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的
是一种瞬态动，存在着压力行波，使从普通喷嘴射出的有一定程度的
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的是一种瞬态动，存在着压力行波，使从普通喷嘴射出的有一定程度的动。
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