Downhole scale and corrosion mitigation

A method for delivering inhibitor fluid downhole within a subterranean well, the method including:

• suspending an injection tool within a central bore of a production tubular of the subterranean well with a support member that extends through a central bore of the production tubular, the injection tool having an injection tool body that is an elongated member with an interior storage space, the interior storage space sized to contain a sufficient amount of inhibitor fluid for treating a produced fluid, and where the production tubular delivers the produced fluid to the surface;
• positioning the injection tool within the subterranean well such that the water sensor is located at a production fluid entrance to the production tubular;
• sensing an amount of water within the subterranean well with a water sensor of the injection tool;
• moving an injector valve between a closed position where the inhibitor fluid located within the interior storage space is prevented from exiting the interior storage space past the injector valve, and an open position where the injector valve provides a fluid flow path for the inhibitor fluid located within the interior storage space to exit the interior storage space through the injector valve;
• and
• refilling the interior storage space of the injection tool with inhibitor fluid by way of a refill line extending from an inhibitor fluid storage tank to the interior storage space.