SPE-231347-MS: A Milestone in Multilateral Stimulation Technology
A landmark technical paper presented at the SPE/ICoTA Well Intervention Conference and Exhibition in The Woodlands, Texas, in March 2026 (SPE-231347-MS) documented the industry's first successful integration of an electrically actuated multilateral entry tool (eMLT) with direction and inclination (D&I) measurement capability, an electrical circulation valve (ECV), and a coiled tubing (CT) hydraulic tractor, enabling extended-reach stimulation across six lateral branches in a single coiled tubing run. The operation, executed by Saudi Aramco in collaboration with SLB in a complex multilateral well, represents a paradigm shift in the approach to multilateral well intervention. Historically, hydraulic-actuated coiled tubing toolstrings could access no more than one non-natural lateral per trip, a fundamental limitation that forced operators to perform multiple intervention runs-or accept incomplete stimulation coverage-in wells with three, four, or more lateral branches.
The key technical innovation documented in SPE-231347-MS was the elimination of the hydraulic isolation requirement between the CT tractor and the multilateral entry tool. In conventional hydraulic toolstring configurations, the tractor and multilateral tool shared a common hydraulic control pathway, creating operational conflicts that prevented independent, selective actuation of each component. The introduction of electrically actuated multilateral tools-specifically the acid-resistant eMLT with real-time D&I telemetry and the on-command ECV-decoupled tractor operation from lateral selection, enabling selective, targeted entry into each lateral branch without compromising tractor performance. This single-run, six-lateral stimulation operation demonstrated that electrically actuated coiled tubing assemblies can overcome the constraints that have historically limited multilateral well intervention efficiency and effectiveness, opening the door to more economical development of complex multilateral well architectures.
China Vigor Coiled Tubing Unit: The Surface Platform for Advanced Interventions
The operational success of electrified coiled tubing toolstrings depends fundamentally on a reliable, high-performance surface equipment platform capable of delivering precise depth control, consistent pulling and pushing forces, and stable pipe management throughout extended-duration intervention operations. China Vigor's Coiled Tubing Unit (CTU) incorporates an electro-hydraulic load-sensing closed-loop control system with constant tension management that ensures stable drum operation and neat, uniform pipe spooling-a critical prerequisite for the sub-meter depth accuracy demanded by multilateral lateral entry operations, where the window between lateral junctions may be only a few feet in measured depth. The injector head clamping system employs a multi-hydraulic cylinder pressure regulation and pressure-maintaining circuit design, providing the sustained grip integrity and operational safety margin necessary for extended-reach interventions where injector performance is the single most important factor determining mission success.
The China Vigor CTU product line spans five models catering to a comprehensive range of well intervention requirements: the LG180/38 (40,000 lbs continuous pull, 20,000 lbs continuous push), LG270/38 (60,000 lbs pull, 30,000 lbs push), LG360/50 (80,000 lbs pull, 40,000 lbs push), LG450/50 (100,000 lbs pull, 50,000 lbs push), and LG630/60 (140,000 lbs pull, 70,000 lbs push). Maximum operating speeds are rated at 200 ft/min for the three smaller models and 160 ft/min for the two larger configurations, reflecting the engineering trade-off between pulling capacity and operating speed inherent in hydraulic injector head design. The injector clamping blocks feature a quick-detachable structure that significantly reduces the time and labor required for clamping block installation and disassembly during routine maintenance and pipe size changeovers-an operational consideration that directly impacts rig-up and rig-down efficiency during multi-well intervention campaigns. China Vigor offers truck-mounted, skid-mounted, and trailer-mounted CTU configurations to accommodate diverse deployment scenarios, from land-based unconventional well pads with generous surface space to offshore platform environments where deck footprint and lifting capacity constrain equipment selection.
Industry Implications and Future Trajectory
The SPE-231347-MS case study carries significant implications for coiled tubing unit specification, procurement, and deployment strategies going forward. The integration of electrically actuated downhole tools with coiled tubing platforms creates new requirements for surface control system compatibility, real-time downhole data telemetry bandwidth, and electrical power management through the coiled tubing string. As the industry transitions from purely hydraulic toolstring architectures to hybrid and fully electric configurations, CTU manufacturers must ensure that their control architectures can accommodate both conventional hydraulic actuation and emerging electrical control paradigms-ideally within a single, unified control platform that minimizes operator training requirements and reduces the potential for human error during complex intervention operations.
Looking forward, the coiled tubing intervention market is expected to see continued expansion driven by three converging trends: increasing multilateral well complexity as operators seek to maximize reservoir contact per surface location, the growing economic imperative for cost-effective re-stimulation and remediation of mature wells, and the expanding application of coiled tubing technology in extended-reach drilling and completion operations where conventional jointed pipe is technically or economically unsuitable. China Vigor's coiled tubing unit portfolio is positioned to support these evolving operational requirements through ongoing investment in control system refinement, injector head technology advancement, and deployment configuration flexibility. The company's commitment to electro-hydraulic control philosophy and modular design principles provides a technology foundation inherently compatible with the industry's trajectory toward electrified, data-rich coiled tubing intervention workflows.
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