INDEXING FOR COILED TUBING DRILLING RIG
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United States of America Patent
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Issued Date -
Apr 2, 2009
app pub date -
Sep 25, 2008
filing date -
Sep 28, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides a coiled tube drilling rig (1) for drilling boreholes. The rig includes a drum (2) mounted about a longitudinal axis (B-B) and adapted for receiving a length of semi-rigid tubing (4) wound onto the drum. An injector unit (10) is provided for deploying the tubing (4) along a tubing deployment axis (A-A) and into a borehole, the deployment axis (A-A) being generally orthogonal to and intersecting the drum rotation axis (B-B). An indexing guide (11), confines the tubing in a indexing zone, between a moveable tangential separation point (14) on the drum and the deployment axis (A-A), to a deployment plane (X). The plane being defined by the location of the deployment axis and the separation pint (14). The drum is configured to pivot with respect to the deployment plane around an axis (C-C) substantially collinear with said deployment axis (A-A).
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