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In order to improve the reverse circulation(RC) pumping performance and enhance the effect of RC, the suction-type RC bit on the basis of ejection theory was designed. And with theoretical calculations, computational fluid dynamics(CFD) and experiment, pressure field and velocity field produced by different angle inner nozzles were studied. It was discussed(More)
Abrasive water jet can be applied to perforate the oil formation rock. The perforation depth generated by abrasive water jet is nonlinearly influenced by so many factors that it is difficult to mathematically correlate the perforation depth with influencing factors. So the back propagation (BP) neural network is introduced to establish the model for(More)
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