Lime and slaked lime are all common names for calcium hydroxide Ca(OH)2. It is used as a source of calcium and alkalinity in both water-base and oil-base drilling fluid. Lime is a widely available commercial chemical, is an economical source of calcium and hydroxyl ions.
Applications/Functions
Increases pH
Provides excess lime as an alkalinity buffer
Flocculates bentonite muds
Removes soluble carbonates from water-base muds
Controls corrosion
Activates certain oil-mud emulsifiers
Advantages
Widely available economical source of calcium and alkalinity
Increases the pH to control pipe corrosion
Typical Properties
Appearance: White powder
Solubility in water: 0.07-0.19% by weight
Specific gravity: 2.3
Recommended Treatment
Lime is added as required to maintain the alkalinity properties of lime muds
Although Lime can remove soluble carbonates, it should not be used where an increase in the mud pH is not desired or if the pH of the mud is already greater than 11
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