1887

Abstract

Summary

In this contribution we evaluate the theoretical storage capacities of CO2, H2 and NH3 of the Frigg Field (North Sea, Norway) as an example for re-use of shut down O&G fields. Large quantities of these fluids can be theoretically stored in the depleted field. However, historical hydrocarbon regions are extensively drilled by exploration and production wells and their remanences will be in contact with reservoir brines of dynamic geochemical properties. Thus, cement degradation and steel corrosion of these old legacy wells are expected with risks for the stored fluids to leak outside the anticipated storage unit. To detect and monitor wells numerical simulations are necessary. We explore the potential of non-invasive monitoring for qualifying legacy well integrity. Relative differences in plug/no-plug scenarios show promise for plug detection in legacy wells. Additionally, we evaluate the geophysical observable changes due to fluid injection with respect to hydrogen and ammonia saturation. Preliminary results indicate that H2 monitoring with seismic methods might be challenging and CSEM monitoring is probably the better method. Seismic observables are however very sensitive to ammonia saturation changes.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202310753
2023-06-05
2026-02-10

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References

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/content/papers/10.3997/2214-4609.202310753
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De-risking legacy well integrity to unlock storage potential of the Frigg field, North Sea Norway
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202310753
/content/papers/10.3997/2214-4609.202310753
/content/papers/10.3997/2214-4609.202310753
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