Abstract: Reservoir water is a common component of oil and gas reservoirs. Water content may be anything from a few percent to a near-complete absence of dry space. Oil and gas reservoir fluids are a complex combination of both organic and inorganic components with a genetic link to the oil they contain. The mineral salts in these fluids come from the sea, therefore you may expect to find elements like sodium, potassium, calcium, magnesium, chloride, bicarbonate, and sulfate. In order to prevent contamination of the environment, particularly waterways, produced water must undergo a certain treatment before disposal. Limescale, a byproduct of the mineral content of these waters, may lead to malfunctions in machinery like injection pumps and the rusting of metal components.