THE sun is out, the sand gleaming white, the waves rolling toward shore in clean, regular sets.

太阳出来了，沙滩闪着白光，波浪有节奏地拍打着海岸。

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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.

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。

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