Method, system and apparatus for determining rock strength using sonic logging
US7526385B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 2007 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Jun 22, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is disclosed for determining a rock strength of an Earth formation, including: receiving a signal representing a measured variation of velocities or slownesses as function of radius from and azimuth around a borehole; generating predictions from a Mechanical Earth Model (MEM) representing predictions of a variation of stress and hence velocity as a function of distance from, and azimuth around, the borehole, the MEM including a rock strength model adapted for generating a further prediction representing a predicted variation of velocities or slowness; changing the rock strength in the rock strength model of the Mechanical Earth Model until the further prediction substantially matches the measured variation in velocity around and from the borehole; and generating a set of parameters, wherein the parameters are used to populate the MEM and are used in subsequent calculations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.