Well logging apparatus for investigating earth formations
US5359324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1993 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | May 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A logging-while-drilling system is disclosed in which a first subassembly is included near the drill bit, and this subassembly comprises a conducting body with measuring means disposed in it and a first toroidal coil antenna disposed on the body, means for coupling a local communication signal generated from the measuring means to the first toroidal coil antenna, and where the measuring means includes means to energize the first toroidal coil antenna with a measurement signal and means mounted on the conductive body to receive the measurement signal after it passes through the formations to be measured. The system further includes a second subassembly near the drill bit which includes a second conducting body with a second toroidal coil antenna mounted on it and means to receive the local communication signal through the second toroidal coil and means to generate a surface communication signal from the local communication signal and transmit it through an acoustic transmitter to the surface, where it is received by an acoustic receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.