M-I SWACO offers a comprehensive portfolio of clear-brine fluids that are displaced in the well once the drilling phase has been completed. These completion fluids are designed to minimize formation damage and control reservoir formation pressures.

Our clear-brine completion fluids are typically prepared with soluble salts for density. These fluids are blended to certain specifications to take into consideration densities, 凝固点(TCT), 压力/温度凝固点, 和清晰.

Among our clear brine fluids are specially engineered formate and halide brine solutions.



We offer a variety of halide brines and brine blends that are formulated to meet project requirements. These fluids can be used for completion, workover, or packer fluid applications.

  • 氯化铵 (dry)—suitable for low-density operations and as a clay and shale inhibitor (using 2% to 4%) 
  • 溴化钙 (liquid or dry)—inhibits hydration and migration of swelling clays (also available as either a calcium bromide/calcium chloride or zinc bromide/calcium bromide blend)
  • 氯化钙 (liquid or dry)—reduces formation damage caused by solids or clay swelling, 粘土分散, 或者粘土和固体的迁移
  • 氯化钾 (liquid or dry)—stabilizes shale in water-sensitive clay and shale formation and clay-containing sandstones
  • 溴化钠 (liquid or dry)—eliminates potential of formation damage due to precipitation of carbonate, 碳酸氢, and sulfate compounds (also available as a sodium bromide/sodium chloride)
  • 氯化钠 (liquid or dry)—suitable for low-density operations such as shallow low-pressure wells that do not require the special inhibitive properties of calcium or potassium systems


Formate salts are extremely soluble in water and form high-density, solids-free brines—reducing the need for weighting agents. M-I SWACO has a long history of engineering formate-based brine systems for various global applications, and the following brines and blends thereof provide the basis for our latest breakthrough in fluids engineering:

  • 甲酸钠
  • 甲酸钾
  • 甲酸铯

These brine systems reduce potential formation damage, 是否有页岩稳定剂提供页岩稳定性, and eliminate problems associated with precipitate formation.