Joule-Thomson expansion of high-pressure-high-temperature gas condensates

Kortekaas, W.G.; Peters, Cor J.; Arons, J. de Swaan

doi:10.1016/s0378-3812(97)00183-0

Cited by 36 publications

(25 citation statements)

References 18 publications

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“…However the Joule-Thomson coefficient is extremely difficult to measure in representative conditions because the temperature effect is very small with the low amount of gas sample available (a few hundreds of cm 3 ). Equation of state calculations are possible [36] but they have not been validated against measured Joule-Thomson coefficients, so that molecular simulation is a good candidate method.…”

Section: Properties Of Natural Gasesmentioning

confidence: 99%

Applications of Molecular Simulation in Oil and Gas Production and Processing

Ungerer¹,

Lachet²,

Tavitian³

2006

Oil & Gas Science and Technology - Rev. IFP

113

141

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Résumé -Applications de la simulation moléculaire à la production et au traitement du pétrole et du gaz -La simulation moléculaire est une technique émergente qui consiste à simuler un système de quelques centaines de molécules de façon très détaillée. Par des moyennes statistiques appropriées, on peut déterminer sur la base des résultats de cette simulation des propriétés d'équilibre et de transport qui peuvent être comparées à des résultats expérimentaux. Le but de l'article est de fournir au lecteur des notions de base sur les méthodes de simulation. Ensuite, des exemples d'application sont abordés qui couvrent divers domaines de l'industrie pétrolière. En ingénierie de réservoir, ces exemples ont trait aux propriétés d'équilibre des hydrocarbures lourds, aux propriétés thermiques des gaz naturels, ainsi qu'aux propriétés volumétriques et aux équilibres de phase des mélanges d'hydrocarbures et de gaz acides. Les applications du domaine de la production et du traitement sont illustrées par l'exemple des équilibres de phase impliquant le méthanol (couramment employé comme solvant ou comme inhibiteur d'hydrates) et celui de la solubilité des gaz dans les matériaux polymères à haute pression. En raffinage, c'est à la solubilité de l'hydrogène sulfuré dans les hydrocarbures à haute température que la simulation a été appliquée. Dans chacun de ces problèmes, la simulation a apporté des prédictions très utiles ainsi qu'une compréhension des causes profondes des relations entre la structure chimique et les propriétés des fluides. Elle fournit ainsi une voie intermédiaire à mi-chemin entre les mesures expérimentales et les modèles thermodynamiques classiques. Moins chère et plus rapide que de nouvelles mesures, elle peut améliorer la détermination des paramètres des modèles utilisés en routine. Abstract -Applications of Molecular Simulation in Oil and Gas Production and ProcessingMolecular simulation is an emerging technique which consists in performing a detailed simulation of microscopic systems involving typically a few hundreds of molecules. On the basis of these simulations

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Section: Properties Of Natural Gasesmentioning

confidence: 99%

Applications of Molecular Simulation in Oil and Gas Production and Processing

Ungerer¹,

Lachet²,

Tavitian³

2006

Oil & Gas Science and Technology - Rev. IFP

113

141

View full text Add to dashboard Cite

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“…Because this coefficient may be negative at high pressure (Kortekaas et al, 1998), HP-HT gas condensates could heat up upon isenthalpic expansion, so that temperatures could be higher than expected in producing wells. However, experimental measurements of the Joule-Thomson effect are necessary to validate these predictions.…”

Section: Resultsmentioning

confidence: 99%

Measurement and Prediction of Volumetric and Transport Properties of Reservoir Fluids At High Pressure

Sant’Ana

Ungerer

Batut

et al. 1998

Rev. Inst. Fr. Pét.

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Les dŽcouvertes de pŽtrole ou de gaz dans des conditions sŽv•res de tempŽrature (plus de 150¡C) ou de pression (plus de 50 MPa) se comptent dans plusieurs bassins ˆ travers le monde. En mer du Nord, on prŽvoit de mettre en production des gisements dont les conditions de fond vont jusqu'ˆ 110 MPa et 190¡C. Ces caractŽristiques constituent un dŽfi pour la prŽdiction des propriŽtŽs des fluides de gisement, aussi bien au niveau expŽrimental que thŽorique. In order to perform fluid studies for these reservoir conditions, IFP has developed a specific mercury-free high pressure apparatus with sapphire windows, a phase sampling device and viscosity determination by the capillary tube method. Its application is illustrated here using examples of real fluids and model mixtures.This equipment was first used to measure volumetric properties for gases. It has been shown that very high compressibility factors can be found with HP-HT gas condensates. This has a strong influence on recovery factors during primary depletion. In order to predict more accurately the volumetric properties of mixtures under these conditions, we propose to use a conventional equation of state, such as Peng-Robinson, with two improvements:Ð a modified temperature-dependent volume translation method, calibrated for high pressure density data; the method is simple, more accurate than other volume translation methods and fully consistent with lumping procedures; Ð a quadratic mixing rule on the covolume.Specific phase behavior can also be found. At low temperatures, wax crystallization can occur from a fluid which is a gas condensate at reservoir temperature. This feature is due to the simultaneous presence of abundant methane and heavy paraffins. A study of model fluids in a sapphire cell has allowed us to identify the possible types of phase diagrams.Although generally not considered to be an important parameter, gas viscosity may have some importance in the production of HP-HT accumulations, because of high flow rates. Viscosity models exhibit significant uncertainties because of large viscosity contrasts between the individual components of the reservoir fluid. In order to test and improve prediction methods, we started the acquisition of viscosity data under representative conditions. Special care was taken in the implementation of the capillary tube method, so that low viscosities (down to 0.02 mPa×s) could be measured with high accuracy at pressures up to 120 MPa on simple systems, such as methane, n-pentane, nitrogen, and nitrogen-pentane mixtures. As a result, it was possible to evaluate mixing rules for viscosity predictions. MEDICIîN Y PREDICCIîN DE LAS PROPIEDADES VOLUMƒTRICAS Y DE LAS PROPIEDADES DE TRANSPORTE DE LOS FLUIDOS DE YACIMIENTOS DE ALTA PRESIîNLos descubrimientos de petr-leo o de gas en condiciones severas de temperatura (m ‡s de 150¡C) o de presi-n (mas de 50 MPa) figuran en buen noemero de cuencas en todo el mundo. En el mar del Norte, se proyecta poner en producci-n yacimientos cuyas condiciones de fondo alcanzan los 110 MPa y...

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“…Compared with the actual values of J-T coefficients with that in Table 3, it is known that though P-R equation is more precise to calculate the compressibility factors of air, S-R-K equation gives better predictions in the Joule-Thomson coefficients. It is because the critical compressibility factor S-R-K equation chosen is closer to the real one [22,25]. The temperature change results which based on S-R-K analysis are used for the efficiency analysis.…”

Section: Joule-thomson Effect and The Temperature Change Of Throttle mentioning

confidence: 99%