Optical Fiber Logging Cable 3.2mm, 2 SM + 2 MM, DTS-DAS-DVS, China Suppliers & Factory
Applicable Well Types
1. Conventional Oil & Gas Wells
Adaptable Well Types: Medium-shallow vertical wells (depth ≤ 2500m), low-deviation directional wells (build-up section ≤ 45°), shallow cased wells (φ73mm/φ89mm thin-walled casing)
Typical Applications: Shallow oil & gas exploration wells, daily monitoring of conventional production wells, supplementary logging operations for small-diameter cased wells.
2. Unconventional Oil & Gas Wells
Adaptable Well Types: Shallow coalbed methane wells (depth ≤ 1500m), shallow shale gas vertical wells/short-horizontal-section horizontal wells (horizontal section ≤ 500m)
Typical Applications: Monitoring of shallow coalbed methane development wells, logging of shallow vertical wells in the exploration stage of shale gas.
3. Other Exploration & Engineering Wells
Adaptable Well Types: Shallow geothermal wells (bottomhole temperature ≤ 150℃, depth ≤ 2000m), hydrogeological exploration wells (small-diameter detection wells), small-diameter monitoring wells in underground coal mines
Typical Applications: Exploration and monitoring of medium-temperature geothermal resources, collection of groundwater hydrological data, monitoring of gas control in underground coal mines.
Strictly Inapplicable Scenarios
Selection Reference
| Parameter | Specification | Applicable Well Condition | Typical Well Type |
| Fiber Configuration | 2 single-mode (B1) + 2 multi-mode (A1a) | DTS/DAS signal transmission, bottomhole temp ≤150℃ | Shallow oil & gas wells, CBM wells |
| Temperature Resistance | Rated 150℃ | Medium-temperature, no ultra-high temp (>150℃) | Medium-shallow geothermal wells |
| Outer Diameter | 3.2mm, 316L stainless steel tube | Wellbore diameter ≥80mm, slight corrosion | Small-diameter cased wells |
| Mechanical Performance | Breaking strength 4kN, min bending 320mm | Well depth ≤2500m, build-up ≤45° | Low-deviation directional wells |
Frequently Asked Questions
Q What is the maximum well depth this fiber optic cable is rated for?
This cable is rated for well depths up to 2500m. Beyond this depth, the 4kN breaking strength is insufficient to support the combined weight of the cable and downhole tools, significantly increasing the risk of cable failure. For deep or ultra-deep wells exceeding 2500m, a higher-rated cable system should be selected.
Q Can this cable be used in horizontal wells with long lateral sections?
The cable is suitable for short horizontal sections up to 500m and well deviations up to 45°. For horizontal wells with longer lateral sections or higher deviation angles, the small 3.2mm diameter limits torsion and friction resistance, making the cable susceptible to tangling and abrasion. Its minimum bending diameter of 320mm also restricts use in high build-up rate trajectories.
Q What is the maximum bottomhole temperature this cable can withstand?
The cable is rated for a maximum bottomhole temperature of 150℃. Exceeding this threshold causes degradation of the cable's protective jacket and increased optical fiber signal attenuation, which can result in complete monitoring failure. It is not suitable for ultra-high temperature well environments above 150℃.
Q Is this cable suitable for wells with high H₂S or CO₂ concentrations?
No. This cable uses standard 316L stainless steel tubing without special corrosion-resistant customization. In wells with high concentrations of H₂S or CO₂, the armor is likely to rust and degrade over time. For highly corrosive environments, a specially engineered corrosion-resistant cable should be used.
Q What types of unconventional wells is this cable compatible with?
This cable is compatible with shallow coalbed methane (CBM) wells at depths up to 1500m, as well as shallow shale gas vertical wells and short horizontal-section wells with horizontal sections up to 500m. It is well-suited for monitoring CBM development wells and logging shallow vertical wells during the exploration stage of shale gas projects.
Q What fiber types are included and what monitoring applications do they support?
The cable includes 2 single-mode fibers (B1) and 2 multi-mode fibers (A1a). This configuration supports both Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) signal transmission, making it suitable for comprehensive downhole monitoring in shallow oil & gas wells, coalbed methane wells, geothermal wells, and hydrogeological exploration wells.