Waterflooding system and process to prevent scale precipitation in oil fields

A system for targeted waterflooding in an oil field, comprising:

• a target area in the oil field, the target area having a plurality of injection wells located at the periphery of a plurality of production wells in a peripheral injection pattern;
• a plurality of mobile reverse osmosis units positioned at various locations of the target area, each mobile reverse osmosis unit connected with source water,
• wherein each mobile reverse osmosis unit generates fresh water from the source water, the fresh water having a salinity lower than the source water;
• and
• an injection manifold connected with the plurality of mobile reverse osmosis units,
• wherein the injection manifold distributes the fresh water from each mobile reverse osmosis unit into the plurality of injection wells, creating an underground buffer zone of a diluted formation brine that dilutes a formation brine at the periphery of each the plurality of production wells,
• wherein the fresh water is stored in the underground buffer zone prior to use in the plurality of production wells, and
• wherein the underground buffer zone is arranged at the periphery of the formation brine such that the underground buffer zone encircles the formation brine.