Buttress-threaded tubular connection
US5358289A · kind A · utility
150Cited by
13References
22Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 13, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Mar 13, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention pertains to an improvement in buttress-threaded tubular connections. In particular, the connection is improved by controlling the tubular member thread pitch diameter tolerance to .+-.0.0015 inch, to provide a thread bearing contact pressure which is relatively constant over the entire length of the connection. In addition, the improved connection provides a reduction in hoop stress of about 20% over known buttress-threaded tubing connections. The present invention typically includes the use of variable make-up in combination with the control of the tubular member thread pitch diameter tolerance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.