Well pressure test plug
US4121660A · kind A · utility
32Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1977 |
| Grant date | Oct 24, 1978 |
| Priority date | — |
| Expiry date | Aug 22, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/117
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A test plug for use in pressure testing a Christmas tree and blowout preventer atop an oil or gas wellhead. The test plug includes a cylindrical body having an outer diameter slightly smaller than the bore of the wellhead, and a plurality of support dogs that fit into an annular groove in the wellhead to support the plug during pressure testing. The plug is landed on a relatively narrow shoulder in the bore of the wellhead and the dogs are then extended into the groove by vertical movement of a mandrel, thereby lifting the plug off the shoulder and securely supporting it in test position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.