Technology of Water Injection Development in Ultra-Low Permeability Reservoir

Abstract

Abstract In order to further explore the technology of water injection development in ultra-low permeability reservoir, the Chang 6 reservoir in S area is taken as an example in this study to analyze the characteristics of single-phase seepage, dual-phase seepage, and water injection development in ultra-low permeability reservoir. The experimental results show that the reservoir has poor physical properties and complex pore structure. The flow of single-phase oil/water in the reservoir is non-Darcy flow; it restricts each other for the dual-phase flow, which seriously affects the effective flow capacity, resulting in high injection resistance. It is found based on the water injection experiment that the initial mining degree is relatively high, and the average water driver recovery factor in the core of ultra-low permeability sandstone is 49.9%, and the physical properties have no direct impact on the recovery level. Therefore, the technology of water injection development has certain feasibility and rationality in the exploitation of ultra-low permeability reservoir, and can be used in the practical exploitation.