Study on gas injection development effect of tight reservoir based on fluid occurrence state

Based on the tight oil reservoir conditions of Lucaogou Formation in Jimusar Sag, Xinjiang, this paper conducts a full-scale characterization experiment pore structure and designs optimization numerical simulation development scheme based geological model combination with fluid occurrence state. A comparative study methods reservoirs shows that enhanced recovery effect CO 2 flooding is obviously better than CH 4 water flooding. When production bottom hole pressure lower formation saturation pressure, changing has little impact productivity reservoirs. The factor increases increase injection rate, but when rate higher 15,000 m³/d, change decrease obviously; complex fractures near well can help to swept volume flooding, while far away from will cause channeling, which not conducive production. Combined state fluid, it obtained process displacement, adsorption considered, components are same, capacity, decreases; capacity constant, proportion heavy is, is; With permeability decreases more. very different conventional reservoirs, phase accounts for larger proportion, seriously affects flow during process. However, rarely considers influence