Subsea coiled tubing injector with pressure compensated roller assembly
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United States of America Patent
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-
May 30, 2006
Grant Date -
May 20, 2004
app pub date -
Nov 10, 2003
filing date -
Nov 12, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A tubing injector (10) includes a traction device (12) having opposed grippers (14) laterally moveable so as to move a respective chain link member (16) of an endless loop chain into gripping engagement with the coiled tubing. A drive motor (11) is provided for powering the endless loop chain, and a plurality of roller bearings (20) each act between a respective chain link member and a gripper. A pressure compensating device (30) subjects fluid in a fluid passageway in the roller bearing (20) to a fluid pressure functionally related to subsea pressure. The tubing injector may be used for injecting the coiled tubing subsea into a wellhead or into another flowline.
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