For geothermal energy development, we verify in this paper the existence of an optimum temperature difference for injection, ΔTc. Injectivity of geothermal wells depends on the temperature difference between the rock and injected fluid, ΔT. If fluid injection into a well is carried out with ΔT larger than ΔTc, the injectivity of the well will be high, since the low-temperature flow induces sufficient thermal contraction to open fractures and increase permeability. However, such high injectivity is not expected if ΔT is smaller than ΔTc. We derive an expression for ΔTc based on a simple elastic model, and the formulation is verified through comparison with the results of 2D-FEM simulations and field tests.
|Number of pages||4|
|Journal||Transactions - Geothermal Resources Council|
|Publication status||Published - 2003|
|Event||International Collaboration for Geothermal Energy in the Americas - Geothermal Resources Counsil: 2003 Annual Meeting - Morelia, Michoacan, Mexico|
Duration: 2003 Oct 12 → 2003 Oct 15
- Geothermal well
- Thermal stress