Displacement fluid

We have been having some discussion about what fluid it's best to displace with on cement jobs with WBM in the hole. For casing pressure tests it is common to treat water as incompressible, although this is not strictly true. Does anybody have any insight into the compressibility effects that mud chemicals (non hydrocarbon based) and drill solids have? Do these reduce the compressibility, increase it or have a neutral effect?

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