An apparatus for phase equilibrium studies of carbon dioxide+heavy hydrocarbon systems

Han, Buxing; Peng, Ding‐Yu; Fu, Cheng-Tze; Vilcsak, G.

doi:10.1002/cjce.5450700617

Cited by 40 publications

(13 citation statements)

References 11 publications

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“…The mixture ( n -decane + carbon dioxide) was chosen to validate the apparatus through comparison with published experimental data. − Among these experimental data, the first experimental study was that of Reamer and Sage, who reported VLE composition and density data for various isotherms for T = 277.59–510.93 K and pressures up to critical conditions using a combination of both a synthetic technique for bubble point analysis and a sampling technique mainly used for the coexisting gas phase. The reported standard error in the mole fractions was ±0.0039 .…”

Section: Methodsmentioning

confidence: 99%

“…Isothermal pressure–composition ( p , x ) phase diagram for the ( n -decane (1) + carbon dioxide (2)) system at T = 311.0 K and T = 344.3 K. The filled symbols represent the data gathered during this work (▲ at T = 311.02 K and ⧫ at T = 344.31 K). The open symbols correspond to published experimental VLE phase equilibria at the isotherms: □, T = 310.93 K; × , T = 310.95 K; +, T = 311.0 K; ▽, T = 344.3 K; ○, T = 344.26 K; ◊, T = 344.25 K; ☆, T = 344.3 K; ∗, T = 344.25 K and Δ, T = 344.3 K …”

Section: Methodsmentioning

confidence: 99%

“…In the study of Chou et al 80 composition measurements at T = 344.25 K and T = 377.55 K were reported; an analyticaltype apparatus with recirculation of the vapor phase and off-line GC analyisis was used with a reported reproducibility between samples within (0.04x for liquid and (0.02y for vapor and estimated uncertainties of (0.005 and (0.002, respectively, for liquid and vapor mole fractions. Han et al 81 presented composition and density measurements for this system at T = 310.95 K and up to the critical pressure using an analytical technique with circulation of the gas and off-line analysis using sample cells as in the previous study; only the saturated liquidphase compositions were reported. A few composition measurements were also presented by Iwai et al 82 at T = 311.0 K and T = 344.3 K using an analytical apparatus in which both liquid and vapor were recirculated through their respective sampling valves.…”

Section: ' Experimental Sectionmentioning

confidence: 99%

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Experimental and Molecular Modeling Study of the Three-Phase Behavior of (n-Decane + Carbon Dioxide + Water) at Reservoir Conditions

2011

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Knowledge of the phase behaviour of mixtures of oil with carbon dioxide and water is essential for reservoir engineering, especially in the processes of enhanced oil recovery and geological storage of carbon dioxide. However, for a comprehensive understanding, the study of simpler systems needs to be completed. In this work the system (n-decane + carbon dioxide + water) was studied as a model (oil + carbon dioxide + water) mixture. To accomplish our aim, a new analytical apparatus to measure phase equilibria at high pressure was designed with maximum operating temperature and pressure of 423 K and 45 MPa, respectively. The equipment relies on recirculation of two coexisting phases using a two-channel magnetically operated micro-pump designed during this work, with sampling and on-line compositional analysis by gas chromatography. The apparatus has been validated by comparison with published isothermal vapour-liquid equilibrium data for the binary system (n-decane + carbon dioxide). New experimental data have been measured for the system (n-decane + carbon dioxide + water) under conditions of three-phase equilibria. Data for the three coexisting phases have been obtained on five isotherms at temperatures from (323 to 413) K and at pressures up to the point at which two of the phases become critical. The experimental work is 1 complemented here with a theoretical effort in which we developed models for these molecules within the framework of the statistical associating fluid theory for potentials of variable range (SAFT-VR). The phase behaviour of the three binary subsystems was calculated using this theory and, where applicable, a modification of the Hudson and McCoubrey combining rules was used to treat the systems predictively. The experimental data obtained for the ternary mixture are compared to the predictions of the theory. Furthermore, a detailed analysis of the ternary mixture is carried out based on comparison with available data for the constituent binary subsystems. In this way, we analysed the observed effects on the solubility when the third component was added.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ' Experimental Sectionmentioning

confidence: 99%

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Experimental and Molecular Modeling Study of the Three-Phase Behavior of (n-Decane + Carbon Dioxide + Water) at Reservoir Conditions

2011

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“…Sayegh et al (1990) developed an experimental apparatus for the measurements of the phase behavior and physical properties for CO 2 /heavy-oil mixtures and reported the experimental data for Lindbergh heavy oil. Han et al (1992) investigated experimentally the vapor/liquid equilibrium of a CO 2 /Peace-River-bitumen system at temperatures of 45 and 55 C. Kokal and Sayegh (1993) conducted a set of phase-behavior measurements for a Canadian heavy-oil/CO 2 system with its constitutive fractions. The phase-behavior data were reported at temperatures of 21 and 140 C and at several pressures up to 12.4 MPa.…”

Section: Literature Datamentioning

confidence: 99%

“…The coinjection of CO 2 with steam or the addition of CO 2 to steam for heavy-oil-and bitumen-recovery processes has been well-investigated in experiments (Redford 1982;Harding et al 1983;Leung 1983;Ivory et al 1985;Stone and Malcolm 1985;Stone and Nasr 1985;Butler and Yee 1986;Nasr et al 1987;Stone and Ivory 1987;Frauenfeld et al 1988;Metwally 1990;Hornbrook et al 1991;Gumrah and Okandan 1992;Freitag and Kristoff 1998;Bagci and Gumrah 2004).…”

Section: Introductionmentioning

confidence: 99%

Measurement and Correlation of Solubility and Physical Properties for Gas-Saturated Athabasca Bitumen

Nourozieh

Kariznovi

Abedi

2016

SPE Production &Amp; Operations

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The addition of hydrocarbon or nonhydrocarbon gases to steam can have a beneficial effect on the performance of steam-based processes for recovery of heavy and extraheavy oils. The performance of these newly developed techniques depends on the amount of solvent dissolved in the oil and the variation of oil viscosity with temperature. Thus, full understanding of the quantitative effects of the solvent on heavy-oil viscosity and phase behaviors is crucial for feasibility studies, design, and prediction of fieldscale processes.Thus, the aim of this research is the development of an understanding of the phase behavior of carbon dioxide (CO 2 )/Athabasca-bitumen mixtures. It includes both experimental and modeling studies of solubilities and saturated-liquid densities and viscosities over a wide range of temperatures (up to 200 C), approaching the conditions of in-situ steam processes and pressures up to 6 MPa.Experimental results indicate that the dissolved gas in bitumen leads to a significant oil-viscosity reduction, and the effect is greater at lower temperature and higher pressure. The gas-saturated-bitumen densities change slightly with the dissolution of CO 2 . The modeling results show that the measured solubilities are represented adequately by the modified Peng-Robinson equation of state (Robinson and Peng 1978), with an average absolute relative deviation (AARD) of 7.5%. The saturated-liquid densities are also correlated with equation-of-state and effective-liquid-density approaches, with 0.77 and 0.41% AARDs, respectively. The viscosity data are reasonably matched with the modified Pedersen corresponding state (Pedersen and Fredenslund 1987).

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2012

Dense Phase Carbon Dioxide

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An apparatus for phase equilibrium studies of carbon dioxide+heavy hydrocarbon systems

Cited by 40 publications

References 11 publications

Experimental and Molecular Modeling Study of the Three-Phase Behavior of (n-Decane + Carbon Dioxide + Water) at Reservoir Conditions

Experimental and Molecular Modeling Study of the Three-Phase Behavior of (n-Decane + Carbon Dioxide + Water) at Reservoir Conditions

Measurement and Correlation of Solubility and Physical Properties for Gas-Saturated Athabasca Bitumen

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