Determining the effect of mineral scaling formation under different injection water sources on the performance of Mishrif carbonate reservoir in Halfaya oilfield, Southern Iraq

Abstract The chief source of the oilfield scale is mixing incompatible waters. This study demonstrated that reservoir Mishrif formation (Halfaya oilfield) with six types injection water sources, including Tigris River water, producing formation, Gulf seawater, Marshes Middle Kirkuk and Main Outfall Drain (AL-Masab AL-Aam Channel), leads to salt crusts cause reduction rock permeability. According Piper diagram, all extant samples was sodium chloride type (NaCl), except for HF-81, which between (NaCl) mix (CaMgCl) type. A geochemical simulation model alignment (PHREEQC) used simulate this problem, it revealed mineral scaling from processes. These minerals precipitate in pores clog them, then damage petrophysical properties prevent passage liquids. Results showed best are followed by general downstream, but treatment before needed. modeling method can help better understand issues efficiently identifying various selected lowest possible cost, turn improves oil production.