Product Overview
Our heavy-duty motor head assembly serves as the load-bearing output unit for downhole drilling motors used in coiled tubing and workover operations. It transmits rotational torque and axial load from the power section to the bit or mill, while accommodating the eccentric motion of the motor power section. The assembly includes a rugged bearing stack, drive shaft, housing and connection subs. Precision machined from high-strength alloy steel, the bearing assembly is designed to handle the high thrust and radial loads generated during milling, drilling and fishing operations. Large bore allows circulation of drilling fluid through the motor to the bit. Sour service material options comply with NACE MR0175 standards.
Core Features & Benefits
- Reinforced bearing stack handles high thrust and radial loads
- Large bore allows unrestricted circulation through motor to bit
- Hardened drive shaft and housing resist wear in abrasive fluids
- Standard API thread connections for BHA integration
- NACE MR0175 compliant sour service materials available
- Custom thread and size configurations available
Technical Specifications
| Model | Tool OD | Bore ID | Connection | Length | Max Thrust Load | Max Torque |
|---|---|---|---|---|---|---|
| MHA-150 | 1.687" | 0.750" | 1" AMMT | 24" | 20,000 lbs | 400 ft-lbs |
| MHA-175 | 1.750" | 0.875" | 1" AMMT | 28" | 30,000 lbs | 600 ft-lbs |
| MHA-200 | 2.250" | 1.125" | 1 1/2" AMMT | 32" | 45,000 lbs | 950 ft-lbs |
Custom configurations available upon request.
Typical Applications
- Heavy-duty composite plug, cast iron plug milling via coiled tubing motors
- Casing window cutting and sidetracking requiring sustained high torque output
- Long-section cement plug removal and hard formation milling
- Sour well milling & drilling work under hydrogen sulfide corrosion conditions
- Fishing milling for stuck downhole hardware and debris
- Extended-reach horizontal well abrasive cleanout operations
- Workover drilling for multi-stage well stimulation preparation
Advantages Over Standard Light-Duty Motor Heads
- Reinforced bearing assembly accommodates larger axial load and torque, drastically reducing bearing burnout risk during heavy milling
- Modular maintenance design reduces replacement cost: reusable outer housing, only replace internal worn consumables
- Enhanced sealing system greatly improves reliability under high-sand circulating fluid environments
- Strong vibration damping reduces fatigue damage of upper tubing and adjacent downhole tools
- Suitable for continuous high-torque output milling and drilling programs
FAQ
Q: Can worn internal bearings be replaced on site?
A: Yes, the segmented housing can be disassembled on site for bearing replacement; the alloy outer housing can be reused for multiple service cycles.
Q: Are sour service variants available for high-sulfur reservoirs?
A: We supply NACE MR0175 / ISO 15156 certified sour service versions with full material test certificates for export.
Q: What sizes are available?
A: Standard tool OD from 1.687" to 2.875". Custom sizes and thread connections available upon request.
Q: What is the production lead time?
A: Standard models ship within 5-10 working days; customized motor head assemblies take 15-25 working days.
Get Custom Datasheet & Factory Quote
We manufacture full series downhole motor head assemblies with rigorous quality control and complete certification. Contact us with your size, torque and well requirements for detailed datasheet and competitive factory quotation.
