粘度是泥浆流动难易的程度的指标。泥浆粘度的大小,决定于固体与液体的比例和粘土的质量。粘度大的泥浆在裂隙地层能防止泥浆漏失,使岩粉不易下沉。但在正常钻进时,粘度过大会引起循环困难,阻力大,水泵不易输送,钻进时钻头易产生泥包现象,清除岩粉困难;在钻粒钻进时,钻粒不易下达孔底。粘度可用野外标准粘度计测定,在漏斗体的 Viscosity is an indicator of the degree to which mud flows easily. The size of the mud viscosity depends on the solid to liquid ratio and clay quality. Viscous mud in the fissured formation to prevent mud loss, so that rock hard to sink. However, during normal drilling, the viscosity is too large, causing circulation problems, large resistance, the pump is not easy to transport, easy to produce when the drill bit mud phenomenon, clear rock powder difficult; drilling in the drilling, the drill is not easy to release the bottom of the hole. Viscosity can be measured with a field standard viscometer in the funnel