Back-Off Connector: Controlled Disconnect Solution for Fishing Operations
The Fishing Operation Disconnect Challenge
Traditional fishing methods face limitations:
⚠️ Irreversible engagement with stuck fish risking additional lost equipment
⚠️ Inability to disconnect safely if fishing tool becomes stuck
⚠️ Limited flexibility when initial fishing approach proves unsuccessful
⚠️ Potential for compounding losses when primary fishing tool cannot be released
Our back-off connector delivers:
✅ Controlled disconnect capability through left-hand thread mechanism
✅ Emergency release functionality when primary fishing tools fail
✅ Multiple engagement options for various fishing scenarios
✅ Proven reliability in critical fishing operations
Working Principle & Mechanical Design
Left-Hand Thread Disconnect Mechanism
| Component | Design Feature | Operational Advantage |
|---|---|---|
| Left-Hand Threads | Reverse rotation engagement | Allows disconnect while string is right-hand rotated |
| Shear Section | Calibrated shear capacity | Controlled release at predetermined torque |
| Sealing System | Dual elastomer seals | Maintains pressure integrity during operations |
| Connection Types | API standard interfaces | Compatible with fishing string components |
Technical Specifications
| Parameter | Specification |
|---|---|
| Size Range | 2-7/8" to 7-5/8" OD (standard sizes) |
| Torque Capacity | 10,000-40,000 ft-lbs (size dependent) |
| Release Mechanism | Left-hand rotation with controlled torque |
| Pressure Rating | 5,000psi / 10,000psi options |
| Materials | 4140HM steel, specialized heat treatment |
| Connections | API REG, IF, FH (standard and left-hand) |
| Shear Value | Adjustable 50-80% of connection torque |
Operational Advantages
Fishing Operation Safety
Controlled Release Capability:
Predictable disconnect at predetermined torque values
Prevents secondary fishing jobs by ensuring tool recovery
Emergency escape when fishing tool becomes stuck
Operational Flexibility:
Multiple retrieval attempts without tripping out of hole
Adaptable strategy based on downhole conditions
Compatibility with standard fishing tool strings
Economic Efficiency
Reduced Fishing Costs:
Eliminates multiple trips for fishing tool recovery
Minimizes rig time during complex fishing operations
Protects expensive tools through reliable recovery capability
Field Applications & Performance Data
Application Scenarios
Stuck Fishing Tool Recovery: Emergency release when overshots or spears become stuck
Complex Fishing Operations: Strategic disconnect for approach modification
Fragile Fish Recovery: Controlled engagement to prevent fish damage
Emergency Situations: Reliable disconnect in well control scenarios
Performance Metrics
✅ Release Reliability: 100% successful disconnect in field operations
✅ Operation Time: Average 2-hour saving per fishing operation
✅ Success Rate: 98% fishing tool recovery in stuck scenarios
✅ Safety: Zero incidents of uncontrolled release or failure
