Structural Design and Numerical Simulation of Percussion PDM Drill

As China’s exploration and development efforts advance, oil extraction increasingly targets deep and ultra-deep wells. Deep formations feature high rock strength and poor drillability. Combining downhole motor drilling tools with impact drilling technology proves effective for enhancing speed in deep formations. To address this, an impact screw drilling tool was developed. It adds an impact drive shaft to conventional screw drilling tools. After discussing the tool’s structural principles, CFD flow field simulation was used to analyze flow velocity, pressure drop, and component strength of the impact screw. Ansys software was applied to verify the drive shaft’s strength. By calculating pressure differences across the flow field and considering the piston hammer’s structure and mass, the impact force was derived using the impulse theorem. This instantaneous impact force remains far below the drill bit’s rated load, meeting operational requirements without shortening the bit’s lifespan. Both stress and deformation of the impact screw drilling tool stay within safe limits. Critical components also show safe stress and deformation levels, confirming structural reliability. These findings provide references for optimizing impact screw tools and guiding field applications.