Magnetic well cleaning apparatus
US6655462B1 · kind B1 · utility
50Cited by
25References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 2000 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | May 26, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus which can collect loose debris, particularly ferrous debris, has a body 2 with upper 3 and lower 4 stabiliser sleeve. The body 2 has a one or more integral magnets or magnetic areas 5. In one embodiment the magnets are located in a first and second row on a split sleeve 6 and are covered by a protective stainless steel sleeve7. The apparatus may alternatively comprise magnetic scraper blades or a magnetic sub. The magnets are selectively activated. There is also described a method of trapping or retaining debris in a well bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.