The Coiled Tubing Unit (CTU) is an advanced well-intervention system that utilizes a continuous, flexible steel tubing string to perform a wide range of downhole operations without the need for a drilling rig. The unit consists of major components including the reel, injector head, pressure-control stack (BOP), high-pressure pumping system, nitrogen equipment, control cabin, and power pack, all integrated to ensure precise and safe operation.
CTU is deployed for various specialized tasks such as matrix and dissolution acidizing, wellbore cleanout and circulation, sand and scale removal, mechanical milling, light fishing operations, nitrogen lifting, coiled-tubing logging (CTL), reservoir stimulation, and underbalanced operations.
Key advantages of this technology include rapid mobilization, significantly lower operational costs compared to rig-based interventions, the ability to work in live wells, suitability for high-pressure/high-temperature (HP/HT) environments, and enhanced operational safety. Coiled tubing plays a vital role in production optimization, well maintenance, reducing downtime, and improving long-term well performance, making it a strategic asset in oil and gas field management.