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Oil and Gas

Produced from high quality natural ores at 8 facilities in North America, Carmeuse’s milled limestone products are used in a variety of industrial applications offering affordable and versatile solutions including use in the oil and gas industry.

Milled limestone is one of the most versatile minerals used in the oil & gas industry today.  Because of its high specific gravity along with its acid solubility, it is a preferred component in the following drilling fluid applications

Reservoir Drilling Fluids or “drill-in” fluids
Milled limestone is added to:

  • form a “bridge” or “filter cake” over formation pores
  • prevent migration of particles into the reservoir
  • removed with acid or chelant at a later stage


Lost Circulation Fluid

  • Milled limestone builds a filter cake at the entrance of the fracture to seal it up


Acid-Soluble Cement

  • Milled limestone is a component of the cement
  • After frac’ing, broken cement pieces plug casing holes
  • Pump acid into casing to dissolve the limestone in the cement pieces


  • Milled or screened
  • Limestone or marble
  • High specific gravity (Relative Density)
  • Particle size distribution designed for optimum particle packing
  • Acid soluble
  • Readily available


  • Densifies drilling fluid
  • Controls circulation loss
  • Prevents formation damage


  • Safe
  • Cost effective
  • Versatile
  • Environmentally friendly

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