning

confidence: 99%

“…Also, hydrate is a safe form of gas storage, particularly for environmentally hazardous gases such as CO 2 (Pearson et al 1983). Depending on thermodynamic conditions, gas species form different clathrate structures, namely sI, sII and sH; each includes cages of varying shape and size (Shahnazar and Hasan 2014). To achieve advantages of hydrate or control its formation, an engineer primarily needs an accurate knowledge of hydrate formation conditions.…”

Section: Significance Of Cubic Equations Of State (Eos)mentioning

confidence: 99%

New insight into prediction of phase behavior of natural gas hydrate by different cubic equations of state coupled with various mixing rules

Dehaghani

2017

Pet. Sci.

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Progress in hydrate thermodynamic study necessitates robust and fast models to be incorporated in reservoir simulation softwares. However, numerous models presented in the literature makes selection of the best, proper predictive model a cumbersome task. It is of industrial interest to make use of cubic equations of state (EOS) for modeling hydrate equilibria. In this regard, this study focuses on evaluation of three common EOSs including Peng-Robinson, Soave-Redlich-Kwong and Valderrama-Patel-Teja coupled with van der Waals and Platteeuw theory to predict hydrate P-T equilibrium of a real natural gas sample. Each EOS was accompanied with three mixing rules, including van der Waals (vdW), Avlonitis non-density dependent (ANDD) and general nonquadratic (GNQ). The prediction of cubic EOSs was in sufficient agreement with experimental data and with overall AARD% of less than unity. In addition, PR plus ANDD proved to be the most accurate model in this study for prediction of hydrate equilibria with AARD% of 0.166. It was observed that the accuracy of cubic EOSs studied in this paper depends on mixing rule coupled with them, especially at high-pressure conditions. Lastly, the present study does not include any adjustable parameter to be correlated with hydrate phase equilibrium data.

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Gas hydrate formation condition: Review on experimental and modeling approaches

Cited by 84 publications

References 151 publications

A Graphical Alternating Conditional Expectation to Predict Hydrate Phase Equilibrium Conditions for Sweet and Sour Natural Gases

A Graphical Alternating Conditional Expectation to Predict Hydrate Phase Equilibrium Conditions for Sweet and Sour Natural Gases

PVTx measurements of mixed clathrate hydrates in batch conditions under different crystallization rates: Influence on equilibrium

New insight into prediction of phase behavior of natural gas hydrate by different cubic equations of state coupled with various mixing rules

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