The complications, the organizational stopwork and the troubles in drilling operation are the three important elements composing drilling non-productive times.
复杂情况、组织停工、钻井事故是构成钻井非生产时间的三个主要因素。
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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