The pulser receives the signal from directional probe, by controlling the circulation area between main signal poppet and main orifice.
Through the electromagnetic mechanism and causes change of pressure of the mud flowing in the drilling column, thus achieving the purpose of transmitting signals.
MWD Piston Pulser Specifications
Signal Transmission: Positive mud pulse
Outer Diameter: Φ48mm (and Φ38mm option for slim hole size well)
Max. Operating Temperature: 150°C (175°C option)
Max. Pressure: 138MPa (20,000PSI) ; 172MPa (25000PSI) option
Flow Rate: 10~55 L/sec (160-900 GPM), Depend on size of drill collar
Sand Content: Less than 1% recommended
Mud Density: ≤2.2g/cm3 (≤18.3 PPG)
