Subsurface annular safety barrier
US7140447B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2003 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Jun 3, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsurface annular safety barrier including a tubing disposed within a wellbore casing forming a casing-tubing annulus to allow fluid flow from and/or to a subterranean formation, and an annular barrier carried by the tubing and positioned in the casing-tubing annulus proximate the top of a formation, separating communication between the formation and the upper portion of the casing-tubing annulus above the annular barrier, wherein the annular barrier is set in an open position to allow fluid communication between the formation and the upper portion of the casing-tubing annulus and operationally activatable, without mechanical manipulation of a pipe string, to a closed position to prevent undesired fluid flow between the formation and upper portion of the casing-tubing annulus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.