Coiled tubing is a continuous length of steel tubing stored and transported on a reel. Unlike jointed pipe, it can be run into and retrieved from a well without repeatedly making and breaking threaded connections.
The continuous string can support circulation while moving in the well, making coiled tubing useful for intervention, cleanout, stimulation and selected drilling or completion operations.
- Continuous tubing supplied on a reel
- Rapid deployment compared with jointed tubulars
- Circulation during many intervention operations
- Configuration matched to injector and reel limits
A coiled-tubing enquiry should state outside diameter, wall profile, grade or strength design, continuous length and operating envelope. Feasible length depends on tubing mass, reel geometry and transport restrictions.
Repeated bending over the reel and guide arch contributes to fatigue consumption. Pressure cycles, ovality, weld quality, corrosion and fluid chemistry also influence the service plan.
The final request should define the tubing string, reel interface, end termination, testing, documentation, packing and destination as one deliverable.