泥浆的主要功用之一是通过自身的循环，有效地清除钻孔内破碎下来的岩屑，特别是对于水平孔，可以避免砂床的形成，减少钻孔内的事故。
Drilling mud can clean out the cuttings by its circulation, especially for horizontal hole, it can avoid the sand-bed formation and reduce downhole troubles.
阐述了岩屑从钻孔排出的收集过程与有关设备，岩屑定量分析值的计算，并举例说明岩屑的代表性。
Process of collecting chip sample returned from drill hole, the related equipment, formula of calculating average assay of core and chip, as well as representativeness of chip are discussed.
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