Method and apparatus for combined cement bond and acoustic well logging
US4495606A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1981 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Aug 31, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus are provided for measuring acoustic signals having amplitudes of widely varying magnitude during one traversal of the borehole corresponding to indications of cement bonding along a casing as well as acoustic travel time through an increment of the formation. Variable attenuators are provided associated with acoustic receivers disposed within the logging sonde wherein attenuation may be automatically adjusted as a function of acoustic transmitter-receiver trigger pulses transmitted downhole, depending upon whether a cement bond or other log of acoustic signal information having a substantially different magnitude is desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.