关键词: 喷射钻井, 自激振荡, 射流, 喷嘴

Abstract: A new drill bit nozzle is presented in this paper with respect to the principle of oscillation, physical and mathematical models and the results of in-house and field tests.Addition of such a nozzle can generate strong pressure oscillation to enhance bottom hole hydrodynamic force, pressure gradient and well bore pressure potential,resulting in rock fracturing and bottom clean-up. Under the same operating conditions, the penetration rate can be increased by 35.5-77%, the bit footage by 6-44%.