| 摘要 |
<p>A lock mandrel for use in a locking system to releasably position well flow control devices in a flow conduit of a well. A lock mandrel (15) and a landing nipple (10) are mounted in a conduit. The lock mandrel has a longitudinal flow passage (15a) therethrough, and includes (a) an upper mandrel (17) with openings (18); (b) helically profiled segment means (19) to locate the locking mandrel in the landing nipple, which segment means are radially moveable in the openings; (c) a support (22) mounted in a first position in said mandrel, in which position the profiled segment means (19) are expanded, and is slidably moveable to a second position, in which the profiled segment means are in a retracted position; (d) a lower body (26) with a metal sealing surface (26a); (e) means (24) swivelably connected to the upper mandrel; and (f) force transmitting means (W) for transmitting force between the upper mandrel and said lower body. <IMAGE></p> |
