Redundant safety valve system and method
US4605070A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1985 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Apr 1, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/106
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A first well tubing with a tubing retrievable safety valve having a bore of substantially the same size as the bore of the first well tubing. A second well tubing is connected to the first well tubing above the first well tubing and extends to the well surface and the second well tubing has a bore larger than the bore of the first well tubing. A landing nipple in the second well tubing has substantially the same size bore as the bore of the second well tubing. A wireline retrievable safety valve positioned in the interior of the landing nipple has a bore only slightly smaller than the bore of the first well tubing and thereby does not unduly restrict the flow of fluid through the well tubing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.