| 摘要 |
A well tool locates within a subsea wellhead to seal and isolate the wellhead from testing of blowout preventer stack located on a riser string extending from the wellhead to a surface vessel. The well tool has a mandrel and a body which are axially moveable relative to each other. The body has a locking element which can move from a radially retracted position outward to engage grooves in the wellhead. The body also has an elastomeric seal for sealing the interior of the wellhead. A wedge ring has a compression member mounted to it for energizing the seal. Simultaneously, the wedge ring pushes the dogs outward. The wedge ring moves downward with the mandrel. A retaining assembly will retain the mandrel in the upper position until it is desired to set the tool. The retainer releases the mandrel for moving downward by rotating less than one turn. The wedging surfaces can be moved to a disengaging position to disengage the wedging surfaces from actuating the locking element. A second embodiment allows the isolation tool to also be utilized as a running tool.
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