Numerical Simulation And Experimental Study On A Novel Friction Reduction Tool With Hydraulic Pulsed Jet

Friction reduction in extended reach wells and horizontal wells can be critical to enable the transfer of weight to the drill bit.Due to factors such as large contact area between drilling pipe and borehole,excessive friction can limit the driller’s ability to maintain tool face and to get weight to the bit,thus limiting the depth and accuracy of the well.Based on hydraulic pulsed jet technique and axial vibration friction reduction technology,a new friction reduction tool using hydraulic pulsed pressure to generate drill pipe’s axial vibration is developed.Its friction reduction mechanism and operating principle are introduced.Two different friction reduction tools with hydraulic pulsed jet are designed and manufactured.The working characteristics of the two tools are studied through CFD numerical simulation and laboratory test.Through theoretical analysis,numerical simulation and lab test,the effect of inlet flow rate on the tool’s pulsed pressure frequency,pressure fluctuation amplitude,pressure drop,axial vibration displacement,etc.are obtained.Significant factors including number of impeller blades,through-hole area of pressure-bearing plate are analyzed.Also,the attenuation of hydraulic pulsed pressure fluctuation is studied.The study results can provide basis for the application of friction reduction drilling technique with hydraulic pulsed jet and the optimization of related tools.