Temperature compensating hydraulic jarring tool
US4210214A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Oct 6, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/113
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic jarring tool is provided that vents pressure slowly from the tool's internal operating fluid chamber to allow maximum filling of the tool prior to the tool's entering a well and to provide for operating fluid expansion with temperature increases. The jarring tool includes an outer member and an inner member telescopically arranged. Spline means between said outer member and said inner member transmit torque. A hammer and anvil system provide a jarring effect upon actuation of the tool. An operating fluid is maintained in an operating fluid chamber between the outer and inner members. Seal means between the outer and inner members provides a fluid seal to contain the operating fluid. The seal means includes a seal and thermal relief valve assembly mounted for axial travel between said inner member and said outer member with a passage extending therethrough. A thermal relief valve means in the passage provides pressure equalization. The thermal relief valve means provides a controlled flow of operating fluid from the operating fluid chamber to relieve excessive fluid pressure without undue loss of operating fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.