If you drill in formations that have a lot of bentonite , you may need to use lignosulfonate mud (freshwater lignite mud). Bentonite in the formations are easily dispersed by water and bentonite will increase dispersion viscosity and rheology . The lignite was added to the slurry water will control this problem and it is not expensive. Many people like to use this mud because it can be a weighting factor to nearly 19 PPG, but he still has very low value of low gravity solids .
You still have some drawbacks of this system. Lignosulfonate mud was not the stability of shale as other than low solids non-dispersed fluid mud PHPA, KCL base mud, and salt water system. In addition, certain additives such as carbonate can cause contamination in the mud and the mud properties deteriorate. You must be careful when using lignosulfonate mud with some chemical additives.
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