Remotely adjustable fishing jar and method for using same
US5156211A · kind A · utility
15Cited by
4References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1991 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Jun 10, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/107
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A remotely-adjustable, downhole fishing jar of the mechanical type is used within a well bore for freeing stuck pipe or tools. The jar, while downhole, can be set or reset by an operator at the surface for each firing stroke for any desired impact force within the capability of the finishing string to apply tension to the jar. A selected amount of tension to the fishing string is applied by the operator to set in a mechanical memory of the jar the desired impact force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.