| 摘要 |
<p>The invention concerns a drilling part (10) comprising at least two mutually axially spaced zones, shaped to be urged to rest against the cement sheath (5) wall; the conduit axis (11, 31) forms a non-null angle with the part (10, 30), corresponding to the angle formed by longitudinal axis of the cavity delimited by the cement sheath (5) with the corporeal cavity (4) longitudinal axis; and said zones and said conduit (11, 31) are mutually positioned such that the conduit (11, 31) axis coincides with the corporeal cavity (4) axis when said zones are resting against the cement sheath (5) wall.</p> |
