A compound with formula CaCO3that occurs naturally as a limestone. Ground and size calcium carbonate is use to increase mud density and is preferable to barite because it is acid-soluble and can be dissolved with hydrochloride acid to clean up as a binding material in drill-in completion and workover fluid.
Calcium carbonate is used to prevent fluid invasion of permeable zone, and to prevent loss of circulation during during drilling workover and completion activities.
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