China Suppliers Factory 11×11 mm Fiber Optic Cable for Well Logging, High-Speed Data Transmission and Monitoring
1. Conventional Oil & Gas Wells
Adaptable Well Types: Medium-deep vertical wells (depth ≤ 4000m), medium-deviation directional wells (≤ 60°), medium-deep cased wells, medium-deep open-hole wells, medium-temperature high-temperature exploration wells
Typical Applications: Medium-deep oil & gas exploration wells, production dynamic monitoring, cased well completion monitoring, open-hole exploration logging, medium-temperature high-temperature well monitoring.
2. Unconventional Oil & Gas Wells
Adaptable Well Types: Shale gas long-radius horizontal wells (horizontal section ≤ 1000m), medium-deep coalbed methane (CBM) wells, medium-deep tight oil & gas wells, medium-temperature high-temperature unconventional wells
Typical Applications: Shale gas horizontal well fracturing monitoring, CBM well production monitoring, tight reservoir dynamic monitoring, permanent downhole monitoring in medium-temperature high-temperature zones.
3. Other Exploration & Engineering Wells
Adaptable Well Types: Medium-deep medium-temperature high-temperature geothermal wells (≤ 200℃), hydrogeological exploration wells, underground coal mine monitoring wells, medium-deep water injection wells.
Typical Applications: Medium-temperature high-temperature geothermal resource monitoring, groundwater hydrological data collection, coal mine underground gas monitoring, water injection profile monitoring.
Wells deeper than 4000m: 10kN breaking strength cannot support total tension of cable weight + logging tool weight, high risk of cable breakage.
High-deviation wells (> 60°) / short-radius horizontal wells: Insufficient torsion and friction resistance; minimum bending diameter cannot match high-build trajectories, easily causing fiber breakage and signal failure.
Ultra-high temperature wells (> 200℃): Exceeds rated temperature, causing insulation aging, increased fiber attenuation, and monitoring failure.
Severe corrosive wells (high H₂S/CO₂ concentration): Standard stainless steel cannot resist long-term severe corrosion, leading to armor rust and fiber damage.
Ultra-high pressure wells (pressure > 140MPa): Exceeds rated pressure resistance, risking seal failure, structural damage, and safety hazards.
| Parameter | Specification | Applicable Well Condition | Typical Well Type |
| Fiber Configuration | 2 single-mode (B1) + 2 multi-mode (A1a) fibers, 11×11mm square cross-section, stainless steel fiber unit tube | DTS/DAS optical signal transmission, bottomhole temperature ≤200℃, fiber reserve length >3‰, suitable for medium-deep, medium-high temperature downhole environment (≤4000m), good stability in small wellbores | Medium-deep conventional oil & gas wells (≤4000m), shale gas long-radius horizontal wells, medium-deep coalbed methane wells |
| Temperature Resistance | Rated temperature 200℃ (392℉), high-temperature resistant insulation layer, stable performance under 200℃ long-term operation, compatible with square-section structure | Medium-high temperature downhole environment, bottomhole temperature ≤200℃, no ultra-high temperature (>200℃) environment, medium-deep well (≤4000m) long-term monitoring | Medium-deep oil & gas wells (≤4000m), medium-high temperature geothermal wells (≤200℃), medium-temperature unconventional oil & gas wells |
| Protection & Cross-Section | 11×11mm square cross-section (stable, anti-tangling), stainless steel outer tube, FEP encapsulation, excellent wear resistance, corrosion resistance and pressure resistance | Wellbore diameter ≥90mm, small wellbore space, moderate wellbore wear, corrosive formation fluid (H₂S/CO₂/Cl⁻), rated pressure ≤140MPa, medium-deep downhole environment (≤4000m) | Medium-deep cased wells (≤4000m), medium-deep open-hole wells, small-diameter exploration wells, medium-high temperature geothermal wells |
| Mechanical Performance | Breaking strength 10kN, maximum working tension 5kN (1:2 safety factor), excellent stability (square cross-section advantage), good flexibility and anti-wear performance, fully medium-deep well (≤4000m) tension requirements | Well depth ≤4000m, build-up section ≤60°, horizontal section ≤1000m (long radius), no sudden dogleg severity, medium downhole friction and tension conditions | Medium-deep vertical wells (≤4000m), medium-deviation directional wells, shale gas long-radius horizontal wells, medium-deep coalbed methane development wells |
This system is designed for wells with a maximum depth of 4000m. Beyond this depth, the 10kN breaking strength is insufficient to support the combined weight of the cable and logging tools, significantly increasing the risk of cable breakage.
The cable is suitable for medium-deviation directional wells with inclination up to 60° and shale gas long-radius horizontal wells with a horizontal section not exceeding 1000m. It is strictly inapplicable for wells with deviation exceeding 60° or short-radius horizontal configurations due to insufficient torsion and bending resistance.
The cable is rated for a maximum continuous operating temperature of 200℃ (392℉). It is not suitable for ultra-high temperature environments exceeding 200℃, as higher temperatures may cause insulation aging, increased fiber attenuation, and ultimately monitoring failure.
The cable features stainless steel outer tubing and FEP encapsulation, providing good resistance to moderate corrosive environments including H₂S, CO₂, and Cl⁻ formation fluids. However, it is not recommended for severe corrosive conditions with high concentrations of H₂S or CO₂, where prolonged exposure can cause armor rust and fiber damage.
The cable incorporates 2 single-mode fibers (B1) and 2 multi-mode fibers (A1a) within an 11×11mm square cross-section stainless steel fiber unit tube. This configuration supports both Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) applications, covering production monitoring, fracturing monitoring, and long-term permanent downhole monitoring.
The cable is rated to a maximum pressure of 140MPa. Installations exceeding this threshold risk seal failure and structural damage. For wellbore compatibility, a minimum wellbore diameter of 90mm is recommended to ensure adequate clearance for the 11×11mm square cross-section cable during deployment and retrieval.