Enhanced Gas Recovery with Carbon Dioxide Sequestration in a Water-drive Gas Condensate Reservoir: a Case Study in a Real Gas Field


1 Research Institute of Petroleum Industry

2 Tehran Energy Consultant Company


Gas reservoirs usually have high recovery due to high mobility and low residual gas saturation, although some of them producing under water-drive mechanism have low recovery efficiency. Encroachment of water into these reservoirs traps considerable amount of gas and increases the maximum residual gas saturation, which results in the reduction of gas and condensate production. Generally, the recoveries of water-drive gas reservoirs vary between 35-75%, whereas depletion-drive reservoirs exhibit recoveries near 85%. In this work, a method was proposed for reducing water encroachment, sweeping reservoir gas content effectively, and enhancing the hydrocarbon recovery consequently. To this end, a condensate gas reservoir model, located in the south of Iran, was chosen to study the process. The injection was performed above the bottom-up aquifer from two horizontal wells, and the base gas was produced by four vertical wells. Three cases of inactive aquifer (Case I), active aquifer (Case II), and active aquifer with CO2 injection (Case III) were studied subsequently. The proposed gas-gas displacement method increases the recovery of reservoir especially the recovery of heavier components composing the main part of the condensate. Moreover, the injection of a huge volume of CO2 without significant CO2 production can be interesting from an environmental point of view and can be considered as a CO2 sequestration process.


Lee W. J. and Wattenbarger R. A., “Gas Reservoir Engineering,” SPE Textbook Series, 1996.

Turta A. T., Sim S. S. K., Singhal A. K., and Hawkins B. F., “Basic Investigations on Enhanced Gas Recovery by Gas-Gas Displacement,” Journal of Canadian Petroleum Technology, 2008, 47(10), 39-44.

Mckay B. A., “Laboratory Studies of Gas Displacement from Sandstone Reservoirs Having a Strong Water Drive,” APEA Journal, 1974, 189-194.

Bassiouniz Z., “Enhanced Recovery from Water-Drive Gas Reservoirs,” Rudarsko-Geolosko-Naftni Zbornik, 1990, 2, 151-159.

Holtz M., “Residual Gas Saturation to an Influx: A Calculation Method for 3-D Computer Reservoir Model Construction,” SPE 75502, 2002.

Batycky J., Irwin D., and Fish R., “Trapped Gas Saturation in Leducage Reservoirs,” Journal of Canadian Petroleum Technology, 1998, 37(2), 32-39.

Chesney T. P., Lewis R. C., and Trice M. L., “Secondary Gas Recovery from a Moderately Strong Water-Drive Reservoir: A Case History,” JPT, 1982, 34(9), 2149-2157.

Ali F., “Importance of Water Influx and Waterflooding in Gas Condensate Reservoir. Department of Petroleum Engineering and Applied Geophysics,” Norwegian University of Science and Technology (NTNU), 2014, 9.

Sim S. S. K., Brunelle P., Turta A. T., and Singhal A. K., “Enhanced Gas Recovery and CO2 Sequestration by Injection of Exhaust Gases from Combustion of Bitumen,” SPE 113468, 2008.

Al-Hashami A., Ren S. R., and Tohidi B., “CO2 Injection for Enhanced Gas Recovery and Geo-Storage: Reservoir Simulation and Economics,” SPE 94129, 2005.

Blyton C. A. J., “Kinetic of CO2 Dissolution in Brine: Experimental Measurement and Application to Geologic Storage,” The University of Texas at Austin, 2012, 18-22.

Cakici M.D., “Co-optimization of Oil Recovery and Carbon Dioxide Storage,” M. Sc. Thesis, Stanford University, 2003, 1-2.

Faiz M. M., Saghafi A., Barclay S. A., Sherwood L. S. N. R., and Whitford D. J., Evaluating Geological Sequestration of CO2 in Bituminous Coals: The Southern Sydney Basin, Australia as a Natural Analogue,” International Journal of Green-house Gas Control, 2007, 1, 223-235.

Jikich S. A., Smith D. H., Sams W. N., and Bromhal G. S., “Enhanced Gas Recovery (EGR) with Carbon Dioxide Sequestration: A Simulation Study of Effects of Injection Strategy and Operational Parameters,” SPE 84813., 2003.

Oldenburg C. M., “Carbon Sequestration in Natural Gas Reservoirs: Enhanced Gas Recovery and Natural Gas Storage Proceeding,” Tough Symposium, California, 2003.

Forest T., “CO2 Enhanced Oil Recovery in Strong Water-Drive Reservoirs. Department of Petroleum Engineering and Applied Geophysics,” Norwegian University of Science and Technology (NTNU), 2012.

Sim S. S. K., Turta A. T., Singhal A. K., Hawkins B. F., and Council A. R., “Enhanced Gas Recovery: Factors Affecting Gas-Gas Displacement Efficiency,” Journal of Canadian Petroleum Technology, 2009, 48(8), 49-55.

Kühn M., Förster A., Grobmann J., Meyer R., et al., “CLEAN: Preparing for a CO2-based Enhanced Gas Recovery in a Depleted Gas Field in Germany,” Energy Procedia, 2011, 4, 5520-5526.

Secklehner S., Arzmüller G., and Clemens T., “Tight Ultra-deep Gas Field Production Optimization – Development Optimization and CO2 Enhanced Gas Recovery Potential of the Schoenkirchen Uebertief Gas Field,” Austria. SPE 130154, 2010.

Wei X. R., Wang G. X., Massarotto P., Golding S. D., et al., “Numerical Simulation of Multicomponent Gas Diffusion and Flow in Coals for CO2 Enhanced Coalbed Methane Recovery,” Chemical Engineering Science, 2007, 62, 4193–4203.

Zangeneh H., Jamshidi S. and Soltanieh M., “Coupled Optimization of Enhanced Gas Recovery and Carbon Dioxide Sequestration in Natural Gas Reservoirs: Case Study in a Real Gas Field in the South of Iran,” International Journal of Greenhouse Gas Control, 2013, 17, 515-522.

Zangeneh H., Safarzadeh M. A., and Asgari A. A., “Carbon Dioxide Injection to Control Water Encroachment in Water-Drive Gas Condensate Reservoirs. TP4-23,” International Gas Union (IGU) Conference, Denmark, 2014.

Ahmed T., “Handbook of Reservoir Engineering,” Gulf Professional Publishing, Texas, 2000, 292-293.

Mesdour R., Ramsey L., and Aly A., “Optimizing Development Well Placements within Geological Uncertainty Utilizing Sector Model,” SPE 12847, 2010.

Montgomery D. C., “Design and Analysis of Experiments,” Fifth Edition, John Wiley & Sons Inc, 2001, 303-347.