Electromagnetic resistivity tool and method for use of same
US6114972A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1998 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Jan 20, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for obtaining resistivity readings of the earth surrounding a wellbore (32) to determine the downhole location of the apparatus or to generate a log is disclosed. The apparatus comprises an electromagnetic transmitter (40) for transmitting electromagnetic waves (42, 46) into the earth and an electronics package (122). The electronics package includes a power source (200) providing a current to the electromagnetic transmitter (40), a current sensing device (204) for detecting the current drawn by the electromagnetic transmitter (40), a sample and hold circuit (210) for sampling the current drawn by the electromagnetic transmitter (40) and a memory device (214) for storing the current draw information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.