Design and flow field analysis of impregnated diamond bit for seafloor drill in soft-hard interlaced strata

Abstract According to the seafloor drill working conditions and complex formation characteristics of seafloor, this paper aims improve adaptability diamond bit coring quality. The cutter tooth design scheme impregnated is proposed, Fluent analyzes flow field drilling fluid at bottom hole. results show that cone cutting with primary assistant nozzles can directly avoid 85.33% flushing core reduce disturbance samples. water passage structure reasonable, upward return velocity be stabilized between 0.7 1.8 m/s, which meets requirements cuttings in seabed strata, has a good hole wall protection performance. Based on bottom-jet bit, are added. better cover crown, conductive cooling crown. main timely up-return along outer annulus wall, conducive fluid. This study extend existing designs bits analysis methods.