Numerical Simulation of the Bottom Hole Flow Field of Particle Impact Drilling

摘要

It is very difficult to obtain the bottom hole fluid field of particle impact drilling though theoretical and experimental method. A method of numerical simulation was used to study the bottom hole fluid field of particle impact drilling, and it has been proved a good way to interpret particle impact process. The numerical model and computing method was used for solve the problem. It was predicted that five fluid areas were in the bottom hole fluid field by the simulation results. The changed law of the bottom hole pressure field and velocity field by altering different parameter was worked out, and the motion curve of the particles was also obtained. The result of the numerical simulation can provided more material for increasing the efficiency of particle impact and optimizing the bottom hole fluid field of particle impact drilling.