Top head drive assembly with axially movable quill
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United States of America Patent
Stats
-
Mar 28, 1989
Grant Date -
N/A
app pub date -
Apr 2, 1987
filing date -
Apr 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A top head drive assembly includes a tubular quill having a central passageway aligned with an axis. The quill is supported for rotation on a load beam included in the top head drive assembly such that the quill is movable along the axis through a range of travel sufficient to provide thread protection to the down hole tubulars during tubular handling operations. Splines drivingly connect the quill with a transmission such that the transmission is operative to rotate the quill throughout the range of travel of the quill along the axis. A blowout preventer valve is mounted in an upper part of the quill to move axially and rotationally with the quill in order to eliminate sliding or rotary seals between the blowout preventer valve and the drill string.
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