Rotating blowout preventor for drilling rig
A rotating blowout preventor is described comprising: a rubber stripper assembly having a flange affixed at the upper end thereof and a stripper rubber affixed at the lower end thereof, the stripper assembly and the flange are rotatable respective to the main body, the flange has opposed faces; means on the main body forming a upwardly directed annular bearing surface within the axial passageway which is perpendicularly oriented respective to the longitudinal axis of the rotating blowout preventor; a lateral outlet underlying the annular bearing surface for flow of fluid from the passageway to a location removed from the main body; the lower annular face of the flange extends outwardly of the stripper rubber and bears against the annular bearing surface with the stripper rubber underlying the flange and spaced from the interior wall surface of the axial passageway; a retaining collar received within the upper marginal end of the axial passageway; a stinger connected to the flange; and means for removably affixing the collar respective to the main body; whereby, the collar can be removed from the main body, and the rotating parts of the head can be removed from the main body to thereby enable field repairs to be carried out.
- Assignee:
- NOV; NOV-89-066093; EDB-89-113125
- Patent Number(s):
- US 4825938
- OSTI ID:
- 5965856
- Country of Publication:
- United States
- Language:
- English
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