Oyster-Shell F/M/C


Appearance Off-white to gray granules
Specific Gravity 2.6-2.8
Solubility Insoluble in wate, oil & alcohol
Solubility in 15% HCL Min 97%


Oyster-Shell F/M/C is a drilling fluid which is mostly composed of CaCO3.  Oyster-Shell F/M/C are used in drilling fluid industry as loss circulation material which can be used in productive formations due to its high solubility in HCl acid. Oyster-Shell is available in three size grades (fine, medium and coarse) and can be applied in different types of drilling fluids.


  • Effective LCM material
  • Can be applied as a mixture with other types of LCMs such asCALCIUM CARBONATE F/M/C
  • Applicable in fractured and vugular loss zones
  • Environmentally benign.
  • Compatible with both water-based and oil-based mud systems
  • High acid solubility
  • Wide particle size for optimizing the fractures with different widths
  • Compatible with all salts
  • Applicable in different range of pH (7 to 11)


  • Lost Circulation Material in Oil-based and Water-based muds
  • Applicable in thief zones to minimize downhole loss
  • Suitable for both reservoir and non-reservoir formation

Safety tips

Eye Contact: Check for and remove any contact lenses. In case of contact, immediately flush eyes with plenty of water for at least 15 minutes. Skin Contact: Wash with soap and water. Cover the irritated skin with an emollient. Get medical attention if irritation develops. Inhalation: If dust is inhaled, remove from contaminated area. - Encourage patient to blow nose to ensure clear passage of breathing. Ingestion: - Immediately give a glass of water. - First aid is not generally required. If in doubt, contact a Poisons Information Centre or a doctor For more information please refer to Oyster-Shell F/M/C Material Safety Datasheet.