NOZZLE FOR SELF-EXCITED OSCILLATIONS OF DRILLING MUD AND DRILLING TOOL WITH THIS NOZZLE Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: nozzle can be used in tricone drilling bit or monolithic bit for delivery of pulsating jets of thixotropic drilling mud during operations of drilling. Nozzle is provided with inlet hole communicating with inner space, and outlet hole. Dimensions of holes are selected so as to cause cyclic distribution of disturbing force at shear boundary formed between drilling mud passing directly through nozzle and drilling mud which is momentarily caught by space and by this leading to creation of self-excited oscillating flow of aforesaid drilling mud inside nozzle and to forming of pulsing jet discharged from nozzle. EFFECT: high efficiency. 22 cl, 6 dwg