Multiple-completion packer and locking element therefor
US5425418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1994 |
| Grant date | Jun 20, 1995 |
| Priority date | — |
| Expiry date | Apr 26, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/122
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a multi-bore packer that has an annularly shaped sealing element. The assembly has a series of strings that run continuously so that they can be supported from the surface. At least one hub segment straddles the strings and is sealed in between. The entire assembly features one of the hubs with a sealing element. The outer sealing element, when compressed, seals against a casing or wellbore as well as against one of the hubs through which the strings extend. A greater effective piston area allows setting with surface pressures below 2500 psig. A provision is made in the assembly of hubs to provide for an operating mechanism to compress the outer seal between the casing and the hub, by increasing the applied sealing forces on the outer seal, should well conditions apply greater differential pressures, in either direction, to the outer seal than the original setting pressure used. A longitudinal lock is provided between a movable piston segment and one of the hubs to avoid actuation of the outer seal against the casing until a predetermined force is applied. During make-up, a secondary lock can be applied to the locking mechanism for pressure-testing purposes…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.