Author(s)

XinRui Wang¹, RuHao Liu^2*

Affiliation(s)

¹School of Earth Science, Northeast Petroleum University, Daqing, 163318, China.

²Institute of Unconventional Oil and Gas Development, Chongqing University of Science and Technology, Chongqing 401331, China.

Corresponding Author

RuHao Liu

ABSTRACT

CO₂ 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 CO₂ 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.

KEYWORDS

CO₂ displacement; Numerical simulation; Tight reservoir; Volumetric fracturing

CITE THIS PAPER

XinRui Wang, RuHao Liu. Study on factors of CO₂ gas channeling. Eurasia Journal of Science and Technology. 2024, 6(5): 19-23. DOI: https://doi.org/10.61784/ejst3032.

REFERENCES

[1] Gao Huimei, He Ying, Zhou Xisheng. CO₂ injection to enhance oil recoveryTechnical research progress. Special Oil and Gas Reservoirs, 2009, 16 (1): 6-12.

[2] Zhou Yu, Wang Rui, Gou Feifei, et al. Mechanism of CO₂ flooding in high water cut reservoirs. Acta Petrolei Sinica, 2016, 37(1) : 143-150.

[3] Zhang Xing, Yang Shenglai, Wen Bo, et al. Experimental Study on starting pressure gradient of CO₂ miscible flooding in low permeability reservoir. Petroleum Geology & Experiment, 2013, 35(5): 583-586.

[4] He Jia, Zhou Xisheng, Li Min, et al. Study on CO₂ displacement injection method in ultra-low permeability reservoir. Journal of Oil and Gas Technology, 2010, 32(6): 131-134.

[5] Peng Songshui. Study on CO₂ displacement gas channeling in ultra-low permeability reservoir of Shengli Zhenglizhuang Oilfield. Journal of Oil and Gas Technology, 2013, 35(3): 147-149.