This article introduces a new approach to deep profile modification by selecting “bypass wells” or “infill wells” between injection and production wells for the placement of dam bodies. These wells are succinctly referred to as “barrier placement wells”. In the following text, they are abbreviated as “dam well” or ‘ZhiBa Well’. The principle involves injecting an optimized amount of plugging agent into the profile control layer of the “dam well” to achieve the placement of gel deep within the reservoir. This forms a “gel dam” or “water-blocking dam” in the preferential flow channels or areas of strong water washing, causing the injected water flow lines to redistribute throughout the entire reservoir space, redirecting the fluid flow. The study adopts a combined approach of laboratory experiments and numerical simulations. First, the study examines the effects of different “dam well” locations on the sweep efficiency in low-permeability and remaining oil enrichment areas through laboratory heterogeneous plate experiments. By comparing the recovery rate values of different “dam well” positions, the paper determines the reasonable choice of location for the 'dam well, and provide suggested parameters for the specific technical measures of the “dam well” construction. Next, the paper establishes a dynamic gelation model to accurately simulate the gel plugging dynamics. Finally, the paper conducts an optimization design of the actual “dam well” construction parameters (plugging radius) based on the streamline analysis results and the incremental oil production of numerical simulation. Research suggests that by setting up a “dam well” in high permeability channels between injection and production wells for deep profile control, it achieves the objective of redistributing the injection water streamline and redirecting the liquid flow throughout the whole reservoir space. On-site, the “dam well” is strategically positioned between half and a quarter well spacing from the injection and production ends. A numerical simulation system that accounts for gelation, aging and shear can simulate the actual plugging situation accurately. By setting up a “dam well”, the water flow of the original main streamline is essentially blocked, and the newly formed injection water streamline affects the remaining oil on the upper and lower wings of the original main streamline, playing an effective role in enhancing oil recovery. Considering factors such as incremental oil volume, chemical consumption, and operational duration, an optimal “dam well” radius is determined to be 25 m. The new deep profile control method introduced in this article has played a role in improving the development effect of thick oil layers and providing technical reserves for large-scale low-cost deep profile control.