Safety plug for sealing-off the tubing of a producing oil or gas well
US3954138A · kind A · utility
34Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1974 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Nov 12, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1669
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety plug for sealing-off the tubing in a deep producing well comprises a body fitted within the tubing by means of O-ring seals, an axial valve having two heads in opposition which are capable of being applied against top and bottom seatings of the body, and an axial push-rod unit connected to the valve. The push-rod unit as well as the valve are positioned with respect to the body and with respect to the top and bottom seatings by means of shearing-pins, a spring being placed between the valve and the lower end of the body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.