STUDY ON FACTORS OF CO2 GAS CHANNELING

Abstract

CO 2 flooding has certain development prospects in improving recovery efficiency of low permeability reservoir, but there are some problems such as gas channeling, poor gas injection development effect, and low understanding of influencing factors of gas channeling. As an injection well in the study area W20, gas discovery occurs in nearby Wells, resulting in increased pressure and decreased oil production. The factors of CO 2 gas channeling are analyzed from the aspects of sand body distribution, microfacies type, reservoir heterogeneity and fracture development scale. The law is verified according to the actual work area. The research shows that the distribution of sand body is the main gas channeling channel, and different microfacies types have different gas channeling capabilities. The vertical heterogeneity of the reservoir controls the gas channeling capability inside the sand body, and the development of fractures controls the gas distribution. The research results provide a theoretical basis for the selection of gas injection Wells and the improvement of gas injection development results.