Defying 180 MPa Formation Pressure: OFSCN® Triple-Layer Stainless Steel Seamless Tube Fiber Optic Cable — The "Fortified Armor" for Specialized Sensors

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.

The flagship Triple-Layer Stainless Steel Tube (SST/FIMT) fiber optic cable from Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) features a multi-layered nested protective structure. Engineered to withstand pressures up to 180 MPa, it serves as a robust protective barrier for specialized sensors in complex environments.

1. Addressing the 180 MPa Engineering Challenge: Safeguarding Precision Signals

In ultra-deep wells or seabed environments, fiber optic cables must endure extreme hydrostatic pressure and formation stress, which places stringent demands on signal transmission:

• Physical Integrity: In high-pressure environments, deformation in standard single or double-layer metal tubes can directly compress the internal fibers.
• Signal Consistency: Even microscopic physical deformations can induce micro-bending in the internal silica (SiO2) fibers. These micro-bends lead to signal attenuation or increased noise, compromising the data accuracy of Distributed Temperature Sensing (DTS) or Distributed Acoustic Sensing (DAS) systems.

The core design objective of the OFSCN® Triple-Layer SST Cable is to maximize mechanical protection through hierarchical redundancy, maintaining the fiber’s pristine state under 180 MPa to ensure high-fidelity data transmission.

2. "Tube-in-Tube-in-Tube": A Nested Mechanical Redundancy Design

The product utilizes a precision "Triple-Layer Nested Seamless Welding" process, prioritizing structural redundancy to achieve a superior safety margin:

1. Structural Breakdown and Functionality
   • Outer Tube (6.35 mm / 1/4 inch): Constructed from thick-walled 316L stainless steel or Alloy 825, this serves as the primary physical barrier, absorbing the bulk of formation pressure and mechanical impacts.
   • Intermediate Tube (4.0 mm): Acts as a mechanical buffer, further dampening and dispersing any stresses transmitted from the outer layer.
   • Inner Tube (3.0 mm): The core encapsulation layer, ensuring the SiO2 fibers remain in a stable environment regardless of complex external forces.
2. Mechanical Decoupling Advantages The nested configuration creates a degree of "mechanical decoupling" between the three metal tubes. When the outer layer experiences localized compression, the micro-gaps and independent structural integrity of the layers effectively cushion the deformation, minimizing external stress interference on the innermost sensing fibers.

3. Exceptional Parameters: Engineered for Harsh Environments

Beyond its outstanding pressure resistance, the OFSCN® Triple-Layer SST Cable adheres to the highest design standards across several key performance metrics:

• High Tensile Strength: With a theoretical breaking strength exceeding 11,000 N, the cable provides an ample safety reserve for vertical deployments spanning several kilometers, handling complex downhole maneuvers with ease.
• Tiered Temperature Management: The standard model supports temperatures up to 200°C. For more extreme conditions, a customized all-metal 300°C version is available, utilizing polyimide-coated fibers to enhance system stability in high-heat environments.
• Multi-Stage Gas Barrier: The triple-layered seamless metal walls form a formidable barrier that significantly retards the permeation of hydrogen and other deleterious gases, mitigating "hydrogen darkening" and extending the fiber's lifespan.

4. Typical Applications

• Integrated Deep Downhole Monitoring: Serves as a carrier for various distributed sensing systems in complex oil and gas wells, providing long-term physical protection.
• Deep-Sea Resource Exploration: Withstands ultra-high hydrostatic pressures to ensure stable signal backhaul in subsea or deep-ocean monitoring.
• Geothermal Energy Monitoring: Enables precise sensing of formation parameters in the high-temperature, high-pressure environments of geothermal wells.

5. Choose Beijing Dacheng Yongsheng (OFSCN®)

In high-stakes deep-earth exploration projects, reliability equals productivity. Beijing Dacheng Yongsheng Technology Co., Ltd. specializes in fiber optic safety solutions for extreme conditions. Our triple-layer SST cables undergo rigorous mechanical simulation and pressure testing, designed to provide a "Solid Shield" for your core sensing units.

Under the weight of 180 MPa, OFSCN® stands with you to protect the security of your data assets.

For more product specifications and engineering case studies, please visit:

• Official Website: https://www.ofscn.org
• Product Details: https://www.ofscn.org/sst-cables/three-layer.html

Beijing Dacheng Yongsheng Technology Co., Ltd. — Defying Pressure Limits, Building Fortified Armor.