What Is the Fiber Telling Us? – The DFOS Challenge

An interactive quiz designed to challenge participants to interpret real signals captured with Distributed Fiber Optic Sensing and test their knowledge of DFOS principles and applications. A dynamic and engaging session exploring just how much information can be revealed through a single optical fiber.

Session Moderators:  Eduardo Schnitzler, Petrobras;  Emilio Coutinho, Petrobras

This interactive round-table session explores how subsea fiber optic sensing technologies serve as a catalyst for advanced well management and dynamic flow control. Participants will discuss how integrating continuous, high-resolution downhole data (DTS, DAS, and DSS) with modern intelligent completions unlocks the true potential of proactive reservoir management.

The discussion will focus on converting real-time diagnostic insights into precise operating actions—such as active interval control, valve adjustments, and inflow customization. By focusing on these actionable outcomes, the session highlights how advanced flow control powered by fiber can maximize production efficiency, optimize drainage strategies, and ultimately increase the recovery factor across complex subsea assets.

Session Chairs:  Cícero Martelli, UTFPR, Marco Fernandes, Shell

This session reviews subsea deployment architectures that enable permanent fiber optic sensing, emphasizing the practical constraints. Topics include connectivity options, power and communications capacity, wet- and dry-mate interfaces, and subsea hardware integration. Discussion address reliability and availability targets, maintainability, and intervention philosophies, including how these requirements shape design tradeoffs and lifecycle operability. Contributions are encouraged on qualification approaches, interface management, and field-proven mitigations. Case studies documenting installation experience, constraints encountered, and lessons learned that improve repeatable deployment are strongly encouraged.

Presentations:

• Leveraging Existing Subsea Fiber for Simultaneous DAS and DTS: Real-Time Detection and Classification for Acoustic and Thermal Monitoring
  Guilherme Weber, Immer Messen

• Marinized DAS: Accessing the Ocean Depths
  David Hill, Sintela Ltd

• DC/FO Unified infrastructure for All-Electric Subsea Control and DAS Monitoring 
  Ronan Michel, ASN

Session Chairs:  Pavel Nazarenko, Baker Hughes; Bahareh Ganji, Equinor

This session addresses the well and completion engineering decisions required to include permanent fiber in the earliest design stages. Topics include selection of installation concepts, mechanical and pressure-barrier interfaces, equipment qualification, compatibility with completion hardware, and implications for well integrity. The session also examines lifecycle considerations such as intervention readiness, repair strategy, and abandonment impacts, with attention to standardization opportunities that improve repeatability and reduce cost. Contributions should emphasize practical design choices, qualification evidence, and how requirements are translated into specifications and execution plans for subsea developments.

Presentations:

• Fiber Optics–Enabled Diagnostics of Thermo-Mechanical Effects in Deepwater Injection Wells: A Numerical Case Study
  Luis Carlos de Sousa Junior, Petrobras

• Downhole Fiber Wetmate System Design and Qualification
  Chris Cassidy, SLB

• One-Trip Completion and Methods for Integrating a Full Suite of Fiber Optic Sensors
  Garth Naldrett, Weatherford

Session Chairs: Achref Achich, TotalEnergies; Saulo Aguiar; EXPRO

This session examines integrity surveillance and HSE-driven use cases enabled by fiber optic sensing and how they translate into operational actions. Focus areas include detection-to-verification workflows, event classification, and alarm management strategies that balance sensitivity with false-positive control. The session discusses how fiber-derived insights are embedded into well integrity processes, escalation paths, and response procedures, including integration with complementary measurements and verification methods. Contributions should highlight decision workflows, performance metrics, and lessons learned from deployment and operations, with case studies demonstrating improved confidence, faster response, and measurable risk reduction.

Presentations:

• Real-Time Automatic Wellbore Leak Detection Through Integrated DTS and Pressure Monitoring
  Mikhail Kaznacheev, SLB

• From Data to Action: Practical Uses of Distributed Fiber Optics in Operations
  Bahareh Ganji, Equinor

Session Chairs:  Pierpaolo Marchesini, bp;  Dmitry Kortukov, SLB

This session focuses on production and flow diagnostics use cases where fiber measurements support optimization decisions in subsea wells. Topics include flow profiling, allocation support, transient diagnostics, and indicators of sand, slugging, and instability, as well as how interpretation outputs are operationalized. The session addresses integration with well and network models, uncertainty handling, and decision pathways that convert diagnostics into operating actions such as setpoint adjustments and operating envelope refinement. Contributions are encouraged on workflows, validation approaches, and field results, including examples that quantify impact on production efficiency, uptime, and surveillance effectiveness.

Presentations:

• From Distributed Sensing to Real-Time Reservoir Intelligence: Lessons from a Field-Wide Offshore Deployment
  Shaktim Dutta, SLB

• Leveraging Distributed Fiber Optic Sensing for Production Profiling and Flow Diagnostics in Complex Wells
  Saulo José Pereira Aguiar, EXPRO

• Fiber-Enabled Production Surveillance and Real-Time Allocation Using Multiphysics DAS/DTS Analytics
  Peyman Moradi, Baker Hughes

Session Chairs:  Brian Seabrook, ExxonMobil;  WIlliam Alves, Halliburton

This session examines the transition toward all-electric subsea production systems, focusing on unified architectures that integrate electrification, fiber optic sensing, and active flow control. It covers electrification strategies, subsea power distribution, communication protocols, and interface standardization, enabling seamless integration of sensing, monitoring, and control functions. Special emphasis is given to the interaction between distributed fiber optic measurements (DTS/DAS) and flow control systems such as ICDs/AICDs and ICVs, including challenges related to calibration, data interpretation, and completion design impacts on performance.

The session also addresses system reliability, redundancy, and failure modes in fully electric environments, along with qualification and lifecycle considerations. Contributions are encouraged on integration challenges, workflows linking sensing to active flow management, and validation approaches, as well as field experiences demonstrating how these architectures enhance data availability, reduce intervention complexity, and improve reservoir management, production optimization, and overall system operability and scalability.

Presentations:

• Advancing Reservoir Performance Through an All-Electric Downhole Network Combining Sensors, Control Devices and Fiber Optics 
  Alan McLauchlan, Halliburton

Session Chairs:  Adriana Triques, Petrobras; Corinne Sagary,  Alcatel Submarine Networks

This session explores reservoir surveillance and seismic applications enabled by fiber, including DAS-VSP and 4D workflows, with emphasis on repeatability and decision impact. Topics include acquisition planning, processing and QC, interpretation methods, and integration of outputs into subsurface models to reduce uncertainty. The session highlights how fiber-enabled seismic and reservoir insights drive development planning, intervention selection, and performance management decisions. Contributions should emphasize end-to-end workflow design, quality metrics, uncertainty management, and examples demonstrating how results were translated into actionable subsurface decisions. Case studies showing operational integration and sustained program performance are encouraged.

Presentations:

• Mero PRM Project: Challenges and Perspectives of the Largest Permanent Seismic System
  Matheus Casagrande, Petrobras

• Building Confidence in Wireline DAS Measurements for Borehole Seismic Interpretation Through Geophone Validation in Deepwater Pre-Salt Exploration Wells
  Tiago Rossi, Petrobras