The laying position and well blowout pressure are analyzed and discussed briefly and the relationship curve of drill bit pressure drop vs flowrate and fluid density i.
对其安放位置及井喷压力进行了简要分析和探讨，建立了钻头压降与流量、流体密度的关系曲线。
A pressure drop through the bit maintains the tool in the open position while the return springs close the pistons when flow decreases.
随后钻头处的压力降使扩眼工具处于打开状态，当流速下降时弹簧将活塞收回至原处。
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