DOWN HOLE MOTORS

Description

Asahi supplies Down Hole Motors commonly used for directional drilling in coal and hard rock mining as well as civil construction. They are also used as an alternative to conventional deflection style drilling where wedges are used.

The Down Hole Motor is driven via fluid pumped into the motor, which then turns it into a mechanical rotary motion through the form of a rotor. This rotary motion is applied to a Drill Bit (either PCD, impregnated diamond) and attached to the end of the motor to cut into the formation being drilled.

The direction of the motor can be determined by a “bent sub”. These subs can be fitted to the DHM to adjust the “angle” of the motor and how fast it can turn within the hole.

Asahi stock bent sub’s in standard angles – 1 degree, 1 ½ degree and 1 ¼ degree.

Many of our mining products can be re-tipped, refurbished and repaired at our Sydney factory.

Tool Sizes

2 3/8

2 7/8 Becu

2 7/8 Steel

Diameter (inches) 2.375 2.875 2.875
Lobes (5-6) (4-5) (5-6)
Stages 2.5 3 4
Length (ft) 9 9.5 11
Weight (lbs) 140 160 180
Top Connection BW NW NW
Bit Connection BW NW NW
Make Up Torque (ft/lbs) 600 1200 1200
Bit Sizes (inches) 2 7/8 – 3 1/2 3 1/4 – 4 3 1/4 – 4
Max Weight on Bit 3500 6000 6000
Max Bit Pressure Drop (psi) 200 200 200
Minimum Flow Rate (gpm) 25 30 40
Maximum Flow Rate (gpm) 50 70 80
Recommended Flow Rate (gpm) 42 60 70
Bit Speed (rpm) 200 – 375 160 – 375 250 – 450
Pressure Drop at Max Torque (psi) 400 400 495
Max Operating Torque (ft/lbs) 130 190 225
Maximum Overpull (lbs) 12500 20000 20000