Expandable packer assembly for sealing a well screen to a casing
US4482086A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1983 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Aug 4, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Improved packer assembly for sealing a well screen to a casing avoids contamination problems of expandable lead packers and the abrasion of self-sealing packers which can be rendered ineffective before they reach their intended depth. A pair of annular end members, adapted to be threaded to the well screen and to the drill stem, are joined by a compressible, tubular metal portion. When the well screen is at its intended depth, a swedge dropped against the upper end member of the packer assembly will compress the ends of the tubular metal portion toward each other while the intermediate portion expands into sealing relation with the casing. The seal can be enhanced by applying rings or layers of elastomeric material to the tubular metal portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.