Constant-Pressure Technique for Gas Diffusivity and Solubility Measurements in Heavy Oil and Bitumen

Etminan, S. Reza; Maini, Brij B.; Chen, Zhangxin; Hassanzadeh, Hassan

doi:10.1021/ef9008955

Cited by 130 publications

(84 citation statements)

References 18 publications

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“…Other researchers have proposed and developed different mathematical solutions by modeling the interface boundary condition differently. With dependence on how the interface boundary condition is defined, a range of simple to very complex solutions can be expected for this problem Mehrotra 2000, 2002;Civan and Rasmussen 2006;Rasmussen and Civan 2009;Tharanivasan et al 2004;Etminan et al 2010). It is evident that there is not a considerable error in using simple method for determination of diffusion coefficient.…”

Section: Determination Of Diffusion Coefficient From Pressure Datamentioning

confidence: 99%

Quantification of Density-Driven Natural Convection for Dissolution Mechanism in CO2 Sequestration

et al. 2011

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Dissolution of CO 2 into brine causes the density of the mixture to increase. The density gradient induces natural convection in the liquid phase, which is a favorable process of practical interest for CO 2 storage. Correct estimation of the dissolution rate is important because the time scale for dissolution corresponds to the time scale over which free phase CO 2 has a chance to leak out. However, for this estimation, the challenging simulation on the basis of convection-diffusion equation must be done. In this study, pseudo-diffusion coefficient is introduced which accounts for the rate of mass transferring by both convection and diffusion mechanisms. Experimental tests in fluid continuum and porous media were performed to measure the real rate of dissolution of CO 2 into water during the time. The pseudo diffusion coefficient of CO 2 into water was evaluated by the theory of pressure decay and this coefficient is used as a key parameter to quantify the natural convection and its effect on mass transfer of CO 2 . For each experiment, fraction of ultimate dissolution is calculated from measured pressure data and the results are compared with predicted values from analytical solution. Measured CO 2 mass transfer rate from experiments are in reasonable agreement with values calculated from diffusion equation performed on the basis of pseudo-diffusion coefficient. It is suggested that solving diffusion equation with pseudo diffusion coefficient herein could be used as a simple and rapid tool to calculate the rate of mass transfer of CO 2 in CCS projects.

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Section: Determination Of Diffusion Coefficient From Pressure Datamentioning

confidence: 99%

Quantification of Density-Driven Natural Convection for Dissolution Mechanism in CO2 Sequestration

et al. 2011

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“…The step changes in the pressure within the PVT cell in combination with a developed mathematical model were used to predict the diffusion coefficients. Later, Jamialahmadi et al (2006) and Etminan et al (2010) reported a new method for predicting diffusion coefficients of gases in heavy oil from experimental volume-time profiles. In this method, the volume changes of the PVT cell were recorded and used to calculate diffusion coefficients of gases in liquid hydrocarbon systems instead of the pressure changes.…”

Section: Introductionmentioning

confidence: 99%

Diffusion coefficients of natural gas in foamy oil systems under high pressures

et al. 2015

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The diffusion coefficient of natural gas in foamy oil is one of the key parameters to evaluate the feasibility of gas injection for enhanced oil recovery in foamy oil reservoirs. In this paper, a PVT cell was used to measure diffusion coefficients of natural gas in Venezuela foamy oil at high pressures, and a new method for determining the diffusion coefficient in the foamy oil was developed on the basis of experimental data. The effects of pressure and the types of the liquid phase on the diffusion coefficient of the natural gas were discussed. The results indicate that the diffusion coefficients of natural gas in foamy oil, saturated oil, and dead oil increase linearly with increasing pressure. The diffusion coefficient of natural gas in the foamy oil at 20 MPa was 2.93 times larger than that at 8.65 MPa. The diffusion coefficient of the natural gas in dead oil was 3.02 and 4.02 times than that of the natural gas in saturated oil and foamy oil when the pressure was 20 MPa. However, the gas content of foamy oil was 16.9 times higher than that of dead oil when the dissolution time and pressure were 20 MPa and 35.22 h, respectively.

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“…Many previous studies neglected interface mass transfer resistance and limited this parameter to the situations of very high mass transfer rates which are not encountered in many practical cases [5]. These research works, assumed an equilibrium boundary condition at the gas-liquid interface [6][7][8]; however, some studies put forward the theory of existence of the resistance at interface as a non-equilibrium boundary condition, and this new boundary condition was solved analytically in the form of an infinite Fourier series [9,10]. Employing such boundary condition will be important when a high pressure gas suddenly contacts with a liquid in which gas does not have enough time to reach equilibrium [11].…”

Section: List Of Symbolsmentioning

confidence: 99%

Evaluation of interfacial mass transfer coefficient as a function of temperature and pressure in carbon dioxide/normal alkane systems

et al. 2014

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CO 2 gas injection is known as one of the most popular enhanced oil recovery techniques for light and medium oil reservoirs, therefore providing an acceptable mass transfer mechanism for CO 2 -oil systems seems necessary. In this study, interfacial mass transfer coefficient has been evaluated for CO 2 -normal heptane and CO 2 -normal hexadecane systems using equilibrium and dynamic interfacial tension data, which have been measured using the pendant drop method. Interface mass transfer coefficient has been calculated as a function of temperature and pressure in the range of 313-393 K and 1.7-8.6 MPa, respectively. The results showed that the interfacial resistance is a parameter that can control the mass transfer process for some CO 2 -normal alkane systems, and cannot be neglected. Additionally, it was found that interface mass transfer coefficient increased with pressure. However, the variation of this parameter with temperature did not show a clear trend and it was strongly dependent on the variation of diffusivity and solubility of CO 2 in the liquid phase.

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Constant-Pressure Technique for Gas Diffusivity and Solubility Measurements in Heavy Oil and Bitumen

Cited by 130 publications

References 18 publications

Quantification of Density-Driven Natural Convection for Dissolution Mechanism in CO2 Sequestration

Quantification of Density-Driven Natural Convection for Dissolution Mechanism in CO2 Sequestration

Diffusion coefficients of natural gas in foamy oil systems under high pressures

Evaluation of interfacial mass transfer coefficient as a function of temperature and pressure in carbon dioxide/normal alkane systems

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