Saudi Aramco's Zuluf offshore heavy oilfield has completed commissioning of its Phase I water treatment facility and officially entered trial operation. 

With Phase II expansion already awarded, the total treatment capacity will reach 308,000 m³/day, making it one of the largest formation water reinjection projects in the Middle East.

The core objective of this project is not discharge compliance, but the production of qualified reinjection water to maintain reservoir pressure and ensure stable production from the offshore field. 

The feedwater is high-salinity groundwater, and the process train includes degassing and recovery, clarification and sedimentation, fine filtration, and pressurized delivery. 

The high-salinity water quality places stringent demands on the salt tolerance of flocculation and clarification chemicals.

Many mature and offshore oilfields across the Middle East face a shortage of reinjection water resources, and similar large-scale water treatment infrastructure continues to be rolled out. 

Under high-salinity conditions, conventional polyacrylamide often suffers from reduced flocculation efficiency and loose floc formation. 

The selection of salt-tolerant flocculants has therefore become a key focus in the process design of such projects.