Iraq Well Logging Fiber Optic Technology

Fiber-optic technology is revolutionizing well logging in Iraq, enabling real-time, high-resolution monitoring of horizontal wells and complex reservoirs.Recent Implementation in Iraq

In June 2026, CNLC Iraq Branch, in collaboration with CNLC Huabei Branch, successfully completed the first fully autonomous coiled tubing fiber-optic logging operation at the AD-XXX well in the Ahdab Oilfield. This operation addressed a long-standing challenge: performing production logging in horizontal wells where conventional wireline PLT tools were ineffective. The operation was completed safely within one week, delivering high-quality data and closing a critical technology gap in horizontal well production logging .

Fiber-Optic Well Logging Technology

Fiber-optic well logging uses thin strands of glass or plastic fibers to transmit data as light signals, enabling distributed sensing along the entire wellbore. Unlike traditional single-point sensors, fiber optics provide continuous, real-time measurements of temperature, acoustic signals, and strain, offering a comprehensive view of well conditions . Key technologies include:

• Distributed Temperature Sensing (DTS): Measures temperature variations along the fiber to detect flow patterns, leaks, or thermal anomalies in real time .
• Distributed Acoustic Sensing (DAS): Captures acoustic vibrations along the wellbore to identify leaks, monitor cement integrity, and detect mechanical issues .
• Distributed Strain Sensing (DSS): Monitors deformation and stress in the wellbore, optimizing completion design and hydraulic fracture performance .

Advantages Over Conventional Logging

Fiber-optic systems provide several benefits compared to traditional methods:

• Real-time data acquisition: Eliminates delays associated with station-based measurements and memory tools .
• Full coverage: Monitors the entire logged interval, capturing events that single-point sensors may miss .
• Enhanced diagnostics: Enables precise localization of anomalies, improving well integrity assessment and production optimization .
• Operational efficiency: Reduces diagnostic time by over 85% and allows safer, autonomous operations in challenging horizontal wells .

Applications in Reservoir and Completion Optimization

Fiber-optic technology supports smart well operations by providing high-resolution monitoring for:

• Hydraulic fracture stimulation: Optimizing cluster efficiency and stage performance using real-time DAS, DTS, and DSS data .
• Reservoir surveillance: Continuous monitoring of tubing, casing, and reservoir integrity, including CO2 injection profiling and microseismic activity .
• Production logging: Accurate flow profiling in horizontal wells, enabling better decision-making for production optimization .

Conclusion

The adoption of fiber-optic well logging in Iraq represents a significant technological advancement, particularly for horizontal wells and complex reservoirs. By providing real-time, distributed measurements, fiber-optic systems enhance operational safety, improve diagnostic accuracy, and optimize production and completion strategies, marking a shift toward smart well management in the region .