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
的流体是一种瞬态流
，存在着压力行波，使从普通射出的流体有一定程度的
。
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的流体是一种瞬态流，存在着压力行波，使从普通射出的流体有一定程度的。
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