Borehole logging tools and methods using reflected electromagnetic signals
US5530359A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1995 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Feb 3, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A borehole logging tool such as a wireline logging tool or a logging-while drilling tool includes a tool body; a transmitting antenna located in the body; a pulser for causing the transmitting antenna to transmit an electromagnetic signal; a receiving antenna, located in the body, which includes an array of receiver elements disposed around the longitudinal axis of the tool body; and electronics for measuring the difference in signals detected by pairs of elements in the array. The receiver elements can be linear dipole elements and the electronics for analyzing the signals measures the difference in signals measured by pairs of elements so as to determine the direction of a reflecting structure from the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.