Subsea coiled tubing injector with pressure compensation
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United States of America Patent
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Jun 3, 2008
Grant Date -
Oct 13, 2005
app pub date -
Dec 9, 2003
filing date -
Dec 13, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A pressure compensated tubing injector for injecting coiled tubing into a subsea wellhead or flowline. A traction device including grippers carried on respective opposing chain loops provides gripping engagement with the coiled tubing to longitudinally move the coiled tubing. A plurality of sealed outboard bearing assemblies guide movement of the chain loops. A drive unit powers the chain loops and includes a sealed gear case. One or more pressure compensators are placed in communication with the sealed gear case and one or more of the bearing assemblies, to compensate for subsea pressure and prevent intrusion of seawater. The bearing assemblies may include self-contained pressure compensators.
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