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Assessing the Potential for CO2-EOR and CO2 Storage in Depleted Oil Pools in Southeastern Saskatchewan, Canada


Assessing the Potential for CO2 EOR and CO2 Storage in Depleted Oil Pools in Southeastern Saskatchewan, Canada

This study set out to identify the potential for CO2 Enhanced Oil recovery (EOR) and subsequent CO2 storage in depleted oil fields in the province of Saskatchewan. It investigates the feasibility of which pools have the greatest potential for increased hydrocarbon production via the injection of CO2, and in turn storage of the injected CO2 in the depleted oil reservoirs as a means to reduce greenhouse gas emissions. Saskatchewan is host to numerous oil and gas pools throughout the Phanerozoic strata with some pools producing since the 1950’s. Such depleted pools are ideal candidates for CO2 EOR as the pools have undergone infill drilling, water flooding and possibly horizontal drilling; tertiary production would be the next phase of production. The Weyburn and Midale fields are prime examples of this technology as both fields have been under CO2 EOR flood since 2000, and are currently producing 14 000 barrels of oil per day of which 9 000 are incremental production as a result of the CO2 injection. It is excepted that over the life of the Weyburn CO2 EOR project that 155 million barrels of oil are to be produced.

A filtering method was employed for determining which oil pools would be the best candidates for CO2 EOR. The filtering criteria included original oil in place, oil density, production depth, current recovery factor and current oil saturation. The resultant list of 20 pools that meet the filtering requirements will be discussed, as well as volume calculations for the potential oil volume that could be produced and potential CO2

volume that could be stored in the top five pools. This study could act as the first step for oil companies on deciding which pools are the best candidates for CO2 EOR.