Stimulation / Iron Control Agents

If the formation to be acidised contains significant quantities of soluble ferric iron (Fe3+) as opposed to ferrous (Fe2+), solids can be precipitated as the acid spends. Ferric iron precipitates at about pH 2.2, ferrous at about 7, so as 'spent' acid rarely reaches a pH of more than 6, precipitation of ferrous iron is seldom a problem. The gelatinous precipitate of ferric hydroxide can cause a reduction in permeability in the well, in some cases to below that of the well before treatment. This precipitation can be prevented by the use of complexing or sequestering materials.

View Iron Control Agents Informations Sheets
SFS-01 to SFS-05 Unlike SFS-01, 03 and 04, which complex the iron ions, SFS-05 reduces the ferric iron to the more soluble ferrous form, thus preventing the precipitation of ferric hydroxide from spent acid.	SFS-01/05
SFS-06 controls the pH of the spending acid to help prevent the precipitation of the iron in solution in the acid.	SFS-06