| 摘要 |
System (1) for increasing the diameter of at least a portion of a well bore, the system being intended to be attached to a drill pipe (3), the system having the improvement that the support element (10) bearing the curring arms (13, 14) is movably mounted with respect to the body (4) and that the arms and the chamber (6) of the body (4) are designed so as to cooperate.
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