Lock ring for pipe slip pick-up ring
US6536532B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 2001 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Mar 1, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A selectively released well packer is set between a pair of anchor shoe assemblies. Each assembly comprises a tubular setting sleeve having finger projections meshed with an anchor shoe cage. Wicker shoes are confined by the shoe cage. The packer seal and shoes are set by an axial translation of one shoe cage toward the other driven by a hydraulic sleeve piston. The packer is released by cutting the mandrel and pulling up on the tubing string. The uphole shoe cage is secured to the mandrel with limited axial freedom. Upward translation of the uphole portion of the severed mandrel therefore disengages the uphole anchor shoes and the packer seal. A buttress thread section of the mandrel engages a corresponding thread on the downhole setting sleeve to sequentially release the downhole anchor shoe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.