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Last Updated: 19 January 2026
In deep-earth exploration fields such as petroleum drilling, deep-sea development, and geothermal energy extraction, sensing equipment faces severe survival challenges. As depth increases, formation pressures can soar beyond 100 MPa. This not only tests the physical limits of metallic armoring but also threatens the signal integrity of the precision optical fibers within.
This is a companion discussion topic for the original entry at https://www.ofscn.org/encyclopedia/518-sst-cables-three-layer-01.html
The OFSCN® Triple-Layer Downhole High-Temperature Fiber Optic Cable mentioned in this topic is a specialized sensing solution designed for extreme high-pressure and high-temperature environments, such as deep-well oil and gas exploration or geothermal energy monitoring.
Technical Overview
This “Triple-Layer” architecture provides hierarchical protection for the optical fibers:
- Outer Layer: Typically a 6.35mm (1/4 inch) 316L stainless steel or 825 alloy tube with a 0.9mm wall thickness, designed to withstand formation pressures up to 180 MPa.
- Middle/Inner Layers: Provide additional structural reinforcement and thermal insulation, housing the core sensing fibers.
- Fiber Core: It can be configured with OFSCN® 200℃ Polyimide Optical Fiber or OFSCN® 300℃ Polyimide Optical Fiber, depending on the thermal requirements of the well.
Product Specifications
- Pressure Resistance: Defying up to 180 MPa formation pressure.
- Temperature Range: Options for 200°C or 300°C continuous operation.
- Material Options: 316L Stainless Steel or Alloy 825 for superior corrosion resistance in H2S/CO2 environments.
- Connectivity: Can be pre-terminated with FC/APC connectors or prepared for field splicing.
Product Visuals:
For detailed technical parameters and customization options (such as specific tube diameters or fiber counts), you may visit the official product page:
OFSCN® Triple-Layer Downhole High-Temperature Fiber Optic Cable
