Dual hydraulic set packer
US4930573A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Apr 6, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/122
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dual string packer for releasable, hydraulic setting within a wall casing is disclosed. The packing seal elements and hydraulic actuator assembly are mounted for sliding movement along primary and secondary packer mandrels. Setting forces are applied to the packing seal elements by a setting cylinder which is mounted for slideable, sealing engagement against the primary and secondary packer mandrels, and setting forces are applied to the anchor slips by a piston which is sealed against the primary and secondary packer mandrels. The set condition is maintained by a pair of locking rods and segmented ratchet slips. The locking rods are carried by the setting cylinder head and are retracted axially out of piston pockets as a variable volume pressure chamber is pressurized. Upon achieving set engagement of the anchor slips and seal elements, the locking rods are trapped in compression between the head of the setting cylinder and the segmented ratchet slips. The locking rods are compressed by the reaction forces imposed by the expandable seal elements through the head of the setting cylinder, and by the retraction forces transmitted through the anchor slips and piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.