Rare earth alloys as borehole markers
US10539006B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2014 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Jan 20, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A magnetic marking method includes drilling a borehole and marking a position along an uncased section of the borehole with a magnetic marker comprising a magnetic rare earth alloy. A magnetic marker for open hole use includes an unconsolidated mass of high remanence, magnetized material that comprises a magnetic rare earth alloy. The magnetic marker for open hole use also includes a suspension fluid suited for conveying the magnetized material through a drill string bore into an open borehole. A magnetic marker for a casing terminus includes a magnet comprising a magnetic rare earth alloy and an attachment mechanism that secures the magnet to a casing shoe. Such magnetic markers for open hole use or a casing terminus can be used for borehole intersection operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.