Impact of Different SAGD Well Configurations (Dover SAGD Phase B Case Study)
- Mohamed R. Tamer (Harvest Operations Corporation) | Ian D. Gates (University of Calgary)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- January 2012
- Document Type
- Journal Paper
- 32 - 45
- 2012. Society of Petroleum Engineers
- 5.3.9 Steam Assisted Gravity Drainage, 5.1.5 Geologic Modeling, 5.8.5 Oil Sand, Oil Shale, Bitumen, 5.4.6 Thermal Methods, 4.3.4 Scale
- well configuration, SAGD
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The volume of heavy oil and bitumen in the oil-sands deposits in western Canada is similar to that of conventional crude oil in the Middle East. This resource is immense but is difficult and energy intensive to extract because the viscosity of the oil is high, typically greater than 100,000 to 1,000,000+ cp at original reservoir conditions. Current commercial thermal-recovery processes used include steam-assisted gravity drainage (SAGD) and cyclic steam stimulation (CSS). These methods are energy intensive, emit significant amounts of CO2 into the atmosphere, and use large volumes of water to recover the oil. In this work, the focus is on SAGD processes. It has been demonstrated that operating strategy can be altered to improve SAGD performance, but it is not clear how well configuration can be changed to improve recovery, energy intensity, thermal efficiency, water use, and flue-gas emissions. This paper examines the impact of position and geometry of steam injectors on the performance of steam-based gravity-drainage processes in a heterogeneous reservoir. Different injection-well configurations including single horizontal (typical SAGD), offset SAGD, and vertical/horizontal well combinations have been evaluated by using a detailed, 3D, geostatistically populated, large-scale thermal reservoir-simulation model derived from core-data examinations of the Dover pilot site. The research reveals how injection-well configuration impacts energy delivery to the reservoir, how it affects thermal efficiency, and how it changes the evolution of the steam-conformance zone and oil-flow dynamics in the reservoir. The results suggest that several vertical injectors have the potential to deliver steam more efficiently than a single horizontal injector.
|File Size||7 MB||Number of Pages||14|
Burrowes, A., Marsh, R., Ramdin, N., and Evans, C. 2008. Alberta's EnergyReserves 2006 and Supply/Demand Outlook 2008-2017. Annual Report ST98-2008,Energy Resources Conservation Board, Calgary, Alberta (June 2008).
Butler, R.M. 1982. Method for continuously producing viscous hydrocarbons bygravity drainage while injecting heated fluids. US Patent No. 4,344,485.
Butler, R.M. 1994. Steam-assisted Gravity Drainage: Concept, Development,Performance And Future. J Can Pet Technol 33 (2): 44-50.JCPT Paper No. 94-02-05. http://dx.doi.org/10.2118/94-02-05.
Butler, R.M. 1997. Thermal Recovery of Oil and Bitumen. Calgary,Alberta: GravDrain Inc.
Butler, R.M. 2001. Some Recent Developments in SAGD. J Can PetTechnol 40 (1): 18-22. JCPT Paper No. 01-01-DAS. http://dx.doi.org/10.2118/01-01-DAS.
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. http://dx.doi.org/10.2118/39082-MS.
Chung, K.H. and Butler, R.M. 1989. A Theoritical and Experimental Study ofthe Steam-Assisted Gravity Drainage Process. Proc., 4th UNITARConference on Heavy Crude and Tar Sands, Edmonton, Alberta, 7-12 August,191-210.
CMG. 2007. STARS User Manual, Version 2007.10. Calgary, Alberta: ComputerModelling Group.
Edmunds, N. and Chhina, H. 2001. Economic Optimum Operating Pressure forSAGD Projects in Alberta. J Can Pet Technol 40 (12): 13-17.Paper No. 01-12-DAS. http://dx.doi.org/10.2118/01-12-DAS.
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. http://dx.doi.org/10.2118/71868-PA.
Falk, K., Nzekwu, B., Karpuk, B., and Pelensky, P. 1996. A Review ofInsulated Concentric Coiled Tubing Installations for Single Well, SteamAssisted Gravity Drainage. Paper SPE 36333 presented at the SPE/ICoTA NorthAmerican Coiled Tubing Roundtable, Montgomery, Texas, USA, 26-28 February. http://dx.doi.org/10.2118/36333-MS.
Gates, I.D. and Chakrabarty, N. 2006. Optimization of Steam Assisted GravityDrainage in McMurray Reservoir. J Can Pet Technol 45 (9):54-62. JCPT Paper No. 06-09-05. http://dx.doi.org/10.2118/06-09-05.
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. http://dx.doi.org/10.2118/08-09-40.
Joshi, S.D. 1986. A Laboratory Study of Thermal Oil Recovery UsingHorizontal Wells. Paper SPE 14916 presented at the SPE Enhanced Oil RecoverySymposium, Tulsa, 20-23 April. http://dx.doi.org/10.2118/14916-MS.
Luft, H.B., Pelensky, P.J., and George, G.E. 1995. Development and Operationof a New Insulated Concentric Coiled Tubing String for Continuous SteamInjection in Heavy Oil Production. Paper SPE 30322 presented at the SPEInternational Heavy Oil Symposium, Calgary, 19-21 June. http://dx.doi.org/10.2118/30322-MS.
Polikar, M., Cyr, T.J., and Coates, R.M. 2000. Fast-SAGD: Half the Wells and30% Less Steam. Paper SPE 65509 presented at the SPE/CIM InternationalConference on Horizontal Well Technology, Calgary, 6-8 November. http://dx.doi.org/10.2118/65509-MS.
Rottenfusser, B.A., Palfreyman, J.E., and Alwast, N.K. 1988. Geology of theAOSTRA Underground Test Facility Site. Paper presented at the 4th UNITAR/UNDPConference on Heavy Crude and Tar Sands, Edmonton, Alberta, Canada, 7-12August.
Stalder, J.L. 2007. Cross SAGD (XSAGD)--An Accelerated Bitumen RecoveryAlternative. SPE Res Eval & Eng 10 (1): 12-18.SPE-97647-PA. http://dx.doi.org/10.2118/97647-PA.
Strobl, R., Attalla, M., Cotterill, D., Yuan, L.P., and Stevens, J. 1995.Application of an Outcrop Analoque to Reservoir Characterization, McMurrayFormation, Northeastern Alberta. Paper presented at the 6th UNITARInternational Conference on Heavy Crude and Tar Sands, Houston, 12-17February.
Tamer, M. 2008. Impact of Well Configuration on Performance ofSteam-based Gravity Drainage Recovery Processes. MSc thesis, Department ofChemical and Petroleum Engineering, University of Calgary, Calgary,Alberta.
Wightman, D., Rottenfusser, B., Kramers, J., and Harrison, R. 1989. Geologyof Alberta Oil Sands Deposits. In AOSTRA Technical Handbook on Oil Sands,Bitumens and Heavy Oils, ed. L.E. Hepler and H. Chu, No 6. Edmonton,Alberta: Technical Publications Series, AOSTRA.