Oil well casing and tubing joint and production of same
US4474651A · kind A · utility
29Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1982 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Aug 13, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L58/182
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A joint for used in connecting oil well casing and/or tubing and method of producing same are disclosed. The joint with improved metal-to-metal sealing properties as well as improved resistance to galling is made of an alloy steel containing 10% or more by weight of Cr and comprises a metal sealing portion and a threaded portion provided with an activating layer of a metal or an alloy selected iron, nickel, zinc, cobalt, copper, manganese, chromium and alloys thereof, and an electrodeposited layer of a metal or an alloy selected from iron, copper, zinc, chromium, nickel, and alloys thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.