Improving the SAGD Performance by Introducing a New Well Configuration
- Mohamad Mojarab (University of Calgary) | Thomas G. Harding (University of Calgary) | Brij B. Maini (University of Calgary)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- April 2011
- Document Type
- Journal Paper
- 9 - 18
- 2011. Society of Petroleum Engineers
- 5.3.9 Steam Assisted Gravity Drainage, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.5 Reservoir Simulation
- SAGD, well configuration
- 1 in the last 30 days
- 895 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
Steam-assisted gravity drainage (SAGD) is a commercially successful recovery process that produces heavy oils and bitumen. The method ensures both a stable displacement front of steam and economical rates by using gravity as the driving force with a pair of horizontal wells for injection/production. Although several ways of improving the performance have been discussed in the literature, the well configuration employed in the process has remained the same as originally proposed by Butler et al. (1981). A systematic attempt to improve the performance by using radically different well configurations has not been reported.
This paper presents a study intended to examine the applicability of a new well configuration to SAGD processes in Athabasca and Cold Lake reservoirs in central and northern Alberta. The fully implicit thermal-reservoir simulator, CMG's STARS 2007, with fully coupled wellbores was used to account for frictional pressure drop and heat losses along the wellbore. 3D numerical simulation models were set up, and sensitivity analyses were conducted on injection pressure. After optimization of the injection pressure, an investigation of new well configurations was conducted using these models. The result of this work shows that the SAGD-process performance in Athabasca and Cold Lake reservoirs can be improved significantly by changing the well configuration.
|File Size||820 KB||Number of Pages||10|
Butler, R.M., McNab, G.S., and Lo, H.Y. 1981. Theoretical studies on thegravity drainage of heavy oil during in situ steam heating. Canadian Journalof Chemical Engineering (CJChE) 59 (4): 455-460.
Chan, M.Y.S., Fong, J., and Leshchyshyn, T. 1997. Effects of Well Placementand Critical Operating Conditions on the Performance of Dual Well SAGD WellPair in Heavy Oil Reservoir. Paper SPE 39082 presented at the Latin Americanand Caribbean Petroleum Engineering Conference, Rio de Janeiro, 30 August-3September. doi:10.2118/39082-MS.
Chung, K.H. and Butler, R.M. 1988. Geometrical Effect of Steam Injection onthe Formation of Emulsion in the Steam Assisted Gravity Drainage Process. JCan Pet Technol 27 (1):36-42. JCPT Paper No. 88-01-02. doi: 10.2118/88-01-02.
Ehlig-Economides, C.E., Fernandez, B., and Economides, M.J. 2001.Multibranch Injector/Producer Wells in Thick Heavy-Crude Reservoirs. SPE ResEval & Eng 4 (3): 195-200. SPE-71868-PA. doi: 10.2118/71868-PA.
Gates, I.D., Adams, J.J., and Larter, S.R. 2008. The Impact of Oil ViscosityHeterogeneity on the Production Characteristics of Tar Sand and Heavy OilReservoirs. Part II: Intelligent, Geotailored Recovery Processes inCompositionally Graded Reservoirs. J Can Pet Technol 47(9): 40-49. JCPT Paper No. 08-09-40. doi: 10.2118/08-09-40.
Gates, I.D., Kenny, J., Hernandez-Hdez, I.L., and Bunio, G.L. 2007.Steam-Injection Strategy and Energetics of Steam-Assisted Gravity Drainage.SPE Res Eval & Eng 10 (1): 19-34. SPE-97742-PA. doi: 10.2118/97742-PA.
Joshi, S.D. and Threlkeld, C.B. 1985. Laboratory studies of thermally aidedgravity drainage using horizontal wells. AOSTRA J. Research 2 (1): 11-19.
Liebe, H.R. and Butler, R. 1991. A Study of the Use of Vertical SteamInjection in the Steam Assisted Gravity Drainage Process. Presented at theCIM/AOSTRA 1991 Technical Conference, Banff, Alberta, Canada, 21-24 April.
Mehrotra, A.K. and Svrcek, W.Y. 1986. Viscosity of compressed Athabascabitumen. The Canadian Journal of Chemical Engineering 64(5): 844-847. doi:10.1002/cjce.5450640520.
Mojarab, M. 2009. Improving SAGD Performance by Modifying the WellConfiguration. MSc thesis, University of Calgary, Calgary, Alberta (May2009).
Oballa, V., Coombe, D.A., and Buchanan, L. 1997. Aspects of DiscretizedWellbore Modeling Coupled to Compositional/Thermal Simulation. J Can PetTechnol 36 (4): 45-51.
Sasaki, K., Akibayashi, S., Yazawa, N., Doan, Q., and Farouq Ali, S.M. 1999.Experimental Modelling of the SAGD Process 3/4 Enhancing SAGD Performance withPeriodic Stimulation of the Horizontal Producer. Paper SPE 56544 presented atthe SPE Annual Technical Conference and Exhibition, Houston, 3-6 October. doi: 10.2118/56544-MS.
Stalder, J.L. 2007. Cross SAGD (XSAGD)--An Accelerated Bitumen RecoveryAlternative. SPE Res Eval & Eng 10 (1): 12-18.SPE-97647-PA. doi:10.2118/97647-PA.
Vanegas Prada, J.W., Cunha, L.B., and Alhanati, F.J.S. 2005. Impact ofOperational Parameters and Reservoir Variables During the Startup Phase of aSAGD Process. Paper SPE 97918 presented at the SPE/PS-CIM/CHOA InternationalThermal Operations and Heavy Oil Symposium, Calgary, 1-3 November. doi: 10.2118/97918-MS.
Vincent, K.D., MacKinnon, C.J., and Palmgren, C.T.S. 2004. Developing SAGDOperating Strategy using a Coupled Wellbore Thermal Reservoir Simulator. PaperSPE 86970 presented at the SPE International Thermal Operations and Heavy OilSymposium and Western Regional Meeing, Bakersfield, California, USA, 16-18March. doi:10.2118/86970-MS.