Advancing Formation Potential: Coiled Tubing Telemetry Tool with Extended Reach Intervention for Complex Horizontal Wells Acid Stimulation

Abstract Horizontal and extended-reach wells are critical assets in maximizing reservoir contact and improving production outcomes. However, coiled tubing (CT) operations in these wells face consistent challenges in reaching total depth (TD) due to elevated frictional forces in horizontal sections and restrictions imposed by completion designs. These limitations are particularly pronounced in wells with narrow internal diameters, such as 2.441" re-entry guides and electrical submersible pump (ESP), where CT size is limited to 2.0" and tool conveyance becomes increasingly challenging. This paper presents a novel intervention methodology that integrates a telemetry-enabled bottomhole assembly (BHA) with a hydraulically actuated extended-reach tool (ERT) to overcome these constraints. The single-conductor telemetry system powers downhole sensors and delivers continuous annular and internal pressure data to surface, enabling real-time monitoring of tool performance and wellbore conditions. With this capability, the ERT is activated only in the open hole section, preventing premature rupture disc fatigue from axial vibrations, and enabling early identification of potential tool failures. Real-time pressure trend analysis provided early detection of tool fatigue, allowing confirmation of ERT activation and avoiding unnecessary pull-outs. The hydraulic pulses generated by the ERT effectively reduced frictional drag, extending CT reach into longer and complex laterals and improving coverage of acid stimulation treatments. Complementing this, chemical friction reducer (CFR) was strategically deployed to further lower resistance along the wellbore, especially in extended horizontal sections. The combined use of hydraulic and CFR methods proved essential in overcoming depth limitations and optimizing intervention outcomes. Moreover, continuous pressure trend analysis provided valuable insights into the dynamic behavior of hydraulic pulses, supporting the selection and configuration of the most effective ERT designs for complicated well conditions. The integration of downhole telemetry, hydraulically actuated ERTs, and targeted CFR significantly enhanced CT reliability and depth capability in constrained environments. This data-driven approach delivered measurable operational value, reducing non-productive time (NPT), enabling precise tool placement, and ensuring effective stimulation in challenging well geometries. Field deployment confirmed the methodology as a scalable and adaptable solution for complex CT interventions in extended-reach wells.