Electromagnetic ranging source suitable for use in a drill string
US9534488B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2014 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Jul 18, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electromagnetic ranging source includes: a tubular body having a circumference; a ferromagnetic core conforming to the tubular body and extending at least halfway around the circumference to define a gap with circumferentially-spaced poles; one or more current-carrying windings around the core to induce a magnetic field between the poles; and a downhole power source that drives the one or more current-carrying windings. A related method includes: equipping a first drill string with such an electromagnetic ranging source; extending a first borehole with the first drill string; assembling a second drill string with sensors; and drilling a second borehole while using said sensors to guide the second drill string relative to the first borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.