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Abstract Horizontal well laterals exceeding 15,000 ft present a fundamental mechanical limitation for coiled tubing (CT) interventions: the inability to reliably reach total depth. Historically, this limitation has constrained well design, lateral length, and reduced stimulated reservoir volume. Conventional mitigation strategies such as upsizing CT or installing an extended reach tool (ERT) in the bottom hole assembly are constrained by wellbore geometry and operational logistics, yielding diminishing returns as lateral lengths extend. Consequently, jointed pipe interventions have been the default solution for reaching these depths, despite the higher operational complexity and cost. A split-string system is introduced to extend the operational reach of CT interventions in ultra-long laterals. During drillout operations, the lower section of CT is first deployed into the well. The mid-string ERT and auxiliary components are then installed, securely linking the upper and lower string sections. The mid-string ERT is activated as it enters the lateral, generating additional downhole friction reduction along the CT string, enabling faster intervention and greater depths. Operational procedures were developed to minimize surface rig-up time, ensure reliable conveyance, and maintain tool function across ultra-long laterals. Over a sixteen-month field campaign, the split-string system was deployed in more than 120 wells across multiple U.S. basins. In laterals exceeding 3 miles, deployment consistently improved lateral rate of penetration and increased maximum achievable depth. The net effect of the method was a measurable reduction in overall completion duration and cost, while simultaneously offering a safer, faster, and more efficient alternative to traditional jointed pipe operations. This paper presents a novel approach to overcoming extended-reach limitations in CT interventions by utilizing a split string system, demonstrating measurable improvements in lateral reach and operational speed in laterals exceeding 3 miles. Beyond the technical performance gains, the study explores the operational thresholds at which this technology delivers the greatest value, providing operators with a framework for when and where its deployment is most advantageous.