Produced Water Reuse in Waterflooding: Case Studies, Lessons Learned, and Future Pathways

Abstract

The petroleum industry faces mounting pressure to manage produced water sustainably, particularly in arid regions like the Middle East, where freshwater resources are scarce. Balancing environmental regulations, operational costs, and reservoir performance remains a key challenge, especially as waterflooding continues to be a dominant enhanced oil recovery (EOR) method. In this paper, a total of three methods were prescribed to address this issue targeting the produced water, first the treatment procedures of produced water for reinjection on the ground was introduced which was effective but adding more cost to the operator, second one was Downhole oil water separation and reinjection technology which proved to be valuable, third one was the downhole injection-production integration system which was suitable to the areas with enough underground water resources. The results indicated that produced water could be recycled and reinjected into reservoir, different approach should be implemented according to the field development stage. Treatment on the ground was the best but adding more labor and economic cost, as for the high water cut oil well, downhole separation and reinjection technology should be more preferred, as for the regions with rich underground water resources, the downhole injection-production integration system will help address the problem of water shortage provided the compatibility meets the requirement. Produced water reuse is an essential practice in the oil and gas industry, balancing economic production with environmental stewardship. As global energy demands evolve and sustainability pressures intensify, the technology is advancing toward greater efficiency, lower environmental impact, and improved integration with digital and circular economy principles.