Washout mechanism for offshore wells
Patent
·
OSTI ID:5717229
This patent describes a running tool for installing a casing hanger in a subsea tubular conductor, the casing hanger being connected to the upper end of a string of casing for landing in the tubular conductor. It comprises a tubular tool body adapted to be connected to a string of conduit; means on the tool body for releasably connecting the tool body to the casing hanger for lowering the casing string into the tubular conductor and landing the casing hanger in the tubular conductor; an internal sleeve; means for mounting the internal sleeve in the interior of the tool body for rotational movement only relative to the tool body a set of threads located on the exterior of the internal sleeve; at least one slot located in the interior of the internal sleeve; a torque member adapted to be lowered through the conduit to the internal sleeve; means on the torque member for engaging the slot in the internal sleeve to cause the internal sleeve to rotate when the torque member rotates; at least one wash port extending from the interior of the tool body to the exterior of the tool body; an external sleeve mounted to the exterior of the tool body for axial movement between a closed position in which the wash port is closed, and an open position in which the wash port is opened to allow cement surrounding the casing hanger to be washed out by pumping a fluid down the conduit; a set of threads on the interior of the external sleeve in engagement with the threads on the exterior of the internal sleeve; and means on the external sleeve and the tool body for preventing rotational movement of the external sleeve relative to the tool body, whereby rotation of the internal sleeve by the torque member causes the external sleeve to move axially.
- Assignee:
- Vetco Gray, Inc., Houston, TX (USA)
- Patent Number(s):
- US 4979566; A
- Application Number:
- PPN: US 7-499050
- OSTI ID:
- 5717229
- Country of Publication:
- United States
- Language:
- English
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