Threaded joint for oil well pipes
US5829797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1995 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Nov 21, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/042
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A threaded joint for an oil well pipe having (1) a tapered threaded having roughly the shape of a buttress thread, (2) a pin having a male thread and a box having a female thread, (3) a seal and a torque shoulder, characterized in that PA1 (i) the load flank angle of the threads is -20.degree. or greater and less than 0.degree., PA1 the stab flank angle is greater than 30.degree. and at most 60.degree. PA1 (ii) there is a positive amount of interference between the male threads and the female threads, and PA1 (iii) during and at the completion of make-up, the load flanks and the stab flanks are contacting each other, and there is a gap between the crests and the roots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.