How to determine whether to change drilling fluids

How to determine if the drilling fluid needs to be replaced or treated:

Excessive change in density: too high a density will increase the load on the drilling pump and even cause damage to the drilling rig; too low a density may lead to a blowout.
High or low viscosity: High viscosity affects the fluidity of the mud and the ability to carry rock cuttings; low viscosity does not effectively stabilize the well wall.
High water loss rate: High water loss rate will lead to thick mud cake, which will affect the drilling efficiency.
Large amounts of cuttings or impurities in the mud: This affects the performance of the mud and can cause the bit to clog.

Deterioration or contamination of the mud: For example, the mud has settled, fermented or become contaminated with chemicals.

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