Apparatus and method for determining velocity of acoustic waves in earth formations
US4367541A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1979 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Dec 6, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disclosure is directed to an apparatus and method for determining the velocity of acoustic wave energy propagating information surrounding a borehole. In accordance with one form of the apparatus, a transmitter is positioned in the borehole and periodically establishes acoustic wave energy in the surrounding formations. The acoustic wave energy is received at a plurality of spaced locations in the borehole and a plurality of signals are derived which are respectively representative of the wave energy received at the plurality of spaced locations in the borehole. Means are provided, for correcting a first portion of the signal from one of the receiver locations with first portions of signals from the other receiver locations. The time references of the first portion of the signals from the other locations are determined from an assumed velocity in conjunction with the time reference of the first portion of the signal from the one receiver location and the distance to each of the other receivers. The correlating is performed for a number of different assumed velocities to obtain a resultant first provisional velocity. In particular, the assumed velocity which yields substantially…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.