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Investigating the Stress Path in a CO2 Storage Reservoir Using Couple Geomechanical and Multiphase Flow Modelling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Second EAGE Workshop on Geomechanics and Energy, Oct 2015, cp-466-00021
- ISBN: 978-94-6282-161-3
Abstract
The potential for stress path hysteresis in depleted and re-pressurized reservoirs and an accompanying reduction of the fracture pressure for CO2 injection presents a risk for CCS projects, both for reduction of injection capacity due to pressure limits and the risk of leakage from the reservoir. Coupled geomechanical fluid flow modelling has been carried out to investigate field observations of the post-depletion reduction of fracture pressure during water injection in a North Sea oil field. The modelling demonstrates that stress path hysteresis and fracture pressure reduction can occur in plastically deforming reservoirs at a similar level to that observed in the field. Continued modelling work is focussing on investigating the additional impact of reservoir geometry, geomechanical temperature effects and material properties on the fracture pressure.