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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 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 095

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

Abstract: 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. Close to 1.5 Mt CO2 and 1 Mt H2S have been successfully injected into deep hydrocarbon reservoirs and saline aquifers in Alberta and British Columbia. A major issue that has not been addressed is the containment and long-term fate of the injected acid gas. Although no incidents of long-range migration or leakage have been detected and reported to date, both operators and regulatory agencies should consider this issue.The Alberta Energy and Utilities Board recently approved injection of acid gas into the Nisku Q Pool in the Pembina-Brazeau area in Alberta. The operator has met all the current requirements for obtaining regulatory approval; however, the application does not contain a comprehensive hydrogeological analysis because currently it is not required.If only the natural setting is considered, including geology and flow of formation waters, the basin to site-scale hydrogeological analysis indicates that injecting acid gas into the Nisku Q Pool is basically a safe operation with no potential for acid-gas migration to shallower strata, potable groundwater and the surface. There are many physical and hydrodynamic barriers to acid-gas migration from the injection formation 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.Based on available data, it seems there is no potential for acid-gas leakage through 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 have degraded or may degrade in the future as a result of chemical reactions with formation brine and/or acid gas. Place Keywords 83b 83c 83f 83g alberta brazeau canada Theme Keywords acid gas co2 geology hydrogeology injection lithology stratigraphy

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

ESR 2000-11

Suitability of the Alberta Subsurface for Carbon Dioxide Sequestration in Geological Media

Sequestration of anthropogenic CO2 in geological media is a potential solution to the release into the atmosphere of CO2, a greenhouse gas. Basically, there are five ways of sequestering CO2 in geological media: 1) through enhanced oil recovery ... Show Abstract

Bachu, S.  Brulotte, M.  Grobe, M.  Stewart, S.A.  2000-03-01

SPE 094

Stress Regime at Acid-Gas Injection Operations in Western Canada

Regulatory agencies in Western Canada impose safe limits on the injection pressure to maintain the pressure around the injection well below the fracturing threshold of the rocks. An evaluation of the stress regime at the acid-gas injection sites in ... Show Abstract

Bachu, S.  Haug, K.  Michael, K.  2008-04-14

BUL 060

Evaluation of effects of deep waste injection in the Cold Lake area, Alberta

The regional and local effects of underground injection of wastewater from in situ oil sands pilot plants have been evaluated at sites in the Cold Lake area, Alberta, using projected injection rates up to the year 2015. Geochemical effects were ... Show Abstract

Bachu, S.  Perkins, E.H.  Hitchon, B.  Lytviak, A.T.  Underschultz, J.R.  1989-01-01

BUL 058

Hydrogeology of the Swan Hills Area, Alberta: Evaluation for deep waste injection

A detailed hydrogeological study was carried out in a region defined as Tp 62-74 R 1-13 W5M, comprising 15 760 square km effectively centered on the Special Waste Injection Site of the Alberta Special Waste Management Corporation. The objective was ... Show Abstract

Hitchon, B.  Sauveplane, C.M.  Bachu, S.  Koster, E.H.  Lytviak, A.T.  1989-01-01

BUL 059

Hydrogeological and geothermal regimes in the Phanerozoic succession, Cold Lake area, Alberta and Saskatchewan

The natural, steady-state fluid flow and geothermal regimes were determined for a region defined as Tp 50-70, R 15 W3M to R 17 W4M (60 000 km2), including the Cold Lake Oil Sand Deposit and adjacent heavy oil areas to the south. Data processing was ... Show Abstract

Hitchon, B.  Bachu, S.  Sauveplane, C.M.  Ing, A.  Lytviak, A.T.  1989-01-01

BUL 061

Regional-Scale Subsurface Hydrogeology in Northeast Alberta

The hydrogeological regime of formation waters in the Phanerozoic sedimentary succession was determined for a region defined as Tp 70-103 W4 Mer (55-58 degrees;N latitude and 110-114 degrees;W longitude) in northeast Alberta, covering most of the ... Show Abstract

Bachu, S.  Underschultz, J.R.  Hitchon, B.  Cotterill, D.K.  1993-01-01

BUL 062

Industrial Mineral Potential of Alberta Formation Waters

Nearly 130 000 analyses of formation waters from Alberta and adjacent areas were searched for contents of Ca, Mg, K, Br, I and Li exceeding specified regional exploration thresholds. The 5280 analyses meeting these criteria comprise the formation ... Show Abstract

Hitchon, B.  Bachu, S.  Underschultz, J.R.  Yuan, L.P.  1995-01-01