Liner connection
US4707001A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Jun 20, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/003
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A connection for plain end well liner pipe and the like uses a threaded pin and box having a locking reverse angle thread profile to prevent radial separation of the pin and box due to deep well pressure and make-up pressures. The connection includes a primary internal seal structure wherein a metal-to-metal interference seal is located adjacent a thermoplastic ring seal. Separation of the interference seal due to the proximity of the thermoplastic seal is prevented by the locking thread profile. An external seal uses a metal-to-metal interference seal enhanced by a locking torque shoulder seal which acts with the thread profile to prevent radial separation of the interference seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.