CUSTOMIZE TO MEET YOUR NEEDS
Our company can customize a variety of different power of mud generator, rectifier power supply, hydraulic module, drilling overall program, precision instruments of precision parts processing
Bending stiffness: axial 800-1200N-m/° (adjustable)
Torque transfer: ≥4000N-m (no relative sliding)
Fatigue life: ISO 13679 CAL IV certification (simulated well conditions 2000 hours)
Product Details
System Overview
The Downhole Flexible Joint (DFJ) is the core articulating component of a directional drilling system, which is located at the key position of the drilling column assembly (usually close to the drill bit or guiding tool), and realizes precise control of the borehole trajectory through controllable elastic deformation. The device can provide a continuous slope rate of ±3°/m while maintaining the drilling pressure transfer efficiency, and is suitable for shale gas ultra-long horizontal section (>3000m) and large displacement wells (ERD) and other complex working conditions.
| Classification | Subitem | Technical Parameters/Description |
| Core Structure and Technical Features | ||
| 1.Multi-body Coupling Structure Design | Elastic Element | - Titanium alloy bellows (TC4 ELI, fatigue life >1×10⁶ cycles) - Nano-reinforced rubber bushing (Shore hardness 85A, temperature resistance 175℃) |
| Motion Mechanism | - Ball-hinged universal joint (swing angle ±15°) - Hydraulic compensation chamber (pressure balance range 0-70MPa) | |
| 2.Dynamic Performance Parameters | Bending Stiffness | Axial 800-1200N·m/° (adjustable) |
| Torque Transfer | ≥4000N·m (no relative sliding) | |
| Fatigue Life | ISO 13679 CAL IV certified (2000 hours under simulated well conditions) | |
| 3.Integrated Sensing System | Deformation Monitoring | - Fiber Bragg Grating (FBG) array (strain resolution 1με) - MEMS inertial unit (attitude angle accuracy 0.1°) |
| Working Condition Diagnosis | - Vibration spectrum analysis (0-500Hz bandwidth) - Wear particle online detection (inductive sensor) | |
| Key Technology Breakthroughs | Variable Stiffness Control | Shape Memory Alloy (SMA)-based active adjustment mechanism (response time <2s) |
| Fluid-structure Coupling Optimization | CFD-DEM joint simulation (maximum drag reduction rate 18%) | |
| Extreme Condition Sealing | - Metal/non-metal composite seal ring (leakage rate <0.1cc/min@150℃) - Self-compensating PTFE lip seal (35MPa differential pressure resistance) | |
| Typical Application Scenarios | Rotary Guidance System (RSS) | Collaborates with guide vanes for "geometric guidance + flexible push-to-recline" composite control. |
| Ultra-deep Well Drilling | Alleviates drill pipe fatigue in high dogleg sections (>10°/30m). | |
| Intelligent Completion | Serves as a buffer unit for downhole expansion joints (compensates for thermal deformation). | |
| Technical Challenges and Development Trends | Existing Bottlenecks | - Creep effect of elastic elements under high temperature (>200℃) - Material crack propagation due to high-frequency torsional vibration (>20Hz) |
| Innovation Direction | 4D printing of variable stiffness lattice structures |
CUSTOMIZE TO MEET YOUR NEEDS
Our company can customize a variety of different power of mud generator, rectifier power supply, hydraulic module, drilling overall program, precision instruments of precision parts processing
