Retractable downhole backup assembly for circumferential seal support
US8307891B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2010 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Apr 15, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/129
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Wedge shaped elements form a ring structure that can increase in diameter for a grip using relative axial motion of adjacent segments. The adjacent seal is further separated from access to the edges of the adjacent segments that move relatively by ring segments attached to the wide dimension of the segments that face the seal. The ring segments move out with the wedge elements to which they are attached so that in the set position of the seal there is an enhanced barrier against the surrounding tubular with the ring segments. The ring segments further block access of the seal under compressive loading to the interface locations between the wedge shaped elements so that their relative axial movement does not trap a portion of the seal and initiate cracks in the seal that can lead to leakage past the seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.