| 摘要 |
<p>A device (1) for ensuring continuous circulation in well drilling comprises a tubular body (2), having an axial channel (2) therein, with a lateral opening (3) closed by a removable plug (5). A tubular support (9) is placed in the axial conduit, and supports a shut- off member (6) which is held in position by retainer means. Advantageously, these retainer means comprise a plurality of cylindrical retainer elements (14), which are placed in the tubular conduit in circumferentially offset arrangement, near an upper head end (9a) of the tubular support (9), such that a first portion thereof engages a corresponding inner seat provided in the inner wall of the tubular conduit.</p> |
