Chelating Agent

Definition - What does Chelating Agent mean?

A Chelating Agent, also known as a chelant or chelator, is a chemical compound that reacts with metal ions to form stable, water-soluble metal complexes. The agent rearranges the metal's chemical composition and improves the metal's general stability and the likelihood to bond with other substances. Chelating agents are used in several applications, including:

  • Oilfield applications and well workover, completion applications
  • Medical
  • Scale removal
  • Water treatment
  • Corrosion control

Petropedia explains Chelating Agent

Chelating agents are used in the oil and gas industry when any well workover and intervention processes are performed. These chemical chelating agents are used to bind the metallic ions and form a ring-like structure. There are various purposes for which chelating agents are used in an oilfield such as:

  • They help in stabilizing and preventing the precipitation of damaging compounds by keeping ions in a soluble form.
  • They help in cleaning the facility surface.
  • They help in removing scaling agents from the reservoir drilling fluids.
  • They help in breaking down, isolating or moving heavy metal ions.
  • They act as corrosion inhibitors to form insoluble surface chelates.

The following are some of the types of chelating agents used in oilfield applications:

  • Ethylenediamine tetraacetic acid (EDTA)
  • hydroxyethylenediamine triacetic acid (HEDTA)
  • Nitriolotriacetic acid (NTA)
  • Citric Acid
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