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calcium carbonate

1. n. [Drilling Fluids]

A compound with formula CaCO3 that occurs naturally as limestone. Ground and sized calcium carbonate is used to increase mud density to about 12 lbm/galUS [1.44 kg/m3], and is preferable to barite because it is acid-soluble and can be dissolved with hydrochloric acid to clean up production zones. Its primary use today is as a bridging material in drill-in, completion, and workover fluids. Sized calcium carbonate particles, along with polymers, control fluid loss in brines or drill-in, completion, and workover fluids. Insoluble calcium carbonate is the precipitated by-product of mud treatments used for removal of either Ca+2 or CO3–2 by addition of the other ion.

See: alkalinitybicarbonatecarbonate ioncarboxymethylcellulosecompletion fluiddrill-in fluidGarrett Gas Trainhardness ionhydroxyethylcellulosepolyanionic cellulosepolymersized calcium carbonateweighting materialworkover fluid

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