| 摘要 |
<p>Drill stem element for drilling a well with flow of a drilling fluid around the element and in a direction extending from a drilling well bottom towards the surface, comprising a member (5) and a coupling (8) which is mounted for rotation about the member. The coupling (8) comprises at least two abutment zones (13, 14) on the wall of the well during drilling, each abutment zone (13, 14) being externally provided with at least one abutment portion (13a, 14a) having an outer diameter greater than the diameter of the other portions of the element, each abutment zone (13, 14) having a convex rounded shape generated by revolution, each abutment zone (13, 14) being axially remote from at least one other abutment zone, the coupling (8) comprising an intermediate zone (15) which is provided between the two abutment zones (13, 14), an opening being provided between the coupling (8) and the member (5) for the flow of drilling fluid between the coupling (8) and the member (5) forming a fluid bearing.</p> |
