Shear rams for hydrogen sulfide service
US4081027A · kind A · utility
44Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1976 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Aug 23, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9447
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Shear rams shearing drill pipe passing through with blowout preventers encountering hydrogen sulfide are disclosed. The ram bodies are formed of an alloy having an upper hardness level of about Rc22 and the shearing blade and drill string engaging surfaces of the rams are hardfaced with a layer of nickel-based alloys, cobalt-based alloys, and tungsten-based alloys hard enough to shear the drill pipe. The layer of alloy is thin enough to avoid peeling off in use and warping the ram bodies when being welded to them. A number of embodiments and examples of the invention is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.