Threaded joint for oil-well pipe
US4830411A · kind A · utility
25Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Feb 12, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/042
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A threaded joint for oil-well pipe comprises a box having an internal thread, a pin having an external thread, a metal-to-metal sealing contact provided at the unthreaded tips of the box and pin, and a film of grease applied on the surface of the internal and external threads. The cross-sectional area of a void containing the screw axis left between the meshed internal and external threads is at least 0.6 mm.sup.2 per pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.