该术语通常是指钢的小碎片，如手工具、小零件、钻头喷嘴等，也可能是指钻头碎片或其它井下工具的碎片，以及磨铣作业所产生的残留物等。
The term is usually reserved for small pieces of steel such as hand tools, small parts, bit nozzles, pieces of bits or other downhole tools, and remnants of milling operations.
侧喷嘴倾斜角度在0度、30度、45度和60度情况下，由于井底涡旋器的旋流作用，导致井底产生旋转，对钻头喷嘴射流产生了影响，以致在45度时出现压力损失最小的情况；
When the inclination angle of a side nozzle is 0, 30,45 and 60 degrees, the eddying flow of the bottom hole vortex device will cause rotation at the bottom hole, affecting on the jet from bit nozzles.
通过大量的现场试验，得出三牙轮钻头三喷嘴优化组合的经验比值。
The experiential ratio of optimum combination of three nozzles on tri cone bit is obtained based on many field experiments.
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