POSITIVE DISPLACEMENT
MOTOR
PDM
A POSITIVE DISPLACEMENT MOTOR (PDM) IS A DOWNHOLE HYDRAULIC DRILLING MOTOR THAT USES DRILLING FLUID FLOW AND PRESSURE TO GENERATE TORQUE AND ROTATION TO DRIVE THE DRILL BIT.
MAIN COMPONENTS:
- POWER SECTION (ROTOR AND STATOR): CONVERTS HYDRAULIC POWER OF THE DRILLING FLUID INTO MECHANICAL ACTION, GENERATING TORQUE AND ROTATION.
- BEARING SECTION: SUPPORTS AXIAL AND RADIAL LOADS WHILE TRANSMITTING ROTATIONAL FORCE TO THE DRILL BIT.
- USES DRILLING FLUID FLOW AND PRESSURE TO DRIVE THE DRILL BIT DIRECTLY DURING DRILLING OPERATIONS.
REGULAR MOTORS SIZES
| Metric Size | Imperial Size |
|---|---|
| 120mm | 4 ¾" |
| 172mm | 6 ¾" |
| 195mm | 7 11/16" |
| 210mm | 8 ¼" |
| 240mm | 9 ⅝" |
MOTORS WITH R-WALL SIZES
| Metric Size | Imperial Size |
|---|---|
| 95mm | 3 ¾" |
| 120mm | 4 ¾" |
| 172mm | 6 ¾" |