Gripper block for coiled tubing injector with variable tubing size capability
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United States of America Patent
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May 17, 2005
Grant Date -
Sep 30, 2004
app pub date -
Mar 25, 2003
filing date -
Mar 25, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An improved V-style gripper block to better accommodate a variable outer diameter material (e.g. cable, plastic, wire, or pipe). The gripper block comprises a block body being connectable to a gripper chain in an injector apparatus, a gripper plate having arcuate and/or angled gripping surfaces for engaging tubing of various outer diameters, and a flex layer disposed between the gripper plate and the block body to allow the gripping surface of the gripper plate to move relative to the block body to which it is attached. This relative movement allows the gripping surface of the gripper block to rapidly conform to changes in the outer diameter of coiled tubing. In various embodiments, the flex layer may be formed of elastomeric materials including natural or synthetic rubber; an encapsulated gel or liquid within a flexible membrane; or mechanical means such as springs.
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