Modulate the flow of drilling fluid with the Compass Stepper Pulser. This power efficient system provides more than 420 downhole hours and offers the widest flow range in the industry for any MWD Pulser (35gpm – 1100 gpm).

Ideal for high-gpm whipstock fluctuations without any damage to the pulser. Pulse real-time M/LWD data without any delay to enhance reservoir understanding, target well placement and maximize production

Compass Stepper Pulser is comprised of 3 main sections: Pulser Driver, Oil Fill, and Helix End

Compass Stepper Pulser allows mud-flow to be restricted creating a positive pulse pressure differential in standpipe pressure. It features strong signal amplitude and advanced noise cancellation processing, allowing clear detection at greater depths without interference


Min Flow Rate 35 gpm (2.2 L/sec) in water
Max Flow Rate 1,100 gpm (69 L/sec) in water
Max Operating Temperature 175° C (350° F)
Max Hydrostatic Pressure 20,000 psi (137.9 MPa)F)
Operating Voltage 20–29V
Nominal Current 4mA
Shock 1,000 g / 0.5 millisecond
Vibration 25g RMS 30-500 Hz random
30g 50-300 Hz Sine
Mud Sand Content <1% recommended
Poppet Push Force 60-280 lbs


Inputs Power: 18-30VDC
Pulse: 0–5VDC
Outputs Flow Switch: 0-5VDC
Pulse Mode Limit 2A
Non-Pulsing Mode (quiescent) 4mA
Power Consumption 300-350 hours of continuous pulsing per
29V Lithium Battery Stick
Poppet Closing Force 60–280 lbs
Length and Weight
w/o Signal Shaft
64.5 in (1,638 mm) / 34 lbs (15.4 kg)
Length and Weight
w/ Signal Shaft
86.25 in (2,190 mm) / 44 lbs (19.9 kg)
Housing Diameter 1.875" is standard, but can be built in 1.75"
Housing Material BeCu
Temperature Rating -40 to 175°C Functional; 185°C Survivable
Pressure Rating 20,000 psi

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