Rotating multi-parameter bond tool
US5763773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Sep 20, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A multi-part logging tool that allows measurement of several distinct independent parameters, which are in turn used to solve for secondary parameters that give information about the properties of the cement outside the casing. Secondary parameters affecting the measured signals are: casing thickness, bond of cement to casing, cement acoustic impedance, cement thickness, channel size and channel material. The present invention comprises a rotating tool that supports a plurality of specifically configured transducers that interrogate a region behind casing having a 10 degree azimuthal resolution and a depth of investigation of at least 0.75 inches behind casing. The transducers on the rotating tool include an array of angled beam transducers, a single-housing pitch-catch transducer and a radial, pulse echo transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.