Masted coiled tubing units feature a mast that conveys the injector up and down and side-to-side over the well, simplifying the rig-in process, adding a significant measure of safety, speeding the process and removing the expense of the crane. 

Features

Masted coiled tubing units are utilized for different types of intervention, including cleanouts, plug milling, setting tools, fracturing, and are especially adept at well completions requiring multiple perforations and fracturing of the zones. With a masted CTU, the time consuming process of using a crane to lift the injector head from the back of the CTU while rigging into the wellhead is avoided. Safety is significantly improved in windy conditions when compared to a conventional unit.

Source - https://stewartandstevenson.com/markets/oil-gas/well-intervention-coiled-tubing/coiled-tubing-units-masted

Stewart & Stevenson

Stewart & Stevenson, founded in Houston, Texas in 1902, is a manufacturer and distributor of products and services for the oil and gas, marine, construction, power generation, transportation, mining and agricultural industries. We serve domestic and global markets with equipment, rental solutions, parts, and service through a strategic network of sales and service centers in domestic and international locations. Stewart & Stevenson has operated as a subsidiary of Kirby Corporation since September 2017.