System and method to create three-dimensional images of non-linear acoustic properties in a region remote from a borehole
US8345509B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 11, 2009 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jan 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/588
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool is disclosed. In some aspects, the method includes arranging a first source in the borehole and generating a steered beam of elastic energy at a first frequency; arranging a second source in the borehole and generating a steerable beam of elastic energy at a second frequency, such that the steerable beam at the first frequency and the steerable beam at the second frequency intercept at a location away from the borehole; receiving at the borehole by a sensor a third elastic wave, created by a three wave mixing process, with a frequency equal to a difference between the first and second frequencies and a direction of propagation towards the borehole; determining a location of a three wave mixing region based on the arrangement of the first and second sources and on properties of the third wave signal; and creating three-dimensional images of the non-linear properties using data recorded by repeating the generating, receiving and determining at a plurality of azimuths, i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.