The KTK Energy Fishing Bumper Sub is a high-performance mechanical downhole impact and displacement tool designed for fishing operations and stuck pipe recovery in oil & gas drilling.
It delivers controlled and repeated axial impacts to the drill string, helping to loosen differential sticking, mechanical sticking, and debris-related obstruction. When upward jarring is ineffective, the bumper sub allows controlled rotation and movement, enabling efficient disengagement and recovery of downhole fish.
In complex fishing operations, the tool can also be used with a mechanical internal cutter, providing a preset constant force to ensure stable cutting performance. During back-off operations, it compensates for the required upward stroke after tool disconnection, improving operational control.
KTK Energy designs this tool as part of a complete fishing & well intervention solution system, widely used in deep wells, directional drilling, and complex formation environments.
Key Features
1. Repeated Impact Delivery System
Provides controlled axial impacts to help free stuck pipe in challenging downhole conditions.
2. Rotation-Compatible Design
Allows rotation when jarring is insufficient, improving flexibility in fishing operations.
3. Stable Cutting Force Support
Works with internal cutters to maintain constant force for reliable cutting operations.
4. Back-Off Compensation Function
Compensates for upward stroke requirements during tool disconnection operations.
5. Simple Mechanical Structure
Fully mechanical design ensures high reliability in harsh downhole environments.
6. Full Size Range Availability
Compatible with multiple hole sizes from 3-3/8″ to 8″.
Technical Specifications
Available Sizes & Performance Parameters
| Size | OD | ID | Connection | Max Tensile Load | Tensile Yield | Torsional Limit | Torsional Yield | Stroke | Length |
| 3-3/8″ | 86 mm | 25.4 mm | NC23 | 340 kN | 610 kN | 3 kN·m | 5 kN·m | 500 mm | 1510 mm |
| 4-1/8″ | 105 mm | 31.8 mm | NC31 | 700 kN | 1100 kN | 5 kN·m | 10 kN·m | 700 mm | 1900 mm |
| 4-1/2″ | 114 mm | 31.8 mm | NC31 | 900 kN | 1620 kN | 6 kN·m | 11 kN·m | 700 mm | 1900 mm |
| 4-3/4″ | 121 mm | 38 mm | NC38 | 1100 kN | 1950 kN | 8 kN·m | 15 kN·m | 1000 mm | 2102 mm |
| 6-1/2″ | 165 mm | 50.8 mm | NC50 | 1400 kN | 2100 kN | 13 kN·m | 20 kN·m | 1400 mm | 2606 mm |
| 7″ | 178 mm | 50.8 mm | NC50 | 1450 kN | 2200 kN | 15 kN·m | 27 kN·m | 1400 mm | 2606 mm |
| 8″ | 203 mm | 70 mm | 6-5/8 REG | 1500 kN | 2400 kN | 20 kN·m | 35 kN·m | 1500 mm | 2729 mm |
Applications
The KTK Energy Fishing Bumper Sub is widely used in:
Oil & Gas Fishing Operations
- Stuck pipe recovery
- Fish disengagement operations
- Downhole obstruction removal
Well Intervention & Workover
- Fishing tool support operations
- Back-off and disconnection assistance
- Re-entry drilling support
Directional & Complex Wells
- Deep wells and extended reach drilling (ERD)
- High deviation well trajectories
- Unstable formation drilling
Cutting & Milling Operations
- Internal cutter support operations
- Controlled force cutting applications
Advantages
Improved Fishing Efficiency
Delivers repeated controlled impacts to enhance stuck pipe release success rate.
Enhanced Operational Flexibility
Supports both jarring and rotational operations depending on downhole conditions.
Reliable Mechanical Design
Fully mechanical structure ensures stable performance without hydraulic dependency.
Multi-Function Downhole Tool
Combines jarring, rotation, and force compensation in one tool.
Reduced Non-Productive Time (NPT)
Improves fishing success rate and reduces costly drilling downtime.
Supplier + Manufacturer Hybrid (KTK Energy)
KTK Energy integrates engineering design, manufacturing capability, and global supply chain support to deliver high-reliability fishing tools for international oilfield service companies.
FAQ
What is a fishing bumper sub used for?
A fishing bumper sub is used in oil & gas drilling to deliver repeated impacts to the drill string for freeing stuck pipe and assisting fishing operations.
How does a bumper sub work?
It stores mechanical energy and delivers controlled axial movement and impact to help loosen stuck downhole tools.
What is the difference between a bumper sub and a drilling jar?
A bumper sub provides controlled stroke and impact with rotation capability, while a drilling jar delivers stronger single-direction jarring impact.
Can it be used with internal cutters?
Yes, KTK Energy bumper sub can work with mechanical internal cutters to provide stable cutting force during operations.
Is it suitable for directional drilling?
Yes, it is widely used in directional, horizontal, and complex well environments.