Experimental Study on CO2 Flooding and Storage in Chang 8 Ultra-Low Permeability Reservoir in District Huang 3，Jiyuan Oilfield

doi:10.7657/XJPG20230511

Abstract

Abstract:

In order to determine CO₂ flooding and storage mechanisms in the ultra-low permeability reservoir in Jiyuan oilfield, long core experiments were performed to understand the performance of enhanced oil recovery (EOR) and CO₂ storage under different flooding techniques. The results show that the CO₂-water alternating injection after water flooding yields the highest recovery factor, followed by CO₂-water alternating flooding, while continuous CO₂ injection exhibits the lowest recovery factor. CO₂ breakthrough is a crucial factor influencing recovery factor, and alternating injection can suppress gas channeling. CO₂ is dominantly stored in the large pores of the reservoir, and the CO₂-water alternating flooding is more conducive to CO₂ storage in the small pores than pure CO₂ flooding. Continuous CO₂ injection, CO₂-water alternating flooding, CO₂-water alternating injection after water flooding, and CO₂ injection after water flooding exhibit a descending order in CO₂ storage efficiency.

Key words: Jiyuan oilfield, ultra-low permeability reservoir, CO₂ flooding, CO₂-water alternating flooding, recovery factor, CO₂ storage, core experiment, NMR

CLC Number:

TE348

CHEN Xiaodong, WANG Jin, SONG Peng, LIU Jian, YANG Weiguo, ZHANG Baojuan. Experimental Study on CO₂ Flooding and Storage in Chang 8 Ultra-Low Permeability Reservoir in District Huang 3，Jiyuan Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(5): 592-597.

Figures/Tables 7

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Experimental Study on CO₂ Flooding and Storage in Chang 8 Ultra-Low Permeability Reservoir in District Huang 3，Jiyuan Oilfield

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