System containing expendible isolation valve with frangible sealing member, seat arrangement and method for use
US5188182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | May 10, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An isolation valve for a downhole well completion system having a one piece frangible, ceramic sealing element and an extrusion resistant resiliently faced valve seat and a method for the use thereof is presented. Said sealing element is biased to the closed position and rotatable within a sealing element chamber from an open position during run in to a closed position as a result of the withdrawal of a wash pipe and a protector tube from the valve bore. Said frangible sealing element cooperates with said extrusion resistant valve seat to provide a reliable pressure resistant seal. After recovery of completion fluids from the well bore and pressure testing of the production string, the frangible sealing element is shattered by impacting with a tooth-faced blind box hammer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.