Optimization design of injection parameters for ASP flooding in Block D

Abstract The reservoir conditions in Block D are poor, with a high proportion of reserves in thin reservoirs and a low drilling rate of channel sand. To more accurately match the design of chemical flooding parameters for Class II and III reservoirs and improve the fitting accuracy, the inaccessible pore volume, residual resistance factor, and other key parameters are modified, the surfactant concentration is optimized, and the chemical flooding slug dosage for Class II and III reservoirs is determined. Additionally, the research on reservoir connectivity between wells and factors affecting injection capacity has been carried out, the classification and discrimination method of well groups with injection capacity has been established, and the injection concentration range of well areas with different injection capacities has been determined, which has a certain guiding significance for the later design and adjustment of similar block schemes.