CO2 EOR and Sequestration for a Western Canadian Tight Oil Reservoir

Project Summary

Subsurface Dynamics was tasked with assessing the feasibility of multiple EOR schemes (Waterflood, CO2 flood, and Water Alternating Gas - WAG) for a hydraulically fractured tight-oil reservoir in Western Canada.

Scope of Work

Using geological models provided by the client, Subsurface Dynamics reviewed and prepared the static model for simulation. A PVT model was calibrated using lab data and comprehensive history-matching was performed on 16 hydraulically-fractured wells using a black oil simulator. The history-matched model was then upgraded to a compositional model for final tuning before EOR optimizations were performed under Waterflood, CO2 flood, and WAG.

Result

• Quality history-match achieved with historical oil, gas, and pressure data.

• 10-component PVT model constructed and tuned to lab data for use with the compositional simulator.

• All 3 EOR schemes were shown to notably improve oil recovery within the model: 116% with waterflood, 125% with WAG, and 205% with CO2.

• Injectant impurities, including oxygen and argon, were shown to reduce the efficacy of the CO2 flooding scheme.