| 摘要 |
An improved sealing apparatus (10, 110) for use in establishing a seal in an annulus (12,112) between a mandrel (18,118) and a bore wall (14,114) has an annular seal element (20,120) activateable between a first, retracted, configuration and a second, expanded, configuration. The seal element (20, 120) is disposed around a mandrel (18,118) and is free to move relative the mandrel (18,118) such that when the seal element (20,120) defines the second, expanded, configuration, pressurised fluid from the annulus (12;112) urges the seal element (20,120) radially outwards into sealing or enhanced sealing engagement with the bore wall (14,114). |
