Numerical Simulation And Test Study On Bottom Hole Flow Field In Particle Impact Drilling

In deep well drilling process,strong abrasive hard layer often encounter.When PDC bit drill this kind of layer,the bit drill slow and wear fast,making the drilling cost high.Particle impact drilling technology is a new type of drilling technology formed by adding steel particles to the drilling fluid to realize the erosion drilling on the basis of conventional rotary drilling and mechanical broking rock.PID bit is an important part of particle impact drilling system,PID bit structure design and research of particle impact,back to surface ability is one of the key to its technical research.In order to solve various kinds of problems in the field application of particle impact drilling technology,improve the drilling efficiency when drilling strong abrasive hard layer,in this paper,I use Fluent software and laboratory experimental conditions,combine numerical simulation method and indoor experiments method,from drill bit structure,nozzle structure,flow rate,spray distance,particle concentration,particle diameter and other angles,explore the flow pattern and the law of particle return in the bottom of the particle impact drilling,optimize the PID bit flow channel structure,nozzle structure and flow field parameters,explore the possibility of particle return.It can provide theoretical and experimental basis for field test of particle impact drilling technology.