Feasibility of In-Situ Combustion in the SAGD Chamber
- Seyed Javad Paitakhti Oskouei (University of Calgary) | R. Gordon Moore (University of Calgary) | Brij B. Maini (University of Calgary) | Sudarshan A. Mehta (University of Calgary)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- April 2011
- Document Type
- Journal Paper
- 31 - 44
- 2011. Society of Petroleum Engineers
- 2.4.3 Sand/Solids Control, 5.8.5 Oil Sand, Oil Shale, Bitumen, 5.3.9 Steam Assisted Gravity Drainage, 5.4 Enhanced Recovery
- ISC, Mature SAGD, SAGD
- 3 in the last 30 days
- 806 since 2007
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Steam-assisted gravity drainage (SAGD) is a commercially successful bitumen-recovery method that has transformed some of the vast Canadian oil-sand deposits into recoverable reserves. Several SAGD projects have been developed in northern Alberta in the past few years, and many more are in the planning stages. As the projects mature, new operational problems are revealed, demanding new solutions. Because of operational restrictions, it is almost impossible to have the same growth rate in all steam chambers in a SAGD pattern. Hence, interference between a mature chamber and an adjoining immature chamber can become a problem. Steam leakage from the immature chamber into the mature chamber reduces the thermal efficiency of the project and requires a solution to prevent the steam dissipation.
Filling the mature chamber with combustion gases is a possible solution for this problem. Carrying out in-situ combustion (ISC) in the mature chamber not only would create the needed combustion gases in the chamber, but also could recover a substantial part of the residual oil in the mature chamber. It is also likely that the combustion would create a reduced-permeability coke (toluene insoluble fraction) zone around the mature chamber, thus isolating it from the rest of the reservoir.
To evaluate the merit of this idea, an elevated-pressure experiment was conducted using a 2D physical model. The conventional SAGD process was conducted in the model to develop a steam chamber. Air was then injected through a horizontal well near the top of the model into the SAGD chamber, and a combustion front was established around the air-injection well. By operating combustion in the depleted chamber, residual oil was mobilized and produced. Additional oil recovery was attained by more than 20% over the SAGD operation as a bonus. Initiation and propagation of combustion were confirmed by a large increase in the temperature in the combustion zone. After unpacking the model, it was found that a coke layer formed around the perimeter of the chamber.
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Bagci, A.S., Olushola, S., and Mackay, E. 2008. Performance Analysis of SAGDWind-Down Process with CO2 Injection. Paper SPE 113234 presented at the SPE/DOESymposium on Improved Oil Recovery, Tulsa, 20-23 April. doi: 10.2118/113234-MS.
Belgrave, J.D.M., Nzekwu, B., and Chhina, H.S. 2007. SAGD Optimization withAir Injection. Paper SPE 106901 presented at the Latin American & CaribbeanPetroleum Engineering Conference, Buenos Aires, 15-18 April. doi: 10.2118/106901-MS.
Good, W.K., Luhning, R.W., and Kisman, K.E. 2006. Process for sequentiallyapplying SAGD to adjacent sections of a petroleum reservoir. US PatentNo.7,090,014.
Kisman, K.E. 1993. Process for Confining Steam Injected into a Heavy OilReservoir. Canadian Patent No. CA2015460.
Komery, D.P., Luhning, R.W., Pearce, J.V., and Good, W.K. 1998. PilotTesting of Post-Steam Bitumen Recovery from Mature SAGD Wells in Canada. PaperNo. 1998.214 presented at the 7th UNITAR International Conference, Beijing,27-31 October.
Law, D.H.-S. 2004. Disposal of Carbon Dioxide, a Greenhouse Gas, forPressure Maintenance in a Steam Based Thermal Process for Recovery of Heavy Oiland Bitumen. Paper SPE 86958 presented at the SPE International ThermalOperations and Heavy Oil Symposium and Western Regional Meeting, Bakersfield,California, USA, 16-18 March. doi:10.2118/86958-MS.
Moore, R.G., Belgrave, J.D.M., Ursenbach, M.G., Laureshen, C.J., Mehta,S.A., Gomez, P.A., and Jha, K.N. 1999. In Situ Combustion Performance in SteamFlooded Heavy Oil Cores. J Can Pet Technol 38 (13).
Oskouei, S.J, Moore, R.G., Maini, B., and Mehta, S.A. 2011. FrontSelf-Correction for In-Situ Combustion. J Can Pet Technol 50 (3): 43-56. SPE-137841-PA. doi: 10.2118/137841-PA.
Yee, C.T. and Stroich, A. 2004. Flue Gas Injection into a Mature SteamChamber at the Dover Project (Formerly UTF). J Can Pet Technol 43 (1). JCPT No. 04-01-06. doi: 10.2118/04-01-06.