A Study of Permeability Changes Due to Cold Fluid Circulation in Fractured Geothermal Reservoirs

Ground Water
Nima Gholizadeh DoonechalySheik S Rahman

Abstract

Reservoir behavior due to injection and circulation of cold fluid is studied with a shear displacement model based on the distributed dislocation technique, in a poro-thermoelastic environment. The approach is applied to a selected volume of Soultz geothermal reservoir at a depth range of 3600 to 3700 m. Permeability enhancement and geothermal potential of Soultz geothermal reservoir are assessed over a stimulation period of 3 months and a fluid circulation period of 14 years. This study-by shedding light onto another source of uncertainty-points toward a special role for the fracture surface asperities in predicting the shear dilation of fractures. It was also observed that thermal stress has a significant impact on changing the reservoir stress field. The effect of thermal stresses on reservoir behavior is more evident over longer circulation term as the rock matrix temperature is significantly lowered. Change in the fracture permeability due to the thermal stresses can also lead to the short circuiting between the injection and production wells which in turn decreases the produced fluid temperature significantly. The effect of thermal stress persists during the whole circulation period as it has significant impact on the con...Continue Reading

References

Feb 1, 1996·The Australian & New Zealand Journal of Obstetrics & Gynaecology·W R Edwards
Mar 9, 2007·Annals of the New York Academy of Sciences·Jennifer D Nolt, Francesca R Geertsma

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