Downhole jarring tool with reduced wear latch
US8225860B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 2009 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Oct 19, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/107
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A jarring tool having an extensible joint connecting first and second sub ends. A first inner latch piece connects to the upper sub end, and a second outer latch piece connects to the lower sub end. The joint, in a latched position, has the outer latch piece latched to the inner latch piece and the inner and outer latch pieces restrained from unlatching by a stationary restraining collar. Under tensile force the joint unlatches into an unlatched position by the outer latch piece pulling the inner latch piece through the restraining collar into a position where the inner and outer latch pieces are free to separate. An impact force is generated from the tensile force when the joint unlatches and reaches a maximum extension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.