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VAPOUR-LIQUID EQUILIBRIUM PROPERTIES FOR GAS -

COLD LAKE BITUMEN

C.T. FU R. PUTTAGUNTA G. VILCSAK

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PETROLEUM SOCIETY OF CIM PAPER NO. 86-37-05 THIS IS A PREPRINT - SUBJECT TO CORRECTION VAPOUR-LIQUID EQUILIBRIUM PROPERTIES FOR GAS - COLD LAKE BITUMEN by Cheng-Tze Fu Rao Puttagunta George Vilcsak Alberta Research Council PUBLICATI ON RIGHTS RESERVED THIS PAPER IS TO BE PRESENTED AT THE 37th ANNUAL TECHNICAL MEETING OF THE PETROLEUM SOCIETY OF CIM HELD IN CALGARY, JUNE 8-11, 1986. DIS CUSSION OF THIS PAPER IS INVITED. SUCH DISCUSSION MAY BE PRESENTED AT THE TECHNICAL MEETING AND WILL BE CONSIDERED FOR PUBLICATION IN CIM JOURNALS IF FILED IN WRITING WITH THE TECHNICAL PROGRAM CHAIPRIOR TO THE CONCLUSION OF THE MEETING. ABSTRACT Vapour-liquid equilibrium properties of methane-Cold Lake bitumen and ethane-Cold Lake bitumen mixtures were measured using a modified Ruska rocking cell apparatus. The measured data of these two pseudo- binary systems at three isotherms were used to develop a predicting method by means of equations of state. Two equations of state; the modified Soave- Redlich-Kwong and the Peng- Robinson, were chosen in this study. With an appropriate choice of bitumen characterization parameters and binary interaction coefficients, it is sh

that both the equations of state can adequately represent the vapour liquid equilibrium properties of the two systems studied. Binary interaction coefficients of the modified Soave-Redlich-Kwong equation of state for the two systems were determined and correlated with temper- ature. INTRODUCTION Methane and ethane are commonly found in the native Cold Lake oil sands bitumen and these gases are con- sidered as possible additives to the steam-based in situ bitumen recovery methods. Thus, the phase beha- viour of the methane-Cold Lake bitumen and the ethane-Cold Lake bitumen mi

under in situ con- ditions are important to reservoir engineers for determining the recovery of bitumen from the oil sand deposits as well as to process engineers for 61 developing an adequate numerical simulation model. However, the experimental data for these systems are not reported in the literature. One of the major objectives of this study is to measure the vapour- liquid equilibrium (VLE) properties of methane-Cold Lake bitumen and ethane-Cold Lake bitumen mixtures. Experimental measurements are time consuming and costly for the bitumen containing systems. F

purpose of data reduction, it is desirable to find methods which can predict the VLE properties for these systems with high accuracy. In this investi- gation, two cubic equations of state were selected for the purpose of. representing phase equilibrium properties. These are the modified Soave-Redlich- Kwong (MSRK) equation of statel- 3 and the Peng- Robinson (PR) equation of state4, 5. A commercially available "EQUI-PHASE" software package developed by the DB Robinson & AssociateS6 was applied in vapour- liquid equilibrium cal culations for the PR equation of state.Calculations were also performed with PR equation of' state using the bitumen characterization paramet ers developed by Fu et al.10 and binary interaction coefficients determined in this study. The VLE properties measured in our laboratory are compared tci the calculated values for the two systems using both equations of state.

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