Schlumberger

WellWatcher BriteBlue Multimode DTS Fiber

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Greater efficiency and cost savings, less NPT, enhanced production management and recovery

WellWatcher BriteBlue and WellWatcher BriteBlue HT multimode DTS fibers provide a permanent in-well reservoir monitoring system. The optical fiber can be pumped through a conduit using Schlumberger patented techniques to provide a cost-effective DTS system suitable for high-volume applications. The conduit is hung from the surface across the interval of interest, and the temperature of the entire wellbore is monitored. 

Monitoring Accurate Fluid Contacts in Fractured Carbonate with Lower Opex and Less HSE Exposure

Distributed temperature sensing (DTS) using WellWatcher BriteBlue HT fiber is accurate to within 1 m of gradiomanometer surveys in a highly fractured carbonate reservoir in Oman. Read case study


Improved control of thermal recovery techniques

Available with temperature ratings up to 300 degC [572 degF], our optical fiber has been used extensively for monitoring production and injection wells in heavy oil thermal recovery operations in various parts of the world. For example, it is used in steam-assisted gravity drainage (SAGD) producer wells to ensure that the correct level of subcooling is maintained to avoid steam breakthrough from the injector above.

Immediate identification of flow anomalies

Downhole distributed temperature profiles can be monitored at the surface in real time; data can also be transmitted to multiple remote locations. Consequently, anomalies such as loss of tubing, casing, or cement integrity or malfunctioning gas lift valves can be immediately recognized and remedial actions planned. 

Enhanced resistance to hydrogen-induced degradation

Conventional DTS-fiber temperature ratings do not take into account the degradation of the fiber when it is exposed to high levels of hydrogen (e.g., in SAGD wells), especially at high temperatures. Schlumberger pioneered accelerated aging tests for optical fibers at high temperatures. The fiber resulting from this research demonstrated an almost 50-fold increase in light transmission, exceptional resistance to hydrogen, longer life, faster response times, and better spatial resolution.

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Using DTS to Improve the Efficiency of Thermal Recovery Operations

SAGD animation
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DTS Fiber Applications

  • Sand screen flow analysis
  • ICD reservoir flow analysis
  • Gas well flow analysis
  • Water injection monitoring
  • SAGD monitoring
  • Gas lift monitoring
  • Well integrity monitoring
  • Fracture height monitoring