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calcium chloride

1. n. [Drilling Fluids]

A highly soluble calcium salt of formula CaCl2 used to make drilling and workover fluids or brines with a density range from 8.33 to 11.6 lbm/galUS [1.39 g/cm3] at saturation. CaCl2 can be blended with other brines, including sodium chloride [NaCl], calcium bromide [CaBr2], and zinc bromide [ZnBr2]. Emulsification of CaCl2 brine as the internal phase of oil-based or synthetic-based mud is an important use because the brine provides osmotic wellbore stability while drilling water-sensitive shale zones.

See: activity of aqueous solutionsbalanced-activity oil mudcalcium muddrilling fluidemulsionhygroscopicoil mudosmosisworkover fluid

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