Method of measuring crustal stress by hydraulic fracture based on analysis of crack growth in rock
US4665984A · kind A · utility
17Cited by
11References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1986 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Aug 14, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Earth's crustal stress is measured by drilling a bore-hole in rock body, producing a longitudinal crack at a selected portion thereof with or without a natural traverse crack through intermittent application of hydraulic pressure thereat while measuring the pressure at different stages of crack production, producing an artificial traverse cracks through the use of a prenotch, determining orientations of the cracks thus produced by inspecting the bore-hole surface conditions, and numerically analyzing the crack orientations and the pressures at different stages of crack production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.