| 摘要 |
Downhole apparatus comprising a fluid pressure deformable chamber 14 for location on a base member, the chamber having a body having a first portion of a first length, width and depth, a second portion having at least one of a second depth and width less than the first portion, and a transition portion coupling the first and second portions and configured to provide for a progression between deformation characteristics of the first and second portions. The second portion may be adapted to secure the chamber on the base member. A plurality of chambers may be provided around the base member. |
