Effect of CO2 Concentration in Injecting Gas on Minimum Miscibility Pressure: Compositional Model and Experimental Study

Document Type: Research Article

Authors

1 EOR Research Department, Research Institute of Petroleum Industry (RIPI), Tehran, I.R. IRAN

2 Faculty of Chemical Engineering, Amirkabir University of Technology, Tehran, I.R. IRAN

Abstract

For technical and economic success of miscible gas injection projects, an accurate laboratory measurement of Minimum Miscibility Pressure (MMP) at reservoir conditions is essential. On the other hand, compositional reservoir simulator is a useful tool in gas injection studies and prediction of MMP. The main goal of this paper is to describe a procedure to generate a three phase sequential type of compositional reservoir simulator. The solution method is completely addressed. A compositional thermodynamic program for equilibrium calculation, and pseudo-component determination was developed. Another purpose of this study is to prepare an experimental setup for investigating the effect of CO2 concentration in injecting gas on oil recovery and MMP.Some displacement tests using slim tube apparatus were performed and recoveries and MMPs were measured. Finally, experimental results were compared with the model predictions. A good agreement was achieved between the experimental data and model predictions.

Keywords

Main Subjects


[1] Watts J.W., Reservoir Simulation: Past, Present and Future, paper SPE 38441, proceedings of the 14th SPE Symposium on Reservoir Simulation,  Dallas, TX, June 8-11 (1997).
[2] Kazemi H., Vestal C.R., Shank G.D., An Efficient Multicomponent Numerical Simulator, SPE Journal., (Oct. 1978), p. 355 (1978).
[3] Fussell L.T., Fussell, D.D., An Iterative Technique for Compositional Reservoir Models, SPE Journal,
(Aug. 1979), p. 211 (1979).
[4] Young L.C., Stephenson R.E., A Generalized Compositional Approach for Reservoir Simulation,  SPE Journal, (Oct. 1983), p. 728 (1983).
[5] Watts J.W., Paper SPE 12244 presented at the 1983 Reservoir Simulation Symposium, San Francisco, Nov. 15-18. (1983).
[6] Wang P., Wheeler Y.M., Arbogast T., Dawson C., Parashar, M.,  and Sepehrnoori, K.,  A Fully Implicit Parallel EOS Compositional Simulator for Large Scale Reservoir Simulation, paper SPE 51885 presented at the 15th  Symposium on Reservoir Simulation. Houston, Texas (1997).
[7] Jessen K., Orr Jr. F.M., Gravity Segregation and Compositional Reservoir Simulation, Paper SPE 89448 Presented at the  14th Symposium on Improved Oil Recovery, Tulsa, Oklahoma, (2004).
[8] Datta-Gupta A., King M.J., A Semi Analytical Approach to Tracer Flow Modelling in Hetrogenous Permeable Media, Advances in Water Resources, 18, p. 9 (1995).
[9] Thiele M.R., Batycky R.P., Blunt M.J., Orr Jr. F.M., Simulation Flow in Hetrogeneous Media Using Streamtubes and Streamlines, SPE Reservoir Engineering, 10(1), p. 5 (1996).
[10] Crane M., Bratvedt F., Bratvedt K., Olufsen R., A Fully Compositional Streamline Simulator, Paper SPE 63156 Presented at the SPE Annual Technical Conference and Exhibition, Dallas, TX, October (2000).
[11] Ichiro O., Datta-Gupta A., King M.J., Paper SPE 79688 Presented at the SPE Reservoir Simulation Symposium, Houston, TX, February (2003).
[12] Nghiem L.X., Fong D.K., Aziz K., Compositional Modelling with an Equation of State, SPE Journal, (Dec.1981), p. 687 (1981).