The KTK Energy Non-Magnetic UBHO (Universal Bottom Hole Orientation) Sub, also known as a muleshoe sub, is a critical directional drilling component used in modern Bottom Hole Assembly (BHA) configurations.
It is specifically engineered to provide a precise orientation reference point for downhole directional tools such as MWD (Measurement While Drilling) and gyro surveying systems, ensuring accurate wellbore trajectory control in directional and horizontal drilling operations.
Manufactured from high-performance non-magnetic alloy materials (P530 / P550 grade equivalent), the UBHO sub eliminates magnetic interference and guarantees reliable azimuth and inclination measurements in complex geological formations.
As a supplier + manufacturer hybrid, KTK Energy delivers API-aligned directional subs designed for global oilfield service companies operating in the Middle East, North America, Africa, and offshore drilling environments.
【Technical Specifications】
Standard Size Range
| Nominal Size | Connection Type | Application |
| 4 3/4″ | 3 1/2″ IF | Slim hole / muleshoe directional drilling |
| 6 1/2″ | 4 1/2″ IF | Standard directional drilling BHA |
| 8″ | 6 5/8″ REG | Large hole / deep directional wells |
Material & Engineering
- Material Type:Non-magnetic stainless steel alloy (P530 / P550 equivalent)
- Magnetic Permeability:μr ≤ 1.005 (anti-interference grade)
- Function Compatibility:MWD / LWD / Gyro tools
- Fluid Flow Design:Full circulation while tool is seated
- Landing Sleeve Type:Precision-machined orientation sleeve
Mechanical Configuration
- BHA Integration: Below non-magnetic drill collars
- Tool Design: Muleshoe-style orientation slot
- Operational Mode: Continuous mud circulation compatible
- Downhole Environment: High deviation, directional wells, HPHT conditions
【Key Features】
1. High-Precision Orientation System
Provides a stable “high-side” reference for accurate directional drilling control.
2. Non-Magnetic Alloy Construction
Manufactured using advanced non-magnetic steel to eliminate interference with MWD and gyro sensors.
3. Accurate Landing Sleeve Design
Ensures precise tool alignment between MWD tools and mud motor scribe line.
4. Full Mud Circulation Capability
Allows continuous drilling fluid flow even while directional tools are seated.
5. Robust Downhole Durability
Designed for high torque, vibration, and harsh formation conditions.
6. Seamless BHA Integration
Installed directly below non-magnetic drill collars for optimal directional performance.
【Applications】
The KTK Energy UBHO Directional Sub is widely used in:
Directional Drilling Operations
- Well trajectory steering
- Horizontal and extended reach wells (ERD)
- Geo-steering operations
MWD / LWD Tool Deployment
- Real-time directional survey systems
- Azimuth and inclination reference alignment
- Downhole telemetry tool positioning
Complex Formation Drilling
- Unstable shale formations
- High deviation wells
- HPHT drilling environments
BHA Assembly Systems
- Integration with mud motors
- Non-magnetic drill collar configurations
- Precision directional drilling setups
【Advantages】
High Directional Accuracy
Ensures precise wellbore steering through stable orientation reference.
Zero Magnetic Interference
Non-magnetic material guarantees reliable MWD and gyro readings.
Continuous Drilling Efficiency
Allows uninterrupted mud circulation during tool operation.
Improved Wellbore Control
Enhances trajectory stability in directional and horizontal drilling.
Reduced Survey Errors
Minimizes measurement distortion in high-sensitivity environments.
Global Field Proven Design
Widely used in international drilling projects across Middle East, Africa, and offshore basins.
Supplier + Manufacturer Capability (KTK Energy)
KTK Energy integrates engineering design, precision machining, and global supply chain support to deliver reliable UBHO subs for oilfield service companies.
【FAQ】
What is a Non-Magnetic UBHO Sub used for?
It is used to provide a precise orientation reference point for directional drilling tools such as MWD and gyro systems.
Why is UBHO sub made from non-magnetic material?
To eliminate magnetic interference and ensure accurate downhole survey measurements.
What is the difference between UBHO sub and a muleshoe sub?
UBHO subs allow continuous mud flow while tools are seated, while traditional muleshoe subs may require pump shutdown during operation.
Where is UBHO sub installed in BHA?
It is typically installed below the non-magnetic drill collar in the Bottom Hole Assembly.
Can UBHO sub be used in horizontal wells?
Yes, it is widely used in directional, horizontal, and extended reach drilling operations.