Wellbore steam injector

Disclosed are systems and methods of injecting steam into a wellbore. One disclosed injection tool includes a body defining an inner bore and a radial flow channel, one or more fluid conduits defined in the body at the radial flow channel, a shroud arranged about the body such that an annulus is defined and in fluid communication with the one or more fluid conduits and the surrounding wellbore environment, a sleeve arranged within inner bore and movable between a first position, where the sleeve occludes the one or more fluid conduits, and a second position, where the one or more fluid conduits are exposed, and first and second seals generated at opposing axial ends of the radial flow channel when the sleeve is in the first position.