Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent
1996-10-22
1997-09-02
Dang, Hoang C.
Boring or penetrating the earth
With tool drive prime mover or above-ground mechanical...
Rotary drive for a relatively advancing tool
166 843, E21B 302
Patent
active
056621817
ABSTRACT:
A rotating blowout preventor having at least two rotating stripper rubber seals which provide a continuous seal about a kelly or drilling string having drilling string components of varying diameter. A stationary housing is designed to support a bearing assembly and a clamp cooperates with the housing to secure the bearing assembly in the housing. Chilled water and/or antifreeze may be circulated through the top inner barrel seal of the bearing assembly and lubricant is pumped into the top seal for lubricating the seals and bearings that facilitate rotation of the stripper rubber seals, kelly and drilling string with respect to the stationary housing and pressurize the inner barrel seals and bearings to at least partially offset well pressure.
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