| 摘要 |
A slip spool for selectively supporting a tubing string suspended in a wellhead can be mounted to a wellhead. The slip spool has an axial passage to be aligned with the wellbore and at least two radial passages extending through a side wall of the slip spool and communicating with the axial passage. At least two slip anchors, each pivotally connecting with a wedge-shaped slip jaw, are slidably received within the respective radial passages. The slip spool further includes actuators for moving the respective combinations of the slip anchors and slip jaws between a retracted position in which the slip jaws clear the axial passage of the slip spool, and an extended position in which each wedge-shaped slip jaw is inserted into an annulus between the axial passage of the slip spool and tubing string to transfer the weight of the tubing string into a lateral gripping pressure exerted on the tubing string. The radial passages extend at an angle with respect to the axis of the axial passage which is much greater than the wedge angle of the slips, thereby reducing the total height of the slip spool which is convenient for well operation. The slip spool facilitates live well service operations.
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