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
流体是一种瞬态流动，存在着压力行波，使从普通喷嘴射出流体有一定程度
动。
搏;悸动;动动；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是一种瞬态流动，存在着压力行波，使从普通喷嘴射出流体有一定程度动。
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