Coiled Tubing Connectors

Selecting the appropriate connector is generally dependent on the application and operator preference.
Grapple connector
Setscrew/dimple connector
Roll-on connector

1.Roll-On Connector
The roll-on connector attaches to the internal diameter of the CT and is held in place by crimping the CT around a connector profile with a special crimping tool. However, the roll-on connector poses a significant obstruction to fluids, darts or balls pumped through the CT. In special applications where an extremely slim bottomhole assembly is required, and where low torque and tensile strength values are required, the roll-on connector may be considered a practical alternative to the grapple and setscrew connector.

2.Grapple Connector
Grapple connectors use a wedge or slip collar arrangement to lock the CT string inside the connector housing. A wide variety of designs are available including single- and bidirectional slip assemblies. A double acting bi-directional design is typically recommended since the CT connector may be exposed to significant compression forces in both directions, i.e., tension/compression.

3.Setscrew/Dimple Connector
The Setscrew Connector is attached to the CT by setscrews engaging in preformed dimples.
A dimpling tool is used to place the dimples in the same pattern as formed by the screws on the connector. The setscrew connector attaches to the outside diameter of the CT, and therefore, interferes less with the internal flow path of the tubing.