Numerical Simulation On The Bottom Hole Flow Field Of Particle Impact Drilling

Particle Impact Drilling Technology (PID for short) is a new drilling technology that can obviously improve the speed of deep drilling in hard formation. U.S. PDTI (Particle Drilling Technology Inc.) has conducted essential research and field application tests. At present, this technology has been relatively mature, but the issue of optimal design of the bottom hole flow field still requires further study. In this paper, our study to the bottom hole flow field mainly by numerical simulation, and through experiment for verification. Create physical model of PID bit used by Gambit, and mesh the physical model with the block-structured grid skill. Assuming the bit is stationary, the bottom hole flow field was simulated used Fluent. The standard k-εmodel and stand wall functions were adopted. Choose velocity-inlet and outflow for model's boundary conditions. Simulation content including:(1)Study the velocity and pressure distribution rule of the bottom flow field when the bit is stationary.(2)Get the law of the bottom flow field change affected by the change of distance, angle and pressure, and analysis the reason of the change.(3)Get and analysis the track of the particles using discrete phase model.At last, check the law getting from Numerical simulation by indoor experiment in order to prove the correctness of the Numerical simulation. The study have great engineering signification in PID bit's structure optimization.