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Abstract With three-mile (15,840-ft) laterals becoming more common across North America, four-mile (21,120*ft) laterals are now a reality. Coiled tubing (CT) continues to be a preferred method for well completion, but the friction between the CT and the wellbore becomes a major obstacle. This paper investigates the complexities and solutions involved in using CT in four-mile lateral wells, highlighting the role of customized CT solutions to minimize operational risks and enhance overall field economics. A multidisciplinary approach was used to evaluate CT interventions in super lateral wells. The study involved engineering larger outer diameter (OD) CT strings with advanced wall thickness configurations and material grades. Skelp technologies were utilized to alter stiffness in critical string areas, optimizing weight distribution for enhanced reach and weight-on-bit. The use of vibration tools and chemical friction reducers are evaluated along with alternative options such as the use of CT stingers with specific geometries, the implementation of secondary vibration tools with stingers were modeled to assess their impact on improving operational efficiency in these wells. The study demonstrates that larger OD CT strings with enhanced wall thicknesses and materials improved weight-on-bit and CT accessibility in three-mile and four-mile laterals wells, despite surface equipment and road regulatory weight limitations. Advanced CT string designs paired with vibration tools generating at least ~3,000-lbf force and chemical friction reducers cut friction by 20–50%, achieving CT reach operational milestones. The CT design feasibility analysis was accomplished using typical job and friction parameters seen in post-job analysis from wells in the region, and the projected four-mile lateral wells surveys/completion, was fed into the string design methodology to produce record-breaking string profiles for 2.375-in and 2.625-in CT with ~33,000-ft in length, using custom-fit wall thicknesses makeups, specific D/t ratios and quench-and-temper grade materials. Also, tubing force sensitivity analysis comparing tailored operating techniques utilizing CT stingers with specific geometries and the implementation of additional vibration tools, are also modeled and quantified in the overall extended reach performance. The results of the study emphasize the need for innovative CT configurations and a shift in operational risk tolerance to enable cost-effective interventions in ultra-long laterals. This paper highlights the rapid demand growth for larger and longer CT strings to service super lateral wells. It evaluates custom-fit CT solutions that expand operational capacity, enabling the deployment of multipurpose CT configurations that can perform well across a variety of wellbore designs and target depths, including record-breaking four-mile lateral completions.