Methods and apparatus for generating electromagnetic telemetry signals
US9988855B2 · kind B2 · utility
0Cited by
9References
20Claims
0Family size
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Key dates
| Filing date | May 3, 2017 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | May 3, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electromagnetic telemetry signal generating assembly comprises a first section of drill string, a second section of drill string, a gap sub configured to insulate the first section from the second section, and a power source configured to provide a first voltage to a control circuit. The control circuit is configured to drive a second voltage between the sections of drill string. The gap sub provides a gap of at least 12 inches (30 cm). The second voltage may be different than the first voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.