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