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underground gas storage

Storing gas in porous rock can lead to problems with the integrity of the overburden or reactivation of fault zones bounding the reservoir. By creating accurate subsurface models and calibrating the subsurface model against existing data, we can predict the geomechanical system behaviour and solve all geomechanical problems.

The prediction of the geomechanical system behaviour of an underground gas storage during injection and withdrawal of gas requires a good knowledge of the reservoir, the geological trap and additional parameters describing, for example, the two-phase or multi-phase flow in the subsurface. We aim for an accurate reconstruction of the subsurface in our numerical model, a robust calibration of the subsurface model using existing data, and modelling of multiphase flow in porous rocks using established physical methods, e.g. poroelasticity and capillary pressure models (e.g. Brooks and Corey), to obtain a realistic distribution of gas/water contact, pressure and stress in the subsurface. This enables the assessment of the impact of changes in production and injection rates on the integrity of the overburden, fault stability, drawdown and well integrity.

outcome

  • development of gas-water contact
  • optimization of injection and production rates
  • caprock integrity, fault stability assessment
  • heave and subsidence

selected references

  • Internationally active storage operator - Integrity of the overburden and fault zones
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