Tool for recovering junk and debris from a wellbore of a well
US8453724B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2010 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Sep 28, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole tool incorporates a junk catcher with full body casing drift. It is made of an inner tubular member that conveys the hydraulic power or circulating fluid to rearward and outward facing jet nozzles for directly flushing downhole junks in front of the tool (if encountered) into a junk collecting barrel equipped with individual magnets to retain magnetically attractive metal junks. The barrel is made of high grade steel material with outer diameter matching the full drift of wellbore casing. The front, or the lower end of the outer body is addressed with tungsten carbide cutters to effectively handle metal junks in case of milling action is required. The back, or upper end of the barrel has return flow ports equipped with a filter screen to retain small, medium and large size junks while fluid is pumped through the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.