Abstract
Hydraulic stimulation is performed by a high-pressure fluid injection, which permanently increases the permeability of a volume of rock. After a period of stimulation, fluid injection and recovery boreholes are introduced into the stimulated rock volume and heat is extracted by water circulation. In the present study a simplified mathematical model of the non-steady hydraulic stimulation is proposed and solved numerically. Fluid flow is assumed to be radial, injection flow rate constant; and rock porosity and permeability depend on fluid pressure. The conventional boundary of the growing stimulated rock volume is introduced as a surface where porosity and permeability of the stimulated rock exhibit a sharp decline and remain constant within undisturbed area. As a result, the pressure distributions in the stimulated and non-stimulated volume areas are obtained and the equation for the moving boundary of the stimulated volume is derived.
| Original language | English |
|---|---|
| Pages (from-to) | 197-200 |
| Number of pages | 4 |
| Journal | Transactions - Geothermal Resources Council |
| Volume | 29 |
| Publication status | Published - 2005 |
| Event | Geothermal Resources Council 2005 Annual Meeting - Reno, NV, United States Duration: 2005 Sept 25 → 2005 Sept 28 |
Keywords
- Artificial Reservoir
- EGS
- Enhanced Geothermal Systems
- HDR
- Hot Dry Rock
- Hydraulic Stimulation
- Numerical Simulation
