Azar Oilfield presents some of the most complex and challenging drilling operations in the region, requiring precise engineering and operational calculations. Major challenges include designing casings due to varying formation pressures, the necessity of using heavy drilling fluids (83-148 Pcf) with alternating low and high-pressure zones, heavy casing strings (approaching rig capacity), long open-hole intervals, high H₂S content, and remnants of unexploded mines from the 1980s war.
Another significant issue was high-volume acidization (combined), a technique where acid is injected into the formation under fracture pressure to remove formation shells and enhance reservoir-well connectivity. To improve well productivity, SAED performed high-volume mixed and selective acidization in Azar Oilfield wells. In mixed acidization, chemical diverters such as Viscoelastic Diversion Acid (VDA) are used to direct acid treatment toward low-permeability zones. In selective acidization, recoverable plugs or air drilling are employed to isolate specific formation sections. The results of these high-volume acid stimulations have successfully increased the wells' productivity index and overall production from the Azar Oilfield.