GX-GG-2B1-2A1a-3.2 (1/8) 3.2mm Optical Fiber Cable - China Suppliers and Factory for DTS, DAS, VSP Applications
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.
1. Deep/Ultra-Deep Wells (depth > 2500m): The 4kN breaking strength cannot withstand the total tension from the cable's own weight + tool weight, leading to high risk of cable breakage.
2. High-Deviation Wells (> 45°) / Long-Horizontal-Section Wells (horizontal section > 500m): The 3.2mm small-diameter cable has limited torsion and friction resistance; it is prone to tangling and wear in high-deviation/long-horizontal sections, and the minimum bending diameter (320mm) cannot adapt to high build-up rate trajectories.
3. Ultra-High Temperature Wells (bottomhole temperature > 150℃): Exceeding the rated temperature will cause aging of the cable protection layer and increased fiber signal attenuation, leading to monitoring failure.
4. Highly Corrosive Wells (high H₂S/CO₂ concentration): No special corrosion-resistant customization; the conventional 316L stainless steel tube cannot withstand highly corrosive media for a long time, making armor rusting likely.
5. Large-Bore Wells (wellbore diameter > 150mm): The small-diameter cable is prone to swinging and colliding with the wellbore in large-bore wells, resulting in insufficient protection performance and no adaptation advantage.
| 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 |
This cable system is designed for medium-shallow wells with a maximum depth of 2500m. Beyond this depth, the 4kN breaking strength is insufficient to withstand the combined tension of the cable's own weight and tool weight, creating a significant risk of cable breakage.
The system is suitable for low-deviation directional wells with a build-up section of 45° or less, and for short horizontal sections up to 500m. In higher-deviation or longer horizontal sections, the 3.2mm small-diameter cable is prone to tangling, wear, and its minimum bending diameter of 320mm may not accommodate high build-up rate wellbore trajectories.
The cable is rated for a maximum bottomhole temperature of 150℃. Exceeding this limit will cause aging of the cable's protective layer and increased fiber optic signal attenuation, ultimately resulting in monitoring failure. It is therefore not recommended for ultra-high temperature well environments.
No. The standard cable uses conventional 316L stainless steel tubing, which is not designed for highly corrosive environments. In wells with high concentrations of H₂S or CO₂, the armor is at risk of rusting over time, and no special corrosion-resistant customization is offered for this standard product.
The cable contains 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 well-suited for a broad range of downhole monitoring applications in shallow oil & gas wells and coalbed methane wells.
The cable's 3.2mm outer diameter is designed for wellbores with a diameter of 80mm or greater, including φ73mm and φ89mm thin-walled cased wells. In large-bore wells exceeding 150mm in diameter, the cable may swing and collide with the wellbore wall, reducing protection performance and eliminating the advantage of the small-diameter design.