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Drilling fluids, the circulating fluid for drilling operations, is a mixture of the fluid, the solid and chemical agents. It is usually known as the “mud” or the “blood of drilling” deriving from its distinctive significance.
The solid in mud primarily includes concocting clay, weighting materials, drill cuttings and other solid substances. In terms of sources, it then comprises concocting clay, debris, weighting materials, solids from agents, etc.
Besides, different types of action of solids and ions in water can further categorize low-density solids into active and inert ones.