| 摘要 |
A ring member for a downhole apparatus including a swellable material select ed to increase in volume on exposure to at least one triggering fluid is described . The ring member is configured to co-operate with a swellable member disposed on a bod y of the apparatus, and may for example function as a gauge ring or a retaining membe r, The ring member is secured to the apparatus via a coupling arrangement which couples the body to an adjacent well string section. In one embodiment the ring member is thread ed into the well string. In another, it is disposed over an upstanding formation such as a coupling sleeve, for example by clamping. An assembly and a method of assembly are al so described.
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