Electromagnetic telemetry using capacitive surface electrodes
US10227868B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2016 |
| Grant date | Mar 12, 2019 |
| Priority date | — |
| Expiry date | Jan 8, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2003/084
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for signal communication between a well drilling instrument and the Earth's surface includes generating an electromagnetic field in an instrument disposed in drill string used to drill a wellbore. The electromagnetic field comprises encoded measurements from at least one sensor associated with the instrument. A signal is measured corresponding to an amplitude, phase or frequency of the electromagnetic field. The measurements are decoded from the measured signal. The measured signal comprises at least one of a voltage imparted across a capacitive electrode proximate ground surface and a galvanic electrode in contact with the ground surface, and a voltage imparted across two capacitive electrodes each proximate a ground surface and separated from each other by a known distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.