Fluid is conveied to bit nozzel through drill string from pump is a transient state flowing with pressure wave, which makes the fluid jetted out from nozzel has certain pulsation.
从钻井泵经过钻柱内部输送到钻头喷嘴
流体
瞬态流
，存在着压力行波，使从普通喷嘴射出流体有定程度
。
搏;悸
;；压力冲Fluid is conveied to bit nozzel through drill string from pump is a transient state flowing with pressure wave, which makes the fluid jetted out from nozzel has certain pulsation.
从钻井泵经过钻柱内部输送到钻头喷嘴流体瞬态流，存在着压力行波，使从普通喷嘴射出流体有定程度。
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