Tubular connection
US4508375A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1982 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Sep 20, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/08
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention relates to tubular connections for application to heavy wall, high performance casing in high pressure, critical service oil and gas wells. A threaded and coupled tubular connection is provided which comprises a male member and a female member having engageable threads disposed on respective first and second substantially matching tapers of about 1.750 inches per foot on the diameter. This taper provides increased female member wall thickness at the narrow end of the female taper; increases the perfect thread length; provides deeper stabbing of the male member into the female member; reduces leakage path clearances; and reduces the male member-in-female member position tolerance. The taper tolerances of the male and female thread tapers are staggered to provide a lower taper on the male member and a higher taper on the female member which results in an advantageous taper mismatch insuring sealing and interference within the made-up connection adjacent the narrow end of the male member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.