Method and apparatus for isolating a plurality of vertically spaced perforations in a well conduit
US4735266A · kind A · utility
4Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1986 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Oct 23, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/124
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A plurality of packing elements are mounted in vertically spaced relationship on a tubing string with the spacing of the elements corresponding generally to the spacing of a plurality of sets of perforations in a well conduit. The lowermost packing unit is provided with radially expanding locking elements which engage a locking groove provided in the well conduit. All packing units incorporate expandable elastomeric sealing members and are set by the application of tension to the tubing string and are unset by the subsequent application of a higher degree of tension to the tubing string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.