The most common oil field scales are listed in Table 1,
along with the primary variables that affect their solubility
[1]. These scales are sulfates such as calcium sulfate (anhydrite,
gypsum), barium sulfate (barite), Strontium sulfate
(celestite) and calcium carbonate. Other less common scales
have also been reported such as iron oxides, iron sulfides and
iron carbonate. Lead and zinc sulfide scale has recently become
a concern in a number of North Sea oil and gas fields
[2].