As oilfield development enters the late stage of extra-high water cut, the multi-layer production mode exacerbates the interlayer contradiction, and the utilization degree of thin and poor layers is seriously insufficient. Block X, as a typical high-water-cut oilfield, has experienced formation energy depletion due to the large-area standard layer casing damage, the formation pressure has been lower than the development requirements for a long time. In view of the problems such as severe formation energy depletion, unbalanced reservoir utilization, and serious reservoir pollution in Block X after the layer system recombination, this study takes optimized water injection adjustment as the core and comprehensively applies a series of technical countermeasures, including the matching adjustment of new and old water injection wells, the refined design of layered schemes, the strengthening of water injection well measure modification, and the application of intelligent measurement and adjustment separate injection technology. These measures have effectively improved the water flooding development effect. Field application results show that this technical system has significantly controlled production decline, slowed down the water cut increase rate, improved the reservoir utilization status, and restored formation energy, providing an important reference for the development and adjustment of similar reservoirs.