Mechanism of Cuttings Removing at the Bottom Hole by Pulsed Jet

Vibration drilling technology induced by hydraulic pulse can assist the bit in breaking rock at deep formation. Simultaneously, pulsed jet generated promotes removal of cuttings from bottom hole. Nowadays, mechanism is not clear, which causes to accumulate hole and increases risk repeated cutting. In this paper, a pressure-flow rate fluctuation model established analyze characteristics Based on model, effects displacement, well depth, fluid viscosity, flow area tool feature instantaneous are discussed. The results show that pressure fluctuate When displacement changes 20 L/s 40 2000 m well, generates 4–9 0.1–0.5 MPa With increasing 2 cm2 4 cm2, amplitude decreases 72.5%, more than 60%. Combined with field water attenuation law hole, force acting under derived. It found improves mechanical state beneficial for tumbled off This research provides theoretical guidance cleaning