| 摘要 |
A coupling 10 for use with composite coiled tubing 12 connects the coiled tubing 12 to a tool or other tubing member. The coupling 10 may include a female coupling component 26 and a male coupling component 28, with a substantially flush internal bore through the coupling 10 concentric with the coiled tubing. The female component 26 may include a tapered, negative flank thread profile 32 for engagement with the coiled tubing 12, and preferably provides a fluid tight seal and axial joint strength substantially as strong as the coiled tubing 12. Another embodiment of the coupling 70 may include a smooth tapered inner surface 76 for bonding engagement with the coiled tubing 12. In addition, a double male flush joint adapter 80 may be used to connect multiple strings of composite coiled tubing 12 and may also provide a substantially flush internal joint.
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