A History Match of the 1993 ESAGD Pilot Performance in the Peace River Reservoir
The Peace River Oil Sands deposit is one of the major oil sands accumulations in Alberta. Shell discovered this deposit while drilling for conventional oil in 1951. Since that time the Peace River deposit has been the target for many thermal recovery field trials. This paper discusses the two well pair Enhanced Steam Assisted Gravity Drainage (ESAGD) field trial initiated in 1993. The term ESAGD describes a process that starts out as a conventional SAGD (Steam Assisted Gravity Drainage) process and once the steam chambers are fully developed, a pressure differential between the established chambers adds an incremental steam drive component to the overall process. The ESAGD field trial operated from November 1993 through to 2001 with generally disappointing results. The ESAGD planning simulations had predicted a cumulative average bitumen production rate of 80m3/d per well pair and the actual average calendar day bitumen rate was 22.5m3/d The final oil to steam ratio (OSR) was O.1, compared with the expected 0.35, with a final estimated recovery efficiency of 10％. The simulated history match is adequately representative of the performance during the early SAGD phase; however there is a deviation in the prediction following the application of the pressure differential between the two well pairs, during the ESAGD. The results from the simulation sensitivity studies indicated that the well performance is highly dependent on the presence and extent of the high water saturation zone and on the petrophysical properties assigned within the model for absolute horizontal and vertical permeability. The simulated history match and the temperature observation wells indicated that most of the pilot bitumen production came from the highly permeable bottom zone of the reservoir, where water saturations are also high. Furthermore the steam zone did not rise much above this basal zone, limited by the vertical permeability of the reservoir. The fact that the steam chambers did not fully develop implies that the ESAGD process in this pilot was not adequately tested.
M. DING L. WHALE
Shell Canada Limited
国际会议
首届世界重油大会(The Technical Sessions of the First World Heavy Oil Conference)
北京
英文
90-97
2006-11-12（万方平台首次上网日期，不代表论文的发表时间）