Wellhead seal probe
Patent
·
OSTI ID:5158370
This patent describes an oil wellhead isolation device. It comprises a hollow mandrel having a first end portion to receive a wellhead isolation nipple assembly, and an end portion fixedly secured to an upper body or vice; mandrel drive means adapted to selectively disperse mandrel relative to the housing, along a longitudinal thereof to move the mandrel into or out of a casing; sand mandrel drive means including a drive box adapted to be fixedly but removably secured to a respective oil well casing assembly near an upper end of the casing assembly; a displacement nut-and-screw assembly rotatably mounted within the housing in a coaxial arrangement with the mandrel and including an internally threaded sleeve complementary with an outer thread of the mandrel; seal means fixedly secured to the displacement nut assembly for rotation in common with the displacement nut mechanism, the seal means being complementary with the outer thread and being disposed between the displacement nut mechanism and the first end portion of the mandrel; and guide means for preventing relative rotation of the housing and the mandrel, while allowing relative axial movement between the two.
- Assignee:
- NOV; NOV-92-032006; EDB-92-114603
- Patent Number(s):
- US 5113936; A
- Application Number:
- PPN: US 7-695996
- OSTI ID:
- 5158370
- Country of Publication:
- United States
- Language:
- English
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