Well tool hydrostatic release means
US4976317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Jul 31, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A release mechanism for use in a well tool that requires a hydraulic piston area to be equalized with a minimum force. A valve seat and valve element are positioned in a fluid passageway for actuating the assembly. A rod having a first and second section is connected to the assembly and movable for moving the second section into the valve seat. The second section has a smaller cross-sectional area and smaller length than the first section. The area of the valve seat is less than the cross-sectional area of first section but larger than the second section. The release mechanism allows the sealing area to be reduced without reducing the strength of the rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.