Viscosity Estimation for Bitumen-Diluent Mixtures

Miadonye, Adango; Singh, Birbal; Puttagunta, V.R.

doi:10.1080/08843759508947700

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…Mehrotra 33 developed a mixing rule for predicting viscosity of bitumen saturated with pure gases of N 2 , CO, CO 2 , C 1 , and C 2 . Miadonye et al 34 developed a viscosity correlation to predict the viscosity−temperature relationship for bitumen samples mixed with diluents. These diluents include Great Canadian Oil Sands Company (GCOS) synthetic crude, Mobil solvent, and naphtha.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO₂, C₃, and C₄ at High Temperatures

Eghbali

Dehghanpour

2019

Energy Fuels

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Coinjecting CO2 and light hydrocarbons with steam into oil sand reservoirs can improve the efficiency of the SAGD (steam assisted gravity drainage) process by reducing the steam oil ratio (SOR). The effects of these solvents on bitumen recovery enhancement depend on reservoir properties and operating conditions. To investigate the effects of solvents on bitumen viscosity in a solvent aided process, phase behaviors and viscosities of CO2–, C3–, and C4–bitumen systems were measured and modeled at high temperatures. Using the calibrated Peng–Robinson equation of state (PR-EOS), the solubilities of solvents in the Clearwater bitumen sample from the Cold Lake region were predicted. High-pressure and high-temperature equipment using an electromagnetic-based viscometer was customized to measure the viscosities of CO2–, C3–, and C4–bitumen mixtures. The measured viscosity data were used to calibrate a nonlinear viscosity model which was used to predict liquid phase viscosity as a function of solvent solubility and temperature. The effects of solvent dissolution on bitumen viscosity were investigated using PR-EOS and the calibrated viscosity model. The results show that dissolving CO2, C3, and C4 in bitumen decreases its viscosity. This viscosity reduction is lowest and highest in the case of CO2 and C4 dissolution, respectively. The effect of solvent dissolution on viscosity reduction is more pronounced at lower temperatures. EOS predictions and viscosity measurements indicate that increasing concentration of CO2, C3, and C4 above a certain threshold has a limited effect on reducing bitumen viscosity. At threshold solvent concentrations, bitumen viscosity can be reduced by 1.7, 5.6, and 15.2 times using CO2, C3, and C4, respectively, at 120 °C. Solubility and viscosity data suggest that C4 has the potential to be used in hot-solvent recovery methods in shallow and deep oil sand reservoirs. C3 may be a more effective solvent in deeper reservoirs which allow higher operating pressures. The modified viscosity model showed better performance than the Lobe and Shu correlations and logarithmic mixing rule. This model improves existing correlations for predicting viscosities of light solvent−bitumen mixtures since it requires less input data and does not require density data.

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Section: Introductionmentioning

confidence: 99%

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO₂, C₃, and C₄ at High Temperatures

Eghbali

Dehghanpour

2019

Energy Fuels

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“…It has been suggested, in our previous publications (1,9) , that possible asphaltene precipitation beyond a weight fraction of 20% could introduce a significant error in the experimental viscosity. However, since the correlation fits the entire data so well, it is arguable that the equation is valid even in the case of diesel.…”

Section: Correlation Of Mixtures Viscositymentioning

confidence: 98%

“…The reason for the large deviation exhibited by the diesel-bitumen mixture is not well known. It has been shown, however, that diesel has the highest tendency to form asphaltene precipitate with bitumen (1,(9)(10)(11) . This could possibly be the source of error in the experimental data.…”

Section: Correlation Of Diluent Mass Fractionmentioning

confidence: 99%

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Modelling Viscosity and Mass Fraction of Bitumen-Diluent Mixtures

Miadonye

Doyle

Britten

et al. 2001

Journal of Canadian Petroleum Technology

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In the recovery of bitumen, viscosity reduction becomes important, both below and above the ground. The addition of a liquid diluent is thought to break down or weaken the intermolecular forces which create high viscosity in bitumen (1) . The effect is so dramatic that the addition of even 5% diluent can cause a viscosity reduction in excess of 80%; thus, facilitating the in situ recovery and pipe line transportation of bitumen.The knowledge of the bitumen-diluent viscosity is highly important, since without it, calculations in upgrading process, in situ recovery, well simulation, heat transfer, fluid flow, and a variety of other engineering problems would be difficult or impossible to solve. This paper presents the development of a simple correlation to predict the viscosity of binary mixtures of bitumen-diluent in any proportion. AbstractThe viscosity model is an important component in enhanced oil recovery packages and, for pure bitumen, several accurate models are available. In this study, a simple correlation presented in an earlier publication is extended to predict the viscosity of bitumen-diluent mixtures, as well as the mass fraction required to reduce bitumen viscosity to pumping viscosity.In developing the viscosity model, viscosities of pure bitumen and diluent were used as the endpoints, and the diluent mass fraction was raised to a power of "n" (a viscosity reduction parameter) to account for the sharp drop in bitumen viscosity with increase in diluent mass fraction. The model was developed with 99 data points from three different bitumens and five diluents; spanning a viscosity range of 10 -1 to 10 6 mm 2 /s. The model was used to recalculate the viscosity and mass fraction values, and results compared with similar correlations by Cragoe and Chirinos. The best match was obtained with our correlation, with overall average absolute deviations of 12% and 5% for viscosity and mass fraction predictions, respectively. Predictions on data not used in developing the model showed an excellent match between experimental and predicted values, with an overall average absolute deviation of below 10% for viscosities of mixtures at 25˚ C, 60.3˚ C, and 82.6˚ C.

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“…Miadonye et al (1994) proposed a correlation for predicting bitumen viscosity that requires only a single viscosity measurement. Miadonye et al (1995) also developed a viscosity correlation to predict the viscosity/temperature relationship of bitumen mixed with various proportions of diluents (Great Canadian Oil Sands synthetic crude, mobile solvent, and naphtha). Miadonye et al (2000) proposed an equation for predicting the kinematic viscosity of bitumens and heavy oils mixed with diluents.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Correlation of Viscosity and Density for Compressed Athabasca Bitumen at Temperatures Up to 200ºC

Kariznovi

Nourozieh

Abedi

2014

Journal of Canadian Petroleum Technology

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The heavy-oil-and bitumen-recovery processes mainly intend to reduce the oil viscosity at the reservoir; therefore, the production and pipeline transportation of such viscous fluids require specific data on the viscosity and density of raw bitumen. In this study, the thermophysical properties of Athabasca bitumen were reported over a wide range of temperatures and pressures applicable for both in-situ-recovery methods and pipeline transportation of oil. The measurements were taken with our designed phase-behaviourexperimental apparatus, capturing the density and viscosity of Athabasca bitumen accurately at temperatures varying from ambient temperature up to 200 C and at pressures up to 10 MPa. The experimental density data for bitumen were correlated within 60.7 kg/m 3 with a newly developed algorithm to obtain the coefficients of correlation equations, considering the influence of pressure and temperature on the density. The viscosity data are correlated reasonably (within 69%) over the studied conditions with two correlations, which include two adjustable parameters each.

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Viscosity Estimation for Bitumen-Diluent Mixtures

Cited by 12 publications

References 9 publications

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO₂, C₃, and C₄ at High Temperatures

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO₂, C₃, and C₄ at High Temperatures

Modelling Viscosity and Mass Fraction of Bitumen-Diluent Mixtures

Measurement and Correlation of Viscosity and Density for Compressed Athabasca Bitumen at Temperatures Up to 200ºC

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Viscosity Estimation for Bitumen-Diluent Mixtures

Cited by 12 publications

References 9 publications

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO2, C3, and C4 at High Temperatures

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO2, C3, and C4 at High Temperatures

Modelling Viscosity and Mass Fraction of Bitumen-Diluent Mixtures

Measurement and Correlation of Viscosity and Density for Compressed Athabasca Bitumen at Temperatures Up to 200ºC

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Product

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About

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO₂, C₃, and C₄ at High Temperatures

An Experimental and Modeling Study on Interactions of Cold Lake Bitumen with CO₂, C₃, and C₄ at High Temperatures