Abstract
The authors carried out in-situ hydraulic fracturing experiments at an underground site. Stress measurements by double fracture method were carried out in order to get the initial stress state around the site. The surface profiles of the wall created by blasting, the fracture opened by hydrofracturing along a natural joint, and the fracture artificially created by hydrofracturing assisted by pre-slotting were measured by using the field surface profiler. Fractal dimensions were determined for those profiles by four kinds of fractal analysis. The tests of fluid injection and circulation through the artificial fracture were carried out, and the characteristics of water flow in the fracture and rock behaviour around the fracture were investigated by in-situ measurements of rock surface displacement and fluid pressure in the fracture. Numerical simulations of the tests were carried out. Far field stress state was determined considering the local stress state measured by the double fracture method and stress concentration around the opening.
| Original language | English |
|---|---|
| Pages (from-to) | 281-297 |
| Number of pages | 17 |
| Journal | Geothermal Science and Technology |
| Volume | 6 |
| Issue number | 1-4 |
| Publication status | Published - 1999 |
| Externally published | Yes |
Keywords
- Fluid injection
- In-situ experiment
- Numerical simulation
- Stress measurement
- Surface profile
ASJC Scopus subject areas
- Water Science and Technology
- Ocean Engineering
- Management of Technology and Innovation