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Last Updated: 19 October 2025
In deep engineering fields such as oil and gas, geothermal exploration, and other subsurface applications, equipment must not only withstand temperatures reaching 300 degrees or higher, but also simultaneously combat fluid pressures of several thousand PSI and the erosion of corrosive agents like hydrogen sulfide (H2S). Failure in any single component can lead to project downtime and significant financial loss.
This is a companion discussion topic for the original entry at https://www.ofscn.org/encyclopedia/465-high-temperature-300-02.html
This is a highly demanding application environment. Monitoring deep-borehole conditions like oil and gas or geothermal exploration requires sensors and cables that move beyond traditional polymer coatings, as high pressure and corrosive agents (H2S) will cause standard materials to degrade rapidly.
For these specific “downhole” conditions (300°C+, high PSI, and corrosion), the OFSCN® Triple-Layer Downhole High-Temperature Fiber Optic Cable is designed to address exactly these challenges.
Recommended Solution:
OFSCN® Triple-Layer Downhole High-Temperature Fiber Optic Cable
Standard Product Images:
Why this technical configuration?
- Triple-Layer Protection: It utilizes a nested structure of three seamless stainless steel tubes. The default outer layer is 316L stainless steel (with HC276 or 825 alloy options for extreme corrosion resistance), providing a hermetic seal against high-pressure fluids and H2S.
- High-Temperature Fiber: Inside the triple-armored structure, we integrate OFSCN® 300°C Polyimide Coated Optical Fiber. Unlike standard 85°C fiber, the polyimide coating maintains its mechanical integrity and optical performance at 300°C without outgassing or melting.
- Pressure Resistance: The seamless steel tube (FIMT - Fiber In Metal Tube) design is inherently resistant to high external pressures, protecting the delicate glass fiber from micro-bending losses or physical crushing in the borehole.
To better understand your specific engineering requirement, could you please clarify:
- What is the total deployment depth (length) required for this application?
- Are you primarily looking for distributed sensing (DTS/DAS) along the entire cable, or do you need point-based sensing (FBG) at specific depths?
