| 摘要 |
An expandable centralizer is disclosed having a body having a first portion of circular cross-section and a second portion of polyhedral cross-section. Centralizing members are arranged on the faces of the second portion which, in a first position, limit the diameter of the tool so that it can pass through small openings in a wellbore. The centralizing members can then be moved hydraulically across the faces to extend and provide support for the expandable downhole tool in larger openings within the wellbore.
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