Downhole Motor PDM Positive Displacement Mud Motor For Directional Horizontal Drilling
Product Details
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PDM Positive Displacement Mud Motor,Directional Drilling Downhole Mud Motor,Horizontal Drilling PDM Motor |
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Product Description
A downhole motor (also known as a positive displacement motor, PDM, or mud motor) is a downhole drilling tool that converts the hydraulic power of drilling fluid into mechanical power to rotate the drill bit. Unlike conventional rotary drilling where the entire drillstring rotates from the surface, the downhole motor rotates only the bit while the drillstring remains stationary — a mode known as "sliding drilling". This unique capability makes downhole motors essential for directional drilling, horizontal drilling, and performance drilling applications.
Our company offers a comprehensive range of downhole motors with model designations from LZ73 to LZ286, suitable for hole diameters from 88.9 mm (3½") to 660 mm (26"). We can also design and manufacture custom motors according to customer specifications.
How a Downhole Motor Works?
A downhole motor consists of three major assemblies, from top to bottom:
Bypass valve – Allows drilling fluid to bypass the motor when running in or pulling out of the hole. When fluid flow and pressure reach set values, the valve closes and directs fluid through the motor.
Power section (motor assembly) – The core component consisting of a stator (steel tube with elastomer lining) and a rotor (hardened steel screw). The stator has one more lobe than the rotor. As drilling fluid is pumped through, it creates hydraulic pressure that causes the rotor to precess and rotate within the stator, converting fluid power into mechanical torque and speed.
Transmission section (universal shaft) – Converts the planetary motion of the rotor into fixed-axis rotation, transmitting torque and speed to the drive shaft.
Drive shaft (bearing assembly) – Transmits rotational power to the drill bit while bearing axial and radial loads from drilling pressure.
The lobe configuration (e.g., 5:6, 7:8, 9:10) and number of stages determine the motor's torque, speed, and pressure drop characteristics-.
Key Features & Advantages
1. High Directional Accuracy
Downhole motors provide excellent control over wellbore trajectory, making them ideal for directional wells, horizontal wells, and cluster wells. They allow precise changes in wellbore direction according to design requirements-.
2. Increased Rate of Penetration (ROP)
By rotating the bit directly at the bottom of the hole, downhole motors deliver more power to the formation, significantly increasing penetration rates compared to conventional rotary drilling.
3. Reduced Casing Wear
When drilling in straight hole applications, the motor functions as a performance tool that minimises drillstring rotation, thereby reducing casing wear and extending well life.
4. Stable Torque Output
Our motors provide consistent torque during drilling, reducing bit bounce and vibration. This improves drilling efficiency, extends bit life, and enhances overall drilling quality.
5. Adaptability to Various Formations
From soft shales to hard abrasive formations, our downhole motors perform reliably across a wide range of drilling conditions.
6. Broad Operating Temperature Range
With high-temperature elastomers, our motors can operate at temperatures exceeding 150°C, meeting the requirements of deep wells, ultra deep wells, and high geothermal gradient areas.
Product Series – Downhole Motor Types
Our downhole motor product line includes the following specialised models:
|
Motor Type |
Description |
|
Bent Downhole Motor |
Features a bent angle on the universal shaft to fit the curvature of kick off. Available in both single-bent and double-bent configurations. |
|
Adjustable Bent Housing Motor |
The bent angle can be adjusted at the surface before running in hole, extending the kick-off range and providing operational flexibility. |
|
Extended Downhole Motor |
Based on standard motor design with additional stages to increase torque, enabling faster drilling. |
|
Hollow Rotor Downhole Motor |
Adopts a hollow rotor with different sizes of hard alloy jet nozzles to increase input flow rate and bit power. |
|
High Kick-Off Downhole Motor |
Special design achieves kick-off curvature up to 1°/m, with a short overall length and bend point close to the bit. |
|
Saturated Saltwater Mud Resistant Motor |
Features a special coating layer on the rotor with strong corrosion and wear resistance for extended operation in saturated saltwater mud. |
|
High Temperature Downhole Motor |
Uses excellent high-temperature rubber in the stator to achieve temperature resistance above 150°C. |
|
Sealed Transmission Shaft Motor |
Converts mud-sealed transmission shaft to oil-sealed design, improving thrust and radial bearing conditions for longer motor life. |
Technical Specifications – Complete Model Range
Small Series (Hole Size: 89–213 mm)
|
Model |
5LZ73×7.0 |
5LZ89×7.0 |
7LZ95×7.0 |
7LZ102×7.0 |
5LZ120×7.0 |
5LZ146×7.0IV |
|
Nominal OD (mm) |
73 |
89 |
95 |
102 |
120 |
146 |
|
Hole Size (mm) |
89–121 |
114–149 |
114–149 |
118–152 |
149–200 |
171–213 |
|
Flow Rate (l/s) |
1.5–5 |
3–8 |
8–13 |
8–13 |
9–15 |
15–22 |
|
Speed (rpm) |
120–260 |
100–260 |
80–200 |
80–200 |
95–250 |
120–180 |
|
Lobe Ratio |
5:6 |
5:6 |
7:8 |
7:8 |
5:6 |
5:6 |
|
Stages |
3 |
3 |
3 |
3 |
3 |
4 |
|
Working Torque (N·m) |
330 |
560 |
1,200 |
1,200 |
1,800 |
1,920 |
|
Max Torque (N·m) |
560 |
970 |
2,000 |
2,000 |
3,100 |
3,400 |
|
Output Power (kW) |
4–7.5 |
5.4–11.5 |
10–20.8 |
10–20.8 |
16.8–36 |
28–60 |
|
Length (mm) |
3,670 |
2,700 |
4,040 |
4,040 |
4,565 |
5,945 |
|
Weight (kg) |
85 |
85 |
145 |
150 |
270 |
440 |
Medium Series (Hole Size: 213–251 mm)
|
Model |
5LZ165×7.0IV |
5LZ165×7.0V |
5LZ172×7.0IV |
5LZ172×7.0V |
7LZ172×7.0VI |
|
Nominal OD (mm) |
165 |
165 |
172 |
172 |
172 |
|
Flow Rate (l/s) |
18–28 |
18–28 |
20–33 |
20–33 |
22–36 |
|
Speed (rpm) |
90–180 |
90–180 |
95–180 |
95–180 |
75–145 |
|
Lobe Ratio |
5:6 |
5:6 |
5:6 |
5:6 |
7:8 |
|
Stages |
4 |
5 |
4 |
5 |
6 |
|
Working Torque (N·m) |
4,200 |
5,500 |
5,200 |
6,500 |
7,600 |
|
Max Torque (N·m) |
7,300 |
9,600 |
9,100 |
11,300 |
13,300 |
|
Output Power (kW) |
41–74.3 |
52–93.5 |
49.2–88 |
62–110 |
80–152 |
|
Length (mm) |
6,685 |
7,580 |
6,550 |
7,450 |
8,050 |
|
Weight (kg) |
730 |
810 |
802 |
906 |
1,010 |
Large Series (Hole Size: 222–660 mm)
|
Model |
LZ185×7.0V |
5LZ197×7.0IV |
5LZ197×7.0V |
5LZ203×7.0IV |
5LZ203×7.0V |
5LZ216×7.0IV |
5LZ216×7.0V |
7LZ244×7.0IV |
5LZ286×7.0IV |
|
Nominal OD (mm) |
185 |
197 |
197 |
203 |
203 |
216 |
216 |
244 |
286 |
|
Hole Size (mm) |
222–251 |
251–311 |
251–311 |
251–311 |
251–311 |
311–394 |
311–394 |
311–445 |
375–660 |
|
Flow Rate (l/s) |
25–40 |
20–38 |
20–38 |
20–38 |
20–38 |
28–50 |
28–50 |
35–65 |
55–95 |
|
Speed (rpm) |
100–160 |
90–160 |
90–160 |
90–160 |
90–160 |
75–140 |
75–140 |
75–130 |
85–160 |
|
Lobe Ratio |
7:8 |
5:6 |
5:6 |
5:6 |
5:6 |
5:6 |
5:6 |
7:8 |
5:6 |
|
Working Torque (N·m) |
6,900 |
7,200 |
8,500 |
7,100 |
8,800 |
9,000 |
11,000 |
12,000 |
13,500 |
|
Max Torque (N·m) |
12,000 |
12,600 |
14,800 |
12,400 |
15,400 |
15,700 |
19,200 |
21,000 |
22,000 |
|
Length (mm) |
8,397 |
7,790 |
8,900 |
7,790 |
8,900 |
8,480 |
9,680 |
6,900 |
7,950 |
|
Weight (kg) |
1,070 |
1,135 |
1,215 |
1,280 |
1,345 |
1,470 |
1,620 |
1,950 |
2,320 |
Note: Connection threads vary by model (2⅜" TBG up to 7⅝" REG). Please contact us for specific thread configurations.
Downhole Motor Applications
Downhole motors are widely used across the oil and gas industry and beyond:
Oil & Gas Exploration and Development
Used for vertical wells, directional wells, horizontal wells, cluster wells, and extended-reach wells. Downhole motors enable precise wellbore trajectory control, improving oil and gas recovery rates.
Performance Drilling
In straight hole applications, downhole motors increase ROP and reduce casing wear by minimising drillstring rotation from the surface.
Workover and Well Intervention
Suitable for sidetracking, milling, underreaming, coring, and fishing operations.
Geothermal Exploration
Used for drilling geothermal wells, efficiently breaking rock to reduce drilling time and costs.
Coal Mine Drilling
Applied for gas drainage holes, water exploration holes, and geological exploration holes in underground coal mines.
Engineering Geological Survey
Drills through various formations to obtain geological samples and data for engineering design.
Why Choose Our Downhole Motors
Comprehensive range – Models from 73 mm to 286 mm nominal OD cover hole sizes from 3½" to 26".
High torque output – Extended power section options significantly increase torque and power.
Proven reliability – Designed and manufactured to industry standards with a service life exceeding 1,000 hours in demanding applications.
Advanced features – Adjustable bent housing, even-wall stator technology, and sealed transmission shafts extend motor life and improve performance.
Corrosion and wear resistance – Special chrome and tungsten carbide coating options for rotors ensure long-term operation in saturated saltwater mud.
High-temperature capability – Motors can operate at temperatures exceeding 150°C for deep and ultra-deep wells.
Frequently Asked Questions
Q: What is the difference between a downhole motor and a rotary steerable system (RSS)?
A downhole motor rotates the bit using drilling fluid power while the drillstring remains stationary. An RSS rotates the entire drillstring while steering. Downhole motors are more economical for most directional applications.
Q: How do I select the correct downhole motor for my well?
Selection depends on hole size, required torque and speed, flow rate available, well temperature, and whether directional or straight hole drilling is planned. Use our specification tables above or contact us for assistance.
Q: Can your downhole motors be used with oil-based muds?
Yes. Our motors are available with special elastomers and rotor coatings designed for aggressive oil-based muds, high temperatures, and briny environments.
Contact Us
For more information about our downhole motor product range, technical specifications, or to request a quotation, please contact Suntrise today. We provide custom design and manufacturing services to meet your specific drilling requirements.
Product Highlights
A downhole motor (also known as a positive displacement motor, PDM, or mud motor) is a downhole drilling tool that converts the hydraulic power of drilling fluid into mechanical power to rotate the drill bit. Unlike conventional rotary drilling where the entire drillstring rotates from the surface, ...
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