Components of Coil Tubing

Coil tubing provides a cost-effective and time-efficient alternative to conventional straight tubings, which need to be connected and disconnected in stands of 2 or 3 every time the string needs to be lowered for the well intervention. A coil tubing unit can do many well interventions without mobilizing a workover rig. The main components of a coil tubing unit are:

• Power Pack - Provides hydraulic power to operate the control unit and is either electrical or diesel-powered.

• Control Unit: This unit has all the necessary controls for operating the coil tubing while running in or pulling out of the well.

• Injector Head: A vital component that provides hydraulic systems to supply pushing and pulling capacity for running or retrieving the coil tubing into the well. The gripper blocks ensure the tubing is inserted in a live well against the wellbore pressure.

• Pressure Control System: Provide the required primary, secondary, and tertiary barriers to ensure well integrity and control during operations. The stripper/packer provides the primary barrier through the sealing mechanism, while the secondary and tertiary barriers are provided by a coil tubing BOP. CT BOP consists of pipe ram, slip ram, blind ram, and shear ram to ensure the required controls during normal and emergency situations.

• Coiled Tubing Reel: The Coil Tubing is stored in its reel. The reel's drive system is designed to keep the coil tubing in tension between the goose neck and the reel while running in or retrieving it from the well.