| 摘要 |
<p>A riser displacement tool 10, sealingly movable over a string 11 and sealingly movable within a riser to inhibit fluid bypass around the tool within the riser, comprises a running tool 8 attachable to a work string 11 and a supporting fluid displacing body 1 having a head portion 6 provided with an opening 12 to accommodate relative movement relative to the work string, and flexible wiper elements 2 providing dynamic sealing contact with adjacent surfaces of the work string and a riser 20, and a skirt 5 depending from the head portion 6 and enclosing a chamber 7 for receiving a fluid. The fluid displacing body is adapted to sealingly engage the riser. The string and is selectively releasable from an initial configuration supported by the running tool to an operational configuration axially displaceable from the running tool by introduction of a fluid to the chamber 7.</p> |
