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SPE 092

Subsurface Characterization of the Edmonton-Area Acid-Gas Injection Operations

Acid gas dissolved in water in the Redwater oil field, and the resulting weak acidic solution ("sour" water) is injected into the depleted Leduc Formation Redwater reef trough 47 alternating wells. If only the natural setting is considered, ... Show Abstract

Bachu, S.  Buschkuehle, B.E.  Haug, K.  Michael, K.  2008-04-14

SPE 090

Subsurface Characterization of Acid-Gas Injection Operations in the Peace River Arch Area, 2007

Abstract: Injection of acid gas in the Peace River Arch area occurs at 11 operations in 3 major stratigraphic units, the Upper Devonian Leduc Formation and Wabamun Group, the Permo-Mississippian Belloy and Kiskatinaw formations, and the Triassic Halfway Formation. By the end of 2006, approximately 340 million cubic metres of acid gas were injected into deep geological formations in the Peace River Arch area. At Dunvegan, Eaglesham, Gordondale (Halfway), Mirage, Normandville, Parkland and Puskwaskua injection occurs or took place into depleted hydrocarbon reservoirs. By regulation, downhole pressures will not exceed the respective initial reservoir pressures, and the injected gas will remain within the respective pool outlines. At Mirage and Gordondale-Halfway, acid gas was injected into currently producing Halfway reservoirs, which will be partly recycled in the injection/production cycle. In the cases of acid-gas injection into deep saline aquifers (Gordondale-Belloy, Mulligan, Pouce Coupe, Rycroft and Wembley), the extent and migration of the acid-gas plume will likely be limited by dissolution, dispersion, residual gas saturation and trapping along the migration pathway and, therefore, not reach the overlying aquifers.The entire stratigraphic interval from the Leduc Formation to the Halfway Formation is overlain by at least one contiguous thick shale sequence, the Smoky Group. Other aquitards (i.e., Wilrich, Fernie, Charlie Lake, Montney, Banff-Exshaw) form additional barriers to acid-gas migration from the various injection zones into other strata and the flow process, if it will ever happen, would take an extremely long time, on a geological time scale. Any acid gas plume would disperse and dissolve in formation water during flow on such large time and spatial scales.Tectonics greatly affected the sedimentary framework, particularly the Paleozoic succession, in the Peace River Arch area. The main tectonic activity occurred during the late Carboniferous, resulting in thick Mississippian to Permian sediment accumulation in the area of the Dawson Creek Graben Complex. Under the present-day stress regime, faults that are present in the various local-scale study areas do not appear to act as fluid conduits through aquitards overlying the respective injection horizons. However, the displacement of strata along faults that are present near injection wells results in a partial lateral confinement of acid-gas within injection intervals. Based on available data, it seems there is no potential for acid gas leakage through faults and fractures. However, the possibility for upward leakage of acid gas exists along wells that were improperly completed and/or abandoned, or along wells whose cement and/or tubing has degraded, or may degrade in the future, as a result of chemical reactions with formation brine and/or acid gas. The Peace River Arch area has a high well density and the wells penetrate hydrocarbon-bearing strata down to the Granite Wash overlying the Precambrian basement. Wells in the Peace River Arch area were drilled, and successively abandoned, as early as the late 1950s and, considering the old age, damage to or improper well completion is very likely in some cases. No leakage has been detected and reported to date; however, the potential for this occurring in the future should be considered by both operators and regulatory agencies. Place Keywords 83m 83n 84c 84d alberta canada peace river area Theme Keywords acid gas fault geology hydrogeology injection peace river arch

Michael, K.  Buschkuehle, B.E.  2008-03-01

SPE 093

Subsurface Characterization of the Pembina-Wabamun Acid-Gas Injection Area

Subsurface Characterization of the Pembina-Wabamun Acid-Gas Injection Area If only the natural setting is considered, including geology and flow of formation waters, the basin to local-scale hydrogeological analysis indicates that injecting acid ... Show Abstract

Bachu, S.  Buschkuehle, B.E.  Haug, K.  Michael, K.  2008-04-14

SPE 091

Subsurface Characterization of Acid Gas Injection Operations in the Provost Area

By the end of 2004, approximately 350 kt of acid gas had been injected into deep geological formations in the Provost area.If only the natural setting is considered, including geology and flow of formation waters, the basin and local-scale ... Show Abstract

Michael, K.  Buschkuehle, B.E.  2008-03-01

SPE 095

Subsurface Characterization of the Brazeau Nisku Q Pool Reservoir for Acid Gas Injection

The experience gained since the start of the first acid-gas injection operation in Canada in 1989 shows that, from an engineering point of view, acid-gas disposal is a well-established technology. The operator has met all the current requirements ... Show Abstract

Bachu, S.  Buschkuehle, B.E.  Michael, K.  2008-04-14

GEO 2002-14

Sedimentology and Stratigraphy of Middle and Upper Devonian Carbonates in Northern Alberta: A Contribution to the Carbonate-Hosted Pb-Zn (MVT) Targeted Geoscience Initiative

Sedimentology and Stratigraphy of Middle and Upper Devonian Carbonates in Northern Alberta: A Contribution to the Carbonate-Hosted Pb-Zn (MVT) Targeted Geoscience Initiative Outcrops of Middle and Upper Devonian carbonates in northern Alberta were ... Show Abstract

Buschkuehle, B.E.  2003-07-01

ESR 2006-05

Subsurface Characterization of Acid-Gas Injection Operations in Northeastern British Columbia

Subsurface Characterization of Acid-Gas Injection Operations in Northeastern British Columbia Acid gas mixed with water is injected into the Permo-Carboniferous aquifer at Ring. At Caribou, the only injection site within the deformed part of the ... Show Abstract

Buschkuehle, B.E.  Michael, K.  2006-12-01