Internal flush coupling for composite coiled tubing

A coiled tubing system, comprising:

• a first length of coiled tubing;
• a second length of coiled tubing;
• and
• a coiled tubing connector including a female adapter having a tapered internal thread with a negative flank for threaded engagement with an external surface of the coiled tubing, a frustoconical inner surface on the female adapter and spaced axially from the tapered internal thread, a male adapter having a frustoconical outer surface for compressing a portion of the coiled tubing into engagement with the frustoconical inner surface on the female adapter and an adapter connector for structurally interconnecting the female adapter and the male adapter.

A method of interconnecting a body to coiled tubing, comprising:

• providing a female adapter with a tapered internal thread;
• threading the female adapter to an end of the coiled tubing;
• compressing a portion of the coiled tubing between a frustoconical inner surface on the female adapter and a frustoconical outer surface on a male adapter;
• providing a fluid-tight seal between male adapter and a portion of the coiled tubing compressed between the frustoconical inner surface and the frustoconical outer surface;
• and
• interconnecting the male adapter and the female adapter.