retrievable inner barrel

retrievable inner barrel

[ri′trēv·ə·bəl ′in·ər ′bar·əl]
(engineering)
The inner barrel assembly of a wire-line core barrel, designed for removing core from a borehole without pulling the rods.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.