GX-GG-2B1-2A1a-6.35 Optical Fiber Cable 6.35mm, 4 Fibers, China Suppliers, Factory for DTS & Real-Time Monitoring
Applicable Well Types
1. Conventional Oil & Gas Wells
Adaptable Well Types: Medium deep vertical wells (depth ≤ 4000m), medium deviation directional wells (build up section ≤ 60°), medium shallow cased wells (φ89mm/φ114mm casing), medium shallow open hole wells.
Typical Applications: Medium deep oil & gas exploration wells, dynamic monitoring of conventional production wells, cased well completion monitoring, open hole exploration logging.
2. Unconventional Oil & Gas Wells
Adaptable Well Types: Medium shallow coalbed methane (CBM) wells (depth ≤ 2500m), shale gas long radius horizontal wells (horizontal section ≤ 1000m), tight oil & gas development wells.
Typical Applications: Production monitoring of CBM development wells, shale gas horizontal well fracturing monitoring, tight reservoir dynamic monitoring, permanent monitoring of unconventional wells.
3. Other Exploration & Engineering Wells
Adaptable Well Types: Medium shallow geothermal wells (bottomhole temperature ≤ 150℃, depth ≤ 2500m), hydrogeological exploration wells, underground coal mine monitoring wells, medium shallow water injection wells.
Typical Applications: Medium temperature geothermal resource monitoring, groundwater hydrological data collection, coal mine underground gas monitoring, water injection profile monitoring.
Strictly Inapplicable Scenarios
1. Ultra deep wells (depth > 4000m): 10kN breaking strength cannot support total tension of cable weight + logging tool weight, high risk of cable breakage.
2. High deviation wells (> 60°) / short radius horizontal wells (build up rate > 12°/100ft): Insufficient torsion and friction resistance; minimum bending diameter (800mm) cannot match high build trajectories, easily causing fiber breakage and signal failure.
3. Ultra high temperature wells (bottomhole temperature > 150℃): Exceeds rated temperature, causing FEP insulation aging, increased fiber attenuation, and monitoring failure.
4. Severe corrosive wells (high H₂S/CO₂ concentration): Standard 316L/A825 stainless steel cannot resist long term severe corrosion, leading to armor rust and fiber damage.
5. Ultra high pressure wells (pressure > 140MPa): Exceeds rated pressure resistance, risking seal failure, structural damage, and safety hazards.
Selection Reference
| Parameter | Specification | Applicable Well Condition | Typical Well Type |
|---|---|---|---|
| Fiber Configuration | 2 single-mode (B1) + 2 multi-mode (A1a), 316L/A825 stainless steel fiber unit tube | DTS/DAS signal transmission, bottomhole temperature ≤150℃, no heavy mechanical load, fiber reserve length >3‰ | Conventional oil & gas wells, shale gas wells, coalbed methane wells |
| Temperature Resistance | Rated temperature 150℃ (302℉) | Medium-temperature working conditions, bottomhole temperature ≤150℃, no ultra-high temperature (>150℃) environment | Medium-deep conventional oil & gas wells, shallow geothermal wells, coal mine underground monitoring wells |
| Protection & Outer Diameter | Outer diameter 6.35mm±0.10mm, 316L/A825 stainless steel outer tube + FEP encapsulation, corrosion-resistant | Wellbore diameter ≥80mm, moderate wellbore wear, corrosive formation fluid (H₂S/CO₂/Cl⁻), rated pressure ≤100MPa | Medium-deep cased wells, open-hole wells, corrosive oil & gas wells |
| Mechanical Performance | Breaking strength 10kN, maximum working tension 5kN, minimum bending diameter 800mm, good flexibility and torsion resistance | Well depth ≤4000m, build-up section ≤60°, no sudden dogleg severity, horizontal section ≤1000m (long radius) | Medium-deep vertical wells, medium-deviation directional wells, long-radius horizontal wells |
Frequently Asked Questions
What is the maximum well depth this fiber optic cable is rated for?
This cable is rated for well depths up to 4000m. In ultra-deep wells exceeding 4000m, the 10kN breaking strength may be insufficient to support the combined tension of the cable weight and logging tool weight, posing a significant risk of cable breakage.
Can this cable be used in high-deviation or horizontal wells?
The cable is suitable for medium-deviation directional wells with a build-up section of 60° or less, and long-radius horizontal wells with a horizontal section up to 1000m. It is not recommended for high-deviation wells exceeding 60° or short-radius horizontal wells with a build-up rate greater than 12°/100ft, as the minimum bending diameter (800mm) cannot accommodate such tight trajectories.
What is the maximum bottomhole temperature this cable can withstand?
The cable has a rated maximum temperature of 150℃ (302℉). Environments exceeding this threshold can cause FEP insulation aging, increased fiber attenuation, and ultimately monitoring system failure. It is applicable for medium-temperature conditions such as shallow geothermal wells and medium-deep oil & gas wells within this temperature range.
Is this cable suitable for corrosive well environments with H₂S or CO₂?
The cable features a 316L/A825 stainless steel outer tube with FEP encapsulation, providing good resistance to moderate corrosive conditions including H₂S, CO₂, and Cl⁻ environments. However, it is not suitable for wells with severely high H₂S/CO₂ concentrations, as long-term severe corrosion can lead to armor rust and fiber damage.
What fiber types are included and what monitoring applications do they support?
The cable incorporates 2 single-mode fibers (B1) and 2 multi-mode fibers (A1a), housed in a 316L/A825 stainless steel fiber unit tube. This configuration supports both Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS), making it suitable for applications including production monitoring, fracturing monitoring, and permanent reservoir surveillance.
What unconventional well types can this cable be applied to?
This cable is well-suited for a range of unconventional applications including medium-shallow coalbed methane (CBM) wells (depth ≤ 2500m), shale gas long-radius horizontal wells (horizontal section ≤ 1000m), and tight oil & gas development wells. Typical uses include production monitoring, fracturing monitoring, and permanent downhole monitoring in these well types.